Page 1
INSTALLATION
INSTRUCTION
CONTENTS
GENERAL ....................................3
INSTALLATION................................4
GENERALDATA...............................5
DIMENSIONALDATA ...........................6
WATERPIPING................................8
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
EVAPORATOR BLOWER DISCHARGE
CONVERSION................................12
ELECTRICALWIRING .........................12
MOTORANDPULLEYDATA ....................16
MAINTENANCE/SERVICE ......................19
®
WATERCOOLEDAIR
CONDITIONING UNITS
MODELS: CU060 - 096 -120 -180
240 - 300
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL THE UNIT.
SAVE THIS MANUAL
036-33072-001 Rev. A (0601)
Page 2
036-33072-001 Rev. A (0601)
COTable of Contents
WARNING
IMPROPER INSTALLATION MAY CREATE A
CONDITION WHERE THE OPERATION OF THE
PRODUCT COULD CAUSE PERSONAL INJURY
OR PROPERTY DAMAGE.
IMPROPER INSTALLATION, ADJUSTMENT,
AL TERATION, SERVICE OR MAINTENANCE
CAN CAUSE INJURY OR PROPERTY DAMAGE.
REFER TO THIS MANUAL FOR ASSISTANCE
OR ADDITIONAL INFORMATION, CONSULT A
QUALIFIED INSTALLER, SERVICE AGENCY OR
THE GAS SUPPLIER.
CAUTION
THIS PRODUCT MUST BE INSTALLED IN
STRICT COMPLIANCE WITH THE ENCLOSED
INSTALLATION INSTRUCTIONS AND ANY
APPLICABLE LOCAL, STATE, AND NATIONAL
CODES INCLUDING BUT NOT LIMITED TO,
BUILDING, ELECTRICAL AND MECHANICAL
CODES.
GENERAL............................................ 3
INSTALLATION ....................................... 4
PRE-INSTALLATIONINSPECTIONOFEQUIPMENT........ 4
RIGGING . . ......................................... 4
SITELOCATION ..................................... 5
UNITMOUNTING..................................... 5
GENERALDATA ...................................... 5
DIMENSIONALDATA................................... 6
WATERPIPING ....................................... 8
CONDENSOR PRESSURE CONTROL ......................... 9
DUCTWORK . ........................................ 11
SUPPLYAIRIRETURNAIRCONFIGURATION ........... 11
EVAPORATORBLOWERDISCHARGECONVERSION....... 12
ELECTRICALWIRING ................................. 12
MOTORANDPULLEYDATA............................ 16
BLOWERSPEEDADJUSTMENT....................... 16
START-UPANDOPERATION ........................... 16
MAINTENANCE/SERVICE.............................. 19
FILTERS .......................................... 19
EVAPORATORANDCONDENSERCOILS ............... 19
BLOWERS......................................... 19
DRIVEBELTS ...................................... 19
REFRIGERANT CIRCUIT(S) ........................... 19
Tables
GENERAL UNIT INFORMATION ...............................5
ELECTRICAL DATA - STANDARD MOTORS ......................14
ELECTRICALDATA-OVERSIZEMOTORS................14
SUPPLYAIRBLOWERPERFORMANCE ..................15
STANDARD BLOWER MOTOR AND DRIVE DATA ..................16
OVERSIZE
REFRIGERANTCHARGES .............................17
PRESSURE SWITCH SETTINGS (ALL) .........................17
BLOWER MOTOR AND DRIVE DATA .................16
2 UnitaryProductsGroup
Figures
GAS PIPING TYPICAL INSTALLATION LAYOUT (CUWC180 SHOWN)4
T
YPICAL INSTALLATION LAYOUT (CU 180 SHOWN).............. 4
IMENSIONS CU060/CU096/CU120 ........................ 6
D
IMENSIONS CU180.................................... 7
D
D
IMENSIONS CU240/CU300 .............................. 8
ATERSIDE PRESSURE DROP
W
(STANDARD UNIT -MANIFOLDED CONDENSERS) .............. 10
S
UPPLY AIR/RETURN AIR CONFIGURATION .................. 11
YPICAL WIRING DIAGRAM; 208-230V/3PH/60 HZ ............. 18
T
T
ENSION INFORMATION ................................. 19
Page 3
GENERAL
Our units are designed to accommodate the ever-changing
installation requirements of today's market. All models 5 -25
tons are shipped as factory-charged unitized packages.
These units are designed to allow easy passage through
doors, hallways and elevators. All models are designed for
free-standing mounting on the floor. All unit components are
securely mounted inside the heavy gauge "Galvalume" steel
cabinet. All units are lined with 1/2" thick -2 Ib density acoustical insulation to ensure the quietest operation. All models
are provided with medium- efficiency 2" thick throwaway filters. All models are shipped with vertical evaporator fan discharge as standard. The evaporator fan discharge
configuration is field convertible on all units. An optional discharge 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 compressor units with two
independent compressor/condenser circuits. The 25 ton
model has three independent compressor/condenser circuits.
Evaporator coils are of copper tube and rippled aluminum
plate fin construction. The high-efficiency tube-in-tube condensers feature a convoluted inner tube design for optimum
performance. Standard models feature a copper inner tube
surrounded by a steel outer tube, and carry a 400 psig working pressure rating. Multiple refrigerant circuit models feature
internally manifolded condensers (single water in, water out
connection).
High efficiency Scroll compressors are used in all models,
mounted on durable rubber isolators to reduce vibration and
noise while operating. Each refrigerant circuit is equipped
with high pressure and low pressure switches. All models are
equipped with an adjustable thermal expansion valve (with
external equalizer), one valve per circuit. Each refrigerant circuit is also equipped with a liquid line filter drier, sight glass/
moisture indicator, and service access ports. An electrically
036-33072-001 Rev. A (0601)
re-setable lock-out relay will shut off the compressor in the
event of pressure switch trip during operation. Control circuit
operates on 24V, and features an oversized transformer.
Optional anti-short circuit timers can be field/factory installed.
Installation time is minimized with all models. When planning
an installation consider power supply, thermostat, condensate drain line, duct run, and service clearances. A remote
thermostat device is field supplied and installed to control the
unit operation. Attachments to the unit include the bolt-on filter frame (20 and 25 ton only), and factory supplied discharge
duct flanges.
CAUTION
ONLY QUALIFIED PERSONNEL SHOULD PERFORM INSTALLATION AND SERVICE OF UNITS.
Service access doors are equipped with lifting handles, and
are located on all sides of the unit to allow easy servicing of
all components. The compressoraccess door is supplied with
knock-outs allowing gauge lines to be installed and readings
to be taken with the machine in operation. In addition there
are removable viewing ports to allow observation of the sight
glass without removing the access door.
All units are equipped with centrifugal blowers combined with
variable pitch adjustable pulleys. Forward curved double
width, double inlet blowers are used for evaporator air movement. All models employ a draw-through air flow arrangement. Large evaporator coil face areas reduce noise levels,
air pressure drops, and minimize potential condensate blowoff .All blower wheels are galvanized steel, with solid steel
shafts supported in permanently lubricated ball bearings. Vbelts drive all models and blower RPM can be adjusted
through the motor sheave.
Unitary Products Group 3
Page 4
036-33072-001 Rev. A (0601)
FIGURE 1: TYPICAL INSTALLATION LAYOUT (CU180 SHOWN )
INSTALLATION
PRE-INSTALLATION INSPECTION OF EQUIPMENT
All units are factory tested to ensure safe operation and quality assembly. Units are packaged and sealed on shipping
skids and shipped in first class condition. Torn and broken
packaging, scratched or dented panels should be reported to
carrier immediately. Internal inspection of all units should be
performed prior to installation. Remove all access doors and
check for visual defects that can occur during transport. Any
problems found internally should be reported to carrier and
manufacturer immediately. Refrigerant circuit should be
checked to ensure no leaks have occurred during shipment.
Install gauge set to high and low pressure ports to confirm
pressure has been maintained and no leaks have occurred
during shipment. Repair any damage prior to installation to
ensure safe operation.
NOTE:
report to carrier and factory immediately. Shipping and handling damages are not warranty items.
RIGGING
Record any unit damage on the Bill of Lading and
WARNING
PRIOR TO MOUNTING UNIT, CHECK INDIVIDUAL UNIT WEIGHTS AND VERIFY LIFTING
CAPACITY OF LIFTING EQUIPMENT EXCEEDS
WEIGHT OF UNITS BY SAFE MARGINS. FAILURE TO DO SO MAY RESULT IN UNIT DAMAGE, PERSONAL INJURY OR EVEN DEATH.
WARNING
DETERMINE THE ACTUAL CENTER OF GRAVITY OF THE UNIT BY PERFORMING A TEST
LIFT. LIFTING AN UNBALANCED UNIT CAN
CAUSE PERSONAL INJURY OR EVEN DEATH.
Units are not built to accommodate rigging of chains for lifting. Please use straps to insure proper lift. See WARNINGS:
4 UnitaryProductsGroup
SITE LOCATION
Page 5
UNIT MOUNTING
036-33072-001 Rev. A (0601)
WARNING
The 5 through 25 ton models are shipped as a fully assembled integral package. The 5-15 ton units may be field split
LOCK ALL ELECTRICAL POWER SUPPLY
SWITCHES IN THE OFF POSITION BEFORE
INSTALLING THE UNIT. FAILURE TO DISCON-
between the evaporator/compressor section and the upper
blower section; to allow for passage through doors, elevators,
hallways, etc. Units are not intended for outdoor installation.
NECT POWER SUPPLY MAY RESULT IN ELECTRICAL SHOCK OR EVEN DEATH.
Floor mounted units should be secured on a solid, level surface or sturdy stand. (refer to typical installation diagram on
Page 4). The use of an isolating rubber sheet is recom-
Location -To ensure unit operates at maximum efficiencies,
choose a dry indoor area where the temperature is controlled
between 50 deg F and 115deg F. Consideration of surround-
mended to reduce vibration and noise transmission. Ensure
that the entire base i s continuosly supported -do not support
unit at corner points only!
ing areas should be taken when choosing a location to install
the unit. Common vibration and sound levels associated with
GENERAL DATA
commercial equipment may be objectionable to people or
equipment. Install thermostats, air supplies and returns so
that each unit will operate only on individual unit control.
TABLE 1: GENERAL UN IT INFORMATION
Model CU060 CU096 CU120 CU180 CU240 CU300
Nominal Cooling (Ton) 5 8 10 15 20 25
Cooling Performance
Gross Cooling Capacity (Btuh) 63300 100600 127800 188600 246800 322000
DesignCFM 2000 3200 4000 6000 8000 10000
Compressor - Type Scroll
NumberUsed 1 2222 2
EvaporatorCoil - Type Copper Tubes, Aluminum Fins
Face Area (sq. ft.) 5.00 9.37 10.50 15.11 19.00 19.79
Rows/FPI 3/12 3/12 3/13 3/12 3/14 4/12
Condenser- Type Coaxial
Number Used/Tons Capacity 1/5 2/4 2/5 2/7.5 2/10 3/7.5
Nominal Water flow rate (gpm) 15 24 30 45 60 75
Unit Water Connection Size 1” FPT 1-1/4” FPT 1-1/4” FPT 1-1/2” FPT 2” FPT 2” FPT
Evaporator Fan - Type Centrifugal, ForwardCurved
NumberUsed 1 1122 2
Diameter x Width (in.) 12x9 15x12 15x12 15x9 15x11 15x11
Drive Adjustable Belt
Motor HP (Standard/Oversize) 0.75/1 1.5/2 2/3 3/5 5/7.5 7.5/10
Filters
Number Used-Size (in.) 2-20x16 4-14x25x2 6-14x20x2 2-16x20x2
CondensateDrain Connection 3/4 FPT
Weight
Shipping 625 815 975 1350 1525 1825
NOTE: Cooling performance is rated at 80 degrees F dry bulb 67 degrees F wet bulb entering air temperature, CFM listed,
85 degrees F entering 95 degrees F leaving water temperature, and water flow rate listed.
Gross capacity does not include the effect of evaporator fan motor heat.
4-16x25x2
6-20x25x2 8-20x20x2
Note: The water cooled coaxial condensers in these units
have copper tubing and are NOT suitable for salt or brackish
water. Do not install these units outdoors, or in any area
where the surrounding temperature may drop below 32
degrees F.
Unitary Products Group 5
Page 6
036-33072-001 Rev. A (0601)
DIMENSIONAL DATA
FIGURE 2 : DIMENSIONS CU060/CU096/CU120
6 UnitaryProductsGroup
Page 7
036-33072-001 Rev. A (0601)
Unitary Products Group 7
FIGURE 3 : DIMENSIONS CU180
Page 8
036-33072-001 Rev. A (0601)
FIGURE 4 : DIMENSIONS CU240/CU300
WATER PIPING
All factory installed water piping terminates inside the unit.
Multi-condenser units feature manifolded single water in and
out connections.
Note: Water connection fittings are threaded copper. Use
caution when tightening steel pipe into copper fittings. Always
use a backing wrench on the hex fittings inside the unit.
It is recommended that flexible connectors be provided on
the water supply and return lines if noise and vibration transmission could be a problem.
8 UnitaryProductsGroup
Water piping should include shutoff/balancing valves so that
the unit can be serviced without shutting down and draining
the entire water supply circuit. Since units are piped in parallel piping circuits, the shutoff valves may be used to equalixe
the pressure drop to each branch for even condenser water
distribution. A bibcock or a plugged tee fitting should be
installed between the shut-off v alves and the unit in both the
inlet and outlet pipes. These connections are to provide for
acid cleaning of the condenser, if this should become necessary.
Page 9
036-33072-001 Rev. A (0601)
CONDENSOR PRESSURE CONTROL
Waterregulating valves provide control of the quantity of condenser water supplied to the unit by sensing the condensing
temperature. The factory installed Condenser Pressure Control option provides a regulating valve for each internal condenser water circuit.
The water regulating valve needs to be adjusted to maintain a
leaving water temperature between 90 degrees F and 100
degrees F. If using a refrigerant discharge pressure gauge,
adjust the water valve to maintain a condensing pressure or
170 to 220 PSIG. The valve is adjusted by turning the 1/4 inch
square shaft on top of the spring housing. Turning the adjusting screw counter clockwise will raise the opening pressure
and raise the condensing pressure being maintained. Turning
the adjusting screw clockwise will lower the opening point
and lower the condensing pressure being maintained. If
mains water is being used, make sure the valve closes soon
after the compressor stops. If the flow does not stop after a
few minutes, raise the opening pressure by turning the
adjusting shaft caunter clockwise until the flow stops.
If the unit is running on mains water, we recommend adjusting the water regulating valve to give 100 degrees F leaving
water temperature or 220 PSIG condensing temperature.
This will give the best compromise between low water flow
and high operating efficiency. If the condenser water is being
re-circulated through a cooling tower or a chilled water system, it is recommended that the water regulating valve to set
for a lower condensing temperature. This will provide higher
efficiency, lower operating cost and lower sound level. The
minimum condensing pressure required for satisfactory
expansionvalve operation is 170 PSIG.This corresponds to a
leaving water temperature of 90 degrees F.
Unitary Products Group 9
Page 10
036-33072-001 Rev. A (0601)
FIGURE 5: WATERSIDE PRESSURE DROP
(STANDARD UNIT - MANIFOLDED CONDENSERS)
10 UnitaryProductsGroup
Page 11
DUCTWORK
036-33072-001 Rev. A (0601)
When installing ductwork, adhere to local Codes and sensible
practice. Minimize duct runs and avoid abrupt changes in
direction where possible. Allow ample access space for servicing of the coils and changing of filters. Perform regular
maintenance on ducts to increase unit life, maintain efficient
operation, and reduce accumulation of explosive dust. Refer
to blower performance charts, and engineer duct runs and
accessory pressure drop so as not to exceed maximum
external static values.
Canvasor other types of flexible collars are recommended for
connecting the air ducts to the unit. The supply air duct collar
can be connected directly to the blower outlet flanges. Return
air may be ducted to the unit, or drawn directly from the conditioned space (5-15 ton models with optional return air grille)
or mechanical room (20 and 25 ton models). If a ducted
return is desired, duct connection flanges may be secured
directlytotheairintakeopeningofthe5through15tonunits
-filters are accessible from the right hand side. The filter
frame on 20 and 25 ton m odels has duct attachment flanges
incorporated into the filter rack.
SUPPLY AIR/RETURN AIR CONFIGURATION
All models are field convertible for multiple supply/return configurations. The 5 through 15 ton models feature a removable
upper fan module that can be rotated 180° for top rear discharge applications. In addition, the blower outlet panel may
be interchanged with the front panel of the fan module. Interchanging these two panels allows horizontal fan discharge to
either front or rear of the unit.
The blower outlet panel may also be interchanged on the 20
and 25 ton units to provide horizontal discharge.
FIGURE 6 : SUPPLY AIR/RETURN AIR CONFIGURATION
Unitary Products Group 11
Page 12
036-33072-001 Rev. A (0601)
EVAPORATOR BLOWER DISCHARGE
CONVERSION
WARNING
All models can be field converted to the alternate evaporator
discharge orientation. All models ship with vertical fan discharge as standard.
Procedure for converting the fan discharge from vertical to
horizontalis similar on all models, single fan or dual fan.
a. Remove blower drive belt on all models with base
mounted motors. Remove the complete fan motor
and drive on models with blower mounted motor
assemblies.
b. Remove the panel attachment screws on the alter-
nate location access panel (front evaporator section
panel on 20 and 25 ton, front blower module panel
on others ). On 5 through 15 ton units, the front roof
support angle must be removed to allow access to
the front panel. Remove the panel and set aside.
c. Remove the panel attachments screws on the
blower outlet mounting panel.Do not remove fasteners securing blowers to panel! The blowers are to
remain attached to the mounting panel at all times.
d. Carefully remove the blower panel assembly from
the evaporator cabinet. Do not allow blower housings to contact the evaporator coil during the
removal. On some models, the housing(s) will have
to be "rotated" to exit through the panel opening.
e. Interchange the blower panel assembly with the
position of the alternate access panel. Exercise care
in locating the panel. Do not allow blower housings
to contact the evaporator coil. Install the attachment
screws and tighten securely.
f. Install the blank access panel into the remaining
evaporator opening. Fasten securely.
g. Relocate the evaporator fan drive motor to the alter-
nate location on 5 through 15 ton unit.
DISCONNECT AND LOCK OUT POWER WHEN
SERVICING UNIT. FAILURE TO DO SO MAY
RESUL T IN PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK.
b. Remove corner connecting brackets which secure
the blower module to the lower evaporator unit.
c. Carefully lift the blower module, and rotate 1800.
Reposition the blower module on top of the evaporator/compressor unit. Reinstall the corner connecting
brackets.
d. Connect new power wire leads, from the evaporator
motor contactor in the electrical box to the motor terminal box. Ensure wires are routed clear of any
moving components. Secure the wiring so that it
does not contactthe evaporator coil.
ELECTRICAL WIRING
Follow local electrical codes when making electrical connections. Units are completely factory wired for normal supply
voltages (ie.208-230, 460, 575/3phase/60hz) Confirm unit
specifications by checking unit data plate. All electrical components are accessible through an independent electrical
panel located on the right hand end of the evaporator/compressor section. The electrical control boxes are located
behind outer access panels. The compressor section electrical cover is provided with wiring diagrams on the inside,
which must be opened to be read.
Provide individual power disconnects for each unit. Install a
secure ground to the bonding lug located in the electrical control panel. If canvas flexible joints are used on ductwork,
install a ground wire to the ductwork as well.
h. Install and adjust drive belts to appropriate tension.
Test run blower and observe operation for unusual
sounds or vibration.
In order to utilize the 'rear vertical' or 'rear horizontal' discharge on 5 through 15 ton models, the upper fan module
must be rotated.
a. Disconnect power wiring at motor terminal box.
12 UnitaryProductsGroup
WARNING
DISCONNECT AND LOCK OUT POWER WHEN
SERVICING UNIT.UNIT MAY START AUTOMATICALLY IF POWER IS NOT DISCONNECTED.
FAILURETODOSOMAYRESULTINPERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK.
IMPORTANT: All wiring must comply with applicable
local and national codes (NEC). Type and location of disconnect switches must comply with all applicable codes.
Page 13
036-33072-001 Rev. A (0601)
Unit requires installer to provide a 24volt thermostat with
appropriate heating and cooling stages as needed. For low
voltage wiring, 18 gauge wire may be used for up to 50 feet
lengths. Low voltage runs up to 125 feet require 16 gauge
wire.
All models are designed for single zone cooling applications,
utilizing space or return air thermostatic controls. A low voltage terminal block is provided for hook-up of conventional or
programmable thermostats.
The CU6300 -25 ton models feature three independent compressor stages. A multi-stage commercial thermostat (ie.
Honeywell T7300 series), or other type of multi-step controller, is recommended for use with these models. Alternatively,
two of the three compressor stages may be wired together to
achieve two step capacity control. Please note that this
arrangement will result in output staging of 33.3% / 66.6%.
Unitary Products Group 13
Page 14
036-33072-001 Rev. A (0601)
TABLE 2: ELECTRICAL DATA - STANDARD MOTORS
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX. FUSE/
# QTY RLA LRA HP RLA RPM AMPACITY CCT. BKR. AMP
CU060A
CU096A
CU120A
CU186A
CU240A
CU300A
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
1@
1@
1@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
3@
3@
3@
19.3
7.5
6.4
13.9
7.1
5.4
19.3
7.5
6.4
25.0
12.0
9.7
33.6
17.3
13.5
32.1
16.4
12.0
123.0
49.5
40.0
88.0
44.0
34.0
123.0
49.5
40.0
164.0
100.0
90.0
225.0
114.0
80.0
195.0
95.0
80.0
1.00
1.00
1.00
1.50
1.50
1.50
2.00
2.00
2.00
3.00
3.00
3.00
5.00
5.00
5.00
7.50
7.50
7.50
3.1
1.6
1.3
4.5
2.2
1.8
6.0
3.0
2.4
8.4
4.2
3.4
14.0
6.6
5.7
22.2
10.8
8.4
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
27.23
10.98
9.30
35.78
18.18
13.95
49.43
19.88
16.80
64.65
31.20
25.23
89.60
45.53
36.08
126.53
64.10
47.40
TABLE 3: ELECTRICAL DATA - OVERSIZE MOTORS
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX. FUSE/
# QTY RLA LRA HP RLA RPM AMPACITY CCT. BKR. AMP
CU060A
CU096A
CU120A
CU186A
CU240A
CU300A
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
208-230/3/60
460/3/60
575/3/60
Notes: Data shown for packaged unit installation, with single point power supply.
1@
1@
1@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
2@
3@
3@
3@
19.3
7.5
6.4
13.9
7.1
5.4
19.3
7.5
6.4
25.0
12.0
9.7
33.6
17.3
13.5
32.1
16.4
12.0
123.0
49.5
40.0
88.0
44.0
34.0
123.0
49.5
40.0
164.0
100.0
90.0
225.0
114.0
80.0
195.0
95.0
80.0
1.50
1.50
1.50
2.00
2.00
2.00
3.00
3.00
3.00
5.00
5.00
5.00
7.50
7.50
7.50
10.00
10.00
10.00
3.1
1.6
1.3
4.5
2.2
1.8
6.0
3.0
2.4
8.4
4.2
3.4
14.0
6.6
5.7
22.2
10.8
8.4
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
3600
3600
3600
28.63
11.58
9.80
37.28
18.98
14.55
51.83
21.08
17.80
70.25
33.60
27.53
97.80
49.73
38.78
129.93
64.90
48.10
45
15
15
45
25
15
60
25
20
80
40
30
110
60
45
150
80
50
45
15
15
50
25
15
70
25
20
90
45
35
125
60
50
150
80
60
Min. Circuit Ampacity ( MCA ) = 1.25 X Largest single motor amps (FLA or RLA) + sum of the remaining 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 calculated value
14 UnitaryProductsGroup
Page 15
036-33072-001 Rev. A (0601)
Unitary Products Group 15
TABLE 1: SUPPLY AIR BLOWER PERFORMANCE
MODEL#SUPPLY
CFM
EXTERNAL STATIC PRESSURE - Inches 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
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
CU060A
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 9310.7910010.8810670.971129 1.06 1189 1.15 1247 1.25 1305 1.35 1363 1.45 1419 1.55 - - - - - - - - - - - -
CU096A
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 - - - - - - - - - - - - - -
CU120A
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 - - - - - - - - - - - -
CU180A
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 - - - - - - - - - - - - - -
CU240A
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 6.46
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 - - - - - - - -
CU300A
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 - -
10000 878 5.29 920 5.67 960 6.05 999 6.43 1037 6.82 1074 7.21 1111 7.61 1147 8.01 1182 8.41 1216 8.82 1250 9.22 1238 9.63 1315 10.04 - - - 11000 958 6.95 996 7.37 1033 7.79 1069 8.21 1104 8.63 1139 9.05 1173 9.48 1206 9.92 - - - - - - - - - - - - - -
NOTE:
At higher evaporator airflows and wet bulb conditions, condensate carry-over may occur. Adjust airflow downward as necessary.
Values includepressuredrop from wet coil and clean filters.
Shaded areas indicate oversize motor and/or drive set required.
Page 16
036-33072-001 Rev. A (0601)
MOTOR AND PULLEY DATA
TABLE 4: STANDARD BLOWE R MOTOR AND DRIVE DATA
Model Drive Range
CU060 843-1167 1 143 1800 82.5 2.4-3.4 5.2 4L-330 1
CU096 632-875 1-1/2 145 1800 84.0 2.4-3.4 7.0 4L-410 1
CU120 659-913 2 145 1800 84.0 2.4-3.4 6.7 A38 1
CU180 724-925 3 182 1800 86.5 3.4-4.4 8.5 A38 1
CU240 806-1012 5 184 1800 87.5 4.4-5.6 9.9 B60 1
CU300 892-1098 7-1/2 213 1800 88.5 4.9-6.1 9.4 BX60 1
(RPM)
HP Frame
TABLE 5: OVERSIZE BLOWER MOTOR AND DRIVE DATA
Model Drive Range
CU060 1034-1432 1-1/2 145 1800 84.0 2.4-3.4 4.2 4L-320 1
CU096 711-984 2 145 1800 84.0 2.4-3.4 6.2 A37 1
CU120 875-1118 3 145 1800 86.5 3.4-4.4 7.0 A40 1
CU180 938-1155 5 184 1800 87.5 4.9-6.1 9.4 A42 1
CU240 1010-1191 7-1/2 213 1800 88.5 5.3-6.3 9.4 B59 1
CU300 1033-1296 10 213 3600 88.5 4.4-5.6 15.4 BX70 1
(RPM)
HP Frame
Motor Adjustable
Size
Motor Adjustable
Size
RPM Eff.
RPM Eff.
(%)
(%)
Motor Pulley
Pitch Dia. (in.)
Motor Pulley
Pitch Dia. (in.)
Fixed Blower
Pulley Pitch
Dia. (in.)
Fixed Blower
Pulley Pitch
Dia. (in.)
Designation Qty.
Designation Qty.
Belts
Belts
BLOWER SPEED ADJUSTMENT
The RPM of the supply air and condenser air blowers will
depend on the required CFM, and the s tatic resistances of
both the supply/discharge and the return/intake duct systems.
With this information, the RPM for the blowers can be determined from the blower performance tables. Adjustment of
blower speed is accomplished as follows:
a. Loosen belt tension by moving motor towards the
blower shaft via the adjustable mounting.
b. Loosen the setscrew in the adjustable motor pulley
flange. Remove external key on pulleys 4 in. dia and
larger.
c. Slower speed will increase when moveable flange is
adjusted towards the fixed flange (closed). Blower
speed will decrease when the moveable flange is
adjusted away from the fixed flange (opened). Pulleys are adjustable only in half-turn increments. Do
not ODen Dullev 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 and
tighten the adjustment setscrew. Proper torque is
110-130 in.-Ibs.
e. Install drive belt and adjust motor mount to tension
belt.
START-UP AND OPERATION
CAUTION
PRIOR TO STARTING UNIT FOR THE FIRST
TIME, TURN THE THERMOSTAT SYSTEM
SWITCH TO OFF - OR RAISE THE COLLING
SETPOINT TO THE HIGHEST TEMPERATURE
TO PREVENT THE UNIT FROM STARTING,
THEN CLOSE THE ELECTRICAL DISCONNECT
SWITCH.
Startunit and check rotation of fans and compressors.
Scroll compressors will only compress in one rotational direc-
tion. Three phase compressors will rotate in either direction
depending upon phasing of the power.Since there is a 50-50
chance of connecting power in such a way as to cause rotation in the reverse direction, it is important to ensure
proper rotation direction is achieved when the system is
installed and operated.
Verification of proper direction is made by observing that suction pressure drops and discharge pressure rises when the
compressor is energized. Reverse rotation also results in an
elevated sound level as well as substantially reduced current
draw.
16 UnitaryProductsGroup
Page 17
036-33072-001 Rev. A (0601)
There is no negative impact on durability caused by operating
three pase Scroll compressors in the reversed direction for a
short period of time (under one hour). However, after s everal
minutes of operation, the compressors internal protector will
trip.
If opposite rotation is needed, disconnect and reverse any
two leads of the three phase supply. Reconnect power and
observe for correct rotation.
Observe unit operation and check for unusual noise or vibration.
TABLE 6: REFRIGERANT CHARGES
Ref. Charge 5
No. of Cir-
cuits
Per Circuit
(LB)
TON8TON10TON15TON20TON25TON
12 2 2 2 3
4.625 4.188 5.125 7.000 8.750 7.500
TABLE 7: PRESSURE SWITCH SETTINGS (ALL)
High Low
Cut Out (PSIG) 400 25
Cut In (PSIG) 275 60
Unitary Products Group 17
Page 18
036-33072-001 Rev. A (0601)
FIGURE 7 : TYPICAL WIRING DIAGRAM; 208-230V/3PH/60 HZ
18 UnitaryProductsGroup
Page 19
036-33072-001 Rev. A (0601)
MAINTENANCE/SERVICE
CAUTION
Exercise care when working around the sharp
metal edges of door panels or door frames, etc.
These edges can cause injury.
WARNING
DISCONNECT AND LOCK OUT POWER WHEN
SERVICING UNIT. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK.
FILTERS
Inspect filters monthly and replace as necessary. Use UL
Class 2 rated filters. Factory supplied filters are medium efficiency, extended surface pleated type. Replacements should
be of the same type, to maintain optimum airflow performance.
EVAPORATOR AND CONDENSER COILS
Inspect the evaporator coil at filter change intervals. Inspect
the condenser coil at least semi-annually. A dirty condenser
coil will result in elevated condensing pressures and poor unit
performance. Dirty or clogged evaporator coils causes low
suction pressure and lost capacity. If the coils appear dirty,
clean them using mild detergent or a commercial coil cleaning agent.
BLOWERS
Inspect both the evaporator and condenser blowers at each
regular service interval. Clean blower wheels as needed.
Bearings are permanently sealed ball type, and do not
require lubrication. Check bearings for any signs of wear (
movement between inner and outer races ). Ensure bearing
locking collars are secure to the shaft, and that collar locking
screw is properly set. Check that the blower wheel is tight on
the shaft, and that the hub set screws are properly torqued.
DRIVE BELTS
Examine belts periodically for wear. Glazed areas on the
drive surfaces indicate overheating due to belt slippage. Ideal
tension is the lowest tension at which the belt will not slip
under peak load conditions. Over-tensioning shortens belt
and bearing life.
FIGURE 8 : TENSION INFORMATION
REFRIGERANT CIRCUIT(S)
With the unit operating, check and record the compressor
discharge and suction pressures. The compressor running
The tension on the belt should be adjusted for a deflection of
1164 of an inch per inch of belt span, with the appropriate
force applied at the midpoint of the span. Tension"New" belts
at the maximum value indicated. Used belts should be maintained at the minimum value.
current should also be recorded. A maintenance 'og of these
readings can indicate if the unit is operating within it's normal
limits. Abnormal readings should be investigated, and the
Cause corrected.
Unitary Products Group 19
Page 20
Subject to change without notice. Printed in U.S.A. 036-33072-001 Rev. A (0601)
Copyright © by Unitary ProductsGroup 2000. All rights reserved. Supersedes: Nothing
Unitary 5005 Norman
Product York OK
Group Drive 73069
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