ze jv ,1_2008 Lennox industries Inc. Dallas, Texas, USA INSTALLATION INSTRUCTIONS XP14 Elite ® Series Units HEAT PUMP UNITS _]_Technical .ELL1 Publications 505,244M Litho U.S.A. 04108 Supersedes 11/07 RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE WARNING CAUTION A IMPORTANT A IMPORTANT XP14 Outdoor Unit ............................ 1 Shipping and Packing List ...................... 1 Unit Dimensions and Parts Arrangement ......... 2 General Information ........................... 3 Setting the Unit ............................... 3 Removing Panels ............................. 5 Electrical ..................................... 6 Refrigerant Piping ............................. 8 Flushing Existing Line Set and Indoor Coil ........ 10 Refrigerant Metering Device .................... 12 Manifold Gauge Set ........................... 13 Service Valves ................................ 13 Leak Testing .................................. 14 Evacuation ................................... 14 Start-Up ...................................... 15 Refrigerant Charge ............................ 15 Check Indoor Airflow before Charging ............ 15 Setup for Checking and Adding Charge .......... 16 Pre-Charge Maintenance Checks ................ 16 Weigh in Charge .............................. 17 Subcooling Charge ............................ 17 Defrost System ............................... 19 Maintenance .................................. 24 User Information .............................. 24 Start-up and Performance Checklist .............. 26 The XP14 outdoor unit uses HFC-410A HFC refrigerant. This unit must be installed with a matching indoor blower coil and line set as outlined in the Lennox Engineering Handbook, Elite® Series XP14 outdoor units are designed for use in check thermal expansion valve (CTXV) systems only and are not to be used with other refrigerant flow control devices. An expansion valve approved for use with HFC-410A must be ordered separately and installed prior to operating the unit, 1 - Assembled XP14 outdoor unit Check the unit components for shipping damage. If you find any damage, immediately contact the last carrier, 04/08 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,244M IIIIIIIIIIIIIIIIIIIIIIIIIIIIII
Transcript
ze jv ,1_2008 Lennox industries Inc.
Dallas, Texas, USA
INSTALLATIONINSTRUCTIONS
XP14 Elite ® Series Units
HEAT PUMP UNITS _]_Technical.ELL1 Publications
505,244M Litho U.S.A.04108Supersedes 11/07
RETAIN THESE INSTRUCTIONSFOR FUTURE REFERENCE
WARNING
CAUTION
A IMPORTANT
A IMPORTANT
XP14 Outdoor Unit ............................ 1Shipping and Packing List ...................... 1Unit Dimensions and Parts Arrangement ......... 2General Information ........................... 3Setting the Unit ............................... 3Removing Panels ............................. 5Electrical ..................................... 6Refrigerant Piping ............................. 8Flushing Existing Line Set and Indoor Coil ........ 10Refrigerant Metering Device .................... 12Manifold Gauge Set ........................... 13Service Valves ................................ 13Leak Testing .................................. 14Evacuation ................................... 14Start-Up ...................................... 15Refrigerant Charge ............................ 15Check Indoor Airflow before Charging ............ 15Setup for Checking and Adding Charge .......... 16Pre-Charge Maintenance Checks ................ 16Weigh in Charge .............................. 17Subcooling Charge ............................ 17Defrost System ............................... 19Maintenance .................................. 24User Information .............................. 24Start-up and Performance Checklist .............. 26
The XP14 outdoor unit uses HFC-410A HFC refrigerant.This unit must be installed with a matching indoor blowercoil and line set as outlined in the Lennox EngineeringHandbook, Elite® Series XP14 outdoor units are designedfor use in check thermal expansion valve (CTXV) systemsonly and are not to be used with other refrigerant flowcontrol devices. An expansion valve approved for use withHFC-410A must be ordered separately and installed priorto operating the unit,
1 - Assembled XP14 outdoor unit
Check the unit components for shipping damage. If youfind any damage, immediately contact the last carrier,
WARNING 4. Locate the unit so prevailing winter winds will not blowinto the coil.
5. Locate unit away from overhanging roof lines whichwould allow water or ice to drop on, or in front of, coilor into unit.
These instructions are intended as a general guide and donot supersede local codes in any way. Consult authoritieshaving jurisdiction before installation.When servicing or repairing HVAC components, ensurethe fasteners are appropriately tightened. Table 1 showstorque values for fasteners.
Table 1. Torque Requirements
Part Recommended Torque
Service valve cap 8 ft.- lb. 11 NM
Sheet metal screws 16 in.- lb. 2 NM
Machine screws #8 16 in.- lb. 2 NM
Compressor bolts 90 in.- lb. 10 NM
Gauge port seal cap 8 ft.- lb. 11 NM
CAUTION
Outdoor units operate under a wide range of weatherconditions; therefore, several factors must be consideredwhen positioning the outdoor unit.Position the unit to allow adequate airflow and servicingclearance. Maintain a minimum clearance of 24 inches(610 mm) between multiple units as illustrated in figure 1for installation clearances.
1. Place a sound-absorbing material, such as Isomode,under the unit if it will be installed in a location orposition that will transmit sound or vibration to theliving area or adjacent buildings.
2. Install the unit high enough above ground or roof toallow adequate drainage of defrost water and preventice build-up.
3. In heavy snow areas, do not locate unit the wheresnowdrifts will likely build. The unit base should beelevated above the depth of average snows.NOTE- Elevation of the unit may be accomplished byconstructing a frame using suitable materials. If asupport frame is constructed, it must not block drainholes in unit base.
NOTES:
Service clearance of 30 in, (762 mm) must be maintained onone of the sides adjacent to the control box.
Clearance to one of the other three sides must be 36 in. (914mm)
Clearance to one of the remaining two sides may be 12 in. (305mm) and the final side may be 6 in. (152 mm),
A clearance of 24 in, (610 mm) must be maintained betweentwo units.
48 in. (1219 mm) clearance required on top of unit,
Figure 1. Installation Clearances
SLAB MOUNTING
When installing unit at grade level, the top of the slabshould be high enough above grade so that water fromhigher ground will not collect around the unit. The slabshould have a slope tolerance away from the building of 2degrees or 2 inches per 5 feet (50 mm per 1500 mm) toprevent ice build-up under the unit during a defrost cycle.
NOTE - If necessary for stability, anchor unit to slab asdescribed in Stabilizing Unit on Uneven Surfaces on page4.
INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPETOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET[50 MM PER 1.5 M]) AWAY FROM BUILDING STRUCTURE.
.....1
BU,LD,NGSTRUCTURE
MOUNTING_ --7-SLAB
-/GROUND LEVEL
Figure 2. Slab Mounting Options
Page 3XP14 SERIES
ELEVATING THE UNIT (SMALL-BASE UNITS)If additional elevation is necessary, raise the unit byextending the length of the unit support feet. This may bedone by cutting four equal true-cut lengths of Schedule(SCH) 40, 4" (101.6mm) piping to the height required asillustrated in figure 3,
NOTE - Keep the height of extenders short enough toensure a sturdy installation, If it is necessary to extendfurther, consider a different type of field-fabricatedframework that is sturdy enough for greater heights.
The inside diameter of the 4" (101.6mm) piping isapproximately 0,25" (6.35mm) greater than thepre-installed feet on the unit. Devise a shim that will take upthe space and hold the extenders onto the feet during thisprocedure, Small strips of 0,125" (3.175mm) thickadhesive foam may be used, One or two small 1"(25,4mm) square strips should be adequate to hold theextender in place.
Base
Leg Detail 4" (101.6mm)
SCH 40 Piping
Figure 3. Elevated Slab Mounting using FeetExtenders (Small Base Units)
ELEVATING THE UNIT (LARGER-BASE UNITS)Unlike the small-base units which use round feet, thelarger-base units are outfitted with elongated feet asillustrated in figure 4. which uses a similar method forelevating the unit height,
If additional elevation is necessary, raise the unit byextending the length of the unit support feet, This may bedone with 2" SCH 40 female threaded adapter. Thespecified coupling will fit snuggly into the recess portion ofthe feet. Use additional 2" SCH 40 male threaded adaptorswhich can be threaded into the female threaded adaptorsto make additional adjustments to the level of the unit,
NOTE - Keep the height of extenders short enough toensure a sturdy instaflation, If it is necessary to extendfurther, consider a different type of field-fabricatedframework that is sturdy enough for greater heights.
Base
Leg Detail 2" (50.Smm)SCH 40
Female Threaded
Adapter
Figure 4. Elevated Slab Mounting using FeetExtenders (Larger Base Units)
STABILIZING UNIT ON UNEVEN SURFACESTo help stabilize an outdoor unit, some installations mayrequire strapping the unit to the pad using brackets andanchors commonly available in the marketplace.
TYPICAL i-LINSTALLATION __'-_WITH 3 TO 4 IN.EXTENDERS
INSTALLED _ BUILDING
IMPORTANT! STRUCTURE
ALWAYS USE MOUNTING _ ---FSTABILIZERBRACKET ON SLABELEVATEDINSTALLATIONS
STABILIZERBRACKETS
GROUND LEVEL
Figure 5. Elevated Slab Mounting using FeetExtenders
,& IMPORTANT
Page 4505244M 04/08
With unit positioned at installation site, remove two sideIouvered panels to expose the unit base pan. Install thebrackets as illustrated in figure 6 using conventional)ractices; replace the panels after installation is complete,
#101/2" LONGSELF-DRILLING SHEETMETAL SCREWS
COIL
STABILIZING BRACKET
(18 GAUGE METAL - 2"WIDTH; HEIGHT ASREQ'D)
#101-1/4" LONG HEXHD SCREW &FLATWASHER
BASE PAN
PLASTIC ANCHOR - USE IF CONCRETE
(HOLE DRILL 1/4"); NOT IF PLASTIC SLAB(HOLE DRILL 1/8").
l Deck Top
_J _ Mounting __STABILIZING MINIMUM 1
PERS'DE\2 L'I _:_ 'l'
ANGLE
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
Figure 6. Installing Stabilizer Brackets(Slab Side Mounting)
ROOF MOUNTINGInstall unit 6" (152 mm) above the roof surface to avoid icebuild-up around the unit. Locate the unit above a loadbearing wall or area of the roof that can adequately supportthe unit, Consult local codes for rooftop applications.
If unit cannot be located away from prevailing winter winds,construct a wind barrier sized at least the same height andwidth as outdoor unit, Position barrier 24" (610 mm) fromthe sides of the unit in direction of prevailing winds asillustrated in figure 7,
prevailing winter winds
r wind barrier I
24"
inlet air ,_ _641'0 mm)
inlet al_
4_ inlet air
O inlet air
Figure 7. Rooftop Application with Wind Barrier
Remove the Iouvered panels as follows:1, Remove two screws, allowing the panel to swing open
slightly as illustrated in figure 8,
2. Hold the panel firmly throughout this procedure.Rotate bottom corner of panel away from hinge cornerpost until lower three tabs clear the slots as illustratedfigure 8, Detail B.
3, Move panel down until lip of upper tab clears the topslot in corner post as illustrated in figure 8, Detail A.
Position and Install Panel--Position the panel almostparallel with the unit as illustrated in figure 9, Detail D onpage 6 with the screw side as close to the unit as possible,Then, in a continuous motion:
• slightly rotate and guide the lip of top tab inward asillustrated in figure 8, Details A and C; then upward intothe top slot of the hinge corner post,
• rotate panel to vertical to fully engage all tabs,
• holding the panel's hinged side firmly in place, closethe right-hand side of the panel, aligning the screwholes,
When panel is correctly positioned and aligned, insert thescrews and tighten,
IMPORTANT! Do not allow panels to hang on unit by top tab. Tabis for alignment and not designed to support weight of panel.
Panel shown slightly rotated to allow top tab to exit (or enter) topslot for removing (or installing) panel.
SCREW{OLES
LIP
DetailA
DetailB
iiiiiii+
ROTATE IN THIS DIRECTION;THEN DOWN TO REMOVE PANEL
Figure 8. Removing/Installing Louvered Panels(Details A, B and C)
In the U,S.A.. wiring must conform with current local codesand the current National Electric Code (NEC). In Canada,wiring must conform with current local codes and the currentCanadian Electrical Code (CEC),
Refer to the furnace or blower coil installation instructionsfor additional wiring application diagrams and refer to unitnameplate for minimum circuit ampacity and maximumovercurrent protection size,
1. Install line voltage power supply to unit from a properlysized unit disconnect switch,
2. Ground the unit at the unit disconnect switch or toearth ground.
3. To facilitate conduit, a hole is provided in the bottom ofthe control box, Connect conduit to the control boxusing a proper conduit fitting,
4. Units are approved for use only with copperconductors. (A complete unit wiring diagram islocated inside the unit control box cover.)
LINE VOLTAGEFIELD INSTALLED
WARNING! - ELECTRIC SHOCK HAZARD. Can cause INJU-RY or DEATH, Unit must be grounded in accordance withnational and local codes.
Z,/iXXNOTE - For use with copper conductors only. Refer to unitrating plate for minimum circuit ampacity and maximum over-current protection size.
Figure 10. Outdoor Unit Typical Field Wiring
NOTE - For proper voltages, select thermostat wiregauge per the following chart:
Table 2. Wire Run LengthsWire run length AWG # Insulation type
color-coded, temperaturerating 35°C minimum
less than 100' (30m) 18
more than 100' (30m) 16
5. Install room thermostat (ordered separately) on aninside wall approximately in the center of theconditioned area and 5 feet (1.5 m) from the floor. Itshould not be installed on an outside wall or where itcan be affected by sunlight, drafts or vibrations,
6. Install low voltage wiring from outdoor to indoor unitand from thermostat to indoor unit, See figures 11 and12 on page 7,
NOTE - 24V, Class II circuit connections are made in thelow voltage junction box,)
FOR _ WITH COPPER CONDUCTORSORLY.RERERTO UNIT RATIN6PLATE FOR ¥INIMII_I CII_IITA_PACITY ANOgAXINUff OVER-
CtI_NT RqOTECTION SIZE
,6_ REFER TO COMPRESSORIN U_IT
OR DEATH.UNIT MI_T B_ OR(X/NOEDIN_ITH NATION_. AND LOCALCO_S,
m_ SENSOR,OmOOOR_ve (_m_L)
r- -- --
I F----
III
II.IJ
,r=, C831 lily
x_2av
_3)"1
._&,?_-- [.--.__
®-I-----@-I-----@-I----
OUT
OPS
f2 OUT
;0M
fl OUT
-PS
KIC_SSORCONTACTOR
LIREVERSING
VAL_
®A2 SIGNATURE
81MZ8
T_ISTED
D
-Jl'-- --t-- d
--J
Figure 13. Typical XP14 Wiring
Page 7XP14 SERIES
A IMPORTANT
If the XP14 unit is being installed with a new indoor coil andline set, the plumbing connections should be made asoutlined in this section. If an existing line set and/or indoorcoil is going to be used to complete the XP14 system, referto the following section that includes flushing procedures.
Field refrigerant piping consists of liquid and vapor linesfrom the outdoor unit (sweat connections) to the indoor coil(flare or sweat connections). Use Lennox L15 (sweat,non-flare) series line sets as shown in table 3 or usefield-fabricated refrigerant lines. Refer to RefrigerantPiping Guide (Corp. 9351-L9) for proper size, type, andapplication of field-fabricated lines. Valve sizes are alsolisted in table 3.
REFRIGERANT LINE CONNECTIONS - XP14OUTDOOR UNIT MATCHED WITH NEW INDOORCOIL AND LINE SETIf replacing an existing coil equipped with a liquid linefunctioning as a metering orifice, replace the liquid lineprior to installing the XP14 unit. Line sets are described intable 3.
Model
Table 3. Refrigerant Line Sets
Valve FieldConnections
Liquid VaporLine Line
-0183/8 in. 3/4 in
-024 (10 mm) (19 mm)-030
-0363/8 in. 7/8 in
-042 (10 mm) (22 mm)-048
3/8 in, 1-1/8 in.-060 (10 ram) (29 ram)
Recommended Line Set
Liquid Vapor L15Line Line Line Sets
3/8 in. 3/4 in L15-41(10 (19 mm) 15 ft, - 50 ft.mm) (4.6 m - 15 m)
3/8 in. L15-65(10 7/8 inmm) (22 mm) 15 ft, - 50 ft.(4.6 m - 15 m)
3/8 in, 1-1/8 in. Field(10 (29 mm) Fabricatedmm)
NOTE - When installing refrigerant lines, refer to LennoxRefrigerant Piping Guide (Corp. 9351-L9) or LennoxTechnical Support Department Product AppficafionsGroup for assistance. In addition, be sure to consider thefollowing points:
• Select line set diameters from table 3 to ensure that oilreturns to the compressor.
• Unitsaredesignedforlinesetsofupto50feet(15m);for longer line sets, consult piping guidelines.
INSTALLING REFRIGERANT LINEPay close attention to line set isolation during installation ofany heat pump or a/c system. When properly isolated frombuilding structures (walls, ceilings, floors), the refrigerantlines will not create unnecessary vibration and subsequentnoises. Also, consider the following when placing andinstalling a high-efficiency outdoor unit:
1, Placement--Some localities are adopting soundordinances based on the unit's noise level observedfrom the adjacent property, not from the installationproperty, Install the unit as far as possible from theproperty line. When possible, do not install the unitdirectly outside a window. Glass has a very high levelof sound transmission. Figure 14 shows how to placethe outdoor unit and line set,
Install unit _ \_\away from //windows _
zz'.11111I I I I I I I IIIrb---.
will reduce line set vibration.
Figure 14. Outside Unit Placement
2. Line Set Isolation--The following illustrationsdemonstrate procedures which ensure properrefrigerant line set isolation.
• Figure 15 on page 9 shows how to install line setson horizontal runs.
• Figure 16 on page 9 shows how to install line setson vertical runs.
• Figure 17 on page 10 shows how to make atransition from horizontal to vertical
Page 8505244M 04/08
To hang line set from joist or rafter,use either metal strapping materialor anchored heavy nylon wire ties.
STRAPPING MATERIAL(Around vapor line only)
8 feet
FLOOR JOIST ORROOF RAFTER
r\
/ /
WIRE TIE(Around vapor line only)
TAPE OR8 feet WIRE TIE Strap the vapor line to the joist or
rafter at 8 ft. intervals then strapthe liquid line to the vapor line.
METAL FLOOR JOIST ORSLEEVE ROOF RAFTER
TAPE OR WIRE TIE
Figure 15. Refrigerant Line Sets: Installing Horizontal Runs
NOTE - Similar installation practices should be used if line set is to be installed on exterior of outside wall.OUTSIDE WALL IMPORTANT - Refrigerant
lines must not contact wall. VAPOR LINE LIQUID LINE
IMPORTANT!
Refrigerantlines mustnot contactstructure.
VAPOR LINE WRAPPED
[_ CAULK
PVC PiPE FIBERGLASSiNSULATiON
-_. WIRE TIE
INSIDE WALL
- STRAP
SLEEVE
WIRE TIE
_" .---------WOOD BLOCK
.___---- WIRE TIE
STRAP
SLEEVE
Figure 16. Refrigerant Line Sets: Installing Vertical Runs (New Construction Shown)
Page 9XP14 SERIES
ANCHOREDHEAVY NYLON
WIRE TIE
AUTOMOTIVEMUFFLER-TYPE
HANGER
WALLSTUD
WALLSTUD
Strap LiquidLine To Va- Strap Liquid Linepor Line To Vapor Line
UID LINE LIQUID LINE
METAL VAPOR LINE - WRAPPED METAL VAPOR LINE - WRAPPEDSLEEVE IN ARMAFLEX SLEEVE IN ARMAFLEX
Figure 17. Refrigerant Line Sets: Transition from Vertical to Horizontal
IWARNING NOTE - The tube end must stay bottomed in the fittingduring final assembly to ensure proper seating,sealing and rigidity,
5. Install a field-provided check expansion valve(approved for use with HFC-410A refrigerant) in theliquid line at the indoor coil,
BRAZING CONNECTION PROCEDURE
1, Cut ends of the refrigerant lines square (free fromnicks or dents), Debur the ends. The pipe must remainround; do not pinch end of the line.
2, Flow dry nitrogen through the refrigerant piping whilemaking line set connections; this prevents carbondeposits (oxidation) buildup on the inside of the jointsbeing brazed. Such buildup may restrict refrigerantflow through screens and metering devices, To do this:
Flow regulated nitrogen (at 1 to 2 psig) through therefrigeration gauge set into the Schrader portconnection on the vapor service valve and out ofthe Schrader port connection on the liquid servicevalve. (Metering device (CTXV and RFC) willallow low pressure nitrogen to flow through thesystem,)
While nitrogen is flowing, braze refrigerant line setto the indoor and outdoor units, IMPORTANT" Theflow of nitrogen must have an escape pathother than through the joint to be brazed.
3. Use silver alloy brazing rods (5 or 6 percent minimumsilver alloy for copper-to-copper brazing or 45 percentsilver alloy for copper-to-brass or copper-to-steelbrazing) which are rated for use with HFC-410Arefrigerant,
4, Wrap a wet cloth around the valve body and the coppertube stub to protect it from heat damage duringbrazing. Wrap another wet cloth underneath the valvebody to protect the base paint,
Xk IMPORTANT
kWARNING
Page 10505244M 04/08
CAUTION
EQUIPMENT REQUIRED FOR FLUSHING LINE SETThe following equipment is required to flush the existingline set and indoor coil:
• two clean HCFC-22 recovery cylinders
• oilless recovery machine with a pump down feature
• gauge set for HCFC-22 refrigerant
• gauge set for HFC-410A refrigerant (see ManifoldGauge Set section on page 13),
FLUSHING PROCEDURE1, Remove existing HCFC-22 refrigerant using the
following, applicable procedure as illustrated in figure18:
If the existing outdoor unit is not equipped withshut-off valves, or if the unit is not operationalAND you plan to use the existing HCFC-22refrigerant to flush the system -
• Disconnect all power to the existing outdoor unit,• Connect to the existing unit, a clean recovery
cylinder and the recovery machine according tothe instructions provided with the recoverymachine,
• Remove all HCFC-22 refrigerant from the existingsystem. Check gauges after shutdown to confirmthat the entire system is completely void ofrefrigerant.
• Disconnect the liquid and vapor lines from theexisting outdoor unit.
If the existing outdoor unit is equipped withmanual shut-off valves AND you plan to use NEWHCFC-22 refrigerant to flush the system -
,
,
,
• Start the existing HCFC-22 system in the coolingmode and close the liquid line valve.
• Pump all of the existing HCFC-22 refrigerant backinto the outdoor unit. (It may be necessary tobypass the low pressure switches to ensurecomplete refrigerant evacuation.)
• When the low side system pressures reach 0 psig,close the vapor line valve.
• Disconnect all power to the existing outdoor unit.Check gauges after shutdown to confirm that thevalves are not allowing refrigerant to flow back intothe low side of the system.
• Disconnect the liquid and vapor lines from theexisting outdoor unit,
Remove the existing outdoor unit, Set the newHFC-410A unit and follow the Brazing ConnectionProcedure provided on page 10 to make line setconnections. DO NOT install HFC-410Acheck/expansion valve at this time.
Make low voltage and line voltage connections to thenew outdoor unit. DO NOT turn on power to the unitor open the outdoor unit service valves at thistime.
Remove the existing HCFC-22 refrigerant flow controlorifice or check expansion valve before continuing withflushing procedures. HCFC-22 flow control devices(fixed orifice/check expansion valve) are not approvedfor use with HFC-410A refrigerant and may preventproper flushing. Use a field-provided fitting toreconnect the lines,
IMPORTANT
Inverted HCFC-22 Cylinder(Contains clean HCFC-22 to beused for flushing)
RECOVERY CYLINDER
EXISTING VAPOR LINE
VAPOR LINESERVICE VALVE
EXISTING LIQUID LINE LIQUID LINESERVICE VALVE
Tank ReturnInlet
, Discharge
RECOVERY MACHINE
Low HighPressure Pressure
Opened ! ! Closed
NOTE - The inverted HCFC-22 cylinder mustcontain at least the same amount of refrigerantas was recovered from the existing system.
Figure 18. Flushing Connections
Page 11XP14 SERIES
5. Remove the pressure tap valve cores from the XP14unit's service valves. Connect an HCFC-22 cylinderwith clean refrigerant to the vapor service valve,Connect the HCFC-22 gauge set to the liquid line valveand connect a recovery machine with an emptyrecovery tank to the gauge set.
6. Set the recovery machine for liquid recovery and startthe recovery machine. Open the gauge set valves toallow the recovery machine to pull a vacuum on theexisting system line set and indoor coil.
7. Invert the cylinder of clean HCFC-22 and open itsvalve to allow liquid refrigerant to flow into the systemthrough the vapor line valve. Allow the refrigerant topass from the cylinder and through the line set and theindoor coil before it enters the recovery machine,
8. After all of the liquid refrigerant has been recovered,switch the recovery machine to vapor recovery so thatall of the HCFC-22 vapor is recovered. Allow therecovery machine to pull a vacuum on the system,
NOTE - A single system flush should remove all of themineral oil from the existing refrigerant lines andindoor coil, A second flushing may be done (usingclean refrigerant) if insufficient amounts of mineral oilwere removed during the first flush. After eachsystem flush, allow the recovery machine to pull avacuum on the system at the end of theprocedure.
9. Close the valve on the inverted HCFC-22 drum andthe gauge set valves. Pump the remaining refrigerantout of the recovery machine and turn the machine off.
10. Use dry nitrogen to break the vacuum on therefrigerant lines and indoor coil before removing therecovery machine, gauges and HCFC-22 refrigerantdrum. Reinstall pressure tap valve cores into XP14unit's service valves.
11. Install check expansion valve (approved for use withHFC-410A refrigerant) in the liquid line at the indoorcoil.
XP 14 units may be used in check thermal expansion valve(CTXV) systems only. See indoor coil installationinstructions and the Lennox engineering handbook forapproved HFC-410A valve match-ups and applicationinformation,
NOTE - HFC-410A systems will not operate properly withan HCFC-22 valve,
Check thermal expansion valves equipped with fittings areavailable from Lennox, Refer to the EngineeringHandbook for applicable expansion valves for use withspecific match-ups, See table 4 for applicable indoor checkexpansion valve kits.
On smaller lines, 1/2" & smallerbo,bmaybe•mounted on top
_ _g
Do not mount bulbon bo{tom of line
5/8" & largersuction line
NOTE - If necessary, removeHCFC-22 flow control device(fixed orifice/check expansionvalve) from existing line set beforeinstalling HFC-410A approved ex-pansion valve and o-ring.
Figure 19. Metering Device Installation
IMPORTANT
If you install a check thermal expansion valve with anindoor coil that includes a fixed orifice, remove the orificebefore the check expansion valve is installed. See figure19 for installation of the check expansion valve.
Page 12505244M 04/08
CHECKEXPANSIONVAL_
LOW HUGHPRESSUREPRESSURE
DISTRIBUTOR
BIFLOWFILTEDRIER OUTDOOR
COIL
COMPRESSORv
OUTDOOR UNiT
REVERSING VALVE
VAPOR
/APORSERVICE .INE
POR_ /ALVE
CHECK EXPANSION VALVE --
NOTE- Use gauge ports on vapor line valve and liquid valve for evacuating refrigerantlines and indoor coil. Use vapor gauge port to measure vapor pressure during charging.
NOTE - ARROWS INDICATEDIRECTION OF REFRIGERANT FLOW
Manifold gauge sets used with systems charged withHFC-410A refrigerant must be capable of handling thehigher system operating pressures. The gauges should berated for use with pressures of 0 - 800 on the high side anda low side of 30" vacuum to 250 psi with dampened speedto 500 psi. Gauge hoses must be rated for use at up to 800psi of pressure with a 4000 psi burst rating.
The service valves and gauge ports are used for leaktesting, evacuating, charging and checking charge. Eachvalve is equipped with a service port which has afactory-installed Schrader valve. A service port capprotects the Schrader valve from contamination andserves as the primary leak seal.To Access Schrader Port:
1. Remove service port cap with an adjustable wrench.
2. Connect gauge to the service port.3. When testing is completed, replace service port cap.
Tighten finger tight, then torque per table 1 on page 3.
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.2. Use a service wrench with a hex-head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-linevalve sizes) to back the stem out counterclockwise asfar as it will go.
3. Replace the stem cap. Tighten finger tight, then torqueper table 1 on page 3.
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.2. Use a service wrench with a hex-head extension
(3/16" for liquidqine valve sizes; 5/16" for vapor-linevalve sizes) to turn the stem clockwise to seat thevalve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight, then torqueper table 1 on page 3.
STEM INSERT HEXSCHRADER CAP
VALVE ]OPEN TOLINE SET WHENVALVE IS CLOSED ",LLJ
]FRONT SEATED)] _
OUT-DOORCOl
SERVICEPORT CAP
_VALVE FRONT-SEATED)
Valve in closed position
WRENCH HERE,
/
Valve in open position
Figure 21. Front-Seated Liquid Line Valve
Vapor Line Ball Valve
Ball-type service valves as illustrated in figure 22 functionthe same way as the other valves but cannot be rebuilt; ifone fails, replace with a new valve. The ball valve isequipped with a service port with a factory-installedSchrader valve. A service port cap protects the Schradervalve from contamination and assures a leak-free seal.
STEMCAP
USE ADJUSTABLE WRENC
TO OPEN: ROTATE STEM _STEMCOUNTER-CLOCKWISE 90 °.
TO CLOSE: ROTATE STEM
CLOCKWISE 90° .
TOOUTDOORCOIL
BALL (SHOWN
SERVICE PORT
(_SCHRADER VALVETOINDOO
R COIL SERVICE
PORT CAP
Figure 22. Bali-Type Vapor Valve (Valve Closed)
Page 13XP14 SERIES
After the line set has been connected to the indoor andoutdoor units, check the line set connections and indoorunit for leaks.
WARNING
, WARNING [
WARNING I
USING AN ELECTRONIC LEAK DETECTOR
IMPORTANT
1. Connect a cylinder of HFC-410A to the center port ofthe manifold gauge set,
2. With both manifold valves closed, connect the cylinderof HFC-410A refrigerant, Open the valve on theHFC-410A cylinder (vapor only),
3. Open the high pressure side of the manifold to allowHFC-410A into the line set and indoor unit, Weigh ina trace amount of HFC-410A. [A trace amount is amaximum of 2 ounces (57 g) refrigerant or 3 pounds(31 kPa) pressure]. Close the valve on the HFC-410Acylinder and the valve on the high pressure side of themanifold gauge set, Disconnect HFC-410A cylinder.
4. Connect a cylinder of dry nitrogen with a pressureregulating valve to the center port of the manifoldgauge set,
5. Connect the manifold gauge set high pressure hose tothe vapor valve service port, (Normally, the high
.
7,
pressure hose is connected to the liquid line port;however, connecting it to the vapor port better protectsthe manifold gauge set from high pressure damage,)Adjust dry nitrogen pressure to 150 psig (1034 kPa),Open the valve on the high side of the manifold gaugeset in order to pressurize the line set and the indoor unit.After a few minutes, open a refrigerant port to ensurethe refrigerant you added is adequate to be detected.(Amounts of refrigerant will vary with line lengths.)Check all joints for leaks. Purge dry nitrogen andHFC-410A mixture. Correct any leaks and recheck.
Evacuating the system of noncondensables is critical forproper operation of the unit. Noncondensables are definedas any gas that will not condense under temperatures andpressures present during operation of an air conditioningsystem. Noncondensables and water vapor combine withrefrigerant to produce substances that corrode copperpiping and compressor parts.
IMPORTANT
1. Connect manifold gauge set to the service valve portsas follows:
• low pressure gauge to vapor line service valve• high pressure gauge to liquid line service valve
2. Connect micron gauge.
3. Connect the vacuum pump (with vacuum gauge) tothe center port of the manifold gauge set,
4. Open both manifold valves; start thevacuum pump,
5. Evacuate the line set and indoor unit to an absolutepressure of 23,000 microns (29,01 inches ofmercury). During the early stages of evacuation, it isdesirable to close the manifold gauge valve at leastonce to determine if there is a rapid rise in absolutepressure, A rapid rise in pressure indicates arelatively large leak, If this occurs, repeat the leaktesting procedure,
NOTE - The term absolute pressure means the totalactual pressure within a given volume or system,above the absolute zero of pressure. Absolutepressure in a vacuum is equal to atmosphericpressure minus vacuum pressure,
6. When the absolute pressure reaches 23,000 microns(29.01 inches of mercury), close the manifold gaugevalves, turn off the vacuum pump and disconnect themanifold gauge center port hose from vacuum pump.Attach the manifold center port hose to a dry nitrogencylinder with pressure regulator set to 150 psig (1034kPa) and purge the hose. Open the manifold gaugevalves to break the vacuum in the line set and indoorunit, Close the manifold gauge valves.
Page 14505244M 04/08
Xk WARNING
7. Shut off the dry nitrogen cylinder and remove themanifold gauge hose from the cylinder. Open themanifold gauge valves to release the dry nitrogen fromthe line set and indoor unit,
8. Reconnect the manifold gauge to the vacuum pump,turn the pump on, and continue to evacuate the line setand indoor unit until the absolute pressure does notrise above 500 microns (29.9 inches of mercury) withina 20-minute period after shutting off the vacuum pumpand closing the manifold gauge valves.
9. When the absolute pressure requirement above hasbeen met, disconnect the manifold hose from thevacuum pump and connect it to an upright cylinder ofHFC-410A refrigerant, Open the manifold gaugevalves to break the vacuum from 1 to 2 psig positivepressure in the line set and indoor unit, Close manifoldgauge valves and shut off the HFC-410A cylinder andremove the manifold gauge set,
power company has been consulted and the voltagecondition has been corrected.
6. Set the thermostat for a cooling demand. Turn onpower to indoor blower unit and close the outdoor unitdisconnect to start the unit.
7. Recheck voltage while the unit is running. Power mustbe within range shown on the nameplate.
A IMPORTANT
This system is charged with HFC-410A refrigerant whichoperates at much higher pressures than HCFC-22. Therecommended check expansion valve is approved for usewith HFC-410A. Do not replace it with a valve that isdesigned to be used with HCFC-22. This unit is NOTapproved for use with coils that include metering orifices orcapillary tubes,Units are factory-charged with the amount of HFC-410Arefrigerant indicated on the unit rating plate. This charge isbased on a matching indoor coil and outdoor coil with 15 ft.(4,6 m) line set. For varying lengths of line set, refer to table3 for refrigerant charge adjustment, A blank space isprovided on the unit rating plate to list the actual fieldcharge.
IMPORTANT
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory- and field-installed wiring for looseconnections,
NOTE - After the system has been evacuated and beforecompleting all the remaining start-up steps, this is the idealtime to adjust the amount of refrigerant made necessary byline set length difference and by the specific indoor unitmatch-up, Skip to the paragraph "Setup for Checking andAdding Charge" on page 16 to setup for charging and fordetermining if charge is needed; adjust the chargeaccordingly3. Open the liquid line and vapor line service valves
(counterclockwise) to release refrigerant charge(contained in outdoor unit) into the system,
4. Replace stem caps and secure finger tight, thentighten an additional (1/6) one-sixth of a turn,
5. Check voltage supply at the disconnect switch. Thevoltage must be within the range listed on the unitnameplate. If not, do not start the equipment until the
A IMPORTANT
NOTE - Be sure that filters and indoor and outdoor coils are
clean before testing,
COOLING MODE INDOOR AIRFLOW CHECK
Check airflow using the Delta-T (DT) process (figure 23).
HEATING MODE INDOOR AIRFLOW CHECK
Blower airflow (CFM) may be calculated by energizingelectric heat and measuring:
• temperature rise between the return air and supply airtemperatures at the indoor coil blower unit,
• voltage supplied to the unit,
• amperage being drawn by the heat unit(s),
Then, apply the measurements taken in following formulato determine CFM:
Amps x Voltsx 3.41CFM =
1.08 x Temperature rise (F)
Check indoor airflow using the step procedures asillustrated in figure 23.
All temperatures are INDOOR WETexpressed in °F COIL BULB_6
Step 1. Determine the desired DT--Measure entering air tempera-ture using dry bulb (A) and wet bulb (B) DT is the intersecting value ofA and B in the table (see triangle)
Step 2. Find temperature drop across ceil--Measure the coil's drybulb entering and leaving air temperatures (A and C). TemperatureDrop Formula: (TDrop) = A minus C.
Step 3. Determine if fan needs adjustment--If the difference be-tween the measured TDrop and the desired DT (TDropiDT) is within+3 °, no adjustment is needed. See examples: Assume DT = 15 and Atemp. = 72 °, these C temperatures would necessitate stated actions:
58° 14 15 = -1 (within +3 ° range) no change62 ° 10 15 = -5 Decrease the airflow
Step 4. Adjust the fan speed--See indoor unit instructions to in-crease/decrease fan speed
Changing air flow affects all temperatures; recheck temperatures toconfirm that the temperature drop and DT are within +3 °.
Figure 23. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart
SETUP FOR CHARGING
Connect the manifold gauge set to the unit's service ports(see figure 20):
• low pressure gauge to vapor service port
• high pressure gauge to liquid service port
Close manifold gauge set valves. Connect the centermanifold hose to an upright cylinder of HFC-410A,
CALCULATING CHARGE
If the system is void of refrigerant, first, locate and repairany leaks and then weigh in the refrigerant charge into theunit, To calculate the total refrigerant charge:
Amount Adjust amt. for Additional chargespecified variation in specified peron line set length indoor unit match-up Totalnameplate (table 6) (table 7) charge
+ + =
Page 16505244M 04/08
IMPORTANT
Table 5. Normal Operating Pressures - Liquid +10 and Vapor +5 PSIG* (Cooling)XP14-018 XP14-024 XP14-030 XP14-036 XP14-042 XP14-048 XP14-060
*IMPORTANT--These are most popular match-up pressures. Indoor match up, indoor air quality, and indoorload cause pressures to vary.
**Temperature of the air entering the outside coil.
1. Recover the refrigerant from the unit,
2. Conduct leak check; evacuate as previously outlined,
3, Weigh in the unit nameplate charge plus any chargerequired for line set differences from 15 feet and anyextra indoor unit match-up amount per table 7, (Ifweighing facilities are not available, use thesubcooling method,)
Table 6. Charge per Line Set Lengths
Liquid Line Oz. per 5 ft. (g per 1.5m) adjust fromSet Diameter 15 ft. (4.6m) line set*
3/8 in. (9.5mm) 3 ounce per 5 ft. (85g per 1.5m)
NOTE - *if line length is greater than 15 ft. (4.6 m), add this amount, Ifline length is less than 15 ft. (4.6 m), subtract this amount.
Requirements--these items are required for charging:
• Manifold gauge set connected to unit.
• Thermometers for measuring outdoor ambient, liquidline, and vapor line temperatures,
When to use cooling mode--When outdoortemperature is 60°F (15°C) and above, use cooling modeto adjust charge,
When to use heating mode--When the outdoortemperature is below 60°F (15°C), use the heating mode toadjust the charge,
Adding Charge for Indoor Match-Up--Table 7 lists allthe Lennox recommended indoor unit matches along withthe charge levels for the various sizes of outdoor units,
Page 17XP14 SERIES
Use!___ ___ cooling
mode_ 60°F (15°C) - +use_I heating
mode
Table 7. Adding Charge per Indoor Unit Match using Subcooling Method
1 Check the airflow as illustrated in figure 23 on page 16 to be sure the indoor airflow is asrequired. (Make any air flow adjustments before continuing with the following procedure.)
2 Measure outdoor ambient temperature; determine whether to use cooling mode orheating mode to check charge.
3 Connect gauge set.4 Check Liquid and Vapor line pressures. Compare pressures with Normal Operating
Pressures table 5, (Table 5 is a general guide. Expect minor pressure variations.Significant differences may mean improper charge or other system problem. )
5 Set thermostat for heat/cool demand, depending on mode being used:Using cooling mode--When the outdoor ambient temperature is 60°F (15°C) and above.Target subcooling values in table below are based on 70 to 80°F (21-27°C) indoor returnair temperature; if necessary, operate heating to reach that temperature range; then setthermostat to cooling mode setpoint to 68°F (20°C). When pressures have stabilized,continue with step 6.
Using heating mode--When the outdoor ambient temperature is below 60°F (15°C).Target subcooling values in table below are based on 65-75°F (18-24°C) indoor return airtemperature; if necessary, operate cooling to reach that temperature range; then setthermostat to heating mode setpoint to 77°F (25°C). When pressures have stabilized,continue with step 6.
9 Compare SC ° results with table below, being sure to note any additional charge for lineset and/or match-up.
10 If subcooling value is greater than shown in table, remove refrigerant; if less than shown,add refrigerant.
11 If refrigerant is added or removed, repeat steps 5Subcool Target
The demand defrost controller measures differential
temperatures to detect when the system is performingpoorly because of ice build-up on the outdoor coil, Thecontroller self-calibrates when the defrost system startsand after each system defrost cycle. The defrost controlboard components are shown in figure 24,
The control monitors ambient temperature, outdoor coiltemperature, and total run time to determine when adefrost cycle is required. The coil temperature probe isdesigned with a spring clip to allow mounting to the outsidecoil tubing. The location of the coil sensor is important forproper defrost operation.
NOTE - The demand defrost board accurately measuresthe performance of the system as frost accumulates on theoutdoor coil. This typically will translate into longer runningtime between defrost cycles as more frost accumulates onthe outdoor coil before the board initiates defrost cycles.
SERVICE LIGHT OPERATIONThe thermostat is not included with the unit and must bepurchased separately. Some outdoor thermostatsincorporate isolating contacts and an emergency heatfunction (which includes an amber indicating light), Theservice light thermostat will enable the emergency heatlight function on the room thermostat,
EMERGENCY HEAT (AMBER LIGHT)An emergency heat function is designed into some roomthermostats. This feature is applicable when isolation ofthe outdoor unit is required, or when auxiliary electric heatis staged by outdoor thermostats. When the roomthermostat is placed in the emergency heat position, theoutdoor unit control circuit is isolated from power andfield-provided relays bypass the outdoor thermostats. Anamber indicating light simultaneously comes on to remindthe homeowner that he is operating in the emergency heatmode.
Emergency heat is usually used during an outdoor unitshutdown, but it should also be used following a poweroutage if power has been off for over an hour and theoutdoor temperature is below 50°F (10°C). System shouldbe left in the emergency heat mode at least six hours toallow the crankcase heater sufficient time to preventcompressor slugging,
FILTER DRIER
The unit is equipped with a large-capacity biflow filter drierwhich keeps the system clean and dry, If replacement isnecessary, order another of the same design and capacity.The replacement filter drier must be suitable for use withHFC-410A refrigerant,
DEFROST CONTROL BOARD
Figure 24 provides a basic illustration of the layout of thedefrost control board. Table 9 provides informationconcerning pin-out and jumper configurations,
Note - Component Locations Vary by Board Manufacturer.TEST PINS
Table 9. Defrost Control Board DescriptionID Description
O Out 24 VAC output connection for reversing valve
LO-PS Connection for low-pressure switch
Y2 24 VAC output for second stage compressor solenoid
Y1 24 VAC common output, switched for enabling compressorcontactor
HI-PS Connection for high-pressure switch
P1 Seven position square pin header. P1 provides selection ofthe defrost terminate temperature based on the position ofselection shunt, as well as selection pins for enabling thefield test mode.
P2 The following connections are provided in the seven posi-tion P2 screw terminal block:
Wl 24 VAC thermostat output for auxiliary heat op-eration
C 24 VAC system common
L Service light thermostat connection
R 24 VAC system power input
Y2 24 VAC thermostat input for second stage com-pressor operation
O 24 VAC thermostat input for reversing valve op-eration
Y1 24 VAC thermostat input for first stage compres-sor operation
P3 Five position square pin header. P3 provides selection ofthe Y2 compressor lock-in temperature. Note: This is ap-plicable for two stage compressor operations only.
P4 Six position square pin header. P4 provides connections forthe temperature sensors:
COIL (P4-5) Ground connection for outdoor coil tem-perature sensor.(P4-6) Connection for outdoor coil temperaturesensor
AMB (P4-3) Ground connection for outdoor ambienttemperature sensor.(P4-4) Connection for outdoor ambient tempera-ture sensor.
DIS (P4-1) Ground connection for discharge temper-ature sensor.(P4-2) Connection for discharge temperaturesensor. Note: This is applicable for two stagecompressor operations only.
P5 Two position square pin header. P5 provides selection ofthe 30-second compressor delay option.
P6 Eight position header. P6 provides connections for the fac-tory test connections.
Test: Defrost Temperature Termination Shunt(Jumper) Pins--The defrost board selections are: 50, 70,90, and 100°F (10, 21, 32 and 38°C). The shunttermination pin is factory set at 50°F (10°C). If thetemperature shunt is not installed, the default terminationtemperature is g0°F (32°C).
Note: The Y1 input must be active (ON) and the "0" roomthermostat terminal into board must be inactive.
DIAGNOSTIC LEDS
The state (Off, On, Flashing) of two LEDs on the defrostboard (DS1 [Red] and DS2 [Green]) indicate diagnosticsconditions that are described in table 10.
DELAY MODEThe defrost board has a field-selectable function to reduceoccasional sounds that may occur while the unit is cyclingin and out of the defrost mode. When a jumper is installedon the DELAY pins, the compressor will be cycled off for 30seconds going in and out of the defrost mode. Units areshipped with jumper installed on DELAY pins.DEFROST BOARD PRESSURE SWITCHCONNECTIONSThe unit's automatic reset pressure switches (LOPS - $87and Ht PS - $4) are factory-wired into the defrost board onthe LO-PS and Ht-PS terminals, respectively.Low Pressure Switch (LO-PS)
When the low pressure switch trips, the defrost board willcycle off the compressor, and the strike counter in theboard will count one strike. The low pressure switch isignored under the following conditions:
• during the defrost cycle and 90 seconds after thetermination of defrost
• when the average ambient sensor temperature is below15° F (-9°C)
• for 90 seconds following the start up of the compressor
• during test modeHigh Pressure Switch (HI-PS)
When the high pressure switch trips, the defrost board willcycle off the compressor, and the strike counter in theboard will count one strike.
DEFROST BOARD PRESSURE SWITCH SETTINGS
• High Pressure (auto reset) - trip at 590 psig; reset at418 psig.
• Low Pressure (auto reset) - trip at 25 psig; reset at 55psig.
Low Ambient Thermostat Pins - P3 provides selection ofthe Y2 compressor lock-in temperature. The XP14 seriesheat pumps do not use a Y2 compressor and thereforethese pins are not active.FIVE-STRIKE LOCKOUT FEATURE
The internal control logic of the board counts the pressureswitch trips only while the Y1 (Input) line is active. If apressure switch opens and closes four times during a Y1(Input), the control logic will reset the pressure switch tripcounter to zero at the end of the Y1 (Input). If the pressureswitch opens for a fifth time during the current Y1 (Input),the control will enter a lockout condition.
The five-strike pressure switch lockout condition can bereset by cycling OFF the 24*volt power to the control boardor by shorting the TEST pins between 1 and 2 seconds. Alltimer functions (run times) will also be reset.
If a pressure switch opens while the Y1 Out line isengaged, a 5-minute short cycle will occur after the switchcloses.
Page 20505244M 04/08
Actuation--When the reversing valve is de-energized,the Y1 circuit is energized, and the coil temperature isbelow 35°F (2°C), the board logs the compressor run time.If the board is not calibrated, a defrost cycle will be initiatedafter 34 minutes of heating mode compressor run time.The control will attempt to self-calibrate after this (and allother) defrost cycle(s).
Calibration success depends on stable systemtemperatures during the 20-minute calibration period. Ifthe board fails to calibrate, another defrost cycle will beinitiated after 90 minutes of heating mode compressor runtime. Once the defrost board is calibrated, it initiates ademand defrost cycle when the difference between theclear coil and frosted coil temperatures exceeds themaximum difference allowed by the control OR after 6hours of heating mode compressor run time has beenlogged since the last defrost cycle.
NOTE - If ambient or coil fault is detected, the board will notexecute the TEST mode.
Termination--The defrost cycle ends when the coiltemperature exceeds the termination temperature or after
14 minutes of defrost operation. If the defrost is terminatedby the 14-minute timer, another defrost cycle will beinitiated after 34 minutes of run time.
Each test pin shorting will result in one test event. Foreach TEST the shunt (jumper) must be removed for atleast one second and reapplied. Refer to flow chart asillustrated in figure 25 for TEST operation.
Test Mode--When Y1 is energized and 24V power isbeing applied to the board, a test cycle can be initiated byplacing the termination temperature jumper across theTEST pins for two to five seconds. If the jumper remainsacross the TEST pins longer than five seconds, the controlwill ignore the TEST pins and revert to normal operation.The jumper will initiate one cycle per test.
Enter the TEST mode by placing a shunt (jumper) acrossthe TEST pins on the board after power-up. The TESTpins are ignored and the test function is locked out if theshunt is applied on the TEST pins before power-up. Boardtimings are reduced, the low-pressure switch is ignoredand the board will clear any active lockout condition.
NOTE - The 30-second off cycle is NOT functional whenjumpering the TEST pins.
Short test pins for longer than 1second but less than 2 seconds
Clear any short cycle lockout and5 strike fault lockout function, ifapplicable. No other functions willbe executed and unit will continuein the mode it was operating.
Y1 Active ('O"line inactive) ]
Ii
Short test pins for more than 2 seconds
I If in COOLING Mode
Clear any short cycle lockout and 5 strike fault lockoutfunction, if applicable.
IIIfin Mode IIIfin ModeNo further test modeoperation will be executeduntil the test short is
removed and reapp ed.
The controller will check for ambientand coil faults (open or shorted). If afault exists, the unit will remain in HeatMode and no further test modeoperation will be executed until thetest short is removed and re applied. Ifno fault exists the unit will go intoDefrost mode.
The unit will terminate defrostand enter Heat Modeun-calibratedwith defrost timerset for 34 minute test. Nofurther test mode operation willbe executed until the test shortis removed and reapplied.
Test pin short REMAINS in place for more than 5 seconds / Test short REMOVED before maximumpins a
of 5 seconds
The unit will return to Heat mode un-calibrated with defrost timer set for I34 minutes. No further test mode operation will be executed until the test The unit will remain in Defrost mode until
short s removed and re apped, j termination on time or temperature
Figure 25. Test Mode
Page 21XP14 SERIES
DEFROST BOARD DIAGNOSTICSSee table 10 to determine defrost board operational conditions and to diagnose cause and solution to problems.
Table 10. Defrost Control Board Diagnostic LEDs
DS2 DSlCondition/Code Possible Cause(s) SolutionGreen Red
1 Check control transformer power (24V).No power (24V) to board terminals R 2 If power is available to board and LED(s) do notOFF OFF Power problem and C or board failure.
light, replace board.
Simultaneous Unit operating normally or in standbySLOW Flash Normal operation mode. None required.
Alternating SLOW 5-minute anti-short cycle Initial power up, safety trip, end ofNone required (Jumper TEST pins to override)Flash delay room thermostat demand.
Simultaneous Sensor being detected open or shorted or out of temperature range. Board will revert to time/FAST Flash Ambient Sensor Problem temperature defrost operation. (System will still heat or cool).
Alternating Coil Sensor Problem Sensor being detected open or shorted or out of temperature range. Board will not performFAST Flash demand or time/temperature defrost operation. (System will still heat or cool).
ON Indicates that board has internal component failure. Cycle 24 volt power to board. If code doesON Circuit Board Failure not clear, replace board.
FAULT and LOCKOUT CODES (Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)
SLOWOFF Low Pressure FaultFlash
OFF ON Low Pressure LOCKOUT
SLOWFlash OFF High Pressure Fault
ON OFF High Pressure LOCKOUT
SLOW Discharge Line TemperatureFlash ON Fault
FAST Discharge Line TemperatureFlash ON LOCKOUT
FastFlash Discharge Sensor Fault
OFF Discharge SensorLOCKOUT
1 Restricted air flow over indoor oroutdoor coil.
2 Improper refrigerant charge insystem,
3 Improper metering device installed orincorrect operation of meteringdevice,
4 Incorrect or improper sensor locationor connection to system.
1 Remove any blockages or restrictions from coilsand/or fans. Check indoor and outdoor fan motor forproper current draws.
2 Check system charge using approach and subcool-ing temperatures,
3 Check system operating pressures and compare tounit charging charts.
4 Make sure all pressure switches and sensors havesecure connections to system to prevent refrigerantleaks or errors in pressure and temperature mea-surements.
This model does not have a defrost line sensor, therefore this code is not applicable.
The XP14 series units does not use a defrost line sensor, However, a resistor is installedOFF across pins P4-1 and P4-2. If the resistor is missing or damage then this fault code will be
displayed.
FastFlash This model does not have a defrost line sensor, therefore this code is not applicable.
Table 11. Sensor Temperature/Resistance RangeSensor Temperature Range °F (°C) Resistance Values Range (ohms) Pins/Wire Color
Outdoor (Ambient) -35 to 120 (-37) to (48) 280,000 to 3750 3 and 4 (Black)
Coil -35 to 120 (-37) to (48) 280,000 to 3750 5 and 6 (Brown)
Note: Sensor resistance decreases as sensed temperature increases (see figure 26).
Ambient Sensor--The ambient sensor (shown in figure27) considers outdoor temperatures below -35°F (-37°C)or above 120°F (48°C) as a fault. If the ambient sensor isdetected as being open, shorted or out of the temperaturerange of the sensor, the board will not perform demanddefrost operation. The board will revert totime/temperature defrost operation and will display theappropriate fault code. Heating and cooling operation willbe allowed in this fault condition.
Coil Sensor--The coil temperature sensor (shown infigure 27) considers outdoor temperatures below -35°F(-37°C) or above 120°F (48°C) as a fault. If the coiltemperature sensor is detected as being open, shorted orout of the temperature range of the sensor, the board willnot perform demand or time/temperature defrostoperation and will display the appropriate fault code.Heating and cooling operation will be allowed in this faultcondition.
OPERATIONAL DESCRIPTION
The defrost control board has three basic operationalmodes: normal, calibration, and defrost.
Normal Mode--The demand defrost board monitors theO line, to determine the system operating mode(heat/cool), outdoor ambient temperature, coiltemperature (outdoor coil) and compressor run time todetermine when a defrost cycle is required.
Calibration Mode--The board is considered uncalibratedwhen power is applied to the board, after cool modeoperation, or if the coil temperature exceeds thetermination temperature when it is in heat mode.
Calibration of the board occurs after a defrost cycle toensure that there is no ice on the coil. During calibration,the temperature of both the coil and the ambient sensorare measured to establish the temperature differentialwhich is required to allow a defrost cycle.
Defrost Mode--The following paragraphs provide adetailed description of the defrost system operation.
DETAILED DEFROST SYSTEM OPERATION
Defrost Cycles--The demand defrost control boardinitiates a defrost cycle based on either frost detection ortime,
• Frost Detection--If the compressor runs longer than34 minutes and the actual difference between the clearcoil and frosted coil temperatures exceeds themaximum difference allowed by the control, a defrostcycle will be initiated,
IMPORTANT - The demand defrost control board willallow a greater accumulation of frost and will initiatefewer defrost cycles than a time/temperature defrostsystem.
• Time--If six hours of heating mode compressor runtime has elapsed since the last defrost cycle while the
Page 23XP14 SERIES
coil temperature remains below 35°F (2°C), thedemand defrost control will initiate a defrost cycle.
,WARNING I
Before the start of each heating and cooling season, thefollowing service checks should be performed by aqualified service technician. First, turn off electrical powerto the unit prior to performing unit maintenance.
• Inspect and clean the outdoor and indoor coils. Theoutdoor coil may be flushed with a water hose.
NOTE - It may be necessary to flush the outdoor coilmore frequently if it is exposed to substances whichare corrosive or which block airflow across the coil(e.g., pet urine, cottonwood seeds, etc.)
• Visually inspect the refrigerant lines and coils for leaks.
• Check wiring for loose connections.
• Check voltage at the indoor and outdoor units (withunits operating).
• Check the amperage draw at the outdoor fan motor,compressor, and indoor blower motor. Values shouldbe compared with those given on unit nameplate.
• Check, clean (or replace) indoor unit filters.
• Check the refrigerant charge and gauge the systempressures.
• Check the condensate drain line for free andunobstructed flow; clean, if necessary.
• Adjust blower speed for cooling. Measure the pressuredrop over the coil to determine the correct blower CFMRefer to the unit information service manual for pressuredrop tables and procedure.
NOTE - if owner reports insufficient cooling, the unitshould be gauged and refrigerant charge checked.Refer to section on refrigerant charging in thisinstruction.
MAINTENANCE
In order to ensure peak performance, your system must beproperly maintained. Clogged filters and blocked airflowprevent your unit from operating at its most efficient level.
1. Air Filter--Ask your Lennox dealer to show you whereyour indoor unit's filter is located. It will be either at theindoor unit (installed internal or external to the cabinet)or behind a return air grille in the wall or ceiling. Checkthe filter monthly and clean or replace it as needed.
2, Disposable Filter--Disposable filters should bereplaced with a filter of the same type and size,
NOTE - If you are unsure about the filter required foryour system, call your Lennox dealer for assistance.
IMPORTANT
3, Reusable Filter--Many indoor units are equippedwith reusable foam filters. Clean foam filters with amild soap and water solution; rinse thoroughly; allowfilter to dry completely before returning it to the unit orgrille.
NOTE - The filter and all access panels must be inplace any time the unit is in operation.
4, Electronic Air Cleaner--Some systems areequipped with an electronic air cleaner, designed toremove airborne particles from the air passing throughthe cleaner. If your system is so equipped, ask yourdealer for maintenance instructions.
5. Indoor Unit--The indoor unit's evaporator coil isequipped with a drain pan to collect condensateformed as your system removes humidity from theinside air. Have your dealer show you the location ofthe drain line and how to check for obstructions. Thiswould also apply to an auxiliary drain, if installed.
A IMPORTANT
. Outdoor Unit--Make sure no obstructions restrictairflow to the outdoor unit. Leaves, trash or shrubscrowding the unit cause the outdoor unit to work harderand use more energy. Keep shrubbery trimmed awayfrom the unit and periodically check for debris whichcollects around the unit.
When removing debris from around the unit, be awareof metal edges on parts and screws. Although specialcare has been taken to keep exposed edges to aminimum, physical contact with metal edges andcorners while applying excessive force or rapid motioncan result in personal injury.
Cleaning of the outdoor unit's coil should be performedby a trained service technician. Contact your dealerand set up a schedule (preferably twice a year, but atleast once a year) to inspect and service your airconditioning or heat pump system.
Page 24505244M 04/08
HEAT PUMP OPERATION
Your new Lennox heat pump has several characteristicsthat you should be aware of:
• Heat pumps satisfy heating demand by deliveringlarge amounts of warm air into the living space, Thisis quite different from gas- or oil-fired furnaces or anelectric furnace which deliver lower volumes ofconsiderably hotter air to heat the space,
• Do not be alarmed if you notice frost on the outdoor coilin the winter months. Frost develops on the outdoorcoil during the heating cycle when temperatures arebelow 45°F (7°C). An electronic control activates adefrost cycle lasting 5 to 15 minutes at preset intervalsto clear the outdoor coil of the frost,
• During the defrost cycle, you may notice steam risingfrom the outdoor unit. This is a normal occurrence. Thethermostat may engage auxiliary heat during thedefrost cycle to satisfy a heating demand: however,the unit will return to normal operation at theconclusion of the defrost cycle,
In case of extended power outage...
The heat pump is equipped with a compressor crankcaseheater which protects the compressor from refrigerantslugging during cold weather operation,
If power to your unit has been interrupted for several hoursor more, set the room thermostat selector to theEmergency Heat setting to obtain temporary heat withoutthe risk of serious damage to the heat pump,
tn Emergency Heat mode, all heating demand is satisfiedby auxiliary heat; heat pump operation is locked out. After asix-hour compressor crankcase warm-up period, thethermostat can be switched to the Heat setting and normalheat pump operation may resume,
THERMOSTAT OPERATIONS
Though your thermostat may vary somewhat from thedescription below, its operation will be similar.
Temperature Setting Levers
Most heat pump thermostats have two temperatureselector levers: one for heating and one for cooling. Set thelevers or dials to the desired temperature setpoints for bothheating and cooling. Avoid frequent temperatureadjustment; turning the unit off and back on beforepressures equalize puts stress on the unit compressor.
Fan Switch
In AUTO or INT (intermittent) mode, the blower operatesonly when the thermostat calls for heating or cooling. Thismode is generally preferred when humidity control is apriority. The ON or CONT mode provides continuousindoor blower operation, regardless of whether thecompressor or auxiliary heat are operating. This mode isrequired when constant air circulation or filtering is desired,
System Switch
Set the system switch for heating, cooling or autooperation, The auto mode allows the heat pump toautomatically switch from heating mode to cooling mode tomaintain predetermined comfort settings, Many heatpump thermostats are also equipped with an emergencyheat mode which locks out heat pump operation andprovides temporary heat supplied by the auxiliary heat,
Indicating Light
Most heat pump thermostats have an amber light whichindicates when the heat pump is operating in theemergency heat mode,
Temperature Indicator
The temperature indicator displays the actual roomtemperature,
Programmable Thermostats
Your Lennox system may be controlled by aprogrammable thermostat. These thermostats provide theadded feature of programmable time-of-day setpoints forboth heating and cooling, Refer to the user's informationmanual provided with your particular thermostat foroperation details.Preservice Check
If your system fails to operate, check the following beforecalling for service:• Check to see that all electrical disconnect switches are
ON.
• Make sure the room thermostat temperature selectoris properly set.
• Make sure the room thermostat system switch isproperly set.
• Replace any blown fuses, or reset circuit breakers.
• Make sure unit access panels are in place.• Make sure air filter is clean,
• Identify the unit model number before calling,
OPTIONAL ACCESSORIESRefer to the Engineering Handbook for optionalaccessories that may apply to this unit, The following mayor may not apply:• Loss of charge kit• High pressure switch kit• Mild weather kit
