4
Checking Liquid Sub-Cooling .............................................................................................. 76
Checking Evaporator Superheat............................................................................................ 76
Adjusting Sub-cooling and Superheat Temperatures............................................................ 77
Gas Heater Instructions ............................................................................................................. 79
Condenser Fan Electronically Commutated Motor (ECM) Startup ......................................... 80
VFD Controlled Condenser Fan Startup ................................................................................... 81
Operation....................................................................................................................................... 82
Thermostat Operation ............................................................................................................... 82
Packaged DX Cooling Operation and Control ......................................................................... 82
Gas Heater Operation ................................................................................................................ 82
Electric Heating Operation ....................................................................................................... 83
Steam or Hot Water Preheating and Heating Operation ........................................................... 83
Modulating Electric Preheat ..................................................................................................... 83
Chilled Water or Non-Compressorized DX Cooling Operation ............................................... 83
Maintenance .................................................................................................................................. 84
Gas Heating ............................................................................................................................... 84
Gas Heat Exchanger Removal .................................................................................................. 85
DX Cooling ............................................................................................................................... 85
Condenser Fans (6-25 and 30 ton) ............................................................................................ 86
Condensate Drain Pans ............................................................................................................. 86
Evaporator Coil (6-25 and 30 ton) ............................................................................................ 87
Brazed Plate Heat Exchanger Cleaning .................................................................................... 87
E-Coated Coil Cleaning ............................................................................................................ 88
Microchannel Coil Cleaning ..................................................................................................... 89
Supply Fans ............................................................................................................................... 90
Phase and Brownout Protection ................................................................................................ 91
Variable Capacity Compressor Controller ................................................................................ 92
Filter Replacement .................................................................................................................... 93
Replacement Parts ................................................................................................................... 105
Appendix A - Heat Exchanger Corrosion Resistance ................................................................. 106
Appendix B - Thermistor Temperature vs. Resistance Values ................................................... 108
RN Series Startup Form .............................................................................................................. 109
Maintenance Log ........................................................................................................................ 113
Literature Change History........................................................................................................... 114
R90721 · Rev. B · 140225
