CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1 INSTALLATION GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . 2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14 Step 1 – Plan for Unit Location . . . . . . . . . . . . . . . . . . . 7 Step 2 – Complete Pre-Installation Checks. . . . . . . . . . 7 Step 3 – Prepare Unit Mounting Support . . . . . . . . . . 7 Step 4 – Rig and Mount the Unit . . . . . . . . . . . . . . . . . . 7 Step 5 – Complete Refrigerant Piping Connections . . . 7 Step 6 – Install Accessories. . . . . . . . . . . . . . . . . . . . . . 10 Step 7 – Complete Electrical Connections . . . . . . . . . 10 PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . 15 Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 -18 38AUQ Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 OPERATING SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . . . 19 Indoor (Supply) Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Cooling Unit Without Economizer. . . . . . . . . . . . . . . . . 19 Cooling, Unit With Economizer . . . . . . . . . . . . . . . . . . . 19 Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Supplemental Heating/Emergency Heating . . . . . . . . 19 Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Cooling and Heating Shutdown. . . . . . . . . . . . . . . . . 19 ROUTINE SYSTEM MAINTENANCE. . . . . . . . . . . . . . . 20 Quarterly Inspection (and 30 days after initial start) . . 20 SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 - 31 Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . 20 Compressor Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Servicing Systems on Roofs with
Synthetic Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 21 Filed Refrigerant Access Ports . . . . . . . . . . . . . . . . . 21 Outdoor Coil Metering Devices. . . . . . . . . . . . . . . . . 21 Refrigerant System Pressure Access Ports . . . . . . . . 21 Heat Pump Controls. . . . . . . . . . . . . . . . . . . . . . . . . . 22 Commercial Defrost Board . . . . . . . . . . . . . . . . . . . . . . 22 Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Compressor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . 22 Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . 33
Comfort Alert Diagnostic Module . . . . . . . . . . . . . . 28 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Outdoor Coil Maintenance and Cleaning Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Fastener Torque Values . . . . . . . . . . . . . . . . . . . . . . . 31 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
APPENDIX A
Air Conditioner and Heat Pump with Puron® –
Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . 33
APPENDIX B
Wiring Diagram List. . . . . . . . . . . . . . . . . . . . . . . . . 33
APPENDIX C
Motormaster Sensor Locations. . . . . . . . . . . . . . . . . 34 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . .CL-1, CL-2
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions package
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloths for brazing operations and have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local building codes and appropriate national electrical codes (in USA, ANSI/NFPA70, National Electrical Code (NEC); in Canada, CSA C22.1) for special requirements.
It is important to recognize safety information. This is the safety-alert symbol 
. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety- alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
