Bryant 764A User Manual

installation, start-up and  
service instructions  
PACKAGED AIR  
CONDITIONERS  
564A  
Sizes 024-060  
764A  
Sizes 024-060  
Cancels: II 564A-24-1  
II 564A-24-2  
6/1/96  
IMPORTANT — READ BEFORE INSTALLING  
1. Read and become familiar with these installation in-  
structions before installing this unit (Fig. 1). Retain these  
instructions for future maintenance and repair.  
2. Be sure the installation conforms to all applicable local  
and national codes. Wear safety glasses and work gloves.  
Use quenching cloth for unbrazing operations. Have fire  
extinguisher available for all brazing operations.  
CONTENTS  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11  
I. Locate the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
II. Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
III. Unit Duct and Field Connections . . . . . . . . . . . . . . 5  
Fig. 1 — Unit 564A and 764A (Size 036 Shown)  
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,12  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12,13  
I. Heating Section Start-Up and Adjustments . . . . 12  
II. Cooling Section Start-Up and Adjustments . . . . 12  
III. Indoor Airflow and Airflow Adjustments . . . . . . . 13  
symbol  
. Danger identifies the most serious hazards which  
will result in severe personal injury or death. Warning indi-  
cates  
a
condition that could result in personal injury.  
Caution is used to identify unsafe practices which would  
result in minor personal injury or product and property  
damage.  
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . 14  
I. Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
II. Evaporator Fan and Motor . . . . . . . . . . . . . . . . . . 14  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-18  
I. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
II. Evaporator Fan and Motor . . . . . . . . . . . . . . . . . . 15  
III. Condenser Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
IV. Electrical Controls and Wiring . . . . . . . . . . . . . . . 16  
V. Indoor Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
VI. Metering Device Servicing . . . . . . . . . . . . . . . . . . 16  
VII. Liquid Line Strainer . . . . . . . . . . . . . . . . . . . . . . . . 16  
VIII. Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . 16  
IX. Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . 16  
WARNING: Before performing service or main-  
tenance operations on system, turn off main power  
switches to unit. Turn off accessory heater power switch  
if applicable. Electric shock can cause personal injury.  
1. The power supply (volts, phase, and hertz) must corre-  
spond to that specified on unit rating plate.  
2. The electrical supply provided by the utility must be suf-  
ficient to handle load imposed by this unit.  
3. Refer to Installation, Locate the Unit section (page 5)  
and Fig. 2-4 for locations of electrical inlets, condensate  
drain, duct connections, and required clearances before  
setting unit in place.  
4. This installation must conform with local building codes  
and with NEC (National Electrical Code) or NFPA  
(National Fire Protection Association) 54 TIA-54-84-1.  
Refer to provincial and local plumbing or wastewater codes  
and other applicable local codes.  
COOLING TROUBLESHOOTING CHART . . . . . . . . . . . . 19  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1  
SAFETY CONSIDERATIONS  
WARNING: Improper installation, adjustment, alter-  
ation, service, maintenance, or use can cause explo-  
sion, fire, electric shock, or other occurrences which may  
injure you or damage your property. Consult a quali-  
fied installer or service agency for information or assis-  
tance. The qualified installer or agency must use only  
factory-authorized kits or accessories when modifying  
this product.  
5. Approved for outdoor installation on wood flooring or on  
class A, B, or C roof covering materials.  
INSTALLATION  
All units can be connected into existing duct systems that are  
sized properly and designed to handle the airflow shown in  
the Air Delivery table and Indoor Airflow and Airflow Adjust-  
ments section.  
Recognize safety information. This is the safety-alert symbol  
(
). When you see this symbol on the unit and in instruc-  
tions or manuals, be alert to the potential for personal  
injury.  
NOTE: When installing any accessory item, see the manu-  
facturer s installation instructions packaged with the acces-  
sory. Use factory-authorized kits or accessories when  
modifying this unit.  
Understand the signal words — DANGER, WARNING, and  
CAUTION. These words are used with the safety-alert  
LEGEND  
UNIT  
WEIGHT  
CENTER OF GRAVITY mm [in.]  
UNIT  
564A/764A  
ELECTRICAL  
CHARACTERISTICS  
NEC  
National Electrical Code  
REQUIRED CLEARANCES TO COMBUSTIBLE  
MATERIAL, mm [in.]  
Top of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 0  
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Lb Kg  
X
Y
Z
042  
048  
208/230-1-60, 208/230-3-60 297 135 355.6 [14.00] 508.0 [20.00] 304.8 [12.00]  
208/230-1-60, 208/230-3-60 310 114 355.6 [14.00] 508.0 [20.00] 304.8 [12.00]  
NEC REQUIRED CLEARANCES, mm [in.]  
Between Units, Power Entry Side . . . . . . . 1066.8 [42.00]  
Unit and Ungrounded Surfaces,  
Power Entry Side . . . . . . . . . . . . . . . . . 914.0 [36.00]  
Unit and Block or Concrete Walls and Other  
Grounded Surfaces, Power Entry Side . . . . 1066.8 [42.00]  
REQUIRED CLEARANCES FOR SERVICING, mm [in.]  
Condenser Coil Access Side . . . . . . . . . . . . 762.0 [30.00]  
Power Entry Side  
(Except for NEC Requirements) . . . . . . . . . 762.0 [30.00]  
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . 914.0 [36.00]  
Side Opposite Ducts . . . . . . . . . . . . . . . . . 762.0 [30.00]  
NOTES:  
1. Clearances must be maintained to prevent recirculation of  
air from condenser-fan discharge. With the exception of the  
condenser coil (914 mm [36 in.]), a removable fence or bar-  
ricade requires no clearance.  
2. Dimensions are in millimeters. Dimensions in [ ] are in inches.  
Fig. 3 — Base Unit Dimensions — 564A/764A042,048  
—3—  
LEGEND  
UNIT  
WEIGHT  
CENTER OF GRAVITY mm [in.]  
UNIT  
ELECTRICAL  
NEC  
National Electrical Code  
564A/764A CHARACTERISTICS  
REQUIRED CLEARANCES TO COMBUSTIBLE  
MATERIAL, mm [in.]  
Top of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Duct Side of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Side Opposite Ducts . . . . . . . . . . . . . . . . . . . . . . . . 0  
Bottom of Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0  
Lb Kg  
X
Y
Z
230-1-60, 208/230-3-60,  
060  
350 159 355.6 [14.00] 508.0 [20.00] 355.6 [14.00]  
460-3-60  
NEC REQUIRED CLEARANCES, mm [in.]  
Between Units, Power Entry Side . . . . . . . 1066.8 [42.00]  
Unit and Ungrounded Surfaces,  
Power Entry Side . . . . . . . . . . . . . . . . . 914.0 [36.00]  
Unit and Block or Concrete Walls and Other  
Grounded Surfaces, Power Entry Side . . . . 1066.8 [42.00]  
REQUIRED CLEARANCES FOR SERVICING, mm [in.]  
Condenser Coil Access Side . . . . . . . . . . . . 762.0 [30.00]  
Power Entry Side  
(Except for NEC Requirements) . . . . . . . . . 762.0 [30.00]  
Unit Top . . . . . . . . . . . . . . . . . . . . . . . . 914.0 [36.00]  
Side Opposite Ducts . . . . . . . . . . . . . . . . . 762.0 [30.00]  
NOTES:  
1. Clearances must be maintained to prevent recirculation of  
air from condenser-fan discharge. With the exception of the  
condenser coil (914 mm [36 in.]), a removable fence or bar-  
ricade requires no clearance.  
2. Dimensions are in millimeters. Dimensions in [ ] are in inches.  
Fig. 4 — Base Unit Dimensions — 564A/764A060  
—4—  
I. LOCATE THE UNIT  
A. Clearance  
Provide sufficient space for condenser airflow clearance, wir-  
ing, and servicing unit. See Fig. 2-4. Locate unit where supply-  
and return-air ducts can be conveniently brought out to unit  
duct connections.  
Un it m a y be p la ced w ith d u ct sid e a s close to bu ild in g  
a s top r em ova l, d u ct con n ection s, a n d p ow er con n ec-  
tion s p er m it. Position unit so water or ice from roof does  
not drop directly on top of unit or in front of coil. Make pro-  
visions for condensate drainage. Maintain a 4 ft clearance above  
unit for vertical air discharge.  
MAXIMUM ALLOWABLE  
DIFFERENCE (in.)  
A-B  
B-C  
A-C  
1
1
1
4  
4
4  
Fig. 5 — Unit Leveling Tolerances  
Roof installation method for units depends on building con-  
struction and special requirements of local building codes.  
Be sure that roof can support unit weight.  
Maintain clearance around and above unit to provide proper  
airflow and service access. See Fig. 2-4.  
CAUTION: Do not restrict condenser airflow. An air  
restriction at either the condenser air inlet (the entire  
surface of the condenser coil) or the fan discharge can  
be detrimental to compressor life.  
The condenser fan discharges through the top of the unit.  
Ensure that the fan discharge does not recirculate to the con-  
denser coil. Do not locate the unit either in a corner or under  
a complete overhead obstruction, and ensure the following clear-  
ances are provided:  
On roof overhangs, provide a minimum clearance of 48 in.  
above the top of the unit for partial overhangs (such as a  
normal house roof overhang). If there is a horizontal exten-  
sion on the partial overhang, extension must not exceed  
48 inches. For extended overhangs, provide a minimum clear-  
ance of 36 in. between unit and overhang.  
NOTES:  
1. Extend a 24-in. gravel apron around pad.  
2. Provide a 30-in. service clearance at front and rear sides of unit.  
Provide a minimum clearance of 42 in. for the control box  
side next to a block wall or any other grounded surface. Pro-  
vide a minimum clearance of 36 in. between the control box  
side of the unit and any electrically live parts.  
Fig. 6 — Pad Dimensions  
Unit may be installed on wood flooring, or on Class A, B, or C  
roof covering materials.  
III. UNIT DUCT AND FIELD CONNECTIONS  
A. Condensate Disposal  
Although unit is weatherproof, guard against water from higher  
level runoff and overhangs.  
Units should be at least 4 in. above the highest expected wa-  
ter, flood, and runoff levels. Do not use the unit if it has been  
under water.  
NOTE: Ensure that condensate-water disposal methods com-  
ply with local codes, restrictions, and practices.  
3
Units remove condensate water through a  
cated on the control box side of the unit.  
4-in. ID hole lo-  
B. Ground-Level Installation  
Mount unit on a solid, level pad. See Fig. 5 for unit leveling  
tolerances. Construct pad as shown in Fig. 6. Side of unit with  
condensate trap should be flush with pad for proper trap po-  
sitioning (see Fig. 2-4). Extend a 24-in. gravel apron around  
pad for condensate drainage.  
Condensate water can be drained directly onto a gravel apron  
in ground-level installations. Install a field-supplied conden-  
sate trap at end of condensate connection to ensure proper  
drainage. See Fig. 7. Make sure that the outlet of the trap is  
at least 1 in. lower than the drain pan condensate connection  
to prevent the pan from overflowing. See Fig. 8A and 8B. Prime  
the trap with water. When using a gravel apron, make sure  
it slopes away from the unit.  
II. RIG AND PLACE UNIT  
Inspect unit for transportation damage. File any claim with  
transportation agency. Keep upright and do not drop. Level  
by using unit frame as a reference. See Table 1 for additional  
information. Weight is shown in Fig. 2-4. Unit can be moved  
with handholds provided in the unit basepan.  
—5—  
Table 1 — Physical Data  
UNIT 564A AND 764A  
OPERATING WEIGHT (lb)  
COMPRESSOR TYPE  
024  
030  
036  
042  
048  
060  
222  
236  
250  
297  
310  
350  
Reciprocating  
REFRIGERANT  
Charge (lb)  
R-22  
2.8  
3.9  
4.7  
4.4  
6.1  
7.5  
REFRIGERANT METERING DEVICE  
Acutrol™ System  
CONDENSER COIL  
Rows...Fins/in.  
Total Face Area (sq ft)  
Copper Tubes, Aluminum Plate Fins  
1...17  
6.7  
1...17  
7.9  
2...17  
6.2  
1...17  
11.1  
2...17  
8.6  
2...17  
10.7  
CONDENSER-FAN MOTOR  
Cfm  
Propeller  
1600  
2000  
2000  
2600  
2600  
2800  
Nominal Rpm  
Motor Hp  
825  
1100  
1100  
1100  
1100  
1100  
1
1
1
1
1
1
8
4
4
4
4
4
Diameter (in.)  
20  
20  
20  
20  
20  
20  
EVAPORATOR COIL  
Rows...Fins/in.  
Total Face Area (sq ft)  
Copper Tubes, Aluminum Plate Fins  
2...15  
2.8  
3...15  
2.8  
3...15  
3.1  
3...15  
3.9  
3...15  
4.3  
4...15  
4.9  
EVAPORATOR-FAN MOTOR  
Blower Motor Size (in.)  
Nominal Cfm  
Direct Drive  
10 x 8  
800  
10 x 8  
1000  
10 x 8  
1200  
10 x 9  
1400  
10 x 9  
1600  
10 x 10  
2000  
950-1100  
3*  
Rpm Range  
550-1000  
3
550-1000  
3
800-1050  
3
800-1050  
3
Med  
1000-1100  
2
Number of Speeds  
Factory Speed Setting  
Motor Hp  
Low  
Med  
Low  
Low  
Low  
1
1
1
1
3
4
4
2
2
4
1
CONNECTING DUCT SIZES  
Supply Air (in.)  
Return Air (in.)  
Round  
14  
14  
Square  
13.9 x 13.9  
13.9 x 27.8  
FIELD-SUPPLIED RETURN AIR FILTER†  
Throwaway (in.)  
24 x 24  
24 x 24  
24 x 24  
24 x 24  
24 x 30  
24 x 30  
*460-v motors are 2-speed only.  
†Required filter sizes shown are based on the ARI (Air Conditioning and Refrigeration Institute)  
rated airflow at a velocity of 300 ft/min for throwaway type or 450 ft/min for high capacity type.  
Recommended filters are 1-in. thick.  
Fig. 8B — Condensate Trap (Using PVC Piping)  
If the installation requires draining the condensate water  
away from the unit, install a field-supplied 2-in. trap using  
3
4-in. OD tubing or piping to ensure proper drainage. See  
Fig. 8A and 8B. Make sure that the outlet of the trap is at  
least one in. lower than the unit drain pan condensate con-  
nection to prevent the pan from overflowing. Connect a drain  
CONDENSATE DRAIN HOLE  
3
3
3
tube using a minimum of 4-in. PVC, 4-in. CPVC, or  
4-in.  
copper pipe (all field-supplied). Do not undersize the tube. Pitch  
the drain tube downward at a slope of at least 1 inch in every  
10 ft of horizontal run. Be sure to check the drain tube for  
leaks. Prime trap at the beginning of cooling season start-up.  
Allowable glues for condensate trap connection are: Stand-  
ard ABS, CPVC, or PVC cement.  
Fig. 7 — Condensate Connection Details  
B. Field-Duct Connections  
NOTE: The design and installation of the duct system must  
be in accordance with the standards of NFPA for the instal-  
lation of nonresidence-type air conditioning and ventilating  
systems, NFPA 90A or residence-type, NFPA 90B, and/or  
local codes and ordinances.  
Units have duct flanges on the supply- and return-air open-  
ings on the side of the unit. See Fig. 2-4 for connection sizes  
and locations.  
Fig. 8A — Condensate Trap (Using Tubing)  
—6—  
Install Flanges for Ductwork Connections (564A/764A060 only)  
4. Install 2 hand-formed flanges onto return air opening  
in holes provided to form rectangle around the return  
air opening.  
The size 060 units are shipped with flanges which must be  
field-installed on the unit.  
5. Install remaining 2 hand-formed flanges around dis-  
charge air opening in holes provided.  
To install unit flanges:  
1. Five pieces of flange are shipped on the return air open-  
ing of the unit. Remove the flanges from the shipping  
position. See Fig. 9. Screws are field-supplied.  
6. Ductwork can now be attached to flanges.  
Adhere to the following criteria when selecting, sizing, and  
installing the duct system:  
2. One piece of flange is used as it is shipped (straight).  
Bend the other 4 pieces at right angles.  
1. Select and size ductwork, supply-air registers, and return-  
air grilles according to ASHRAE (American Society of  
Heating, Refrigeration, and Air Conditioning Engi-  
neers) recommendations.  
3. Install the straight flange on the right side of the re-  
turn air opening in holes provided. See Fig. 10. Flanges  
should stick out from unit to allow for connection of  
ductwork.  
CAUTION: When drilling the duct system fastening  
holes into the side of the unit for duct flanges, do not  
3
drill deeper than  
4
in., and use extreme care not to  
puncture the coil or coil tubes. See Fig. 11.  
2. Use flexible transition between rigid ductwork and unit  
to prevent transmission of vibration. The transition may  
be screwed or bolted to duct flanges. Use suitable gas-  
kets to ensure weathertight and airtight seal.  
19.17  
3.92″  
Fig. 9 — Shipping Location of Duct Flanges  
(Size 060 Only)  
3
Fig. 11 — Area Not To Be Drilled More Than 4-in.  
3. Size ductwork for cooling air quantity (cfm).  
4. Adequately insulate and weatherproof all ductwork  
located outdoors. Insulate ducts passing through un-  
conditioned space, and use vapor barrier in accordance  
with latest issue of SMACNA (Sheet Metal and Air  
Conditioning Contractors National Association) and ACCA  
(Air Conditioning Contractors of America) minimum  
installation standards for heating and air conditioning  
systems. Secure all ducts to building structure.  
5. Flash, weatherproof, and vibration-isolate all openings  
in building structure in accordance with local codes and  
good building practices.  
6. Air filters should be installed in return-air ductwork.  
Return-air filter grille or filter tracks in duct may be used.  
Figure 12 shows a typical duct system with unit installed.  
Fig. 10 — Installation of Duct Flanges  
(Size 060 Only)  
—7—  
CAUTION: Failure to follow these precautions could  
result in damage to the unit being installed:  
1. Make all electrical connections in accordance with  
NEC ANSI/NFPA (latest edition) and local electrical  
codes governing such wiring. In Canada, all elec-  
trical connections must be in accordance with CSA  
Standard C22.1 Canadian Electrical Code Part 1  
and applicable local codes. Refer to unit wiring  
diagram.  
2. Use only copper conductor for connections between  
field-supplied electrical disconnect switch and unit.  
DO NOT USE ALUMINUM WIRE.  
3. Be sure that high-voltage power to unit is within op-  
erating voltage range indicated on unit rating plate.  
On 3-phase units, ensure that phases are balanced  
within 2%. Consult local power company for correc-  
tion of improper voltage and/or phase imbalance.  
LEGEND  
4. Insulate low-voltage wires for highest voltage con-  
tained within conduit when low-voltage control wires  
are run in same conduit as high-voltage wires.  
Outdoor Airflow  
Indoor Airflow  
NEC  
National Electrical Code  
Power Wiring  
Control Wiring  
5. Do not damage internal components when drilling  
through any panel to mount electrical hardware, con-  
duit, etc.  
*Required for electric heater when single-point connection is not  
used.  
Fig. 12 — Typical Installation  
High-Voltage Connections  
The unit must have a separate electrical service with a field-  
supplied, waterproof disconnect switch mounted at, or within  
sight from the unit. Refer to the unit rating plate for maxi-  
mum fuse/circuit breaker size and minimum circuit amps  
(ampacity) for wire sizing. See Table 2 for electrical data.  
C. Converting Horizontal Discharge Units to Downflow  
(Vertical) Discharge  
The field-supplied disconnect may be mounted on the unit over  
the high-voltage inlet hole. See Fig. 2-4.  
WARNING: Before performing service or mainte-  
nance operations on system, turn off main power to unit.  
Turn off accessory heater power switch if applicable. Elec-  
trical shock can cause personal injury.  
CAUTION: Operation of unit on improper line volt-  
age constitutes abuse and may cause unit damage that  
could affect warranty.  
Units are dedicated side-supply products. Units are not con-  
vertible to vertical air supply. A eld-supplied plenum must  
be used to convert to vertical air discharge.  
Routing Power Leads Into Unit  
Use only copper wire between disconnect and unit. The high-  
voltage leads should be in a conduit until they enter the unit;  
conduit termination at the unit must be watertight. Run the  
high-voltage leads through the hole on the side of the unit  
(see Fig. 13 for location). When the leads are inside the unit,  
run leads to the control box (Fig. 14). For single-phase units,  
connect leads to the black and yellow wires; for 3-phase units,  
connect the leads to the black, yellow, and blue wires (see  
Fig. 15).  
D. Electrical Connections  
WARNING: The unit cabinet must have an un-  
interrupted, unbroken electrical ground to minimize the  
possibility of personal injury if an electrical fault should  
occur. This ground may consist of an electrical wire con-  
nected to the unit ground in the control compartment,  
or conduit approved for electrical ground when  
installed in accordance with NEC, ANSI (American  
National Standards Institute)/NFPA (latest edition)  
(in Canada, Canadian Electrical Code CSA [Canadian  
Standards Association] C22.1) and local electrical codes.  
Failure to adhere to this warning could result in per-  
sonal injury or death.  
Connecting Ground Lead to Unit Ground  
Refer to Fig. 14 and 15. Connect the ground lead to the chas-  
sis using the unit ground screw in the control box.  
Routing Control Power Wires  
Form a drip-loop with the thermostat leads before routing  
them into the unit. Route the thermostat leads through  
grommeted hole provided in unit (see Fig. 13) into unit con-  
trol box. Connect thermostat leads to unit control power leads  
as shown in Fig. 16.  
—8—  
Route thermostat wires through grommet providing a drip  
loop at the panel. Connect low-voltage leads to the thermo-  
stat as shown in Fig. 16.  
rewire transformer primary as described in Special Proce-  
dures for 208-V Operation section on page 11.  
Accessory Electric Heat Wiring  
Refer to accessory electric heat installation instructions for  
information on installing accessory electric heat. Accessory  
electric heat wiring is shown in Fig. 17.  
The unit transformer supplies 24-v power for complete  
system including accessory electrical heater. Transformer is  
factory wired for 230-v operation. If supply voltage is 208 v,  
HIGH-VOLTAGE  
POWER WIRING WIRING ENTRY  
ENTRY HOLE HOLE  
LOW-VOLTAGE  
LEGEND  
NEC  
National Electrical Code  
Field Control Wiring  
Fig. 13 — Unit Electrical Connection Entry Holes  
Field Splice  
Fig. 15 — Line Power Connections  
Fig. 16 — Control Connections  
Fig. 14 — Control Box Wiring  
—9—  
Table 2 — Electrical Data  
VOLTAGE  
RANGE  
DISCONNECT  
SIZE  
COMPRESSOR  
OFM  
FLA  
IFM  
ELECTRIC HEAT  
POWER SUPPLY  
NOMINAL  
VOLTAGE  
(V-Ph-Hz)  
UNIT  
564A/764A  
Nominal  
Min  
Max  
RLA  
LRA  
FLA  
FLA  
MCA  
MOCP  
FLA  
LRA  
kW*  
—/—  
—/—  
16.9/ 16.9  
25.6/ 29.0  
48.1/ 55.1  
20/ 20  
30/ 30  
50/ 60  
16/ 16  
24/ 27  
44/ 51  
024  
030  
208/230-1-60  
208/230-1-60  
187  
187  
254  
254  
10.9  
61.0  
0.9  
1.5  
2.4  
2.4  
3.8/ 5.0  
7.5/10.0  
18.1/20.8  
36.1/41.7  
68  
—/—  
—/—  
22.9/ 22.9  
25.6/ 29.0  
48.1/ 55.1  
70.7/ 81.1  
30/ 30  
30/ 30  
50/ 60  
80/ 90†  
22/ 22  
24/ 27  
44/ 51  
65/ 75  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
18.1/20.8  
36.1/41.7  
54.2/62.5  
15.2  
15.9  
69.4  
86.0  
79  
96  
—/—  
—/—  
24.2/ 24.2  
26.1/ 29.5  
48.6/ 55.6  
71.2/ 81.6  
93.6/107.7  
30/ 30  
30/ 30  
23/ 23  
24/ 27  
45/ 51  
66/ 75  
86/ 99  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
18.1/20.8  
36.1/41.7  
54.2/62.5  
72.2/83.3  
208/230-1-60  
208/230-3-60  
208/230-1-60  
208/230-3-60  
208/230-1-60  
208/230-3-60  
230-1-60  
187  
187  
187  
187  
187  
187  
207  
187  
414  
254  
254  
254  
254  
254  
254  
254  
254  
508  
1.5  
1.5  
1.5  
1.5  
1.5  
1.5  
1.4  
1.4  
0.7  
2.8  
2.8  
2.8  
2.8  
4.2  
4.2  
6.2  
6.2  
3.2  
50/ 60  
80/ 90†  
100/110†  
036  
042  
048  
—/—  
—/—  
15.4/ 15.4  
16.5/ 18.5  
29.6/ 33.6  
42.6/ 48.6  
55.6/ 63.6  
20/ 20  
20/ 20  
30/ 35  
45/ 50  
60/ 70†  
15/ 15  
15/ 17  
27/ 31  
39/ 45  
51/ 59  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
10.4/12.0  
20.8/24.1  
31.3/36.1  
41.7/48.1  
8.9  
18.5  
10.9  
21.3  
12.3  
26.9  
17.7  
9.0  
64.5  
97.6  
74  
107  
83  
—/—  
—/—  
27.4/ 27.4  
27.4/ 29.5  
48.6/ 55.6  
71.2/ 81.6  
93.8/107.7  
35/ 35  
35/ 35  
26/ 26  
26/ 27  
45/ 51  
66/ 75  
86/ 99  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
18.1/20.8  
36.1/41.7  
54.2/62.5  
72.2/83.3  
50/ 60  
80/ 90†  
100/110†  
—/—  
—/—  
17.9/ 17.9  
17.9/ 18.5  
29.6/ 33.6  
42.6/ 48.6  
55.6/ 63.6  
25/ 25  
25/ 25  
30/ 35  
45/ 50  
60/ 70†  
17/ 17  
17/ 17  
27/ 31  
39/ 45  
51/ 59  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
10.4/12.0  
20.8/24.1  
31.3/36.1  
41.7/48.1  
73.0  
—/—  
—/—  
32.3/ 32.3  
32.3/ 32.3  
50.4/ 57.3  
72.9/ 83.4  
95.5/109.4  
40/ 40  
40/ 40  
31/ 31  
31/ 31  
46/ 53  
67/ 77  
88/101  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
18.1/20.8  
36.1/41.7  
54.2/62.5  
72.2/83.3  
107.0  
73.0  
60/ 60  
121  
87  
80/ 90†  
100/110†  
—/—  
—/—  
21.1/ 21.1  
21.1/ 21.1  
31.3/ 35.3  
44.3/ 50.4  
57.4/ 65.4  
25/ 25  
25/ 25  
35/ 40  
45/ 60  
60/ 70†  
21/ 21  
21/ 21  
29/ 32  
41/ 46  
53/ 60  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
10.4/12.0  
20.8/24.1  
31.3/36.1  
41.7/48.1  
5.0  
10.0  
15.0  
20.0  
41.2  
41.2  
59.8  
85.9  
111.9  
50  
50  
60  
90†  
125†  
40  
40  
20.8  
41.7  
62.5  
83.3  
128.0  
128.0  
63.0  
55  
141  
146  
71  
79  
103  
—/—  
—/—  
29.7/ 29.7  
29.7/ 29.7  
33.8/ 37.8  
46.8/ 52.9  
59.9/ 67.9  
35/ 35  
35/ 35  
35/ 40  
50/ 60  
60/ 70†  
29/ 29  
29/ 29  
31/ 35  
43/ 49  
55/ 62  
3.8/ 5.0  
7.5/10.0  
11.3/15.0  
15.0/20.0  
10.4/12.0  
20.8/24.1  
31.3/36.1  
41.7/48.1  
060  
208/230-3-60  
5.0  
10.0  
15.0  
20.0  
6.0  
12.0  
18.0  
24.1  
15.2  
15.2  
19.0  
26.6  
34.1  
20  
20  
20  
30  
35  
15  
15  
18  
24  
31  
460-3-60  
EXAMPLE: Supply voltage is 460-3-60  
LEGEND  
FLA  
Full Load Amps  
AB = 452 v  
BC = 464 v  
AC = 455 v  
HACR  
Heating, Air Conditioning and  
Refrigeration  
IFM  
Indoor (Evaporator) Fan Motor  
Locked Rotor Amps  
452 + 464 + 455  
LRA  
MCA  
MOCP  
NEC  
OFM  
RLA  
Average voltage =  
=
3
Minimum Circuit Amps  
Maximum Overcurrent Protection  
National Electrical Code  
457  
Outdoor (Condenser) Fan Motor  
Rated Load Amps  
Determine maximum deviation from average voltage:  
(AB) 457 − 452 = 5 v  
(BC) 464 − 457 = 7 v  
(AC) 457 − 455 = 2 v  
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v, or  
480 v. If power distribution voltage to unit varies from rated heater voltage, heater  
kW will vary accordingly.  
†Fuse or HACR circuit breaker.  
Maximum deviation is 7 v.  
NOTES:  
Determine percentage of voltage imbalance:  
1. In compliance with NEC requirements for multimotor and combination load and  
equipment (refer to NEC Articles 430 and 440), the overcurrent protective de-  
vice for the unit shall be fuse or HACR breaker.  
7
% Voltage imbalance = 100 x  
457  
2. Unbalanced 3-Phase Supply Voltage  
= 1.53%  
Never operate a motor where a phase imbalance in supply voltage is greater  
than 2%. Use the following formula to determine the percentage of voltage  
imbalance.  
This amount of phase imbalance is satisfactory as it is below the maximum  
allowable 2%.  
% Voltage Imbalance  
IMPORTANT: If the supply voltage phase imbalance is more than 2% contact  
your local electric utility company immediately.  
max voltage deviation from average voltage  
= 100 x  
average voltage  
—10—  
Fig. 17 — Electric Heater Wiring  
Special Procedures for 208-V Operation  
PRE-START-UP  
WARNING: Failure to observe the following warn-  
ings could result in serious personal injury:  
WARNING: Make sure that the power supply to the  
unit is switched OFF before making any wiring changes.  
Electrical shock can cause personal injury or death.  
1. Follow recognized safety practices and wear protec-  
tive goggles when checking or servicing refrigerant  
system.  
1. Disconnect the orange transformer-primary lead from  
the contactor. See unit wiring label.  
2. Remove the wirenut from the terminal on the end of the  
red transformer-primary lead.  
2. Do not operate compressor or provide any electric  
power to unit unless compressor terminal cover is in  
place and secured.  
3. Do not remove compressor terminal cover until all  
electrical sources have been disconnected.  
3. Save the wirenut.  
4. Connect the red lead to the contactor terminal from which  
the orange lead was disconnected.  
5. Using the wirenut removed from the red lead, insulate  
the loose terminal on the orange lead.  
6. Wrap the wirenut with electrical tape so that the metal  
terminal cannot be seen.  
4. Relieve and reclaim all pressure from both high- and  
low-pressure sides of the system before touching or  
disturbing anything inside terminal box if refriger-  
ant leak is suspected around compressor terminals.  
5. Never attempt to repair soldered connection while  
refrigerant system is under pressure.  
Indoor blower-motor speeds may need to be changed for 208-v  
operation. Refer to Indoor Airflow and Airflow Adjustments  
section on page 13.  
6. Do not use torch to remove any component. System  
contains oil and refrigerant under pressure. To re-  
move a component, wear protective goggles and pro-  
ceed as follows:  
a. Turn off electrical power to unit.  
Heat Anticipator Setting  
b. Relieve and reclaim all pressure from system.  
The room thermostat heat anticipator must be adjusted prop-  
erly to ensure proper heating performance. Set anticipator  
settings for room thermostat according to separate Accessory  
Electric Heater Installation Instructions.  
c. Cut component connecting tubing with tubing cut-  
ter and remove component from unit.  
d. Carefully unsweat remaining tubing stubs when  
necessary. Oil can ignite when exposed to torch  
flame.  
Failure to make a proper heat anticipator adjustment will  
result in improper operation, discomfort to the occupants of  
the conditioned space, and inefficient energy utilization; how-  
ever, the required setting may be changed slightly to provide  
a greater degree of comfort for a particular installation.  
For unit compressors equipped with accessory crankcase heat-  
ers, heaters are energized as long as there is power to the  
unit. Energize crankcase heater 24 hours prior to unit start-  
up. To energize heater only, set thermostat at OFF position  
and turn on unit main power at disconnect switch.  
E. Accessory Installation  
At this time, any required accessories should be installed  
on the unit. Refer to separate accessory installation  
instructions.  
—11—  
Proceed as follows to inspect and prepare the unit for initial  
start-up:  
4. After the call for heat has been satisfied, the evaporator  
fan will stop. For units equipped with time-delay relay,  
evaporator fan will stop after a 30-second time delay.  
1. Remove all access panels.  
To shut off unit, set system selector switch at OFF position  
or set heating set point lever below room temperature.  
2. Read and follow instructions on all WARNING, CAU-  
TION, and INFORMATION labels attached to, or shipped  
with, unit.  
B. Heating Sequence of Operation  
3. Make the following inspections:  
When power is supplied to unit, transformer (TRAN) is  
energized.  
a. Inspect for shipping and handling damages such as  
broken lines, loose parts, disconnected wires, etc.  
With thermostat set to call for heating, sequence of operation  
is as follows:  
b. Inspect for oil at all refrigerant tubing connections  
and on unit base. Detecting oil generally indicates a  
refrigerant leak. Leak-test all refrigerant tubing con-  
nections using electronic leak detector, halide torch,  
or liquid-soap solution. If refrigerant leak is de-  
tected, see Repairing Refrigerant Leaks section on  
page 15.  
On a call for heat, circuit R-W and R-G are made through  
first-stage thermostat bulb. If accessory electric heaters are  
used, a relay is energized, bringing on first stage of supple-  
mental electric heat and fan. When thermostat is satisfied,  
contacts open, deenergizing relay (on all units) and time-  
delay relay (on units equipped with time-delay relay). Heat-  
ers deenergize, and evaporator fan stops after a 30-second  
time delay (on units equipped with time-delay relay).  
c. Inspect all field- and factory-wiring connections. Be  
sure that connections are completed and tight.  
d. Inspect coil fins. If damaged during shipping and han-  
dling, carefully straighten fins with a fin comb.  
II. COOLING SECTION START-UP AND ADJUSTMENTS  
4. Verify the following conditions:  
CAUTION: Complete the required procedures given  
a. Make sure that condenser fan blade is correctly po-  
sitioned in fan orifice. Top edge of blade should be  
3.125 in. from condenser outlet grille.  
in Pre-Start-Up section, page 11, before starting the unit.  
Do not jumper any safety devices when operating the  
unit.  
Do not operate the compressor when the outdoor tem-  
perature is below 40 F (unless accessory low ambient  
kit is installed).  
b. Make sure that air filter(s) is in place.  
c. Make sure that condensate drain pan and trap are  
filled with water to ensure proper drainage.  
Do not rapid-cycle the compressor.  
d. Make sure that all tools and miscellaneous loose parts  
have been removed.  
5. Compressors are internally spring mounted. Do not loosen  
or remove compressor holddown bolts.  
A. Checking Cooling Control Operation  
Start and check the unit for proper cooling control operation  
as follows:  
6. Each unit system has 2 Schrader-type ports, one low-  
side Schrader fitting located on the suction line, and one  
high-side Schrader fitting located on the compressor dis-  
charge line. Be sure that caps on the ports are tight.  
1. Place room thermostat SYSTEM switch in OFF posi-  
tion. Observe that evaporator-fan motor starts when FAN  
switch is placed in ON position and shuts down after a  
30-second time delay when FAN switch is placed in AUTO.  
position.  
See Start-Up Checklist in back of book. Unit is now ready for  
initial start-up.  
2. Place SYSTEM switch in COOL position and FAN switch  
in AUTO. position. Set cooling control below room tem-  
perature. Observe that compressor, condenser fan, and  
evaporator-fan motors start. Observe that cooling cycle  
shuts down when control setting is satisfied. Evaporator-  
fan motor has off-delay (on units equipped with time-  
delay relay) of approximately 30 seconds on shutdown.  
START-UP  
I. HEATING SECTION START-UP AND ADJUSTMENTS  
(For units with accessory electric heaters.)  
CAUTION: Complete the required procedures given  
3. When using an auto. changeover room thermostat, place  
both SYSTEM and FAN switches in AUTO. positions.  
Observe that unit operates in Heating mode when tem-  
perature control is set to call for heating (above room  
temperature) and operates in Cooling mode when tem-  
perature control is set to call for cooling (below room  
temperature).  
in Pre-Start-Up section on this page before starting unit.  
Do not jumper any safety devices when operating the unit.  
A. Checking Heating Control Operation  
Start and check the unit for proper heating control operation  
as follows:  
1. Turn on unit electrical supply.  
B. Checking and Adjusting Refrigerant Charge  
2. Set system switch selector at HEAT position and fan switch  
at AUTO. or ON position. Set heating temperature  
lever above room temperature.  
The refrigerant system is fully charged with R-22 refriger-  
ant, and is tested and factory-sealed.  
3. The evaporator fan and first-stage heat will start im-  
mediately. If unit is equipped with 2-stage heaters, second-  
stage heat will energize upon a call from W2. Check for  
heating effect at supply diffusers.  
NOTE: Adjustment of the refrigerant charge is not required  
unless the unit is suspected of not having the proper R-22  
charge. See Refrigerant Charge section on page 16 for fur-  
ther details.  
—12—  
C. Unit Controls  
Table 3 — Dry Coil Air Delivery —  
Horizontal Discharge  
Compressor  
High-Pressure Relief Valve Valve is located in compressor.  
Relief valve opens at a pressure differential of approximately  
450 psi between suction (low side) and discharge (high side)  
to allow pressure equalization.  
UNIT  
IFM SPEED  
SETTING  
AIRFLOW  
(Cfm)  
ESP  
POWER  
(Watts)  
564A/764A  
(in. wg)  
Low  
Med  
High  
Low*  
Med  
High  
Low  
Med  
High  
Low*  
Med  
High  
Low  
800  
800  
0.30  
0.65  
0.80  
282  
349  
439  
024  
030  
036  
042  
048†  
060  
800  
Internal Current and Temperature Sensing Overload  
1000  
1000  
1000  
1200  
1200  
1200  
1400  
1400  
1400  
1600  
Device resets automatically when internal compressor motor  
temperature drops to a safe level. When an internal overload  
is suspected of being open, check by using an ohmmeter or  
continuity tester.  
0.35  
0.65  
0.30  
0.50  
0.65  
370  
460  
445  
480  
530  
D. Cooling Sequence of Operation  
NOTE: With the FAN switch in the ON position, 24 v is sup-  
plied to the time-delay relay (TDR) through the G terminal  
on the thermostat. This voltage energizes the coil of the re-  
lay, closing the normally-open set of contacts which provide  
continuous power to the indoor (evaporator) fan motor (IFM).  
Moving the FAN switch back to the AUTO. position (provid-  
ing there is not a call for cooling) deenergizes the TDR (when  
applicable) which deenergizes the IFM after a 30-second de-  
lay. The FAN switch in AUTO. position cycles upon a call for  
cooling.  
0.30  
0.60  
0.50  
495  
571  
650  
High  
Low  
Med**  
High  
1600  
2000  
2000  
2000  
0.65  
0.15  
0.60  
0.65  
720  
900  
850  
945  
LEGEND  
On a call for cooling, 24 v is supplied to the compressor con-  
tactor (C) and TDR simultaneously through the Y and G ter-  
minals of the thermostat, respectively. On units with a com-  
pressor TDR, there is a built-in, 5-minute (±45 seconds) delay  
between compressor starts. Energizing the contactor closes  
the normally-open set of contacts supplying power to both the  
compressor and outdoor (condenser) fan motor (OFM). Ener-  
gizing the TDR closes the normally-open set of contacts pro-  
viding power to the IFM. On the loss of the call for cooling,  
24 v is removed from both the Y and G terminals of the ther-  
mostat (providing the FAN switch is in the AUTO. position),  
deenergizing both the compressor and TDR and opening both  
the contacts supplying power to compressor and OFM. IFM  
has a 30-second delay.  
ESP  
IFM  
External Static Pressure  
Indoor (Evaporator) Fan Motor  
*Unit is factory set on medium speed, this airflow is not obtainable at  
low speed.  
†Size 048 has low and high speed only.  
**460 volt motors do not have a medium speed.  
NOTE: Values for 208/230-v motors are at 230 v; deduct 10% for 208 v.  
A. For 208/230-v Blower Motors:  
The motor leads are color-coded as follows:  
3-SPEED  
2-SPEED  
black  
blue  
red  
=
=
=
high speed  
medium speed  
low speed  
black  
red  
=
=
high speed  
low speed  
III. INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS  
To change the speed of the blower motor, remove the fan mo-  
tor speed leg lead from the indoor (evaporator) fan relay (IFR)  
and replace with lead for desired blower motor speed. Insu-  
late the removed lead to avoid contact with chassis parts.  
CAUTION: For cooling operation, the recommended  
airflow is 350 to 450 cfm per each 12,000 Btuh of rated  
cooling capacity.  
Table 3 shows dry coil air delivery for horizontal discharge  
units.  
B. For 460-v (2-Speed) Blower Motors:  
The motor leads are color coded as follows:  
WARNING: Disconnect electrical power to the unit be-  
fore changing blower speed. Electrical shock can cause  
personal injury or death.  
black  
yellow  
purple  
red  
=
=
=
=
high  
jumper  
jumper  
low  
Airflow can be changed by changing the lead connections of  
the blower motor.  
To change the speed of the blower motor from low speed to  
high speed, remove the red lead from the indoor fan relay  
(IFR). Insulate the red lead to avoid contact with any chassis  
parts. Separate the black lead from the purple jumper. Con-  
nect the black lead to the IFR. Insulate the purple lead to  
avoid contact with any chassis parts.  
Units 564A/764A024, 036, 048, and 060 blower motors are  
factory wired for low speed operation. Units 564A/764A030  
and 042 are factory wired for medium speed operation.  
—13—  
CARE AND MAINTENANCE  
I. AIR FILTER  
CAUTION: Never operate the unit without a suit-  
NOTE: The following steps should be performed by a quali-  
fied service person.  
able air filter in the return-air duct system. Always re-  
place the filter with the same dimensional size and type  
as originally installed. See Tables 1 and 2 for recom-  
mended filter sizes.  
WARNING: Before installing or servicing unit, turn  
off main power to system to avoid shock hazard or in-  
jury from rotating parts. There may be more than one  
disconnect switch. Turn off accessory heater power if ap-  
plicable. Electrical shock can cause personal injury or  
death.  
Inspect air filter(s) at least once each month and replace  
(throwaway-type) or clean (permanent-type) at least twice dur-  
ing each cooling season or whenever the filter(s) becomes clogged  
with dust and lint.  
To ensure continuing high performance, and to reduce the pos-  
sibility of premature equipment failure, periodic main-  
tenance must be performed on this equipment. Unit should  
be inspected at least once each year by a qualified service  
person.  
II. EVAPORATOR FAN AND MOTOR  
NOTE: Motors without oilers are permanently lubricated. Do  
not attempt to lubricate these motors.  
NOTE TO EQUIPMENT OWNER: Consult your local dealer  
about the availability of a maintenance contract.  
For longer life, operating economy, and continued efficiency,  
clean accumulated dirt and grease from the evaporator-fan  
wheel and motor annually.  
WARNING: The ability to properly perform mainte-  
nance on this equipment requires certain expertise,  
mechanical skills, tools, and equipment. If you do not  
possess these, do not attempt to perform any mainte-  
nance on this equipment other than those procedures  
recommended in the Users Manual. FAILURE TO HEED  
THIS WARNING COULD RESULT IN SERIOUS PER-  
SONAL INJ URY AND POSSIBLE DAMAGE TO THIS  
EQUIPMENT.  
Lubricate the motor every 5 years if the motor is used inter-  
mittently (thermostat FAN switch in AUTO. position), or  
every 2 years if the motor is used continuously (thermostat  
FAN switch in ON position).  
WARNING: Disconnect and tag all electrical power to  
the unit before cleaning the evaporator-fan and wheel.  
Failure to adhere to this warning could cause personal  
injury or death.  
The minimum maintenance requirements for this equipment  
are as follows:  
To clean the blower wheel:  
1. Inspect air filter(s) each month. Clean or replace when  
necessary.  
1. Access the blower assembly as follows:  
a. Remove top access panel.  
2. Inspect condensing coil, drain pan, and condensate drain  
each cooling season for cleanliness. Clean when  
necessary.  
b. Remove 3 screws that hold blower orifice ring to blower  
housing. Save screws.  
c. Loosen set screw(s) which secure wheel to motor shaft.  
2. Remove and clean blower wheel as follows:  
3. Inspect evaporator-fan motor and wheel for cleanliness  
each heating and cooling season. Clean when necessary.  
For first heating season, inspect evaporator-fan motor  
bimonthly to determine proper cleaning frequency.  
a. Lift wheel from housing. When handling and/or clean-  
ing blower wheel, be sure not to disturb balance weights  
(clips) on blower wheel vanes.  
4. Check electrical connections for tightness and controls  
for proper operation each heating and cooling season.  
Service when necessary.  
b. Remove caked-on dirt from wheel and housing with  
a brush. Remove lint and/or dirt accumulations from  
wheel and housing with vacuum cleaner, using a soft  
brush attachment. Remove grease and oil with a mild  
solvent.  
5. Check the drain channel in the top cover periodically  
for blockage (leaves, insects). Clean as needed.  
c. Reassemble blower into housing. Place upper orifice  
ring on blower to judge location of the blower wheel.  
Blower wheel should be approximately .2 in. below  
bottom of orifice ring when centered correctly. Be sure  
set screws are tightened on motor and are not on round  
part of shaft.  
WARNING: Failure to follow these warnings could re-  
sult in serious personal injury:  
1. Turn off all electrical power to the unit before per-  
forming any maintenance or service on the unit.  
2. Use extreme caution when removing panels and parts.  
As with any mechanical equipment, personal injury  
can result from sharp edges, etc.  
d. Set upper orifice ring in place with 3 screws removed  
in Step 1.  
3. Never place anything combustible either on, or in con-  
tact with, the unit.  
e. Replace top access panel.  
4. Should overheating occur, shut off all of the electri-  
cal supply(s).  
—14—  
SERVICE  
Inspect the condenser coil, evaporator coil, and condensate  
drain pan at least once each year. Proper inspection and clean-  
ing requires the removal of the unit top. See Unit Top  
Removal section above.  
NOTE: The following steps should be performed by a quali-  
fied service person.  
The coils are easily cleaned when dry; therefore, inspect and  
clean the coils either before or after each cooling season.  
Remove all obstructions (including weeds and shrubs) that  
interfere with the airflow through the condenser coil. Straighten  
bent fins with a fin comb. If coated with dirt or lint, clean the  
coils with a vacuum cleaner, using a soft brush attachment.  
Be careful not to bend the fins. If coated with oil or grease,  
clean the coils with a mild detergent-and-water solution. Rinse  
coils with clear water, using a garden hose. Be careful not to  
splash water on motors, insulation, wiring, or air filter(s). For  
best results, spray condenser-coil fins from inside to outside  
the unit. On units with an outer and inner condenser coil, be  
sure to clean between the coils. Be sure to flush all dirt and  
debris from the unit base.  
WARNING: Before installing or servicing unit, turn  
off main power to system to avoid shock hazard or in-  
jury from rotating parts. There may be more than one  
disconnect switch. Turn off accessory heater power if  
applicable. Electrical shock can cause personal injury  
or death.  
I. CLEANING  
Inspect unit interior at the beginning of each heating and cool-  
ing season or as operating conditions require. To inspect and  
clean, the unit top must be removed.  
A. Unit Top Removal  
NOTE: When performing maintenance or service procedures  
that require removal of the unit top, be sure to perform all of  
the routine maintenance procedures that require top re-  
moval, including: coil inspection and cleaning, and conden-  
sate drain pan inspection and cleaning.  
Inspect the drain pan and condensate drain line when  
inspecting the coils. Clean the drain pan and condensate drain  
by removing all foreign matter from the pan. Flush the pan  
and drain tube with clear water. Do not splash water on the  
insulation, motor, wiring, or air filter(s). If the drain tube is  
restricted, clear it with a plumbers snake or similar probe  
device. Ensure that the auxiliary drain port above the drain  
tube is also clear.  
Only qualified service personnel should perform mainte-  
nance and service procedures that require unit top removal.  
Refer to the following top removal procedures:  
1. Remove 7 screws on unit top cover surface. Save all screws.  
2. Remove 2 screws that secure unit top cover flange. Save  
all screws.  
II. EVAPORATOR FAN AND MOTOR  
Refer to Care and Maintenance section for procedure.  
3. Lift top from unit carefully. Set top on edge and ensure  
that top is supported by unit side that is opposite duct  
side.  
III. CONDENSER FAN  
When maintenance and/or service procedures are concluded,  
carefully replace and secure unit top to unit, using screws re-  
moved in Steps 1 and 2.  
CAUTION: Keep the condenser fan free from all  
obstructions to ensure proper cooling operation. Never  
place articles on top of the unit. Damage to unit may  
result.  
B. Repairing Refrigerant Leaks  
Proceed as follows to repair a refrigerant leak and to charge  
the unit.  
1. Shut off unit power supply.  
1. Locate leak and ensure that refrigerant system pres-  
sure has been relieved and recovered from both high-  
and low-pressure ports.  
2. Remove condenser-fan assembly (grille, motor, motor cover,  
and fan) by removing screws and flipping assembly onto  
unit top cover.  
2. Repair leak following accepted practices.  
3. Loosen fan hub setscrews.  
4. Adjust fan height as shown in Fig. 18.  
5. Tighten setscrews.  
NOTE: Install a filter drier whenever the system has been  
opened for repair.  
3. Add a small charge of nitrogen vapor to system and leak-  
test unit.  
6. Replace condenser-fan assembly.  
4. Evacuate refrigerant system if additional leaks are not  
found.  
5. Charge unit with R-22 refrigerant, using a volumetric-  
charging cylinder or accurate scale. Refer to unit rating  
plate for required charge. Be sure to add extra refrig-  
erant to compensate for internal volume of filter drier.  
NOTE: See Adjusting Refrigerant Charge on page 16.  
C. Condenser Coil, Evaporator Coil, and Condensate  
Drain Pan  
Fig. 18 — Condenser-Fan Adjustment  
WARNING: Be careful! Coil fins are sharp. Protect  
hands with gloves when cleaning or handling coil.  
—15—  
IV. ELECTRICAL CONTROLS AND WIRING  
A. Adjusting Refrigerant Charge  
Inspect and check the electrical controls and wiring an-  
nually. Be sure to turn off all electrical power to the unit.  
Amount of refrigerant charge is listed on unit nameplate (also  
refer to Table 1). Refer to Carrier Refrigerant Service Tech-  
niques Manual, Refrigerants section.  
Remove the control, evaporator fan, and compressor compart-  
ment access panels to locate all the electrical controls and  
wiring. Check all electrical connections for tightness. Tighten  
all screw connections. If any smoky or burned connections are  
noticed, disassemble the connection and clean all the parts.  
Then restrip the wire end, and reassemble the connection prop-  
erly and securely.  
Unit panels must be in place when unit is operating during  
charging procedure.  
No Charge  
Use standard evacuating techniques. After evacuating  
system, weigh in the specified amount of refrigerant (refer to  
Table 1).  
After inspecting the electrical controls and wiring, replace all  
the panels. Start the unit, and observe at least one complete  
heating cycle (if accessory electric heaters are field installed  
in unit) and one complete cooling cycle to ensure proper  
operation. If discrepancies are observed in either or both  
operating cycles, or if a suspected malfunction has occurred,  
check each electrical component with the proper electrical  
instrumentation. Refer to unit wiring label when performing  
these checkouts.  
Low Charge Cooling  
Use Cooling Charging Charts, Fig. 19-24. Vary refrigerant un-  
til the conditions of the appropriate chart are met. Note that  
charging charts are different from the type normally used.  
Charts are based on charging the units to the correct super-  
heat for the various operating conditions. Accurate pressure  
gage and temperature sensing device are required.  
NOTE: Refer to the Cooling Sequence of Operation on  
page 13 as an aid in determining proper control operation.  
To measure suction pressure, perform the following:  
V. INDOOR AIRFLOW  
1. Connect the pressure gage to the service port on the suc-  
tion line.  
The airflow does not require checking unless improper per-  
formance is suspected. If a problem exists, be sure that all  
supply- and return-air grilles are open and free from obstruc-  
tions, and that the air filter is clean. When necessary, refer  
to Indoor Airflow and Airflow Adjustments section on  
page 13 to check the system airflow.  
2. Mount the temperature sensing device on the suction  
line and insulate it so that outdoor ambient tempera-  
ture does not affect the reading. Indoor-air cfm must be  
within the normal operating range of the unit.  
To Use Cooling Charging Charts  
VI. METERING DEVICE SERVICING  
1. Take the outdoor ambient temperature and read the suc-  
tion pressure gage.  
Refrigerant metering devices are fixed orifices and are lo-  
cated in the inlet header to the evaporator coil.  
2. Refer to appropriate chart to determine what the suc-  
tion temperature should be.  
VII. LIQUID LINE STRAINER  
Strainer is made of wire mesh and is located in the liquid  
line on inlet side. Remove strainer by cutting it from the liq-  
uid line. Braze a new strainer into liquid line with nitrogen  
gas flowing through the refrigerant system.  
3. If suction temperature is high, add refrigerant. If suc-  
tion temperature is low, carefully recover some of the  
charge.  
4. Recheck the suction pressure as charge is adjusted.  
VIII. REFRIGERANT CHARGE  
EXAMPLE: (Fig. 19)  
Outdoor Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F  
Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 psig  
WARNING: Avoid contact with hot gas discharge line  
to prevent a burn when working on compressor.  
Suction Temperature should be . . . . . . . . . . . . . . . . . . . 70 F  
(Suction Temperature may vary ± 5° F.)  
CAUTION: To prevent personal injury, wear safety  
glasses and gloves when handling refrigerant.  
If Chargemastercharging device is used, temperature and  
pressure readings must be accomplished using the charging  
chart.  
Do not overcharge system. An overcharge can cause com-  
pressor damage.  
IX. REPLACEMENT PARTS  
Unit refrigerant system is factory charged. When recharging  
is necessary, weigh in total charge indicated on unit name-  
plate. Remove and recover any refrigerant remaining in  
system before recharging. If system has lost complete charge,  
evacuate system to 500 microns (29.90-in. Hg vacuum) be-  
fore recharging. Schrader fitting connections are provided on  
unit suction and discharge lines for evacuation and charg-  
ing. Dial-a-Charge charging cylinder is an accurate device used  
to charge systems by weight; these cylinders are available at  
refrigeration supply firms.  
A complete list of replacement parts may be obtained from  
your distributor upon request.  
—16—  
Fig. 19 — Cooling Charging Chart — 564A/764A024  
Fig. 21 — Cooling Charging Chart — 564A/764A036  
Fig. 20 — Cooling Charging Chart 564A/764A030  
Fig. 22 — Cooling Charging Chart — 564A/764A042  
—17—  
Fig. 24 — Cooling Charging Chart — 564A/764A060  
Fig. 23 — Cooling Charging Chart — 564A/764A048  
—18—  
COOLING TROUBLESHOOTING CHART  
CAUSE  
SYMPTOM  
REMEDY  
Compressor and con-  
denser fan will not  
start.  
Power failure  
Call power company.  
Fuse blown or circuit breaker tripped  
Replace fuse or reset circuit breaker.  
Replace component.  
Defective thermostat, contactor, transformer,  
or control relay  
Insufficient line voltage  
Incorrect or faulty wiring  
Thermostat setting too high  
Determine cause and correct.  
Check wiring diagram and rewire correctly.  
Lower thermostat setting below room temperature.  
Check wiring and repair or replace.  
Compressor will not  
start but condenser  
fan runs.  
Faulty wiring or loose connections in  
compressor circuit  
Compressor motor burned out, seized, or  
internal overload open  
Determine cause. Replace compressor.  
Determine cause and replace.  
Defective run/start capacitor, overload, or  
start relay  
One leg of 3-phase power dead  
Replace fuse or reset circuit breaker.  
Determine cause.  
Compressor cycles  
(other than normally  
satisfying thermostat).  
Refrigerant overcharge or undercharge  
Recover refrigerant, evacuate system, and recharge  
to capacities shown on nameplate.  
Defective compressor  
Insufficient line voltage  
Blocked condenser  
Replace and determine cause.  
Determine cause and correct.  
Determine cause and correct.  
Determine cause and replace.  
Defective run/start capacitor, overload,  
or start relay  
Defective thermostat  
Replace thermostat.  
Faulty condenser-fan motor or capacitor  
Restriction in refrigerant system  
Dirty air filter  
Replace.  
Locate restriction and remove.  
Replace filter.  
Compressor operates  
continuously.  
Unit undersized for load  
Thermostat set too low  
Low refrigerant charge  
Leaking valves in compressor  
Air in system  
Decrease load or increase unit size.  
Reset thermostat.  
Locate leak, repair, and recharge.  
Replace compressor.  
Recover refrigerant, evacuate system, and recharge.  
Clean coil or remove restriction.  
Replace filter.  
Condenser coil dirty or restricted  
Dirty air filter  
Excessive head  
pressure.  
Dirty condenser coil  
Clean coil.  
Refrigerant overcharged  
Air in system  
Recover excess refrigerant.  
Recover refrigerant, evacuate system, and recharge.  
Determine cause and correct.  
Check for leaks, repair and recharge.  
Replace compressor.  
Condenser air restricted or air short-cycling  
Low refrigerant charge  
Compressor valves leaking  
Restriction in liquid tube  
High heat load  
Head pressure too low.  
Remove restriction.  
Excessive suction  
pressure.  
Check for source and eliminate.  
Replace compressor.  
Compressor valves leaking  
Refrigerant overcharged  
Dirty air filter  
Recover excess refrigerant.  
Replace filter.  
Suction pressure too  
low.  
Low refrigerant charge  
Metering device or low side restricted  
Insufficient evaporator airflow  
Check for leaks, repair, and recharge.  
Remove source of restriction.  
Increase air quantity. Check filter, and replace if  
necessary.  
Temperature too low in conditioned area  
Outdoor ambient below 40 F  
Reset thermostat.  
Install low-ambient kit.  
Replace.  
Field-installed filter-drier restricted  
—19—  
PACKAGED SERVICE TRAINING  
Our packaged service training programs provide an excellent way to increase your knowledge of the  
equipment discussed in this manual. Product programs cover:  
Maintenance  
Operating Sequence  
Unit Familiarization  
Installation Overview  
A large selection of product, theory, and skills programs is available. All programs include a video  
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training  
sessions.  
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are  
included.  
Copyright 1996 Carrier Corporation  
CATALOG NO. BDP-3356-403  
START-UP CHECKLIST  
(Remove and Store in Job File)  
I. PRELIMINARY INFORMATION  
MODEL NO.:  
DATE:  
SERIAL NO.:  
TECHNICIAN:  
II. PRE-START-UP (insert checkmark in box as each item is completed)  
VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT  
VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS  
CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS  
VERIFY THAT UNIT INSTALLATION IS LEVEL  
CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW  
TIGHTNESS  
III. START-UP  
ELECTRICAL  
SUPPLY VOLTAGE  
L1-L2  
L2-L3  
L2  
L3-L1  
L3  
COMPRESSOR AMPS L1  
EVAPORATOR-FAN AMPS  
TEMPERATURES  
OUTDOOR-AIR TEMPERATURE  
RETURN-AIR TEMPERATURE  
DB  
DB  
WB  
PRESSURES  
REFRIGERANT SUCTION  
REFRIGERANT DISCHARGE  
PSIG  
PSIG  
VERIFY REFRIGERANT CHARGE USING CHARGING TABLES  
Copyright 1996 Carrier Corporation  
CL-1  
CATALOG NO. BDP-3356-403  

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