4
Power Return Axial Flow Fans (16-25 and 30 tons) ................................................................ 73
Power Return and Exhaust Axial Flow Fans (26 and 31-140 tons) .......................................... 75
Filters ........................................................................................................................................ 76
Adjusting Refrigerant Charge ................................................................................................... 76
Checking Liquid Sub-Cooling .............................................................................................. 77
Checking Evaporator Superheat ........................................................................................... 77
Adjusting Sub-cooling and Superheat Temperatures............................................................ 78
Gas Heater Instructions ............................................................................................................. 80
Condenser Fan Electronically Commutated Motor (ECM) Startup ......................................... 81
VFD Controlled Condenser Fan Startup ................................................................................... 82
Operation....................................................................................................................................... 83
Thermostat Operation ............................................................................................................... 83
Packaged DX Cooling Operation and Control ......................................................................... 83
Gas Heater Operation ................................................................................................................ 83
Electric Heating Operation ....................................................................................................... 84
Steam or Hot Water Preheating and Heating Operation ........................................................... 84
Modulating Electric Preheat ..................................................................................................... 84
Chilled Water or Non-Compressorized DX Cooling Operation ............................................... 84
Maintenance .................................................................................................................................. 85
Gas Heating ............................................................................................................................... 85
Gas Heat Exchanger Removal .................................................................................................. 86
DX Cooling ............................................................................................................................... 86
Condenser Fans (6-25 and 30 ton) ............................................................................................ 86
Condensate Drain Pans ............................................................................................................. 87
Evaporator Coil (6-25 and 30 ton) ............................................................................................ 88
Brazed Plate Heat Exchanger Cleaning .................................................................................... 88
E-Coated Coil Cleaning ............................................................................................................ 89
Microchannel Coil Cleaning ..................................................................................................... 90
Supply Fans ............................................................................................................................... 91
Phase and Brownout Protection ................................................................................................ 92
Variable Capacity Compressor Controller ................................................................................ 93
Filter Replacement .................................................................................................................... 94
Replacement Parts ................................................................................................................... 102
Appendix A - Heat Exchanger Corrosion Resistance ................................................................. 103
Appendix B - Thermistor Temperature vs. Resistance Values ................................................... 105
RN Series Startup Form .............................................................................................................. 106
Maintenance Log ........................................................................................................................ 110
Literature Change History........................................................................................................... 111
R90721 · Rev. B · 140725
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