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Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ...................1
BEFORE INSTALLATION .....................1-3
Rigging ......................................1
Placing Unit .................................3
Mounting Unit ...............................3
Compressor Mounting ........................3
INSTALLATION .............................3-12
Refrigerant Piping Connections ...............3
Liquid Line Solenoid Drop Control ............3
Filter Drier and Moisture Indicator ............3
Receiver .....................................4
Piping Procedure ............................4
Power Supply ................................6
Power Wiring ................................6
START-UP ................................13-17
Initial Check ................................13
Leak Test and Dehydration ..................13
Preliminary Charge ..........................13
Start Unit ...................................13
Charge System .............................13
Operation ...................................13
Control Module (CM) ........................13
Bypass Relay (BPR) .........................17
Time-Delay Relay (TDR) .....................17
Sequence of Operation ......................17
Complete Unit Stoppage .....................17
SERVICE ..................................17-20
Access for Servicing ........................17
Fan Adjustment .............................19
Oil Charge ..................................19
Liquid Shutoff/Charging Valve ...............19
Capacity Control ............................19
Oil Pressure Safety Switch (OPS) ............20
Compressor Protection ......................20
High-Pressure Switch .......................20
Low-Pressure Switch ........................20
Winter Start Control .........................20
Head Pressure Control ......................20
TROUBLESHOOTING ........................21
START-UP CHECKLIST .....................CL-1
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equip-
ment can be hazardous due to system pressures, electrical
components, and equipment location (roofs, elevated struc-
tures, etc.).
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment (Fig. 1).
Untrained personnel can perform basic maintenance func-
tions such as cleaning coils. All other operations should be
performed by trained service personnel.
When working on the equipment, observe precautions in
the literature and on tags, stickers, and labels attached to the
equipment.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Keep, quenching cloth and fire extinguisher nearby when
brazing.
• Use care in handling, rigging, and setting bulky
equipment.
• See Table 1A or 1B for physical data.
ELECTRIC SHOCK HAZARD
Open all remote disconnects before
servicing this equipment.
BEFORE INSTALLATION
Rigging —
Preferred method is with spreader bars from
above the unit. Use 2-in. (50 mm) OD pipe or hooks in lift-
ing holes. Rig with 4 cables and spreader bars. All panels
must be in place when rigging. See rigging label on unit for
details concerning shipping weights, distance between lift-
ing holes, center of gravity, and spreader bar dimensions.
See Fig. 2.
If overhead rigging is not possible, place unit on skid or
pad for rolling or dragging. When rolling, use minimum of
3 rollers. When dragging, pull the pad. Do not apply force
to the unit. When in final position, raise from above to lift
unit off pad.
All panels must be in place when rigging.
38AKS028-044
Air-Cooled Condensing Units
50/60 Hz
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
Tab 3a
PC 111 Catalog No. 533-820 Printed in U.S.A. Form 38A-5SI Pg 1 7-94 Replaces: 38AK-3SI