Bryant 575A User Manual
installation, start-up
and service instructions
COMMERCIAL AIR-COOLED
SPLIT SYSTEM HEAT PUMP
Cancels: II 575A-90-1 II 575A-90-2
575A
Size 090
71⁄2Tons
12/1/95
IMPORTANT — READ BEFORE INSTALLING
1. Read and become familiar with these installation instructions before installing this unit.
2. Be sure the installation conforms to all applicable local
and national codes.
3. These instructionscontainimportant information for the
proper maintenance and repair of this equipment. Retain these instructions for future use.
CONTENTS
Page
SAFETY CONSIDERATIONS .......................1
INSTALLATION .................................1-8
I. Complete Pre-Installation Checks ............1
II. Rig and Mount the Unit .....................3
III. Complete Refrigerant Piping Connections .....4
IV. Make Electrical Connections ................6
START-UP ....................................8-11
I. Preliminary Checks ........................8
II. Evacuate and Dehydrate ....................8
III. Refrigerant and Oil Charge ..................8
IV. Refrigerant Service Ports ...................9
V. Sequence of Operation .....................9
VI. Checking Cooling and Heating Control
Operation ...............................10
VII. Malfunction ..............................10
SERVICE ....................................11,12
I. Cleaning ................................11
II. Lubrication ..............................12
III. Outdoor Fan Adjustment ...................12
IV. Compressor Removal .....................12
TROUBLESHOOTING CHART ...................13,14
START-UP CHECKLIST .....................CL-1,CL-2
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install or service air-conditioning equipment.
When working on air-conditioning equipment, observe precautions in literature and on tags and labels attached to unit.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly. Consult local building codes and National Electrical Code (NEC)
for special installation requirements.
The 575A090 outdoor unit is approved for use only with the
524A-H090 indoor unit. Use only approved indoor unit.
The 575A090 unit is Underwriters’Laboratories (UL) and UL
Canada approved for use with the 524A-H090 indoor unit only.
I. COMPLETE PREINSTALLATION CHECKS
A. Uncrate Unit (See Fig. 1)
Remove unit packaging except for the top skid assembly and
wood bumpers, which should be left in place until after unit
is rigged into place.
B. Inspect Shipment
File claim with shipping company if shipment is damaged or
incomplete.
C. Consider System Requirements
• Consult local building codes and NEC for special installation requirements.
• Allow sufficient space for airflow clearance, wiring, refrigerant piping, and servicing unit. See Fig. 2.
• Locate unit so that outdoor unit airflow is unrestricted on
all sides and above. Refer to Fig. 2.
• Unit may be mounted on a level pad directly on base rails
or mounted on raised pads at support points. See Fig. 2 for
weight distribution based on recommended support points.
• Provide for condensate drainage and defrost water disposal beneath unit.
• Areas with high snowfall may need elevated mounting for
adequate airflow.
NOTE: If vibration isolators are required for a particular installation, use corner weight information in Fig. 2 to make
proper selection.
WARNING:
ways turn off main power to system. There may be more
than one disconnect switch. Electrical shock can cause
personal injury.
The 575A090 unit uses a semi-hermetic compressor. See
Table 1 for physical data.
Before installing or servicing system, al-
INSTALLATION
Fig. 1 — 575A090 Unit
UNIT
575A
UNIT W/
ALUMINUM-FIN
COIL
UNIT W/
COPPER-FIN
COIL
WEIGHT (WITH ALUMINUM-FIN COIL) WEIGHT (WITH COPPER-FIN COIL)
Std Unit Corner W Corner X Corner Y Corner Z Std Unit Corner W Corner X Corner Y Corner Z
Dim. A Dim. B Dim. A Dim. B Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg
1
⁄
2
9
18-43⁄
4
090
18-89
[508.0]
18-59
[431.8]
18-9
[546.0]
9
540 245 132 60 100 45 133 60 175 80 608 276 160 73 117 53 142 64 189 86
[425]
NOTES:
1. Dimensions in [ ] are in millimeters.
2. Center of Gravity. See chart for dimensions.
3. Direction of airflow.
4. Minimum clearance (local codes or jurisdiction may prevail):
a. Bottom to combustible surfaces, 0 in. (0 mm)
b. Outdoor coil, for proper airflow, 36 in. (914 mm) one side, 12 in.
(305 mm) the other. The side getting the greater clearance is optional.
c. Overhead, 60 in. (1524 mm) to assure proper outdoor-fan operation.
d. Between units, control box side, 42 in. (1067 mm) per National
Electrical Code (NEC).
e. Between unit and ungrounded surfaces, control box side, 36 in.
(914 mm) per NEC.
f. Between unit and block or concrete walls and other grounded surfaces,
control box side, 42 in. (1067 mm) per NEC.
5. With the exception of the clearance for the outdoor coil as stated in
note 4b, a removable fence or barricade requires no clearance.
6. Units may be installed on combustible floors made from wood or Class A,
B, or C roof covering material.
7. Vertical center of gravity is approximately 40% of total unit height.
Fig. 2 — Dimensions
—2—
ELECTRICAL CONNECTIONS
CONNECTION SIZES
3
AA 1
⁄89 Dia. [35] Field Power Supply Hole
BB 29 Dia. [51] Power Supply Knockout
1
CC 2
DD
⁄29 Dia. [64] Power Supply Knockout
7
⁄89 Dia. [22] Field Control Wiring Hole
SERVICE VALVE CONNECTIONS
UNIT SUCTION LIQUID
575A090 1
1
⁄89 [28.6]
1
⁄29 [12.7]
Table 1 — Physical Data
UNIT 575A 090
OPERATING WEIGHT (lb)
Aluminum Coils (Standard) 540
Copper Coils (Optional) 608
RIGGING WEIGHT (lb)
Aluminum Coils (Standard) 590
Copper Coils (Optional) 658
REFRIGERANT* R-22
COMPRESSOR Reciprocating, Semi-Hermetic
Quantity...Type 1...06DA818
Quantity Cylinders 4
Speed (rpm) 1750
Oil Charge (oz) (ea) 88
OUTDOOR FAN Propeller; Direct Drive
Quantity...rpm 1...1100
Diameter (in.) 26
Motor Hp (NEMA)
Nominal Airflow (cfm) 6500
OUTDOOR COIL Enhanced Copper Tubes,
Face Area (sq ft) 18.0
Storage Capacity (lb)† 16.56
Fins/in. 17.0
Rows (No.) 2
CONNECTIONS (Sweat)
Suction (in.) 1
Liquid (in.)
CONTROLS
Pressurestat Settings (psig)
High Cutout 426 6 7
Cut-in 320 6 20
Low Cutout 7 6 3
Cut-in 22 6 5
Defrost Thermostat
Initiate Defrost (F) 28
Terminates Defrost (F) 65
LEGEND
NEMA — National Electrical Manufacturing Association
*Unit is factory supplied with holding charge only.
†Storage capacity of coil with coil 80% full of liquid R-22 at 120 F.
Aluminum Lanced Fins
3
⁄
4
1
⁄
8
1
⁄
2
II. RIG AND MOUNT THE UNIT
CAUTION:
Be sure unit panels are securely in place
prior to rigging.
B. Mounting
The unit must be elevated to ensure drainage from basepan
during sub-freezing conditions and to prevent or limit blockage of outdoor coil during snowfall. Consideration should be
given to specific geographical areas when determining height
of unit elevation.
C. Compressor Mounting
As shipped, compressors are held down by 4 bolts.After unit
is installed, loosen each bolt until the snubber washer can be
moved with finger pressure. See Fig. 4.
MAX WEIGHT
UNIT
575A090 590 268 658 298 45.0 1143 38.5 989 43.5 1105
Al — Aluminum-Fin
Cu — Copper-Fin
w/Al
Coil
Lb Kg Lb Kg in. mm in. mm in. mm
w/Cu
Coil
ABC
Fig. 3 — Rigging Label
A. Rigging
The unit is designed for overhead rigging. Refer to rigging
label for preferred rigging method. Spreader bars are not required if top crating is left on unit. All panels must be in place
when rigging. (See Fig. 3.) As further protection for coil faces,
plywood sheets may be placed against sides of unit, behind
cables. Run cables to a central suspension point so that angle
from the horizontal plane is not less than 45 degrees. Raise
and set unit down carefully.
If it is necessary to roll unit into position, mount unit on rails,
using a minimum of 3 rollers. Apply forceto rails, not unit. If
unit is to be skidded into position, place it on a large pad and
drag it by the pad. Do not apply any force to unit.
Raise from above to lift unit from rails or pad when unit is in
final position.
After unit is in position, remove all shipping wrapping and
top crating.
Fig. 4 — Compressor Mounting
—3—
III. COMPLETE REFRIGERANT PIPING CONNECTIONS
Suction connection is sweat with plastic cap; liquid connection is sweat with plastic cap. Refer to Table 2 for the proper
line sizes. Follow standard piping practices.
Table 2 — Refrigerant Piping Sizes
LINEAR LENGTH OF PIPING — ft
UNIT
575A
090
L—Liquid Line OD — Outside Diameter S—Suction Line
NOTES:
1. Pipe sizes are based on a 2° F loss for liquid and suction lines.
2. Pipe sizes are based on the maximum linear length shown for each
column, plus a 50% allowance for fittings.
3. Charge units with R-22 in accordance with unit installation
instructions.
0-25 25-50 50-75 75-100
Line Size (in. OD)
LSLSLSLS
1
⁄
2
11⁄
5
8
⁄
8
LEGEND
11⁄
5
8
⁄
8
13⁄
3
8
⁄
4
13⁄
8
A. Size Refrigerant Lines
Consider length of piping required between 575A unit and
524A-H unit, amount of liquid lift, and compressor oil return. See Table 3. Refer to 524A installation instructions for
additional information.
Table 3 — Liquid Line Data
UNIT
575A
090
LEGEND
db — Dry Bulb
wb — Wet Bulb
NOTES:
1. The liquid lift in cooling mode is based on 80/67 F (db/wb ) entering
indoor-air temperature and a 95 F outdoor-air temperature, with R-22
refrigerant, at an indoor airflow of 3000 cfm.
2. The liquid lift in heating mode is based on 70/60 F (db/wb) entering
indoor-air temperature and a 47/43 F (db/wb) outdoor-air temperature, with R-22 refrigerant, at an indoor airflow of 3000 cfm.
MAX
ALLOWABLE
LIQUID LIFT (ft)
Heating Cooling
75 65 7 2
Max Allowable
Pressure Drop
LIQUID LINE
Max Allowable
(psi)
Temp Loss
(F)
B. Filter Drier and Moisture Indicator
See Fig. 5. The filter drier is factory supplied and fieldinstalled in the liquid line. Moisture indicator is fieldsupplied and should be installed just after liquid line shutoff
valve. Do not use a receiver; there is none provided with unit
and one should not be used.
NOTE: Unit is shipped with R-22 holding charge. System pressure must be relieved before removing caps. Recover refrigerant prior to brazing.
Pass nitrogen or other inert gas through piping while brazing to prevent formation of copper oxide.
C. Liquid Line Solenoid Valve
A field-supplied liquid line solenoid valve (LLSV) is recommended when piping system length exceeds 75 feet. The LLSV
must be of the biflow type, suited for use in heat pump
systems.
NOTE: Part number EF23JS214 (Sporlan model CB14S2,
5
⁄8-in. ODF/7⁄8-in. ODM) is recommended and is available from
the Replacement Components Division. This solenoid requires field-supplied Sporlan MKC-2 coils.
Wire the solenoid in parallel with the compressor contactor
coil.
Install the LLSV near the outdoor unit. The flow arrowmust
be pointed toward the outdoor unit.
D. Safety Relief
Afusible plug is located on top of the accumulator.See Fig. 6.
Note that all safety relief components are factory installed.
Do not cap fusible plug. If local code requires additional
safety device(s), install as directed.
E. Suction Piping at Indoor Coil and TXV Sensing Bulb
Location
Suction piping must be designed so that refrigerant is thoroughly mixed after it leaves the indoor coil suction header.
The thermostatic expansion valve (TXV) sensing bulb must
also be correctly located. This ensures that the TXV sensing
bulb receives reliable readings. Install the suction piping as
follows:
1. Install a minimum of two 90-degree elbows upstream of
the TXV bulb location.
2. Locate the TXV bulb on a vertical riser where possible.
If a horizontal location is necessary, secure the bulb at
approximately the 4 o’clock position or the 8 o’clock position. See Fig. 7.
3. Make sure that the piping system has no inherent oil
traps, and that the piping layout does not allow oil to
migrate into an idle indoor coil.
4. Complete refrigerant piping from indoor coil to outdoor
coil before opening liquid and suction lines at the 575A
unit. See Tables 1 and 2 for piping selection data.
—4—
LEGEND
NEC — National Electrical Code
TXV — Thermostatic Expansion Valve
*Accessory item.
†Field supplied.
NOTES:
1. All piping must follow standard refrigerant piping techniques.
2. All wiring must comply with the applicable local and national codes.
3. Wiring and piping shown are general points-of-connection guides
only and are not intended for, or to include all details for, a specific installation.
4. Liquid line solenoid valve (solenoid drop control) is recommended to prevent refrigerant migration to the compressor. A biflow type solenoid valve is required.
5. Filter drier must be of the biflow type, suitable for heat pump duty.
6. Internal factory-supplied TXV and bypass check valve not shown.
Fig.5—Typical Piping Diagram, 575A/524A-H
—5—
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