Vertical Floor Models AVS, AVV, AVB, and AVRHorizontal Ceiling Models AHF, AHB, AHV, and AHR
Before beginning installation, please read this publication in its entirety.Develop a thorough understanding before starting the installation procedure.
This manual is to be used by the installer as a guide. Each installation is unique, only general topics are covered.The order in which topics are covered may not be those required for the actual installation.
IMPORTANT!
2 IM 725 (1-02)
Table of ContentsSafety Information and Tools Required ............................................................ 2Pre-Installation Considerations ......................................................................... 2Wall Openings, Louvers, and VentiMatic Shutter ............................................ 3Installing Louvers .............................................................................................. 7Installing the VentiMatic Shutter Assembly ...................................................... 8Installing The AV Unit Ventilator .............................................................. 9Step 1 - Uncrate and Inspect the Unit Ventilator(s) .......................................... 9Model AV Data Plate - Specific Information ................................................... 10Step 2 - Position the Unit Ventilator ............................................................ 11-12Step 3 - Make Piping Connections .................................................................. 12In All Systems .................................................................................................. 12In Water Systems ............................................................................................ 13Coil Header, Locations ............................................................................... 14-16
Valves and Piping (diagrams and dimensions) ......................................... 17-192-Way and 3-Way End of Cycle Valves ..................................................... 172-Way and 3-Way Modulating Valves ........................................................ 18End of Cycle (In Steam Systems) Valve Piping ........................................ 19
Unit Ventilator Split Systems Guidelines (DX) Systems ........................... 23-25Step 4 - Make Electrical Connections .............................................................. 26Unit Mounted MicroTech™ Direct Digital Controls (DDC) Components .... 27-28Typical Wall Mounted Room Air Sensor ......................................................... 29Step 5 - Prepare AV Unit Ventilator for Start-up ............................................. 30Installing Unit Ventilator End Panels .............................................................. 30Oiling the Fan Shaft Bearing ........................................................................... 30AV Unit Ventilator Start-Up ............................................................................. 30Model AH Ceiling Unit Installation .......................................................... 31Safety Information and Tools Required .......................................................... 31Model AH Data Plate - Specific Information ................................................... 32Typical Ceiling AH Unit Air Arrangements ................................................ 33-34Pre-Installation Condsiderations ..................................................................... 34Duct System Design for Noise Control ...................................................... 35-36Anchoring The Ceiling Unit ............................................................................. 36Filters ............................................................................................................... 37Same End Piping Connections ....................................................................... 37Remote Two Speed Control Switch ................................................................ 38Prepare AH Ceiling Unit Ventilator for Start-up ............................................. 39Installing AH Unit Ventilator End Panels ........................................................ 39Check, Test and Start Warranty Notice .......................................................... 39Warranty .......................................................................................................... 39
Tools RequiredA forklift or other lifting device is needed to install this product. Applicable tools for lifting, hook-up of piping, electrical and insulation. Unit comeswith an allen wrench and four (4) lagging washers in the envelope in end compartment of the unit. (see photo below)Install this product in accordance with good engineering practices and workmanship, following these general instructions, plus the job-specificAAF®-HermanNelson® submittal drawings provided for specific dimensions, unit arrangements, controls and electrical details, pipe stub-uplocations, etc.
Pre-Installation ConsiderationsStorage – If equipment is stored for any length of time before installation, it should remain in its shipping packaging in a clean, dry, climatecontrolled area.
Safety InformationFollow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for brazing operations. Have a fire extinguisher available. Follow all warnings andcautions in these instructions and attached to the unit. Consult applicable local building codes and National Electrical Codes (NEC) for special requirements.
Recognize safety information. When you see a safety symbol on the unit or in these instructions, be alert to the potential for personal injury. Understand the meaningsof the words DANGER, WARNING, and CAUTION. DANGER identifies the most serious hazards that will result in death or severe personal injury; WARNING meansthe hazards can result in death or severe personal injury; CAUTION identifies unsafe practices that can result in personal injury or product and property damage.
Improper installation, adjustment, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may result in personal injury orproperty damage. This product must be installed only by personnel with the training, experience, skills, and applicable licensing that makes him/her “a qualifiedprofessional HVACR installer.”
DISCONNECT ALL ELECTRICALPOWER BEFORE SERVICING UNITTO PREVENT INJURY OR DEATHDUE TO ELECTRICAL SHOCK.
WARNINGHAZARDOUS VOLTAGE!DISCONNECT ALL ELECTRIC POWER IN-CLUDING REMOTE DISCONNECTS BEFORESERVICING. FAILURE TO DISCONNECTPOWER BEFORE SERVICING CAN CAUSESEVERE PERSONAL INJURY OR DEATH.
! CAUTIONUSE COPPER CONDUCTORS ONLY.UNIT TERMINALS ARE NOT DESIGNED TOACCEPT OTHER TYPES OF CONDUCTORS.FAILURE TO DO SO MAY CAUSE DAMAGETO THE EQUIPMENT.
!
Forklift lifting location(see Caution above and table 2, page11 for unit weights)
Shipping Envelope Contents - Located inright end compartment of unit.
CAUTION!
Use 72" length forklift tines, short tines will damage the unitbottom.
! DANGER
IM 725 (1-02) 3
Figure 1 – Typical Classroom Unit Ventilator Installation And Louver Details (see installation section for typical warnings and cautions)
Figure 2 – Typical VentiMatic™ Shutter Assembly Installation (see installation section for typical warnings and cautions)
������������������������Unit Gasket
Pipe Tunnel
Lag Screws (By Others)
Weep Holes
Caulk Top AndTwo Sides Of Louver
Sealed Mortar Bed
Caulk
WeepHoles
Floor
Unit Insulating Blanket
Back Of Unit
Unit Bottom Gasket
Seal Under Unit
BirdScreen
Internal Column ForWall Bracing(By Others)
Caulk(top and 2 Sides)
Louvers
Drain Holes(Do Not Block)
Flange(4 Sides)
1" Minimum
Lintels (By Others)
Bird Screen
Sealed Cement MortarPitched Away from UnitToward Louver
Vertical or Horizontal Blade Wall IntakeLouver (Flanged)(Vertical Blade Shown)
Bird ScreenSealed CementMortar PitchedAway from UnitToward Louver
1" Minimum
Vertical or Horizontal Blade Wall Intake Louver(Recessed Without Flange)(Horizontal Blade Shown)
Lintels (By Others)
Louvers
Unit Gasket
Louver
Unit VentilatorOutdoor Air Opening
Outside
Roomside
See figure 1 for typical louver installation
Outside
Roomside
VentiMatic Shutter
Unit Outside Air Opening
Wall Openings, Louvers, and VentiMatic ShutterPrior to unit installation, be sure that the exterior wall openings and louvers, as applicable,are ready and in accordance with the job plans.Vertical Floor Models AVS, AVV, AVB, AVR are typically installed in front of a wallopening containing a properly sized louver that is designed to let in outside air whilepreventing water (such as driving rain) from getting past the louver and into the unit itself.A weather-tight seal keeps unwanted air and moisture from entering the occupied space.See Figures 1 through 18, and table 1 for various louver details.
Building Wall
4 IM 725 (1-02)
Figure 3 – Horizontal and Vertical Blade Louvers, Without Flange
Figure 4 – Horizontal and Vertical Blade Louvers, Without Flanges With Grille or With Flange Without Grille
Louver drain lipGrille/Louver with weep hole
Vertical Blade LouverHorizontal Blade Louver
Flange
Flange
Outside Air
Outside Air
Outside Air
Bird Screen On Side Toward Unit
Vertical Louver with Flange,without Grille
Horizontal Louver withoutFlange, with Grille
CAUTION!
Locate Weep Hole or Drain Lip at bottom of louver to allowproper drainage.
IM 725 (1-02) 5
Figure 6 -165⁄8" (422mm) Deep Unit with Open Pipe Tunnel & High LouverApplication with Chased Wall
1"(25mm)
Sealed CementMortar;Pitch AwayFrom Unit
Louver
Lintel(By Others)
Floor Line
Piping
Louver
Not LessThan 3" (76mm)
Not MoreThan 21" (533mm)
Sealed CementMortar;Pitch AwayFrom Unit
Piping
Floor Line
Figure 5 - The 165/8” (422mm) Deep Unit with Open Pipe Tunnel and StandardLouver Location
Louver Installation With Typical Unit Configurations
Unit Configuration Type AL
1"(25mm)
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Lintel(By Others)
Figure 7 - Above Floor Level Outdoor Air Intake Using Arrangement AV or ALWith Accessory Closed Pipe Tunnel
Piping
Floor Line
Lintel (By Others)
Intake Louver
Not Less Than 3"
Not MoreThan 28"
Insulated ClosurePlate Accessory
ProvideDrainage
1"(25mm)
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Figure 8 - Floor Level Outdoor Air Intake With Window Below Unit Top UsingArrangement AL And 9˝ “Finished” (Painted) Accessory (Uninsulated) ClosedPipe Tunnel
Unit Configuration Type AL
Lintel (By Others)
Intake Louver
Sealed CementMortar;Pitch AwayFrom Unit Sealed Cement
Mortar;Pitch AwayFrom Unit
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Sash Piping
1"(25mm)
Painted Insulated Closure Plate Accessory
Floor Line
ProvideDrainage
Gasket Seal Gasket Seal
Gasket Seal
Accumulated moisture can cause property damage if notproperly drained. Installing contractor must provide suchdrainage.
CAUTION!
6 IM 725 (1-02)
Figure 11 – The 217/8” (556mm) Deep Full Adapter Back Unit with Closed PipeTunnel, Ducted with Top Intake
Figure 12 – 217/8" (556mm) Deep Partial Adapter Back Unit with Open PipeTunnel
Intake Louver
Not MoreThan 12"
Unit Configuration Type AP Unit Configuration Type AK
Figure 9 - 217⁄8" (556mm) Deep Full Adapter Back Unit With Standard LouverApplication
Figure 10 - 217⁄8" (556mm) Deep Full Adapter Back Unit with High LouverApplication
Not MoreThan 28"(711mm)
FloorLine
Unit Configuration Type AN
1"(25mm)
Sealed CementMortar;Pitch AwayFrom Unit
Louver
Piping
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Lintel(By Others)
Piping
FloorLine
Sealed CementMortar;Pitch AwayFrom Unit
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Louver
Lintel(By Others) Piping
Piping
Important: Gasket sealing surface is required.(see figure 13 & 14 on page 7) Seal under unitrequired.
1"(25mm)
Floor Line
Piping
Piping
Sealed CementMortar;Pitch AwayFrom Unit
Important: Gasket sealingsurface is required. (see figure13 & 14 on page 7) Seal underunit required.
Louver Installation With Typical Unit Configurations
Lintel(By Others)
Gasket Seal Gasket Seal
Floor Line
Gasket Seal
Gasket Seal
Intake Louver
Piping
Piping
Window Sash
“Goose Neck”Insulated Duct (By Others)
Duct Collar (By AAF)
Note:Arrangement AB with full metal back panel, similar toconfiguration type AN. (Outside air opening to be cut andsealed by others.)
IM 725 (1-02) 7
Installing Louvers
Typical Installation MethodsIf the fresh air opening has not yet been made, see figures 5 through12 for the recommended locations and the job-specific plans for theexact location. Follow local codes.
Cut the wall opening so that it is slightly larger than the louver beinginstalled. For dimensions, see Table 1. If the opening is already there,measure to be sure there is a minimum of 3/8" (9mm) clearance aroundall sides. For masonry installations, a lintel must be installed above alllouvers.
In thick wall applications, the portion of the wall between the louverand the unit is the outside air plenum. Line this plenum area with 3/8"(9 mm) mortar or other suitable material. In some applications, the jobspecifications require a metal sleeve connection between the louverand the unit. If using such a sleeve, properly caulk it to ensure aweather-tight seal. This is critical in preventing freeze-ups, colddrafts, and air infiltration. Be sure the wall is smooth, square, andprovides a suitable mating surface.
See figure 13. Before setting the louver, construct a sloping, sealedcement mortar base to drain unwanted moisture to the outside. Be surethe mortar base is 1" (25mm) thick at the unit and tapers toward thelouver. The mortar at the unit also acts as a backing against which theopen cell gasket of the unit itself can seal. This is critical in preventingwater leaks and air leaks under the unit. Be sure the sealed cementmortar base is smooth and flush with the interior wall.If it is not possible to construct a sloping mortar base, then field-supplied flashing is required. See figure 14. The flashing should
terminate flush with the exterior of the building. Place a bead of caulkunder the flashing to prevent moisture from wicking back to the unit.Do not caulk the joint between the louver and the flashing. This jointis designed to let unwanted moisture escape.
Personal injury hazard. Avoid contact with sharp edges.
See figures 5 through 12. Before setting the louver, be sure the drainlip or weep holes are at the bottom, and the bird screen is towards theunit. See figures 3 and 4. Place a heavy bead of caulk along the top andthe two vertical sides of the louver, leaving the bottom uncaulked sothat if moisture gets into the area between the louver and the unit, it candrain to the outside, unrestricted.
If the louver is supplied with flanges, (see figure 4) place an additionalbead of caulk on the inside of the top and side flanges that come incontact with the building facade. Do not caulk the bottom flange. Placethe louver in the opening and push it tight against the suppliedbuilding, fastening it to the exterior of the building using fasteners (byothers) appropriate to the installation. Seal the top and sides with awaterproof caulk to make it weather-tight. Do not caulk the bottom ofthe louver; doing so might trap unwanted moisture behind the flange.(See figure 16)
If the louver is supplied with no flanges, (see figure 3) place the louverin the opening so that it is recessed a minimum 1/16" (2mm) beyondthe building facade or as directed in the architectural plans. If specifiedin the plans, secure the louver in the wall using mechanical fasteners(supplied by others) appropriate to the installation. (See figure 15 forsuggested fastening). With the louver solidly in place, run a bead ofcaulk around the perimeter of the louver to seal it weather-tight. Do notplug the weep holes (horizontal louver) or the drip line (verticallouver). This might restrict the flow of unwanted moisture to theoutside (see figure 16)See figure 14. If flashing was used instead of the sloping mortar base,caulk the flashing where it meets the inside of the opening between thelouver and the unit. This helps prevent moisture from getting under theflashing and into the room.
CAUTION!
Louver
NoCaulk
Unit Gasket
Wall Unit
1" (25mm)
Floor
Caulk(ByOthers)
Flashing(ByOthers)
Figure 14 - Typical Louver Installation with Flashing
Bird ScreenSealed CementMortar PitchedAway from UnitToward Louver
1" Minimum
Vertical or Horizontal BladeWall Intake Louver(Recessed Without Flange)(Horizontal Blade Shown)
Notes:1. Horizontal blade wall louver shown. Vertical blade wall louver also available
with Ventimatic shutter.2. Optional exterior grille matches unit ventilator wall louver in material and
design. Mounted on wall louvers.3. Optional steel interior wall grille should be used to conceal the interior wall
opening whenever the Ventimatic shutter is not located behind shelf cabinetsor DraftStop enclosure. Hardware to mount the interior wall grille is notincluded.
Installing the VentiMatic Shutter Assembly
The VentiMatic Shutter Assembly is mounted on an installed walllouver. For larger units with 100% ventilation air dampers, twoVentiMatic Shutters may be mounted side by side on the same louver.See figure 20.
The size and appearance of the wall louvers with or without optionalgrilles used with the unit ventilator, and the VentiMatic Shutter, areidentical.
Note: Birdscreen and louver are shipped in one (1) piece.
Pre-Installation Considerations
VentiMatic™ Shutter AssemblyIn many installations, an AAF®-HermanNelson® VentiMatic ShutterAssembly is specified. See figure 17. This one-way shutter is acontinuously variable, gravity actuated, room exhaust vent that operatesin direct response to positive static pressure. It opposes any airflowinto the room and allows a slight positive pressure.It is important that the VentiMatic shutter and unit ventilator louversare mounted on the same wall. This neutralizes the effect of the wind.Forcing excess air into the room through the unit ventilator louverovercomes the same wind pressure that works to keep the VentiMaticshutter closed. This prevents room air exhausting from the roomthrough the VentiMatic shutter.
Figure 17 – VentiMatic Shutter Assembly
Outside
Louver
VentiMatic Shutter
RoomsideRelief Air
When installing VentiMatic Shutter(s) on the wall louver, make sureall moving parts are free to operate unobstructed and placed level andplumb for proper operation. If optional steel interior wall grille isfurnished, install as shown in Figure 18.
IM 725 (1-02) 9
Plastic packaging is a suffocation hazard, dispose of properly.Keep away from children.
Cleaning agents may cause serious damage to internalcomponents, such as aluminum coils and electronic controls,etc. Do not operate unit ventilator while building maintenancecleaning agents are in use.
Aluminum Wall LouverAssembly with Bird Screen
(See Note 1) 3'' (76mm)
VentiMaticShutterAssembly
Center Cover103⁄8"(264mm)
Figure 20 - Two VentiMatic Shutters & Wall Louver
Aluminum Wall LouverAssembly With Bird Screen(See Note 1)
B(see table 1,
page 7)
SteelVentiMaticShutterAssembly
41⁄8"(105mm)
237⁄8" (606mm)or
357⁄8" (911mm)
2" (51mm)
103⁄8"(264mm)
3" (76mm)
Decorative Exterior Grille Also Available (See Note 2)(Bird Screen not shown)
Figure 19 - Single VentiMatic Shutter & Wall Louver
B(see table 1,
page 7)
Before Installing Unit Ventilator
Check that the lifting equipment can handle the weight of theunit safely. Personal injury may result if proper lifting andmoving methods are not used. (See table 2, page 11 forapproximate shipping weights)
Personal injury hazard. Handle with care to avoid possible cutsand abrasions from exposed edges. Avoid contact with sharpedges.
Improper handling can damage internal components. Do notstand the unit on end or stack.
This product was carefully packed and thoroughly inspectedbefore leaving the factory. Responsibility for its safe deliverywas assumed by the carrier upon acceptance of the shipment.Claims for loss or damage sustained in transit must thereforebe made upon the carrier, as follows:VISIBLE LOSS OR DAMAGEAny external evidence of loss or damage must be noted on thefreight bill or carrier’s receipt, and signed by the carrier’s agent.Failure to adequately describe such external evidence of lossor damage may result in the carrier’s refusing to honor adamage claim. The form required to file such a claim will besupplied by the carrier.CONCEALED LOSS OR DAMAGEConcealed loss or damage means loss or damage which doesnot become apparent until the product has been unpacked. Thecontents may be damaged in transit due to rough handling eventhough the carton may not show external damages. When thedamage is discovered upon unpacking, make a written requestfor inspection by the carrier’s agent within fifteen (15) days ofthe delivery date. File a claim with the carrier since suchdamage is the carrier’s responsibility.
WARNING!
CAUTION!
CAUTION!
NOTICE
WARNING!
WARNING!
Step 1Uncrate and Inspect the Unit Ventilator(s)Carefully remove the packaging, remaining alert to any signs ofshipping damage. Be careful not to discard components that may beincluded with the packaging. (You may want to retain some or all ofthe packaging to provide jobsite unit location information andtemporary protection for the unit ventilator after installation.) Be sureto dispose of plastic packaging and protective cardboard properly, inaccordance with local recycling rules and guidelines.If unit is damaged, file a claim with the carrier. Notify the local AAF®-McQuay Unit Ventilator representative immediately.
Properly Identify Unit Ventilator(s)To be sure the correct unit ventilator(s) is/are installed in the correctlocation(s), the installer must check the packing list and unitidentification/tagging number(s) against the plans. Further, the unitdata plate, (see figure 21) located on the lower right end of the unitventilator, contains specific information of standard components asfollows: (see next page)
Installing The Unit Ventilator
Figure 21 - Unit Ventilator Data Plate and Serial Number Location
Outside
Outside▲
▲
Decorative Exterior Grille Also Available (See Note 2)(Bird Screen not shown)
Directions given in this bulletinfor right and left sides assumea position facing the indoor sideof the unit ventilator
INFORMATION
10 IM 725 (1-02)
1. Product CategoryU = Unit Ventilator
2. Product Identifier*AVS = Floor, Face and Bypass Damper, Heat/Cool, Heat Only, CoolOnlyAVV = Floor, Valve Control, Hydronic or Electric Heat/Cool, HeatOnly, Cool OnlyAVR = Floor, Valve Control, Hydronic or Electric Reheat/DehumidAVB = Floor, Face and Bypass Damper, Hydronic Reheat* End panels not included; Ordered as accessory, shippedseparately boxed
7. Heating Options00 = None12 = Low Electric Heat, 3-element13 = High Electric Heat, 6-element65 = 1-row, Hot Water66 = 2-row, Hot Water67 = 3-row, Hot Water68 = Low Capacity Steam69 = High Capacity Steam78 = Low Capacity Steam, Opposite End Drain79 = High Capacity Steam, Opposite End Drain
Unit Ventilator (Floor Type) Data Plate - Specific Information
8. Hand Orientation [Right (RH) Left (LH)]A = LH Both Coils (only w Controls by Others)B = RH Both Coils (only w Controls by Others)D = RH Electric Heating, One CoilE = LH Heating, RH CoolingF = RH Heating, LH CoolingG = RH Electric Heating, LH CoolingR = LH Single CoilS = RH Single Coil
9. Controls15 = MicroTech w Unit Mounted Sensor16 = Part Load Variable Air MicroTech w Unit Mounted Sensor and
Humidity Sensor (if required)19 = MicroTech for Remote Wall Sensor (accessory Sensor and
Humidity Sensor (required)20 = Part Load Variable Air MicroTech for Remote Wall Sensor
(accessory Sensor/ Humidity Sensor required)23 = Field Mounted Controls by Others17 = Digital Ready/with Damper Acutators, (3)@ 10k NTC Sensors,
3 Terminal Strips, 75 VA 24 Volt T’fmr, w/o UV Controller
10. DischargeAB = 21-7/8" Unit, Top Bar Grille Discharge, Full Adapter Back wClosed Pipe Tunnel w Solid BackAK = 21-7/8" Unit, Top Bar Grille Discharge, Partial Adapter Back wOpen Pipe TunnelAL = 16-5/8" Unit, Top Bar Grille DischargeAM = 21-7/8" Unit, Top Bar Grille Discharge, 2" Stepdown FullAdapter Back w Closed Pipe TunnelAN = 21-7/8" Unit, Top Bar Grille Discharge, Full Adapter Back wClosed Pipe TunnelAP = 21-7/8" Unit, Top Bar Grille Discharge, Partial Adapter Back wClosed Pipe Tunnel, Top Duct Intake
11. Return Air (RA) / Outside Air (OA)22 = RA Bottom Front / OA Rear Duct Collar24 = 100% RA Bottom Front / No OA Opening / No OA/RA Dampers30 = RA Bottom Front w Draft Stop / OA Rear Duct Collar
12. Power ConnectionG = Box w Switch
13. ColorB = Putty BeigeG = Soft GrayI = Antique IvoryW = Off White
14. SKUB = Standard DeliveryC = Extended Delivery
15. Product Style1
Field-Installed Accessories may accompany Unit Ventilator(s), ormay be shipped separately. These may include: Adapter Backs;Aluminum Louvers; Aluminum Grilles; Auxiliary Drain Pans; Controls/ Sensors; End Panels; Spare Filters; MicroTech Controls, Sensors(temperature, humidity, CO2); End of Cycle DDC Valve; ModulatingDDC Valves; Subbases. See instructions shipped with accessoriesand install according to these and the plans.
Field 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Model U AVS 4 S07 A S 65 E 23 AL 22 G B C 1
IM 725 (1-02) 11
ModelsAVS, AVV, Dimension "A"
AVR, AVB Inches (mm)
S07 48" (1219)
S10 60" (1524)
S13 72" (1828)
S15 84" (2133)
Models Shipping Weight Approx. Shipping WeightFilter Size Unit Length* NumberAVS, AVV, lbs. (kg) lbs. (kg) in. (mm) in. (mm) Of Fans
AVR, AVB 165/8"Units 217/8"Units
S07 350 (168) 370 (163) 10 x 36.5 x 1 62 (1575) 2(254 x 927 x 25)
S10 425 (193) 445 (202) 10 x 48.5 x 1 74 (1880) 3(254 x 1232 x 25)
S13 495 (225) 525 (238) 10 x 60.5 x 1 86 (2174) 4(254 x 1551 x 25)
S15 570 (259) 600 (272) Two: 10 x 36.5 x 1 98 (2489) 4(254 x 927 x 25)
Step 2Position the Unit Ventilator
Move the unit ventilator to the correct location. See Table 2 for approximate shipping weights.Carefully remove unit ventilator from wood skid. Be sure to properly dispose of the skid in accordance with local recycling rules and guidelines.
Table 2- Approximate Shipping Weights, Physical Data
* Measurement is without end panels. All unit ventilators are 30" (762 mm) high.
Figure 22 - Front View With End Panels - Mounting Holes Locations
Mounting Holes
Figure 23 - Rear View Without End Panels And Subbase - Piping And Electrical Knockout Locations And Dimensions
131⁄2"(343mm)
7" (178mm)
22"(559mm)
51⁄2"(140mm)
11⁄2"(38mm) 7"
(178mm)
5" (127mm)
4" (102mm)
27/8" (73mm)
8"(203mm)
8"(203mm)
Knockout Opening Between PipeTunnel & End Compartment.
Rear Entry Area or Draftstop Opening Knockouts
30"(762mm)
61⁄2" (165mm)
1" (25mm)
7" (178mm)1" (25mm)
10"(254mm)
231⁄2"(597mm)
Outdoor Air Intake Opening
NOTICE
End compartment Draftstop knockoutsmust be removed for proper Draftstopoperation. (21-7/8" units only)
A(See Table 3)
IMPORTANT!
To prevent leakage of outdoor air that wastes energy, causes drafts and erratic unit ventilator operation, be sure to heed the following details:At the correct unit ventilator location, examine the wall surface, making sure that it is smooth, plumb, and perpendicular to the floor, (SeeFigure 1). The seals on the rear of the unit ventilator will take up the small irregularities found in normal masonry construction. If the wall isirregular or has mullions, install furring strips to provide a flush surface against which the unit ventilator can seal. If there are moldings onthe floor/wall line, omit them behind the unit ventilator. Provide a sealing surface at the floor line. Install a seal pad under the unit to preventair leakage. Install the unit ventilator against a wall made of non-combustible material, and on a floor made of non-combustible material. Floormust be level, unbroken and structurally strong to support the unit.
Table 3 - Dimension Between Mounting Holes
Note:See Draftstop IM bulletin for suggested installationprocedure.
12 IM 725 (1-02)
Step 3Make Piping Connections
Be sure the hot and chilled water supply and return system arethoroughly flushed and cleaned before connecting piping to theunit ventilator.
In All SystemsBe sure to install the control valve(s) on the correct unit ventilator.Indiscriminate mixing of valves in the field can result in valvesimproperly sized for the desired flow rate, which can result in pooroperation and coil freezeups. Install control valve so there is at least2" (51mm) minimum clearance to remove the actuator from the valvebody.Be certain that the control valve is installed correctly, with itsorientation vertical. Valves should be installed at least 5° off center.
Be certain that the control valves are installed with the properport orientation to provide proper flow and fail safe operation.Incorrect installation can result in improper unit operation, and/or the possibility of coil freeze-up.
With future servicing considerations in mind, use standard, field-supplied shutoff valves and union connections; this permits easyremoval of the coil or control valve if servicing is required.
While brazing have an extinguisher readily available. Wearappropriate eye and hand protection. Ensure all areas withshared ventilation have ample fresh air ventilation.
Refer to figure 1 and figures 22 through 27 and attach the unitventilator to the wall through the four (4) mounting holes provided,using field-supplied fasteners appropriate to the wall construction andthe washers provided in the brown envelope with these instructions(figure 25). Envelope also contains allen wrench to provide access tounit. Push the unit ventilator tight to the wall structure so that theoutdoor air seals are compressed. Secure the wall fasteners to preventthe unit ventilator from moving and tipping over.
Remove moldingsbehind unit
Before setting the unit ventilator in place, if it is a cooling unit, checkthe condensate drain hand connection to be sure it is the same as thecooling coil hand of connection, and that it agrees with the drain stub-up. If necessary, move condensate drain cap to the opposite end. Donot discard (see figure 24).
Before setting the unit ventilator in position, be sure that field-supplied electrical connections are in place, de-energized and inaccordance with the plans.Move the unit ventilator into position against the wall surface. Checkto see that the unit ventilator is level, from end to end and back to front.Using a 4' level is recommended. Leveling bolts are located at eachend of the front kickplate (see figure 27).
Unit must be anchored to an internal wall column or other suitablesupport (see figure 1, page 3)
11"(279 mm)
7⁄8"22 mm)O.D. Copper
Drain
7⁄8"(22 mm)O.D. Copper
Drain
5"(127 mm)
CondensateDrain
Figure 24 - Move Condensate Drain Cap To Opposite End of Drain Stub-Up.
Left Hand
Front View of End Compartment
Right Hand
11"(279 mm)
Figure 25 - Shipping Envelope Contents
Figure 26 - Setting The Unit Ventilator In Place
Figure 27 - Leveling Legs Location
DANGER!Disconnect all electrical power before servicing unit to preventinjury or death due to electrical shock.
CAUTION!
CAUTION!
WARNING!
CAUTION!
IM 725 (1-02) 13
In Water SystemsAfter flushing piping adequately, so all debris is removed, fill thesystem.
At initial operation, vent manually by unscrewing the vent plug one ortwo turns, figure 31. After venting, tighten the vent plug firmly.
Unscrew the vent plug only one or two complete turns. Systemis under pressure and can result in severe personal injury
WARNING!
Figure 31 - Vent and Drain Plug
Unscrew the vent plug one ortwo turns to manually ventsystem.
Water system under pressure. When venting keep face andbody parts well away, and vent slowly.
Figure 28 - Hot Water Coil Connections
Chilled Water Coil
Hot Water Coil
Chilled Water Return
Chilled Water Supply
Hot Water Return
Hot Water Supply
Water Coil ConnectionsHook up water piping in accordance with the below figure’s 28 and 29for hot water and chilled water coil connections.
Figure 29 - Chilled Water Coil Connections
Failure to install water piping to coils properly can result inimproper unit operation and possible coil freeze-ups.
Proper ventilation is required for brazing. When brazing, be sure toprotect unit ventilator components from overheating damage (meltinginsulation, also damage to valves, wiring, electronics, sensors, etc.).Before filling, be sure to flush all piping adequately so that all debrisis removed. Foreign debris can prevent proper valve operation, resultingin overheating, overcooling, etc.Ensure proper insulation of supply and return piping. Proper insulationprevents loss of unit ventilator capacity, overheating of endcompartment, and / or moisture dripping.The piping to and from the unit must be protected from outside air andfreeze conditions. The piping must be suitably insulated forcondensation or heat lose or gain. Penetrations entering the unit endcompartments must be fitted/sealed for unit integrity.
Figure 30 - Protect Components From Overheating Before Brazing
Use A Quenching ClothWhen Brazing, to PreventOverheating The PipingComponents (Avoid ValveDamage and EraticOperation)
Vent
Drain Plug
CAUTION!
WARNING!
14 IM 725 (1-02)
Heating Coils00 = None
Cooling CoilsV = 2 Row CW CoilS = 3 Row CW Coil
W = 4 Row CW CoilY = 5 Row CW Coil5 = 2 Row High Capacity CW Coil6 = 3 Row High Capacity CW Coil
Heating OnlyFigure 32 - Hot Water Heating Only Unit(Coils 65, 66, 67)
Cooling Only
Unit Series S07 S10 S13 S15 Suction Line O.D. (in/mm) 3⁄4 19 3⁄4 19 7⁄8 22 7⁄8 22 Liquid LIne O.D. (in/mm) 1⁄4 6.35 1⁄4 6 3⁄8 10 3⁄8 10
Notes:1. All coils have same end supply and return connections.2. Steam coils have a factory installed pressure equalizing valve and a 24" (610mm) long
pressure equalizing line which terminates in a 1⁄2" M.P.T. fitting.3. Steam/hot water connections may be same end as cooling coil connections, but they
are recommended to be opposite end to facilitate piping. (Must be opposite end whenusing AAF controls.)
4. Cooling condensate connection is shipped same end as cooling coil connections, butis field reversible.
5. Electric heating coil power connections are right end only. Junction box has 1"(25mm)and 2" (51mm) (trade size) knockouts, 101⁄2" (267mm) from right end of the unit.
6. For limitations with coil combinations see tables 151-1, 151-2, 152-1 and 153-1.7. Coil stubs are 7⁄8" I.D. (female) and terminate 9" (229mm) from the end of the unit.8. Steam coils are 11⁄8" female (sweat) connections and terminate 9” (229mm) from the
end of the unit.9. DX coils (G) have O.D. sweat connections. Interconnecting tube by others. See table
69 = High Capacity Steam Coil78 = Opposite End Drain Low Capacity Steam Coil79 = Opposite End Drain High Capacity Steam Coil12 = Low Electric Heat Coil13 = High Electric Heat Coil00 = None
L.H. Connections
A
B
S
R
J115⁄8
(295 mm)
133⁄8(340 mm)
133⁄8(340 mm)
115⁄8(295 mm)
R
S
A
B
J
E
F
R
S
J
137⁄8(352 mm)
155⁄8(397 mm)
133⁄8(340 mm)115⁄8
(295 mm)
R
S
A
B
J
HW C
oilCW
Coil
E
F
S
R
J
115⁄8(295 mm)
73⁄8(187 mm)
R
S
C
A
J
Steam
CW Coil
D
B
J113⁄8
(289 mm)
133⁄8(340 mm)
R
S E
F
J
HW C
oil
137⁄8(352 mm)
155⁄8(397 mm)
R
SG
E
J95⁄8
(244 mm)
137⁄8(352 mm)
JunctionBox
HJ
Figure 37 - Chilled/Hot Water (2-pipe) Unit(Coils D, E, F, U, 1, 2, 3, 4)
Figure 38 - Chilled Water and Hot Water UnitCooling Coils S, W, V, 5, 6, 7 Heating Coils 65, 66, 67
Figure 39 - Chilled Water and Steam UnitCooling Coils S, W, V, 5, 6, 7Heating Coils 68, 69, 78, 79
Figure 40 - Direct Expansion (G) and Hot Water UnitCooling Coil G Heating Coils 65, 66, 67
Figure 41 - Direct Expansion (G) and Steam UnitCooling Coil G Heating Coils 68, 69, 78, 79
Figure 42 - Direct Expansion and Electric HeatingCooling Coils G Heating Coils 12, 13
S = SupplyR = ReturnLL = Liquid LineSL = Suction Line
LL
SL
D
B
J113⁄8
(289 mm)
133⁄8(340 mm)
Steam
LL
SL
Air Flow
AirFlow
Air Flow
AirFlow
S = SupplyR = ReturnLL = Liquid LineSL = Suction Line
LL SL
C
73⁄8(187 mm)
C
LL
SL
73⁄8(187 mm)
JunctionBox
HJ
R.H. Connections
133⁄4(349 mm)
D
C113⁄8
(289 mm)
73⁄8(187mm)
AirFlow
LL
SL
HJ
R.H. Connections
133⁄4(349 mm)
JunctionBox
Air Flow
133⁄8(340 mm)
115⁄8(295 mm)
RS
BA
Heating Dimensions ShownR.H. Connections
Cooling Dimensions ShownL.H. Connections
Heating Dimensions ShownR.H. Connections
Cooling Dimensions ShownL.H. Connections
A
B
S
R
J
115⁄8(295 mm)
133⁄8(340 mm)
Steam
Air Flow
Note: For opposite end drain steam coils (code 78,79) Return (R) is 71⁄4˝ (184mm) from bottom of unit and C - 27⁄8˝ (73mm) from back of unit.
Coil Headers, Locations (Continued)
IM 725 (1-02) 17
Valves and Piping
The optional factory-supplied AAF®-HermanNelson® Control Valve(s)for water applications can be either 2-way or 3-way type, and is / areshipped separate from the unit ventilator itself so no shipping damageoccurs to the piping of the connection stub from the weight of the valveand to provide the installer with maximum flexibility in making thefield piping connection. Before proceeding, see figures 53 through 62as applicable, as well as the job-specific piping drawings.
Face and Bypass2-Way and 3-Way End-of-Cycle Valves
Control 2 PositionElectrical 24 VAC, 50/60 Hz
Stroke Power Stroke 9 to 11 secondsSpring return 4 to 5 seconds
Notes:1. See label furnished on 2-way valve to determine direction of flow through the
valve.2. Adhere to the port orientation shown for the 3-way valve.
For hot water applications and chilled water/hot water (2-pipe) applications, the2-way valve furnished is normally piped open to the coil; the 3-way valve is pipednormally open to the coil.For chilled water applications, the 2-way valve furnished is normally piped closedto the coil; the 3-way valve is piped normally closed to the coil.All water coil stubs are 7/8" I.D. female sweat. Coil connections terminate 9"(229mm) from the end of the unit. Hot water connections may be same end ascooling coil connections, but are recommended to be opposite end to facilitatepiping. When using AAF® MicroTech controls, they must be opposite end.
The 2-way EOC hot water or 2-pipe CW/HW valve is furnishednormally open to the coil. When the valve is de-energized (off) thereis full flow through the coil. Energizing the valve shuts off the waterflow.
Figure 53 - 2-way EOC, Normally Open, Hot Water or 2-pipe CW/HW Valve Piping
The 3-way hot water or 2-pipe CW/HW valve is furnished normallyopen to the coil. When the valve is de-energized (off) there is full flowthrough the coil. Energizing the valve allows the water to bypass thecoil.Figure 54- 3-way EOC, Normally Open, Hot Water or 2-pipe CW/HW Valve Piping
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-way EOCValve Unit Coil
Unions
A B
Return
Return
Shutoff Valve
Shutoff Valve
Supply
Supply
3-way EOC Valve
Unit Coil
Union
BalancingValveBypass
AB
AB Union
Heating – Hot Water End of Cycle Valve Piping
18 IM 725 (1-02)
Figure 59 - 2-way Modulating, Normally Open, Hot Water or 2-pipe CW/HWValve Piping
The 2-way EOC CW valve is furnished normally closed to the coil.When the valve is de-energized (off) there is no flow through the coil.Energizing the valve allows flow through the coil.
The 3-way EOC CW valve is furnished normally closed to the coil.When the valve is de-energized (off) the flow bypasses the coil.Energizing the valve allows flow through the coil.
The 2-way Modulating hot water (2-pipe CW/HW) valve is furnishednormally open to the coil. When the valve is de-energized (off) thereis full flow through the coil. Energizing the valve reduces the volumeof water flow in a modulating fashion.
Return
Return
Balancing and Shutoff Valve
Shutoff Valve
Supply
Supply
2-WayModulating Valve Unit Coil
Unions
AB
The 3-way Modulating hot water or 2-pipe CW/HW valve is furnishednormally open to the coil. When the valve is de-energized (off) thereis full flow through the coil. Energizing the valve allows a varyingamount of water to bypass the coil.
Figure 60 - 3-way Modulating, Normally Open, Hot Water or 2-pipe CW/HW ValvePiping
Return
Return
Shutoff Valve
Shutoff Valve
Supply
Supply
3-way Modulating Valve
Unit Coil
Union
Union
Balancing Valve
B
ABA
A
CAUTION!
Care must be taken with modulating valves to ensure properwater flow. In freezing conditions, water flow must be maintainedthrough the heating coil or a suitable freeze-prevention solutionemployed to prevent freeze-up. Similarly, the cooling coilshould be drained or a suitable freeze-prevention solutionemployed.
IM 725 (1-02) 19
In Steam Systems:The optional factory-supplied AAF®-HermanNelson® ModulatingControl Valve for steam applications is the 2-way type. It is shippedseparately from the unit ventilator to preclude shipping damage, yetprovide the installer with maximum flexibility in making the fieldpiping connection. Before proceeding, see Figure 63, as well as thejob-specific piping drawings.
Return
Shutoff Valve
Shutoff Valve
Supply
Return
Supply
Unit Coil
Equalizing Line
(Note 1)
Steam Trap
See Figures 64 and 65. Connect the 1/4" (6.35mm) vacuum breakertube to the downstream return line. Make this connection downstreamof the trap outlet.
Note: See label furnished on 2-way valve to determine direction of flowthrough the valve.
For steam applications, the 2-way, angle pattern valve furnished isnormally piped open to the coil. All steam coils are 1-1/8" (34mm)female sweat connections. Coil connections terminate 9" (229mm)from the end of the unit.Steam coils have a factory-installed pressure equalizing valve and a24" (610mm) long pressure equalizing line that terminates in a 1/2"M.P.T. fitting.Steam connections may be same end as cooling coil connections, butare recommended to be opposite end to facilitate piping. When usingAAF® MicroTech controls, they must be opposite end.
Figure 64 - Same End Connections (68/69 Coils)
Control Valve: Install OnCenter Coil Connection
Vacuum Breaker(By AAF-HermanNelson)
Vacuum Breaker Tube(By AAF-HermanNelson)
Steam Trap (By Others)
1⁄4˝ Flare By 1⁄2˝ MPTHalf-Union And 1⁄4˝ Flare(By AAF-HermanNelson)
The 2-way Modulating chilled water valve is furnished normallyclosed to the coil. When the valve is de-energized (off) there is no flowthrough the coil. Energizing the valve allows flow through the coil ina modulating fashion.
The 3-way Modulating chilled water valve is furnished normallyclosed to the coil. When the valve is de-energized (off) the flowbypasses the coil. Energizing the valve allows flow through the coil ina modulating fashion.
Typical Hot Water Coil PipingFigure 65 - Face and Bypass With End-of-Cycle Valve
(Piping Within Unit End Compartment)Figure 66 - Face and Bypass With End-of-Cycle Valve (Piping Outside Unit End Compartment)
Figure 67 - 3-Way Modulating Valve Control(Piping Within Unit End Compartment)
Figure 68 - 3-Way Modulating Valve Control(Piping Outside Unit End Compartment)
11
21
3
45
15
67
15
2
3
4
567
8
2
3
4
5
67
8
2
3
4
5
6
7
15
15
1515
15
11
1
15
Coil PipingHeating valve actuators should be mounted in an upright positionabove the centerline of the valve body and should be piped normallyopen to the coil. Modulating valve actuators for hot water applicationsmay be positioned above the valve body a maximum of 75° from thevertical. For steam applications only, mount the modulating valveactuator above the valve body at 45° from the vertical. Two-position,end-of-cycle (EOC) valves used with face and bypass damper controlledunits may be positioned above the valve body a maximum of 85° fromthe vertical. All control valves are shipped loose so no shippingdamage occurs to the piping or the coil connection stub from the
weight of the valve and to provide the installing contractor withmaximum flexibility in making the field piping connections. Refer toAAF-HermanNelson factory instruction sheet shipped with the unitfor port orientation and a piping schematic. Control valves must beinstalled on the units in which they are shipped. Indiscriminate mixingof valves among units can result in valves not properly sized for thedesired flow rate. Control valves should be installed so that there is 2"minimum clearance to remove the actuator from the valve body. As afuture service consideration, provide unions for removal of the unitcoil and/or the control valve.
DescriptionsThree-way control valve (AAF-HermanNelson)
Coil air vent (AAF-HermanNelson)
Coil drain (AAF-HermanNelson)
Shutoff valve (Others)
Balancing shutoff valve(s) (Others)
Supply
Return
Unions (Others)—Must disconect below floor line
2
1
3
6
4
5
7
8 15
14
13
12
11
10
9 Two-way, two-posiiton valve (AAF-HermanNelson)
Union: Half attached to coil, half attached to valve
Modulating control valve (AAF-HermanNelson)
All piping, fittings and unions by others (not AAF-HermanNelson) except as
noted
Check valve and pressure equalizing line (AAF-HermanNelson)
Float and thermostaic steam trap (Others)
Supply and return coil connection and stub-up unions by others
IM 725 (1-02) 21
Typical Steam Coil Piping
Figure 69 - Face and Bypass With End-of-Cycle Valve - Same End DrainConnection (Piping Within Unit End Compartment)
Figure 70 - Face and Bypass With End-of-Cycle Valve - Same End DrainConnection (Piping Outside Unit End Compartment)
Figure 71 - 2-Way Modulating Valve Control - Same End Drain Connection(Piping Within Unit End Compartment)
14
1313
4
6
7
8
15
9
14
4
6 7
15
9 15
15
14
13
4
67
8
15
11
Figure 72 - Opposite End Drain Connection – (78/79 Coils)
Left Hand Steam Supply and Right Hand Steam Return (Shown)
Direct-Expansion R-22 (DX) PipingDX coils have O.D. sweat connections. Interconnecting tubing isfield-supplied. See Table 17, page 24 and job-specific drawings forcorrect tubing sizes.
Wrap TXV valve with a quenching cloth and remove bulb fromsuction line to avoid valve damage while brazing.
CAUTION!
Condensate piping:AAF®-HermanNelson® cooling unit ventilators are designed forcondensate removal into a condensate disposal system. Do not connectthe unit drain connection so that condensate exits to the outside and/or is exposed to freezing temperatures. Installer is responsible forany damage that might be caused from freezing condensate. Inapplications with an end compartment auxiliary drain pan, see theinstallation instructions shipped with the auxiliary drain pan itself.
STOP! Before BrazingTXV (Thermal ExpansionValve) Protected FromOverheating
BulbRemoved ToPreventOverheatingDamage
Use A Quenching ClothWhen Brazing, to PreventOverheating The TXV ValveBody (Avoid Valve Damageand Eratic Operation)
Figure 74 - Wrap TXV Valve Before Brazing
Proper ventilation is required for brazing. When brazing, be sure toprotect unit ventilator components from overheating damage (meltinginsulation, also damage to valves, wiring, electronics, sensors, etc.).During brazing, bleed nitrogen through the piping. Using field-supplied material suitable for insulating refrigerant lines, wrap thethermal expansion valve (TXV) bulb and the piping between the TXVand the point where it enters the coil with at least one thickness of thematerial. Likewise, insulate the suction line. (See figures 76 -80 fortypical piping and wiring)Ensure proper insulation of supply and return piping. Proper insulationprevents loss of unit ventilator capacity, overheating of endcompartment, and / or moisture dripping.
Piping Stub-up Within Cabinet
Unit End Compartment
Piping Stub-up Within 6" End Panel End Panel 6"
Application and Dimension
Wall Line 111⁄2
103⁄4
Left Endof unit(Less end panel)
Caution: Space available in left endcompartment for piping stub-up.Stub-up including unions and shutoffvalves must disconnect below floorline for unit installation and removal.
1
Space available at left end of unitfor piping stub-up when 6" endpanel is used.
Left End of unit(Less end panel)
Wall Line
4
1
Unit End Compartment
6
All dimensions in inches
Figure 73 - Piping Stub-Up Details, 6" End Panel
IM 725 (1-02) 23
Figure 75 - Typical Piping and Wiring for Split System
2 Wires(+) Ground
To Open Sight Drain
TXV(ThermalExpansion Valve)
Filter Drier(Field Supplied)
Moisture IndicatorSight Glass(Field Supplied)
WeatherproofFused Disconnect Per NEC
2 Wires(+) Ground
InsulatedSuction Line
FusedDisconnect
Unit Ventilator Split Systems Guidelines
The following provides basic guidelines that will provide propersystem cooling and operation of an R-22 commercial DX/hot watersystem for school applications. DX system components must bematched and sized correctly (not oversized) for the load.
The DX system must incorporate the following, provided by others,for proper operation:� Size piping per ASHRAE Refrigeration Handbook (correct
refrigerant and compressor oil flow), see figure 75 and table 17.� Use clean sealed refrigerant grade piping (prevent system
contamination)� Install Liquid Line Filter Dryer (clean/dry system to prevent
damage of operating components), see figure 75.� Install Liquid Line Sight Glass (indicates refrigerant dryness and
if liquid in liquid line - do not use the sight glass to determinewhen refrigerant system is charged correctly), see figure 75.
� Install High Pressure Switch at condensing unit wired in condensercontrol system (protects compressor and refrigerant system fromexcessive pressures - condenser fan failure or overcharging), seefigure 79.
� Install Low Pressure Switch at condensing unit wired in thecondenser control system (low refrigerant pressure switch protectsthe system under low refrigerant suction conditions), seefigure 79.
� Install Low Ambient Temperature Switch at condensing unitwired in the condenser control system (locks out mechanicalcooling below 60°F - proper system operation and free economizerusage), see figure 79.
� Incorporate Compressor Time Delay (5 minute) in condensingunit control system (reduces excessive compressor cycling), seefigure 79.
� Incorporate Low Refrigerant Temperature Sensor (T4) incondensing unit control system (T4 protects the system underlow refrigerant suction conditions) see figure 79.
� UV fans must continue to run upon Low Refrigerant Temperaturetrip of T4 (evaporator air flow dissipates residual low coil surfacetemperatures - suction pressures raised, coil frosting reduced),see figure 79.
� UV fans must continue to run for set time period during unoccupiedmode after satisfaction of the space sensor (dissipates residuallow evaporator coil surface temperatures - reducing coil frosting),see figure 79.
� Lock the Face and Bypass Damper (actuator spring return to fullface when de-energized) in the full face position during mechanicalcooling (full air through evaporator coil reduces low refrigerantsuction conditions, potential coil frosting)
� When Brazing bleed Nitrogen through piping (reduced oxidesand blockage in piping/TXV)
� Use Heat Sink when brazing to prevent overheating the TXVvalve body and bulb (avoid valve damage and erratic operation),see figure 74.
� Verify the TXV bulb securely attached at 2 or 10 o’clock for 7/8" and smaller diameter suction line piping (proper suction gassensing and reduced hunting) See figure 75
� Insulate the TXV bulb (reacts to refrigerant temperatures and notambient), see figure 77.
� Insulate the suction line piping (minimum heat pickup), seefigure 75 and 77.
� Evacuate and properly charge the refrigerant system, see figure78.
� Charge to subcooling at the condensing unit per the condensingunit manufacturer’s instructions, typically 9°F to 12°F subcoolingat 95°F outdoor ambient (results in correct refrigerant distributionat the coil to prevent low suction temperatures)
� Adjust TXV for correct superheat to eliminate/minimize hunting,see figure 80.
� Set superheat to 5°F to 7°F at the UV coil suction line when 95°Foutdoor ambient (proper system superheat for optimumperformance). Allow system to settle for 20 to 30 minutes toreach stable steady state conditions and then recheck/adjustsuperheat if necessary, see table 19.
� Compensate both subcooling and superheat for actual outdoorambient and indoor air temperatures
� In windy areas, add wind baffles to condensing unit or build aparapet (eliminate wind effect on condensing unit coil for properTXV refrigerant flow at lower ambient)
� For lower ambient conditions install variable speed condenserfan head pressure control to maintain head pressures between180psig and 280psig (for proper TXV refrigerant flow at lowerambient), see figure 79.
Hazardous Voltage!Disconnect all electric power including remote disconnectsbefore servicing. Failure to disconnect power before servicingcan cause severe personal injury or death.
Sight Glass
TXV (Thermal Expansion Valve)
Insulate Bulb(Reacts ToRefrigerantTemperature andNot Ambient)Insulate TheSuction Line Piping(Minimum HeatPickup)
Return (Suction Line)
Supply (Liquid Line)
Figure 77 - Insulate Bulb and Suction Line Piping Figure 78- Typical Split System Evacuation/Charging Set-up
Suction Line Service Valve
Liquid Line Service Valve
Outdoor Fan
Compressor
Gauge Bar Hoses
Vacuum Pump
StrainerDrier
TXV
Indoor Fans
ChargingCylinder
Indoor Coil
Outdoor Coil
Low PressureGauge
Outdoor Condensing Unit
Unit Ventilator
High PressureGauge
Figure 79 - Typical Unit Ventilator/Condensing Unit Wiring Diagram
Compressor
CompressorContactor
Capacitor
HeadPressureController(Optional)
FanMotor
HighPressureSwitch
LowPressureSwitch
TDR = Time Delay RelayTB = Terminal Block
T4
23
1
Rec3
Line Voltage
Factory WiredField Wired (By Others)
TDR or TB
Low AmbientTemp. Switch
T1 T2
L2L1
L2
L1
24V
24V
Checking System ChargeThe system charge should be checked under design conditions [95°Foutside air, 80°F/67°F (DB/WB) indoor air]. Refer to condensing unitmanufacturer's guidelines.Before adjusting refrigerant charge, verify that the unit ventilator isoperating at normal design cfm. Nominal cfm is determined with a drycoil, and cfm will be reduced during air conditioning operation witha wet coil. Filters and coil must be clean and fan speed set at high.temperature to obtain subcooling.
1. Measure outdoor ambient. It must be between 65°F and 105°F.2. Measure liquid line temperature 6 inches from the TXV inlet.3. Measure liquid line pressure near the TXV.4. Determine saturated liquid temperature from saturated temperature
pressure chart (table 18).5. Subtract measured liquid line temperature from saturated liquid
temperature to obtain subcooling.6. Adjust charge per condensing unit manufacturer recommendation
to obtain 9 - 12°F subcooling.
(By Others)(By Others)
Note:Table 17 piping dimensions are for systems with up to 30 ft. (9.14 m) verticalseparation and up to 100 ft (30.47 m) horizontal separation from the outdoorcondensing unit.
Table 17 - Dimensions, DX Tubing inches (mm)
Models AVS, AVV, AVB, AVR Suction Line O.D. Liquid Line O.D.
Determining System SuperheatAfter the subcooling has been determined, check system superheat.
1. Determine required superheat from superheat range, table 18.2. Measure suction line temperature 6 inches from service valve.3. Measure suction line pressure at service valve and determine
saturated suction temperature from table 18.4. Subtract saturated suction temperature from measured temperature
to obtain superheat.5. Refer to table 19 and adjust charge as required for correct superheat
at ambient conditons.
Note:Each time that charge is added or removed from the system, allow the system torun approximately 20 - 30 minutes before pressure and temperature readings aretaken and superheat calculations made.
Note:If system hunting occurs or subcooling is reduced, it may be necessary to adjustTXV to obtain correct superheat.
Filter(s)With AAF-HermanNelson’s single-filter design, filter changeouttakes only seconds.
Turn off the unit, (fan speed switch or unit on/off switch is locatedbehind the right front end compartment panel). Remove the centerfront panel, pull out the filter and replace with a clean filter. Replacethe center panel and restart the unit.
Filters should be replaced during the first week of placing into serviceto prevent dirt carry-over into the internals of the unit and back into theclassroom, (see figure 81). A periodic filter changeout program shouldbe established. Filters are included in all units. AAF®-HermanNelson®
single-use filters are standard on all but electric heat units, which comewith permanent wire mesh filters. Permanent wire mesh and renewablemedia filters are available for non-electric heat units, in lieu ofsingle-use filters.
• Single-use filters feature Amerglas media. They are designed tobe used once and discarded.
• Permanent filters are metal filters that may be removed forcleaning and reused numerous times.
• Renewable media filters (figure 81) consist of a heavy paintedmetal structural frame and renewable Amerglas media
12" Left FrontAccess Panel
Filter
Motor
12" Right Front Access Panel
Renewable Media (Single-use AndPermanent Wire Mesh Filters Also Available.)
StructuralFrame
Top AccessDoors
Figure 81 - Filter installation
Superheat Adjustment1. Remove the seal cap from thermal expansion valve (see figure 80).2. Turn the adjustment screw clockwise to increase superheat and
counterclockwise to decrease superheat (see figure 80). Onecomplete 360° turn changes the superheat approximately 3-4°F,regardless of the refrigerant type. As much as 30 minutes may berequired for the system to stabilize after the adjustment is made.
3. Replace and hand-tighten seal cap.
Figure 80- Superheat Adjustment of TXV
SuperheatAdjustment Screw
Counterclockwise ToDecrese Superheat Clockwise To Increse
Superheat
CAUTION!
Remove Seal Cap
Do not force adjustment stem of TXV. When adjusting superheatsetting, there are a maximum of 10 turns on the stem. Turningadjustment stem after reaching stop will damage valve.
Units must have a filter installed when operating.
26 IM 725 (1-02)
Table 20 - Floor AV Electrical Data/Motor Data and Unit Amp
Unit CFM L/s Motor Unit Current #
Series (Nom.) HP Watts115V 208V 230V 265V
S07 750 354 1/4 164 1.8 1.0 0.9 0.8
S10 1000 472 1/4 244 3.1 1.7 1.5 1.3
S13 1250 590 1/4 306 3.5 1.9 1.8 1.5
S15 1500 708 1/4 334 3.7 2.0 1.8 1.6
# Amps at unit voltage, 60 Hz, single phase
Step 4Make Electrical Connections
To avoid electrical shock, personal injury or death, be sure that field wiring complies with local and national fire, safety, and electrical codes,and voltage to the system is within the limits shown in the job-specific drawings and unit electrical data plate(s).
Power supply to unit must be disconnected when making field connections. To avoid electrical shock, personal injury or death, be sure torigorously adhere to field wiring procedures regarding proper lockout and tagout of components.
See Table 20, and Figures 82 - 87 and the job-specific electricaldrawings before proceeding with field power and control wiring. Seealso the wiring diagram provided on the unit ventilator right frontaccess panel.In addition, those unit ventilators equipped with optional electricheating coil have electric heating coil power connections at right endonly.
Instructions1. Provide power supply to right end compartment to match unit
nameplate.
2. Wire leads provided from unit ventilator electric connection boxto load side of unit power switch (switch provided by AAF).The junction box has 1"(25mm) and 2"(51mm) knockouts, located10-1/2"(267mm) from right end of unit.
3. Provide ground wire from grounding screw in switch junction boxto switch ground terminal.
4. Wire field power supply to line side of unit power switch. Wireground conductor to switch ground terminal.
5. Mount unit power switch in switch junction box and install switchcover plate (provided).
Note:On units with electric heat, the 2 pole unit power switch is replaced by a 3 poleswitch and is mountd as shown on figure 82. (A) shows switch location for valvecontrol units and (B), (C) and (D) show location for Face & Bypass control units.(B) is for 208, 230 and 265 volt vertical (AV) and horizontal (AH) units. (C) showslocation for 460 volt vertical (AV) units and (D) shows location for 460 volthorizontal (AH) units.Also, on electric heat units with controls by others, wiring to the field mountedcontroller is done in the left end compartment. See specific wiring diagram fordetails.
WARNING!
WARNING!
Wire Raceway
Figure 83 - Electric Connection Box in Right Front End Compartment
Switch Junction Box
Fuse
High-Med.-Low-Off Motor Speed Switch
Auto Transformer
Figure 84 - Back View of Electric Connection Box
Molex Plug for Motor
115V Receptacle
Jumper PlugSupplied For"Controls By Others"
CAUTION!
Use copper conductors only. Use of aluminum conductors mayresult in equipment failure and overheating hazards. All wiringin right hand compartment must be class 1.
Figure 82 - Electric Heat Unit Power Switch Locations and Wire Raceway
A
B
C
D
Note:Unit wire sizing should be determined in accordance with NEC and localcodes.
Unit Mounted Microtech™ Direct Digital Controls (DDC) ComponentsThis Drawing shows the location of the standard and optional AAF®-HermanNelson® MicroTech™ control items. The following is a generaldescription of these components.
1. MicroTech Unit Ventilator Controller: This is a factorymounted microprocessor-based DDC control device which iscapable of stand-alone control or network control from a frontend computer. The controller can support sixteen (16) inputsand sixteen (16) outputs. Each input supports either analogsensing and/or binary contact closure. Each output consists ofa binary contact closure to operate controlled devices. Thecontroller will provide status of either the outputs or the inputsupon request from a personal computer connected either to anetwork or an individual controller. The controller containsself-diagnostic capability to maintain constant reliability. Thecontroller provides heating and cooling control in response tovarious inputs as well as the room sensor which may be eitherunit mounted or wall mounted. Damper actuators are preciselypositioned by means of step-and-wait parameters built intocontrol software. Two-position functions such as DX cooling/heating and electric heating are also initiated by the controller.Room temperature adjustment, unoccupied temperature offsetand outdoor air damper minimum position are all adjustable atthe controller. In a network system, these three adjustmentsare not operative and are done as part of the network controlplan.The controller provides a visual means of fault detection withthe use of status LED on board.
2. Room Temperature Adjustments: This item controls the roomtemperature setpoint.
3. Terminal Strips as required: Provides convenient connectionpoints for the following:a. Modulating steam or water control valve (factory wired).b. Wall mounted room sensor.c. Condensing unit control circuit (field wired by others).
4. Damper Actuator(s): These devices position the outdoor androom air dampers and bypass dampers (when furnished) inresponse to the unit ventilator controller. Factory mounted,wired and adjusted.
5. Sampling Chamber: This enclosure houses the room air sensorwhenever a unit mounted sensor is specified. Room air iscontinuously drawn through the sampling chamber to insurefast accurate response to temperature changes within the room.
*6. Time Clock Accessory: This device automatically cycles unitthrough occupied and unoccupied modes in accordance with auser programmed time schedule. Programming instructionsare included. Time clocks have battery backup so they will notrequire resetting if electric power is interrupted. Located infront of the room air fan motor.
7. Electric Connection Box: Contains the motor speed switch,motor speed transformer and fusetron(s) when furnished.Wiring connections to the day/night relay and vent relay aremade in this box. Refer to the unit wiring diagram forspecifics.
8. “High-Med-Low-Off” Motor Speed Switch: Allows user toselect the fan speed desired. The “Off” position shuts unitdown completely.
9. Right End Compartment:Class 1 wiring required.
10. Unit Main Power “On-Off” Switch: Disconnects main powerto unit for servicing the unit or when unit is to be shut down foran extended period.
11. Left End Compartment: Class 2 wiring permitted.
*Not furnished with network units since the function is handled through thecommunication network.
Motor 5
48
9
1011
7
2
1
3 6*
J6 J7 J8 J9
LED RELAY OUT AUX OUT STATUS POWER PWRG 0 H 1 2 3 4 5 6 7 8 V 9 10 G 24V
1 2 3 1 2 3 4 5 6 R 5 4 3 2 1 0 G S G S G S G S G S G S G S G S G S1 S0COMMB COMM A DIGITAL INPUT IN 13 IN 12 IN 7 IN 6 IN 5 IN 4 IN 3 IN 2 IN 1. 0
J1 J2 J3 J4 J5
MicroTech®
325 ControllerThis devise complies with Part 15 of the FCC rules.Operation is subject to the following 2 conditions:(1) This device may not cause harmful interference.(2) This device must accept any interference received, including interference that may cause undesired operation.
C®
File E159169Model 325
Part No. 107627201
J1 J2 J3
J4
J5
COOLING SETPOINT ISFACTORY SET 6°F ABOVE
HEATING SETPOINT
HI LO
NETWORKADDRESS
% °F °FMINIMUM OA UNOCCUPIED HEATING SETPOINT
POSITION OFFSET
30 40
5020
10 75
0 100 0 20
10
155
70
65 75
60 80
J6 J7 J8 STATUS POWER J9
0123456789ABC
DEF 0123456789ABC
DEF
Remote StatusLED Output
RelayOutputs
AuxiliaryOutputs(TRIAC)
StatusLED
Power SupplyLED
Electro-MechanicalRelays
HexSwitches
DigitalInputs
CommunicationPorts Analog
Inputs
Heating Setpoint Pot
Minimum OADamperPosition Pot
UnoccupiedOffset Pot
Figure 87 - MicroTech Controller
Figure 86 - Sensor Locations
Discharge Air Sensor Room Air Sensor
Holes in FrontAccess Panel Outdoor Air Sensor
Outdoor AirOpening
28 IM 725 (1-02)
Exhaust Fan Interlock
Master/Slave Wiring
Pneumatic Day/NightChangeover Control
Ventilation Lockout ControlNetwork Wiring
Day/Night ChangeoverControl
(Stand-Alone Units Only)
Remote Condensing UnitControl Wiring
MicroTech™ orControls By Others
(Stand-Alone Units Only) (Stand-Alone Units Only)
(Stand-Alone Units Only)
Unit Wiring Terminations Fan/Radiation Interlock
Factory WiringFurnished OnlyAs Required
Left End Compartment
BLK
WHT
RED
GRN
ORG
BLU
Y
C1
O
R
W1
COM
PNK
GRY
RED
For FurtherInformationSee AppropriateField WiringDetail
For Further InformationSee Appropriate FieldWiring Detail
Motor Speed Control Box - Right End
Electric Heat Control Box - Right End
19
20
YEL
36
37
BRN
GroundMain Power SupplyNon Electric Heat Units
1
2
3
SW-1
L1
L2
L3
SW-1 — Main Power “On-Off” Switch
Main PowerSupply ElectricHeat Units(Omit L3 ForSingle PhaseApplications)
Left End Compartment
Y
C1
O
R
W1
COM
(24 Vac. Class II)To Remote CondensingUnit Contactor Coil Day/Night
Changeover (4VAInRush) EnergizeTo Put Unit InNight Mode
Motor Speed Control Box - Right End
19
20
YEL
36
37
BRN
Left End Compartment
BLK
WHT
RED
GRN
ORG
BLU
PNK
GRY
First Unit
ORG
BLU
PNK
GRY
Additional Unit
ORG
BLU
PNK
GRY
Last Unit
Attach Wires (2 Twisted Conductor Shielded),Belden 8761 Or Equivalent, From Unit To UnitIn Daisy Chain Fashion, In Any Order.
BLK
WHT
RED
GRN
ORG
BLU
PNK
GRY
ORG
BLU
PNK
GRY
ORG
BLU
PNK
GRY To LocalMaster Panel
Vent Lockout (4VA InRush)Energize To Close TheOutdoor Air Damper
Motor Speed Control Box - Right End
19
20
YEL
36
37
BRN
Exhaust Fan Interlock (4VAInRush) Energize To OpenOutdoor Air Damper
19
20
YEL
36
37
BRN
Pneumatic/Electric SwitchClose Contacts To Put UnitIn Night Mode (24VACClass II. 1Amp)
Motor Speed Control Box - Right End
19
20
YEL
36
37
BRN
Factory WiringFurnished OnlyAs Required
Ground
Attach Wires (2 Twisted Conductor Shielded),Belden 8761 Or Equivalent, From Unit To UnitIn Daisy Chain Fashion, In Any Order.
Left End Compartment
First Unit
Additional Unit
Last Unit
X3
24 VAC
UVCDI-2
DI-3
DI-4
DI-5
DI-R
Digital InputWiring Example
Auxiliary Output Wiring Example
UVC
AO-10AO-V
+29vdc @ 30mA
294vdcRelay Coil
(Wiring By Others)
Diode(Wiring By Others)
Figure 88 - Typical Power and Control Field Wiring (See Unit Right Front Panel or Unit Wiring Diagram for Electrical / Control Electrical Hookups)
IM 725 (1-02) 29
Typical Wall Mounted Room Air Sensor
Figure 90 - Wall Sensor With Tenant Override, Setpoint Adjustment,Communications Port, and Thermometer (Shown) or without Thermometer
Installation
1. Installer must be qualified, experienced technician.2. Disconnect power supply before installation to prevent
electrical shock and damage to equipment.3. Make all connections in accordance with electrical wiring
diagrams, and in compliance with national and local codes.Use copper conductors only.
4. Do not exceed ratings of the device. This is a low voltagedevice: Never apply more than 12VAC/VDC to any lead ordamage will result.
5. Avoid locations where excessive moisture, corrosive fumes,or vibrations are present.
Note:All sensors have black (common) + white (thermistor sensor) + red (LED)wires. Orange and blue wires are provided for communications and a greenwire for tenant override and set point adjustment
Mounting Procedure For Standard Electrical Box1. Feed the cable from the electrical box.2. Strip 1⁄4" of installation from the end of wires.3. Connect wires to appropriate colored leads. See MicroTech™
unit controller wiring diagram.4. Dress wires down and inside the electrical box.5. Using the two 6-32 x 5⁄8" “flathead screws provided, mount the
sensor to the electrical box.
Mounting Procedure For Wallboard Mounting1. Feed the cable through a hole in the wallboard.2. Strip 1⁄4" of installation from the end of wires.3. Connect wires to appropriate colored leads. See MicroTech unit
controller wiring diagram.4. Dress wires down and inside the hole in the wallboard.5. Using the appropriate mounting screws and plastic anchors (not
Note:Avoid placing wall sensor near drafty areas such as doors or windows. Avoid external walls, or dead spots near exposed columns. Avoid direct sunlight on wall sensor.
Window Exposure
= Incorrect Sensor Location
Window Exposure
Interior Wall
Interior Wall
Window Exposure
Unit
Unit
Interior Wall
Interior Wall
Window Exposure
Cubicle Wall
Shelving
File Cabinet
Shelving
Figure 92 - Incorrect Unit and Wall SensorLocations
WARNING!
30 IM 725 (1-02)
Remove debris, heavy dust anddirt or any obstruction from thearea in front of the return air intakegrille at the floor,(approximately3' - see shaded area) as this willaffect unit performance. If adraftstop system has beeninstalled be sure that all draftstopintake grilles are unobstructed.
NOTICE
See Figure 95 for oiling points. Access to fan shaft bearing is throughleft top access door. Access to the motor bearing is through the righttop access door. Lift the oiler cap. Oil, using a few drops of high gradeSAE 20 or 30 nondetergent oil. Do not over-oil.
Access To Fan Shaft BearingThrough Left Top Access Door Bearing Oiler Cap
Figure 95 - Oiling Points
Figure 93 - Cabinet(s) Meeting Unit Ventilator
Step 5Prepare Unit Ventilator(s) for Start-up
Installing Unit Ventilator End Panels:See Figure 94. Accessory end panels are shipped separately withhardware and kickplate. Align each end panel with the top and frontedges of the unit ventilator. Attach each end panel to the unit ventilatorusing the hardware provided.
Tinnerman Clips
Tinnerman Clips
Screws(insert through endpanel and thread intotinnerman clips on unitsubbase)
Screws(insert through upper mounting holes inside unit endcompartment, and thread into tinnerman clips on endpanel)
End Panel
Figure 94 - Install End Panels With Provided Hardware (1" End PanelShown)
Fit Front Alignment Bar Into WeldedNotches Permitting Alignment Of StorageAccessories With The Unit Ventilator
Adjustable Kick PlateAnd Leg Levelers
Alignment Slot
Access To Motor Through RightTop Access Door
Oil
Oiling the Fan Shaft Bearing and Motor:
Do not attempt to operate the unit fans until the fan bearingshave been oiled.
Unit Ventilator Start-upAfter the unit ventilator has been properly installed, activate unitelectrical power and applicable chilled water/hot water/steam/refrigerant systems.Before proceeding inspect the fan system, ensure all parts are alignedproperly and move freely. Inspect fans and fan discharge area forobstructions. Rotate fan manually. Check that a clean filter is installedand area in front of unit ventilator is free of debris (see figure 93).Using the applicable control, activate the unit ventilator. Dependingon the operating mode selected, the dampers, fans, and othercomponents should operate as needed.Run the unit ventilator for ten minutes, listening and observing. Fansshould be operating correctly, and rotating in the proper direction,without unusual noise. Likewise, the unit should be free of sheet metalrattles and / or unusual noises. All panels should be in place andproperly fastened, and checked for air leaks and condensation.
Step 6Complete Check, Test and Start Procedure(see page 39)
CAUTION!
IM 725 (1-02) 31
Tools RequiredA forklift or other lifting device to install this product (See figure 97).Install this product in accordance with good engineering practices andworkmanship, following these general instructions, plus the job-specific AAF®-HermanNelson® submittal drawings provided forspecific dimensions, unit arrangements, controls and electrical details,pipe stub-up locations, etc.
Apply protective material to lifting support(s) that come incontact with unit to prevent scratching or denting the unit.Support the unit across the entire length to prevent twisting orracking, throughout the process of mounting.
Model AH Ceiling Unit Ventilator InstallationModels AHF, AHB, AHV and AHR Ceiling Units
ImportantBefore beginning installation, please read this publication in its entirety.
Refer to AV installation instructions, page 2.
Exposed
Soffit
Partially Recessed
Concealed
Figure 97 - Suggested Lifting Method
AH Ceiling Unit
Lifting Device
Protective Material To PreventScratching and Denting of Unit.Support Across Entire Length ofUnit to Prevent Twisting orRacking.
Figure 96 - Ceiling Unit Arrangements
Step 1Lifting Ceiling Unit Into Position
CAUTION!
DISCONNECT ALL ELECTRICALPOWER BEFORE SERVICING UNITTO PREVENT INJURY OR DEATHDUE TO ELECTRICAL SHOCK.
WARNINGHAZARDOUS VOLTAGE!DISCONNECT ALL ELECTRIC POWER IN-CLUDING REMOTE DISCONNECTS BEFORESERVICING. FAILURE TO DISCONNECTPOWER BEFORE SERVICING CAN CAUSESEVERE PERSONAL INJURY OR DEATH.
! CAUTIONUSE COPPER CONDUCTORS ONLY.UNIT TERMINALS ARE NOT DESIGNED TOACCEPT OTHER TYPES OF CONDUCTORS.FAILURE TO DO SO MAY CAUSE DAMAGETO THE EQUIPMENT.
!! DANGER
Safety InformationFollow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for brazing operations. Have a fire extinguisher available. Follow all warnings andcautions in these instructions and attached to the unit. Consult applicable local building codes and National Electrical Codes (NEC) for special requirements.
Recognize safety information. When you see a safety symbol on the unit or in these instructions, be alert to the potential for personal injury. Understand the meaningsof the words DANGER, WARNING, and CAUTION. DANGER identifies the most serious hazards that will result in death or severe personal injury; WARNING meansthe hazards can result in death or severe personal injury; CAUTION identifies unsafe practices that can result in personal injury or product and property damage.
Improper installation, adjustment, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may result in personal injury orproperty damage. This product must be installed only by personnel with the training, experience, skills, and applicable licensing that makes him/her “a qualifiedprofessional HVACR installer.”
32 IM 725 (1-02)
1. Product CategoryU = Unit Ventilator
2. Product Identifier*AHF = Ceiling, Face & BypassAHV = Ceiling, Valve ControlAHR= Ceiling, Valve Control with Reheat.AHB = Ceiling, Face & Bypass with Reheat.* End Panels Ship Installed
7. Heating Options00 = None65 = HW One Row66 = HW Two Row67 = HW Three Row68 = Steam Low Capacity69 = Steam High Capacity12 = Low Electric Heat (3 element)13 = High Electric Heat (6 element)
8. Coil ConnectionsE = LH Htg / RH CoolF = RH Htg / LH CoolR = Single Coil LHS = Single Coil RHA = LH Both Coils (only with Controls By Others)B = RH Both Coils (only with Controls By Others)D = RH Electric Heat, One CoilG = RH Elec Ht / LH Cool
9. Controls19 = MicroTech for Remote Wall Sensor (Sensor accessory required)40 = DCV MicroTech for Remote Wall Sensor & Wall CO2 Sensor
(Sensor & CO2 accessories required)17 = Digital Ready (With Damper Actuators, (3) @ 10 K NTC Sensors,
3 Terminal Strips, 75 VA 24 volt Tfmr, Wired; w/o UV Controller)23 = Field Mounted Controls By Others20 = Part Load Variable Air MicroTech for Remote Sensor (Sensor
accessory required)42 = Part Load Variable Air DCV MicroTech for Remote Wall Sensor &
Wall CO2 (Sensor accessories required)
Part Load Variable Air MicroTech Control/Coil CombinationsField 9 Part Load Variable Air MicroTechField 6, 7 2 Pipe or 4 Pipe Water System Only
10. DischargeAJ = Front Discharge Duct Collar, 30 1/2" Length Unit (except S20,
H20)AU = Front Bar Grille Discharge, 30 1/2" Length Unit (except S20, H20)
AH = Front Discharge Duct Collar, 36" Length Unit (w/plenum)AT = Front Discharge Double Deflection Grille, 36" Length Unit (w/
plenum)BD = Down Discharge Double Deflection Grille, 40" Length Unit (w/
Field-Installed Accessories may accompany Unit Ventilator(s), ormay be shipped separately. These may include: Adapter Backs;Aluminum Louvers; Aluminum Grilles; Auxiliary Drain Pans; Controls/ Sensors; End Panels; Spare Filters; MicroTech Controls, Sensors(temperature, humidity, CO2); End of Cycle DDC Valve; ModulatingDDC Valves; Subbases. See instructions shipped with accessoriesand install according to these and the plans.
Unit Ventilator (Ceiling Type) Data Plate - Specific Information
Field 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Model U AHF 4 S07 A Z 65 R 19 AH 26 G W B 1
IM 725 (1-02) 33
See table 21 for dimension “A”
Typical Ceiling AH Unit Air Arrangements
Discharge Air Arrangements 301⁄2˝ (750 to 1500 CFM)
Discharge Air Arrangement 40˝ (750 to 2000 CFM)
Discharge Air Arrangements 36˝ (750 to 2000 CFM)
Figure 99 - Arrangement AJ Front Discharge With Duct Collar
Figure 98 - Arrangement AU Front Discharge With Bar Grille
301⁄2"(775mm)
36"(914mm)
73⁄4" (200mm)Max. Recess
16 5⁄8"(422mm)
301⁄2"(775mm)
301⁄2"(775mm)Shown With Return
Air Grille
13⁄4" (44mm)
7" (178mm) x A
3⁄4" (19mm)
77⁄8" (200mm)16 5⁄8"(422mm)
301⁄2"(775mm)
165⁄8"(422mm)
7" (178mm) x A
40" (1016mm)
AirFlow
AirFlow
AirFlow
Figure 101 - Arrangement AH Unit Mounted Plenum With Front Discharge Duct Collar
55⁄8" (143mm)
7" (178mm) x A
4" (102mm) 3⁄4" (19mm)
36"(914mm)
165⁄8"(422mm)
Shown With ReturnAir Grille
AirFlow
Figure 100 - Arrangement AT Unit Mounted Plenum With Front Discharge Double Deflection Grille
41⁄2"(114mm)
Max.Recess
165⁄8"(422mm)
36"(914mm)
36"(914mm)
Grille Finish IsClear AnodizedAluminumAir
Flow
NOTE:1. For all recessed applications (full or partial) it is necessary to carefully examine
both the inlet air and the discharge air physical locations. This must be donefor each location individually and in combination with each other to ensure theyare compatible with the specific installation.
2. Duct collars shipped loose for field installation not by AAF®-HermanNelson®.3. It is important also to verify there is sufficient clearance to open and remove
the bottom access panels and end panels for routine maintenance.4. All dimensions approximated.
Shown With ReturnAir Grille
40"(1016mm)
Grille Finish Is ClearAnodized Aluminum
Discharge Grille Detail
Grille Blades Curved To DirectAir Horizontally Along Ceiling
Figure 102 - Bottom Discharge With Double Deflection Grille
34 IM 725 (1-02)
Inlet Air Arrangements
Typical Ceiling AH Unit Air Arrangements (Continued)
NOTE:1. For all recessed applications (full or partial) it is necessary to carefully exam-
ine both the inlet air and the discharge air physical locations. This must bedone for each location individually and in combination with each other to en-sure they are compatible with the specific installation.
2. Duct collars shipped loose for field installation not by AAF®-HermanNelson®.3. It is important also to verify there is sufficient clearance to open and remove
the bottom access panels and end panels for routine maintenance.4. All dimensions approximated.
Pre-Installation ConsiderationsPrior to unit installation, be sure that the exterior wall openings andlouvers, as applicable, are ready and in accordance with the job plans.Horizontal Ceiling Models AHF, AHB, AHV and AHR ceiling unitsare typically installed in the ceiling with a variety of exposures,including completely exposed, partially exposed, partially or fullyrecessed, or completely concealed, (see figure 96). Each installationshould contain a properly sized louver that is designed to let in freshair while preventing water (such as driving rain) from getting past thelouver and into the unit itself. A weather-tight seal keeps unwanted airand moisture from entering the occupied space. See Figures 1 - 3 forvarious louver details. Follow typical installation methods for louversand flashing by others to prevent moisture and air infiltration damage.
Recess FlangesWith Unit ShownFully Recessed
Figure 108 - Fully Recessed Unit
The Cross Tee Must Be RemovableFor Access To Removable End
Duct Design For Noise ControlProper acoustics is often a design requirement for schools. Most of theproblems that are associated with HVAC generated sound can beavoided by properly selecting and locating the components of thesystem. There are some general do’s and don’ts:
The following suggestions can reduce the amount of sound thatreaches the occupied room:• Use flexible duct connections.• Make the discharge duct the same size as the unit discharge openingfor the first five feet.• Line the first 5 feet of the supply duct.• Make two 90-degree turns in the supply and return ducts.• Keep duct velocity low and follow good duct design procedures.• Mount and support the ductwork independent of the unit.• Line the first five feet of the return duct.• Locate the return air intake away from the unit discharge.• Provide multiple discharges.
• Restrict use of high pressure drop flexible ducting.• Size the outdoor air and return air ducts to handle 100% of the totalcfm to accommodate economizer or morning warm-up operation.
If a supply air duct with improper duct work is placed too closeto the unit discharge, it will result in substantial noise. Avoidsuch forms of connections when designing ductwork wheresound attenuation is critical. Figures 109 through 111 showssuggested duct considerations per SMACNA and ASHRAE.
Sound control applies to the return side of the duct design as well asthe supply side. Figure 110 illustrates suggested installation of return-air duct. Note the return air opening, and the sizing and changes indirection of the ductwork. Figure 111 illustrates suggested installationof outside air ducting.
Duct System Considerations
NOTICE
Flexible Boot
5 FeetSame Size AsUnit Discharge
Accoustically Lined
Two 90° Turns
Ductwork SizedBased On Airflow
Ductwork Supported Independent Of UnitUnit Ventilator Discharge
Accoustically LinedFlexible Boot
Ductwork Supported Independent Of Unit
Two 90° Turns
5 FeetSame Size AsUnit Return
Unit Ventilator Return
Figure 109 - Discharge Air Duct Work
Figure 110 - Intake/Return Air Duct Work
36 IM 725 (1-02)
Figure 113 - Install AH Ceiling Unit Flange
The following general suggestions are offered only to stresstheir importance; however, there are additional importantfactors that must be considered. Assistance in the design ofductwork can be found in the ASHRAE Handbook and SMACNApublications, as well as other recognized authorities.
NOTICE
Anchor the unit using the four unit mounting holes. The unit must besuspended from these holes (figure 112). Do not attempt to suspendthe unit at any other locations. When hanging the horizontal AH unitventilator, the unit should be level both front to back and side to side.This aids in condensate removal from the drain pan, and reduction ofsound. Use a 4' level to determine the unit is not twisted or pitched.
Ceiling Unit Ventilators can be mounted in an exposed position, in asoffit, partially recessed, fully recessed and concealed (see figure 96).For partially and fully recessed units, wall guard flanges are a standardaccessory to provide a finished appearance at the ceiling (figure 113).
Do not attach or hang the ceiling off of the unit ventilator.
Flexible Boot
5 FeetSame Size AsUnit Discharge
Accoustically Lined
Insulated Ductwork to PreventSweating, Heat Loss or Heat Gain
Unit VentilatorIntake
Louver
Outdoor Air
Figure 111 - Outdoor Air Intake and Insulated Duct Work
Assemble Recess Flange and then attach to ceiling T bar or plasterboard. Recess Flange must not make contact with unit, to preventtransmission of any vibration, (see figure 108 and 113).
Recess Flange
NOTICE
Note:36˝ horizontal clearance recommended at right end for service (24˝ minimum).Amount of recess must consider location of end panel fasteners. Recess flangesmust not interfere with access to these fasteners.
Figure 112 - Remove Ceiling Unit End Panels For Access To Mounting Holes
One-inch duct collars are provided for field duct attachment to thesupply-air outlet. The duct collars are field installed. Locate the unitventilator as close as practical to the outdoor air intake opening.Insulate the outdoor air duct to reduce sweating or temperature rise.
End Panel
Release End PanelFasteners To GainAccess To InteriorMounting Holes
Mountings Holes (4)
AH CeilingUnit Ventilator
7"(178mm)Without
End Panel
7"(178mm)
131/2"(343mm)
Step 3Anchoring The Ceiling Unit
IM 725 (1-02) 37
Figure 115 - Fully Recessed Unit
Safety Chains
FiltersSee page 25 for information. Model AH filter is removed by openingthe hinged access door, removing the sealing plate and then replacingthe filter, reinstalling the sealing plate and securing the access door,(see figure 115).
Suggested Condensate TrappingThe condensate trap provides for discharge of water from the unitventilator drain pan during the cooling mode, while the water seal(water level in the condensate trap), prevents the flow of air from theunit ventilator end compartment into the coil section during normaloperation.Improper trapping can lead to several problems. If the trap is too tall,negative pressure will prevent drainage, causing condensate backup.If the trap is too short the seal will be destroyed or nonexistent,producing the same effect as a non-trapped system.The trap should be constructed of 7/8" clear plastic piping. Thecondensate piping from the drain trap must be sloped to facilitateproper drainage. The clear plastic trap should be clamped and removablefor cleaning. It may be necessary to manually fill the trap at systemstart-up, or to run the unit for sufficient time to build a condensate seal.The condensate trap and condensate piping drainage should be free ofany foreign debris. Foreign debris can prevent proper operationresulting in condensate buildup.
A B C
Standard Static Pressure 11/4" 5/8" 23/4"
High Static 11/2" 3/4" 31/8"
Figure 114 - Recommended Condensate Piping
A
C
7/8" I.D. Clear Plastic
B
1/4" Flare by 1/2" MPT Half-Union and 1/4" Flare (by AAF-HermanNelson)
Tee (by Others)
Steam Trap (by Others)
Vacuum Breaker Tube(by AAF-HermanNelson)
Vacuum Breaker(by AAF-HermanNelson) Control Valve: Install on Center
Coil Connection
Figure 116 - Same End Connections - Model AH 68/69 Coils
Steam Supply
Steam Return
Note:Refer to front section of this installation manual for proper considerations on piping, coil connections, electrical, etc.
Table 22 - Condensate Drain Static Pressures
Step 4Make Piping Connections (see AV procedures beginning on page 12)
38 IM 725 (1-02)
Notes:1. The auxiliary contact of the Remote Speed Switch is closed at “HI” and “LO”
positions and open at “OFF” position.2. Refer to detailed wiring diagram furnished with unit for internal connections.3. Mount remote speed switch in UL listed outlet box. Class 1 Wiring (Both Field
Supplied).4. Remove wire 501 from Unit Ventilator speed switch “SW-2” terminal “T6” in
control box.5. Connect one side of auxiliary contact of the remote speed switch (Blk), to
terminal “T6” of speed switch. Connect the other side of the auxiliary contact(Blk) of the remote speed switch to wire 501.
6. Remove transformer “X1” connections Common (Blk), Hi (Brn), Med (Blu) andLo (Yel) from unit speed switch “SW-2” in Unit Ventilator control box.
7. a. If unit speed switch “SW-2” has Hi, Med and Lo terminals jumpered together,connect Hi speed (Brn Wire) to Hi (Yel Wire) and Lo (Blu Wire) of remote speedswitch. Using field supplied wire nuts cap the blue and yellow wires previouslyremoved from speed switch “SW-2”.
b. If speed switch “SW-2” does not have Hi (Brn), Med (Blu) and Lo (Yel) terminalsjumpered, connect as follows: common (Blk) to red on remote speed switch Hi(Brn) to Hi (Yel) on remote speed switch Lo (Yel) to Lo (Blu) on remote speedswitch. Cap Blue wire with field supplied wire nut.
8. Place label in suitable location for future use.
Figure 117 - Remote Two Speed Control Switch
All WiringClass 1
Motor SpeedTransformerConnected per
Unit Schematic
MBlk
Red
Blk
Red
501
500SW2
6 5
X1
Red
YelBrn
YelBrn
Blu
X1
Blu
Yel
YelBlu
Blk
Red
Blk
Off
LoHi
1
2
Blu
AuxiliaryContact
4 1⁄2" (114mm)
2 3⁄4"
(70mm)
UNIT CONTROL
OFFHI LO
FieldWiringbyOthers
Remote Speed Switch Unit Ventilator Switch Box LocatedIn Right Hand Compartment
6 " (152mm)Long Pigtails
Juction Box(By Others)
Step 5Make Electrical Connections
To avoid electrical shock, personal injury or death, be sure thatfield wiring complies with local and national fire, safety, andelectrical codes, and voltage to the system is within the limitsshown in the job-specific drawings and unit electrical dataplate(s).Power supply to unit must be disconnected when making fieldconnections. To avoid electrical shock, personal injury ordeath, be sure to rigorously adhere to field wiring proceduresregarding proper lockout and tagout of components.
WARNING!
Table 24 - Floor AH Electrical Data/Motor Data and Unit Amp
Unit CFM L/sESP Motor Unit Current #
Series (Nom.) in. H2O PA HP Watts 115V 208V 230V 265V
S07750 354
0.0-0.2 0-50 1/4 164 1.8 1.0 0.9 0.8
H07 0.21-0.45 52.5-112.5 1/2 239 2.0 1.1 1.0 0.9
S101000 472
0.0-0.2 0-50 1/4 244 3.1 1.7 1.5 1.3
H10 0.21-0.45 52.5-112.5 1/2 356 3.4 1.9 1.7 1.5
S131250 590
0.0-0.2 0-50 1/4 306 3.5 1.9 1.8 1.5
H13 0.21-0.45 52.5-112.5 1/2 447 3.8 2.1 1.9 1.7
S151500 708
0.0-0.2 0-50 1/4 334 3.7 2.0 1.8 1.6
H15 0.21-0.45 52.5-112.5 1/2 488 4.0 2.2 2.0 1.7
S202000 944
0.0-0.2 0-50 1/3 249 7.0 3.9 3.5 3.0
H20 0.21-0.45 52.5-112.5 1/2 373 7.6 4.2 3.8 3.3
# Amps at unit voltage, 60 Hz, single phase
Note:Unit wire sizing should be determined in accordance withNEC and local codes.* External static pressure ranges must be strictly
adhered to.
See Table 24, and Figures 82 - 87 and the job-specific electricaldrawings before proceeding with field power and control wiring. Seealso the wiring diagram provided on the unit ventilator right frontaccess panel.In addition, those unit ventilators equipped with optional electricheating coil have electric heating coil power connections at right endonly.
Instructions1. Provide power supply to right end compartment to match unit
nameplate.
2. Wire leads provided from unit ventilator electric connection boxto load side of unit power switch (switch provided by AAF).The junction box has 1"(25mm) and 2"(51mm) knockouts, located10-1/2"(267mm) from right end of unit.
3. Provide ground wire from grounding screw in switch junction boxto switch ground terminal.
4. Wire field power supply to line side of unit power switch. Wireground conductor to switch ground terminal.
5. Mount unit power switch in switch junction box and install switchcover plate (provided).
Note:On units with electric heat, the 2 pole unit power switch is replaced by a 3 pole switchand is mountd as shown in figure 82 page 26. (A) shows switch location for valvecontrol unitrs and (B), (C) and (D) show location for Face & Bypass control units. (B)is for 208, 230 and 265 volt vertical (AV) and horizontal (AH) units. (C) shows locationfor 460 volt vertical (AV) units and (D) shows location for 460 volt horizontal (AH) units.Also, on electric heat units with controls by others, wiring to the field mountedcontroller is done in the left end compartment. See specific wiring diagram for details.
CAUTION!Use copper conductors only. Use of aluminum conductors mayresult in equipment failure and overheating hazards. All wiringin right hand compartment must be class 1.
IM 725 (1-02) 39
Remove front access panels. Rotate fans manually, all parts should bealigned properly and move freely. Also, inspect fans for obstructions.
Installing Unit Ventilator End Panels:Align each end panel with the top and front edges of the ceiling unitventilator. Attach each end panel to the unit ventilator using thehardware provided.
Run the unit ventilator for ten minutes, listening and observing. Fansshould be operating correctly and rotating in proper direction, withoutunusual noise. Likewise, the unit should be free of sheet metal rattlesand / or unusual noises. All panels should be in place and properlyfastened, and checked for air leaks and condensation.
Step 6Prepare Unit Ventilator(s) for Start-up
Unit Ventilator Warranty Registration Form and Check, Test And Start Procedure
The check, test and start (Warranty Registration, Form 573882Y) must be completely filled out and returned to, AAF-HermanNelson WarrantyDepartment within ten days in order to comply with the terms of the AAF-HermanNelson warranty. Forms should be returned to AAF-HermanNelson Warranty Department, P.O. Box 9030, Auburn, NY 13021-9030.
IMPORTANT!
For trouble free operation, the filter must be cleaned or replaced on aregular basis. Dirty filters result in poor performance. To service filteropen hinged access door with 5/32" hex head wrench. Remove metalplate and change filter. Filters should be checked monthly or more ifconditions indicate.
Complete the check-start list and return to the AAF®-HermanNelson®
representative to start the warranty.
AAF®-HermanNelson® McQuay International will not be responsible for:
1. Shipping Damage2. Normal maintenance.3. Damage or repairs required as a consequence of faulty installation or application by others.4. Failure to start due to voltage conditions, blown fuses, open circuit breakers, or other damages due to the inadequacy or interruption of electrical
service.5. Controls supplied by others and improper operations/hook up of such that impact unit operation or performance.6. Damage or repairs needed as a consequence of any misapplication, abuse, improper servicing, unauthorized alteration, or improper operation.7. Damage as a result of floods, winds, fires, lightning, accidents, corrosive atmosphere, or other conditions beyond the control of AAF®-
HermanNelson® McQuay International .8. Parts not supplied or designated by AAF®-HermanNelson® McQuay International.9. AAF®-HermanNelson® McQuay International product installed outside the United States or Canada.10. Any special, indirect, consequential, property, or commercial damage of any nature whatsoever.
Limitations of WarrantyTHIS WARRANTY IS EXCLUSIVE AND IN LIEU OF IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY AND ALL OTHER WARRANTIES
EXPRESSED OR IMPLIED. THE REMEDIES PROVIDED FOR THIS WARRANTY ARE EXCLUSIVE AND SHALL CONSTITUTE THE ONLY LIABILITIES ON THE PART OF AAF®-HERMANNELSON® MCQUAY INTERNATIONAL.
For service or repair, follow these steps in order:
1. Contact the installing contractor.2. Contact the local AAF®-HermanNelson® McQuay International representative.3. Contact AAF®-HermanNelson® McQuay International directly.
One Year Warranty: This AAF®-HermanNelson® McQuay International product is warranted to be free from defects in material andworkmanship under normal use and maintenance for a period of one year from date of start-up not to exceed 18 months from date of shipment.A new or rebuilt part to replace any defective part will be without charge, provided the defective part is returned to the distributor. The replacementpart assumes the unused portion of the warranty.
This warranty does not include labor or other cost incurred for repairing, removing, installing, shipping, servicing, or handling either defectiveparts or replacement parts.
Model AV/AH – AAF®-HermanNelson® Unit Ventilator Limited Warranty
The information in this bulletin supersedes and replaces previous [catalogs][bulletins] with regard to AAF®-HermanNelson® unit ventilator products. Illustrations coverthe general appearance of AAF-HermanNelson unit ventilator products at the time of publication. AAF-HermanNelson reserves the right to make changes in designspecifications and construction at any time without notice.
