CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Step 1 Ð Complete Pre-Installation
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Step 2 Ð Rig and Mount the Unit . . . . . . . . . . . . . 8
Step 3 Ð Complete Refrigerant Piping
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 Ð Install Accessories . . . . . . . . . . . . . . . . 10
Step 5 Ð Complete Electrical
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Leak Test and Dehydration . . . . . . . . . . . . . . . . . . 12
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . 12
Preliminary Charge . . . . . . . . . . . . . . . . . . . . . . . . . . 12
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-16
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preliminary Oil Charge . . . . . . . . . . . . . . . . . . . . . . 13
Start Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Adjust Refrigerant Charge . . . . . . . . . . . . . . . . . . . 13
Check Compressor Oil Level . . . . . . . . . . . . . . . . 13
Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATING SEQUENCE . . . . . . . . . . . . . . . . . . . . 17
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fan Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Winter Start Control . . . . . . . . . . . . . . . . . . . . . . . . . 17
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-19
Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Head Pressure Control . . . . . . . . . . . . . . . . . . . . . . 17
Time Guard II Circuit . . . . . . . . . . . . . . . . . . . . . . . 17
Winter Start Control . . . . . . . . . . . . . . . . . . . . . . . . . 18
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . 18
High-Pressure Switches . . . . . . . . . . . . . . . . . . . . . 18
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . 18
Outdoor Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Cleaning Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 20,21
START-UP CHECKLIST . . . . . . . . . . . . . . . . CL-1,CL-2
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, quali®ed 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 ®re extinguisher nearby when braz- ing. Use care in handling, rigging, and setting bulky equip- ment.
ELECTRIC SHOCK HAZARD
Separate power sources (main and control power circuits) are used for these units. Be sure both main and control power circuits are disconnected before servicing.
INSTALLATION
Step 1 Ð Complete Pre-Installation Checks
UNCRATE UNIT Ð Remove unit packaging except for the top skid assembly, which should be left in place until after the unit is rigged into its ®nal location.
INSPECT SHIPMENT Ð File claim with shipping com- pany if shipment is damaged or incomplete.
CONSIDER SYSTEM REQUIREMENTS
·Consult local building codes and National Electrical Code (NEC, U.S.A.) for special installation requirements.
·Allow sufficient space for air¯ow clearance, wiring, refrigerant piping, and servicing unit. See Fig. 1. See Fig. 2 for unit component locations.
·Locate unit so that outdoor coil (condenser) air¯ow is un- restricted on all sides and above.
·Unit may be mounted on a level pad directly on the base channels or mounted on raised pads at support points. See Tables 1A-1D for unit operating weights. See Table 2 for weight distribution based on recommended sup- port points.
NOTE: If vibration isolators are required for a particular installation, use the data in Table 2 to make the proper selection.
