Table of Contents GENERAL .......................................... 3 INSTALLATION ...................................... 4 PRE-INSTALLATION INSPECTION OF EQUIPMENT 4 RIGGING ......................................... 4 SITE LOCATION .................................... 5 UNIT MOUNTING ................................... 5 GENERAL DATA ..................................... 5 DIMENSIONAL DATA ................................. 6 WATER PIPING ...................................... 8 CONDENSOR PRESSURE CONTROL ........................ 9 DUCTWORK ....................................... 11 SUPPLY AIR I RETURN AIR CONFIGURATION .......... 11 EVAPORATOR BLOWER DISCHARGE CONVERSION ..... 12 ELECTRICAL WIRING ................................ 12 MOTOR AND PULLEY DATA .......................... 16 BLOWER SPEED ADJUSTMENT ..................... 16 START-UP AND OPERATION .......................... 16 MAINTENANCE/SERVICE ............................ 19 FILTERS ......................................... 19 EVAPORATOR AND CONDENSER COILS .............. 19 BLOWERS ....................................... 19 DRIVE BELTS ..................................... 19 REFRIGERANT CIRCUIT(S) ......................... 19 INSTALLATION INSTRUCTION CAUTION:READ ALL SAFETY GUIDES BEFORE YOU START TO INSTALL YOUR FURNACE. SAVE THIS MANUAL 036-21347-001-A-0302) WATER COOLED AIR CONDITIONING UNITS MODELS: CB060-096-120-180-240-300
CAUTION:READ ALL SAFETY GUIDES BEFORE YOUSTART TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
036-21347-001-A-0302)
WATER COOLED AIRCONDITIONING UNITS
MODELS: CB060-096-120-180-240-300
036-21347-001-A-0302
2 Unitary Products Group
IMPROPER INSTALLATION MAY CREATE ACONDITION WHERE THE OPERATION OFTHE PRODUCT COULD CAUSE PER-SONAL INJURY OR PROPERTY DAMAGE.
IMPROPER INSTALLATION, ADJUSTMENT,ALTERATION, SERVICE OR MAINTE-NANCE CAN CAUSE INJURY OR PROP-ERTY DAMAGE. REFER TO THIS MANUALFOR ASSISTANCE OR ADDITIONALINFORMATION, CONSULT A QUALIFIEDINSTALLER, SERVICE AGENCY OR THEGAS SUPPLIER.
THIS PRODUCT MUST BE INSTALLED INSTRICT COMPLIANCE WITH THEENCLOSED INSTALLATION INSTRUC-TIONS AND ANY APPLICABLE LOCAL,STATE, AND NATIONAL CODES INCLUD-ING BUT NOT LIMITED TO, BUILDING,ELECTRICAL AND MECHANICAL CODES.
The furnace area must not be used as abroom closet or for any other storage pur-poses, as a fire hazard bay be created.Never store items such as the following on,near or in contact with the furnace.
1. Spray or aerosol cans, rags, brooms, dust mops,vacuum cleaners or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaningcompounds; plastic items or containers; gasoline,kerosene, cigarette lighter fluid, dry cleaning fluids orother volatile fluid.
3. Paint thinners and other painting compounds.
4. Paper bags, boxes or other paper products
5. Never operate the furnace with the blower doorremoved. To do so could result in serious personalinjury and/or equipment damage.
Our units are designed to accommodate the ever-changing installation requirements of today's mar-ket. All models 5 -25 tons are shipped as factory-charged unitized packages. These units aredesigned to allow easy passage through doors,hallways and elevators. All models are designedfor free-standing mounting on the floor. All unitcomponents are securely mounted inside theheavy gauge "Galvalume" steel cabinet. All unitsare lined with 1/2" thick -2 Ib density acousticalinsulation to ensure the quietest operation. Allmodels are provided with medium- efficiency 2"thick throwaway filters. All models are shippedwith vertical evaporator fan discharge as stan-dard. The evaporator fan discharge configurationis field convertible on all units. An optional dis-charge plenum is available for horizontal 'free-blow' applications.
The 5 ton model has a single refrigerant circuit.The 8 through 20 ton models are dual compressorunits with two independent compressor/condensercircuits. The 25 ton model has three independentcompressor/condenser circuits. Evaporator coilsare of copper tube and rippled aluminum plate finconstruction. The high-efficiency tube-in-tube con-densers feature a convoluted inner tube design foroptimum performance. Standard models feature acopper inner tube surrounded by a steel outertube, and carry a 400 psig working pressure rat-ing. Multiple refrigerant circuit models featureinternally manifolded condensers (single water in,water out connection).
High efficiency Scroll compressors are used in allmodels, mounted on durable rubber isolators toreduce vibration and noise while operating. Eachrefrigerant circuit is equipped with high pressureand low pressure switches. All models areequipped with an adjustable thermal expansionvalve (with external equalizer), one valve per cir-cuit. Each refrigerant circuit is also equipped witha liquid line filter drier, sight glass/moisture indica-tor, and service access ports. An electrically re-
setable lock-out relay will shut off the compressorin the event of pressure switch trip during opera-tion. Control circuit operates on 24V, and featuresan oversized transformer. Optional anti-short cir-cuit timers can be field/factory installed.
Installation time is minimized with all models.
When planning an installation consider powersupply, thermostat, condensate drain line, ductrun, and service clearances. A remote thermostatdevice is field supplied and installed to control theunit operation. Attachments to the unit include thebolt-on filter frame (20 and 25 ton only), and fac-tory supplied discharge duct flanges.
Service access doors are equipped with liftinghandles, and are located on all sides of the unit toallow easy servicing of all components. The com-pressor access door is supplied with knock-outsallowing gauge lines to be installed and readingsto be taken with the machine in operation. In addi-tion there are removable viewing ports to allowobservation of the sight glass without removingthe access door.
All units are equipped with centrifugal blowerscombined with variable pitch adjustable pulleys.Forward curved double width, double inlet blowersare used for evaporator air movement. All modelsemploy a draw-through air flow arrangement.Large evaporator coil face areas reduce noise lev-els, air pressure drops, and minimize potentialcondensate blow-off .All blower wheels are galva-nized steel, with solid steel shafts supported inpermanently lubricated ball bearings. V-belts driveall models and blower RPM can be adjustedthrough the motor sheave.
ONLY QUALIFIED PERSONNEL SHOULD PER-FORM INSTALLATION AND SERVICE OF UNITS.
All units are factory tested to ensure safe opera-tion and quality assembly. Units are packaged andsealed on shipping skids and shipped in first classcondition. Torn and broken packaging, scratchedor dented panels should be reported to carrierimmediately. Internal inspection of all units shouldbe performed prior to installation. Remove allaccess doors and check for visual defects that canoccur during transport. Any problems found inter-nally should be reported to carrier and manufac-turer immediately. Refrigerant circuit should bechecked to ensure no leaks have occurred duringshipment. Install gauge set to high and low pres-sure ports to confirm pressure has been main-tained and no leaks have occurred duringshipment. Repair any damage prior to installationto ensure safe operation.
NOTE: Record any unit damage on the Bill of Lad-ing and report to carrier and factory immediately.Shipping and handling damages are not warrantyitems.
PRIOR TO MOUNTING UNIT, CHECK INDIVID-UAL UNIT WEIGHTS AND VERIFY LIFTINGCAPACITY OF LIFTING EQUIPMENT EXCEEDSWEIGHT OF UNITS BY SAFE MARGINS. FAIL-URE TO DO SO MAY RESULT IN UNIT DAM-AGE, PERSONAL INJURY OR EVEN DEATH.
DETERMINE THE ACTUAL CENTER OF GRAV-ITY OF THE UNIT BY PERFORMING A TESTLIFT. LIFTING AN UNBALANCED UNIT CANCAUSE PERSONAL INJURY OR EVEN DEATH.
LOCK ALL ELECTRICAL POWER SUPPLYSWITCHES IN THE OFF POSITION BEFOREINSTALLING THE UNIT. FAILURE TO DISCON-NECT POWER SUPPLY MAY RESULT IN ELEC-TRICAL SHOCK OR EVEN DEATH.
WARNING
WARNING
WARNING
036-21347-001-A-0302
Unitary Products Group 5
Units are not built to accommodate rigging ofchains for lifting. Please use straps to insureproper lift. See WARNINGS:
SITE LOCATION
Location -To ensure unit operates at maximumefficiencies, choose a dry indoor area where thetemperature is controlled between 50 deg F and115° F. Consideration of surrounding areas shouldbe taken when choosing a location to install theunit. Common vibration and sound levels associ-ated with commercial equipment may be objec-tionable to people or equipment. Installthermostats, air supplies and returns so that eachunit will operate only on individual unit control.
UNIT MOUNTING
The 5 through 25 ton models are shipped as afully assembled integral package. The 5-15 tonunits may be field split between the evaporator/compressor section and the upper blower section;to allow for passage through doors, elevators,hallways, etc. Units are not intended for outdoorinstallation.
Floor mounted units should be secured on a solid,level surface or sturdy stand. (refer to typicalinstallation diagram on Page 4). The use of an iso-lating rubber sheet is recommended to reducevibration and noise transmission. Ensure that theentire base is continuosly supported -do not sup-port unit at corner points only!
TABLE 1: GENERAL UNIT INFORMATION
Note: The water cooled coaxial condensers in these unitshave copper tubing and are NOT suitable for salt or brackishwater. Do not install these units outdoors, or in any areawhere the surrounding temperature may drop below 32degrees F.
All factory installed water piping terminates insidethe unit. Multi-condenser units feature manifoldedsingle water in and out connections.
Note: Water connection fittings are threaded cop-per. Use caution when tightening steel pipe intocopper fittings. Always use a backing wrench onthe hex fittings inside the unit.
It is recommended that flexible connectors be pro-vided on the water supply and return lines if noiseand vibration transmission could be a problem.
Water piping should include shutoff/balancingvalves so that the unit can be serviced withoutshutting down and draining the entire water supplycircuit. Since units are piped in parallel piping cir-cuits, the shutoff valves may be used to equalixethe pressure drop to each branch for even con-denser water distribution. A bibcock or a pluggedtee fitting should be installed between the shut-offvalves and the unit in both the inlet and outletpipes. These connections are to provide for acidcleaning of the condenser, if this should becomenecessary.
UNIT A B C D E
CB240 83.00” 32.50” 73.13” 15.00” 4.94”
CB300 88.00” 34.00” 76.12” 20.00” 3.63”
036-21347-001-A-0302
Unitary Products Group 9
CONDENSER PRESSURE CONTROL
Water regulating valves provide control of thequantity of condenser water supplied to the unit bysensing the condensing temperature. The factoryinstalled Condenser Pressure Control option pro-vides a regulating valve for each internal con-denser water circuit.
The water regulating valve needs to be adjustedto maintain a leaving water temperature between90 degrees F and 100 degrees F. If using a refrig-erant discharge pressure gauge, adjust the watervalve to maintain a condensing pressure or 170 to220 PSIG. The valve is adjusted by turning the 1/4inch square shaft on top of the spring housing.Turning the adjusting screw counter clockwise willraise the opening pressure and raise the condens-ing pressure being maintained. Turning the adjust-ing screw clockwise will lower the opening pointand lower the condensing pressure being main-
tained. If mains water is being used, make surethe valve closes soon after the compressor stops.If the flow does not stop after a few minutes, raisethe opening pressure by turning the adjustingshaft caunter clockwise until the flow stops.
If the unit is running on mains water, we recom-mend adjusting the water regulating valve to give100 degrees F leaving water temperature or 220PSIG condensing temperature. This will give thebest compromise between low water flow andhigh operating efficiency. If the condenser water isbeing re-circulated through a cooling tower or achilled water system, it is recommended that thewater regulating valve to set for a lower condens-ing temperature. This will provide higher effi-ciency, lower operating cost and lower soundlevel. The minimum condensing pressure requiredfor satisfactory expansion valve operation is 170PSIG. This corresponds to a leaving water tem-perature of 90 degrees F.
036-21347-001-A-0302
10 Unitary Products Group
FIGURE 5: WATERSIDE PRESSURE DROP(STANDARD UNIT - MANIFOLDED CONDENSERS)
036-21347-001-A-0302
Unitary Products Group 11
DUCTWORK
When installing ductwork, adhere to local Codesand sensible practice. Minimize duct runs andavoid abrupt changes in direction where possible.Allow ample access space for servicing of thecoils and changing of filters. Perform regularmaintenance on ducts to increase unit life, main-tain efficient operation, and reduce accumulationof explosive dust. Refer to blower performancecharts, and engineer duct runs and accessorypressure drop so as not to exceed maximumexternal static values.
Canvas or other types of flexible collars are rec-ommended for connecting the air ducts to the unit.The supply air duct collar can be connecteddirectly to the blower outlet flanges. Return airmay be ducted to the unit, or drawn directly fromthe conditioned space (5-15 ton models withoptional return air grille) or mechanical room (20and 25 ton models). If a ducted
return is desired, duct connection flanges may besecured directly to the air intake opening of the 5through 15 ton units -filters are accessible fromthe right hand side. The filter frame on 20 and 25ton models has duct attachment flanges incorpo-rated into the filter rack.
SUPPLY AIR/RETURN AIR CONFIGURATION
All models are field convertible for multiple supply/return configurations. The 5 through 15 ton mod-els feature a removable upper fan module thatcan be rotated 180° for top rear discharge applica-tions. In addition, the blower outlet panel may beinterchanged with the front panel of the fan mod-ule. Interchanging these two panels allows hori-zontal fan discharge to either front or rear of theunit.
The blower outlet panel may also be interchangedon the 20 and 25 ton units to provide horizontaldischarge.
FIGURE 6 : SUPPLY AIR/RETURN AIR CONFIGURATION
036-21347-001-A-0302
12 Unitary Products Group
EVAPORATOR BLOWER DISCHARGECONVERSION
All models can be field converted to the alternateevaporator discharge orientation. All models shipwith vertical fan discharge as standard.
Procedure for converting the fan discharge fromvertical to horizontal is similar on all models, sin-gle fan or dual fan.
a. Remove blower drive belt on all models with basemounted motors. Remove the complete fan motorand drive on models with blower mounted motorassemblies.
b. Remove the panel attachment screws on the alter-nate location access panel (front evaporator sectionpanel on 20 and 25 ton, front blower module panelon others ). On 5 through 15 ton units, the front roofsupport angle must be removed to allow access tothe front panel. Remove the panel and set aside.
c. Remove the panel attachments screws on theblower outlet mounting panel. Do not remove fasten-ers securing blowers to panel! The blowers are toremain attached to the mounting panel at all times.
d. Carefully remove the blower panel assembly fromthe evaporator cabinet. Do not allow blower hous-ings to contact the evaporator coil during theremoval. On some models, the housing(s) will haveto be "rotated" to exit through the panel opening.
e. Interchange the blower panel assembly with theposition of the alternate access panel. Exercise carein locating the panel. Do not allow blower housingsto contact the evaporator coil. Install the attachmentscrews and tighten securely.
f. Install the blank access panel into the remainingevaporator opening. Fasten securely.
g. Relocate the evaporator fan drive motor to the alter-nate location on 5 through 15 ton unit.
h. Install and adjust drive belts to appropriate tension.Test run blower and observe operation for unusualsounds or vibration.
In order to utilize the 'rear vertical' or 'rear horizon-tal' discharge on 5 through 15 ton models, theupper fan module must be rotated.
a. Disconnect power wiring at motor terminal box.
b. Remove corner connecting brackets which securethe blower module to the lower evaporator unit.
c. Carefully lift the blower module, and rotate 1800.Reposition the blower module on top of the evapora-tor/compressor unit. Reinstall the corner connectingbrackets.
d. Connect new power wire leads, from the evaporatormotor contactor in the electrical box to the motor ter-minal box. Ensure wires are routed clear of anymoving components. Secure the wiring so that itdoes not contact the evaporator coil.
ELECTRICAL WIRING
Follow local electrical codes when making electri-cal connections. Units are completely factorywired for normal supply voltages (ie.208-230, 460,575/3phase/60hz) Confirm unit specifications bychecking unit data plate. All electrical componentsare accessible through an independent electricalpanel located on the right hand end of the evapo-rator/compressor section. The electrical controlboxes are located behind outer access panels.The compressor section electrical cover is pro-vided with wiring diagrams on the inside, whichmust be opened to be read.
Provide individual power disconnects for eachunit. Install a secure ground to the bonding luglocated in the electrical control panel. If canvasflexible joints are used on ductwork, install aground wire to the ductwork as well.
DISCONNECT AND LOCK OUT POWER WHENSERVICING UNIT. FAILURE TO DO SO MAYRESUL T IN PERSONAL INJURY OR DEATHDUE TO ELECTRICAL SHOCK.
DISCONNECT AND LOCK OUT POWER WHENSERVICING UNIT. UNIT MAY START AUTOMATI-CALLY IF POWER IS NOT DISCONNECTED.FAILURE TO DO SO MAY RESULT IN PER-SONAL INJURY OR DEATH DUE TO ELECTRI-CAL SHOCK.
WARNING
WARNING
036-21347-001-A-0302
Unitary Products Group 13
IMPORTANT: All wiring must comply with applica-ble local and national codes (NEC). Type andlocation of disconnect switches must comply withall applicable codes.
Unit requires installer to provide a 24volt thermo-stat with appropriate heating and cooling stagesas needed. For low voltage wiring, 18 gauge wiremay be used for up to 50 feet lengths. Low voltageruns up to 125 feet require 16 gauge wire.
All models are designed for single zone coolingapplications, utilizing space or return air thermo-static controls. A low voltage terminal block is pro-
vided for hook-up of conventional orprogrammable thermostats.
The CB300 -25 ton models feature three indepen-dent compressor stages. A multi-stage commer-cial thermostat (ie. Honeywell T7300 series), orother type of multi-step controller, is recom-mended for use with these models. Alternatively,two of the three compressor stages may be wiredtogether to achieve two step capacity control.Please note that this arrangement will result inoutput staging of 33.3% / 66.6%.
036-21347-001-A-0302
14 Unitary Products Group
TABLE 2: ELECTRICAL DATA - STANDARD MOTORS
TABLE 3: ELECTRICAL DATA - OVERSIZE MOTORS
Notes: Data shown for packaged unit installation,with single point power supply.
Min. Circuit Ampacity ( MCA ) = 1.25 X Largestsingle motor amps (FLA or RLA) + sum of theremaining motor amps.
Max Fuse / Cct. Bkr Size ( MFS ) = 2.25 X Largest
motor amps + sum of the remaining motor amps.
Select next smallest NEC listed fuse size from cal-culated value.
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX. FUSE/
# QTY RLA LRA HP RLA RPM AMPACITY CCT. BKR. AMP
CB060A208-230/3/60
460/3/60575/3/60
1 @1 @1 @
19.37.56.4
123.049.540.0
1.001.001.00
3.11.61.3
180018001800
27.2310.989.30
451515
CB096A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
13.97.15.4
88.044.034.0
1.501.501.50
4.52.21.8
180018001800
35.7818.1813.95
452515
CB120A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
19.37.56.4
123.049.540.0
2.002.002.00
6.03.02.4
180018001800
49.4319.8816.80
602520
CB186A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
25.012.09.7
164.0100.090.0
3.003.003.00
8.44.23.4
180018001800
64.6531.2025.23
804030
CB240A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
33.617.313.5
225.0114.080.0
5.005.005.00
14.06.65.7
180018001800
89.6045.5336.08
1106045
CB300A208-230/3/60
460/3/60575/3/60
3 @3 @3 @
32.116.412.0
195.095.080.0
7.507.507.50
22.210.88.4
180018001800
126.5364.1047.40
1508050
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX. FUSE/
# QTY RLA LRA HP RLA RPM AMPACITY CCT. BKR. AMP
CB060A208-230/3/60
460/3/60575/3/60
1 @1 @1 @
19.37.56.4
123.049.540.0
1.501.501.50
3.11.61.3
180018001800
28.6311.589.80
451515
CB096A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
13.97.15.4
88.044.034.0
2.002.002.00
4.52.21.8
180018001800
37.2818.9814.55
502515
CB120A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
19.37.56.4
123.049.540.0
3.003.003.00
6.03.02.4
180018001800
51.8321.0817.80
702520
CB186A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
25.012.09.7
164.0100.090.0
5.005.005.00
8.44.23.4
180018001800
70.2533.6027.53
904535
CB240A208-230/3/60
460/3/60575/3/60
2 @2 @2 @
33.617.313.5
225.0114.080.0
7.507.507.50
14.06.65.7
180018001800
97.8049.7338.78
1256050
CB300A208-230/3/60
460/3/60575/3/60
3 @3 @3 @
32.116.412.0
195.095.080.0
10.0010.0010.00
22.210.88.4
360036003600
129.9364.9048.10
1508060
036-21347-001-A-0302
Unitary Products Group 15
TAB
LE
4:TA
BL
E5:
SU
PP
LYA
IRB
LO
WE
RP
ER
FO
RM
AN
CE
MO
DE
L#
SU
PP
LYC
FM
EX
TE
RN
AL
STA
TIC
PR
ES
SU
RE
-In
ches
W.C
.
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
HP
RP
MB
H
CB
060A
1800
791
0.46
872
0.53
948
0.60
1019
0.68
1090
0.76
1159
0.85
1193
0.89
1259
0.98
1321
1.07
1380
1.16
1437
1.25
1492
1.35
1544
1.44
--
--
2000
860
0.60
935
0.69
1006
0.77
1077
0.85
1136
0.94
1199
1.03
1263
1.12
1324
1.22
1383
1.32
1440
1.42
1494
1.52
--
--
--
--
2200
931
0.79
1001
0.88
1067
0.97
1129
1.06
1189
1.15
1247
1.25
1305
1.35
1363
1.45
1419
1.55
--
--
--
--
--
--
CB
096A
3000
568
0.70
628
0.81
688
0.92
746
1.05
801
1.19
855
1.35
906
1.50
954
1.65
1001
1.81
1046
1.97
--
--
--
--
--
3200
594
0.82
651
0.94
707
1.06
762
1.19
816
1.33
867
1.49
917
1.65
964
1.81
1010
1.98
--
--
--
--
--
--
3400
625
0.97
679
1.10
731
1.22
784
1.35
835
1.50
884
1.66
933
1.83
979
2.00
--
--
--
--
--
--
--
CB
120A
3600
620
1.04
666
1.16
716
1.29
765
1.43
815
1.56
864
1.71
912
1.88
958
2.00
1003
2.03
1046
2.41
1088
2.60
1129
2.78
1169
2.97
--
--
4000
681
1.40
721
1.53
765
1.68
811
1.83
856
1.97
900
2.13
9.45
2.29
988
2.46
1030
2.65
1071
2.84
1112
3.05
--
--
--
--
4400
726
1.77
760
1.91
797
2.05
837
2.21
878
2.38
919
2.54
960
2.70
1001
2.87
1040
3.05
--
--
--
--
--
--
CB
180A
5400
645
1.52
709
1.79
770
2.06
829
2.35
885
2.65
939
2.96
991
3.28
1042
3.61
1092
3.96
1140
4.32
1190
4.71
--
--
--
--
6000
700
2.00
759
2.30
815
2.60
870
2.91
922
3.23
973
3.56
1022
3.90
1070
4.25
1116
4.62
1162
4.99
--
--
--
--
--
6600
761
2.63
815
2.94
867
3.26
917
3.60
966
3.94
1014
4.29
1060
4.66
1104
5.02
--
--
--
--
--
--
--
CB
240A
7200
659
2.10
714
2.37
767
2.65
817
2.94
866
3.23
912
3.52
957
3.82
998
4.13
1037
4.44
1076
4.76
1115
5.11
1154
5.47
1193
5.73
1230
6.10
1265
6.4
8000
719
2.81
770
3.11
818
3.42
865
3.73
910
4.05
954
4.37
997
4.70
1038
5.03
1078
5.36
1115
5.71
1151
6.08
1186
6.46
1220
6.84
1254
7.23
--
8800
782
3.67
828
4.00
873
4.34
916
4.68
959
5.02
1000
5.37
1040
5.73
1079
6.09
1117
6.45
1154
6.81
1190
7.18
--
--
--
--
CB
300A
9000
800
3.93
846
4.27
890
4.61
932
4.96
974
5.32
1014
5.67
1053
6.03
1092
6.40
1129
6.77
1166
7.14
1202
7.51
1237
7.90
1271
8.28
1304
8.66
--
1000
087
85.
2992
05.
6796
06.
0599
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036-21347-001-A-0302
16 Unitary Products Group
MOTOR AND PULLEY DATA
TABLE 6: STANDARD BLOWER MOTOR AND DRIVE DATA
TABLE 7: OVERSIZE BLOWER MOTOR AND DRIVE DATA
BLOWER SPEED ADJUSTMENT
The RPM of the supply air and condenser airblowers will depend on the required CFM, and thestatic resistances of both the supply/dischargeand the return/intake duct systems. With this infor-mation, the RPM for the blowers can be deter-mined from the blower performance tables.Adjustment of blower speed is accomplished asfollows:
a. Loosen belt tension by moving motor towards theblower shaft via the adjustable mounting.
b. Loosen the setscrew in the adjustable motor pulleyflange. Remove external key on pulleys 4 in. dia andlarger.
c. Slower speed will increase when moveable flange isadjusted towards the fixed flange (closed). Blowerspeed will decrease when the moveable flange isadjusted away from the fixed flange (opened). Pul-leys are adjustable only in half-turn increments. Donot open pullev more than five full turns for "4L" and"A" belts. or six full turns for "B" belts.
d. Once the pulley has been opened/closed the appro-priate number of turns, replace the external key andtighten the adjustment setscrew. Proper torque is110-130 in.-Ibs.
e. Install drive belt and adjust motor mount to tensionbelt.
START-UP AND OPERATION
Start unit and check rotation of fans and compres-sors.
Scroll compressors will only compress in one rota-tional direction. Three phase compressors willrotate in either direction depending upon phasingof the power. Since there is a 50-50 chance ofconnecting power in such a way as to cause rota-tion in the reverse direction, it is important toensure proper rotation direction is achievedwhen the system is installed and operated.
Verification of proper direction is made by observ-ing that suction pressure drops and dischargepressure rises when the compressor is energized.Reverse rotation also results in an elevated sound
PRIOR TO STARTING UNIT FOR THE FIRSTTIME, TURN THE THERMOSTAT SYSTEMSWITCH TO OFF - OR RAISE THE COLLINGSETPOINT TO THE HIGHEST TEMPERATURETO PREVENT THE UNIT FROM STARTING,THEN CLOSE THE ELECTRICAL DISCONNECTSWITCH.
CAUTION
036-21347-001-A-0302
Unitary Products Group 17
level as well as substantially reduced currentdraw.
There is no negative impact on durability causedby operating three pase Scroll compressors in thereversed direction for a short period of time (underone hour). However, after several minutes of oper-ation, the compressors internal protector will trip.
If opposite rotation is needed, disconnect andreverse any two leads of the three phase supply.Reconnect power and observe for correct rotation.
Observe unit operation and check for unusualnoise or vibration.
Inspect filters monthly and replace as necessary.Use UL Class 2 rated filters. Factory supplied fil-ters are medium efficiency, extended surfacepleated type. Replacements should be of thesame type, to maintain optimum airflow perfor-mance.
EVAPORATOR AND CONDENSER COILS
Inspect the evaporator coil at filter change inter-vals. Inspect the condenser coil at least semi-annually. A dirty condenser coil will result in ele-vated condensing pressures and poor unit perfor-
mance. Dirty or clogged evaporator coils causeslow suction pressure and lost capacity. If the coilsappear dirty, clean them using mild detergent or acommercial coil cleaning agent.
BLOWERS
Inspect both the evaporator and condenser blow-ers at each regular service interval. Clean blowerwheels as needed. Bearings are permanentlysealed ball type, and do not require lubrication.Check bearings for any signs of wear ( movementbetween inner and outer races ). Ensure bearinglocking collars are secure to the shaft, and thatcollar locking screw is properly set. Check that theblower wheel is tight on the shaft, and that the hubset screws are properly torqued.
DRIVE BELTS
Examine belts periodically for wear. Glazed areason the drive surfaces indicate overheating due tobelt slippage. Ideal tension is the lowest tension atwhich the belt will not slip under peak load condi-tions. Over-tensioning shortens belt and bearinglife.
The tension on the belt should be adjusted for adeflection of 1164 of an inch per inch of belt span,with the appropriate force applied at the midpointof the span. Tension "New" belts at the maximumvalue indicated. Used belts should be maintainedat the minimum value.
REFRIGERANT CIRCUIT(S)
With the unit operating, check and record thecompressor discharge and suction pressures. Thecompressor running current should also be
recorded. A maintenance 'og of these readingscan indicate if the unit is operating within it's nor-mal limits. Abnormal readings should be investi-gated, and the Cause corrected.
DISCONNECT AND LOCK OUT POWER WHENSERVICING UNIT. FAILURE TO DO SO MAYRESULT IN PERSONAL INJURY OR DEATHDUE TO ELECTRICAL SHOCK.
Exercise care when working around the sharpmetal edges of door panels or door frames, etc.These edges can cause injury.
