Installation, Start-Up
and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS .................... 2
INSTALLATION GUIDELINES .................. 3
INSTALLATION ........................... 7- 16
Step 1 - Plan for Unit Location .................. 7
Step 2 - Complete Pre-Installation Checks ......... 8
Step 3 - Prepare Unit Mounting Support ........... 8
Step 4 - Rig and Mount the Unit ................. 8
Step 5 - Complete Refrigerant Piping Connections... 8
Step 6 - Install Accessories .................... 12
Step 7 - Complete Electrical Connections ......... 12
PRE-START-UP ............................... 17
System Checks .............................. 17
Turn On Crankcase Heaters .................... 17
Preliminary Charge ........................... 17
START-UP .............................. 17 - 20
38AUQ Units ............................... 17
OPERATING SEQUENCE ...................... 21
Indoor (Supply) Fan .......................... 21
Cooling Unit Without Economizer ............... 21
Cooling Unit With Economizer ................. 21
Defrost Cycle ............................... 21
Supplemental Heating/Emergency Heating ........ 22
Cooling and Heating Shutdown ................. 22
ROUTINE SYSTEM MAINTENANCE ............ 22
Quarterly Inspection
(and 30 days after initial start) .................. 22
SERVICE ................................ 23 - 35
Refrigeration System ......................... 23
Compressor Oil .............................. 23
Servicing Systems on Roofs
with Synthetic Materials ....................... 23
Liquid Line Filter Driers ....................... 23
Filed Refrigerant Access Ports .................. 23
Outdoor Coil Metering Devices ................. 23
Refrigerant System Pressure Access Ports ......... 24
Compressor Protection ........................ 24
Crankcase Heater ............................ 24
Commercial Defrost Board ..................... 24
Comfort Alert Diagnostic Module ............... 31
Lubrication ................................. 33
Outdoor Coil Maintenance and
Cleaning Recommendations .................... 33
Service Parts ................................ 35
Fastener Torque Values ........................ 35
TROUBLESHOOTING ......................... 36
APPENDIX A
Air Conditioner and Heat Pump with Puron _n_-
Quick Reference Guide ........................ 37
APPENDIX B
Wiring Diagram List .......................... 37
APPENDIX C
Low Ambient Option -- Factory Installed ......... 38
START-UP CHECKLIST ................... 43 - 44
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