4
Supply Fans........................................................................................................................63
Power Exhaust Motor and Belt Removal .............................................................................64
DX Cooling ........................................................................................................................65
Condensate Drain Pans .......................................................................................................65
Brazed Plate Heat Exchanger Cleaning ................................................................................65
E-Coated Coil Cleaning ......................................................................................................66
Microchannel Coil Cleaning................................................................................................67
Options ..................................................................................................................................69
Heating Coils......................................................................................................................69
Chilled Water Coil ..............................................................................................................70
Packaged Direct Expansion (DX) Units ...............................................................................71
Variable Capacity Compressor Controller ............................................................................72
Evaporator Coil (6-25 and 30 ton) .......................................................................................74
Condenser Fans (6-25 and 30 ton) .......................................................................................74
Suction Filter (55, 65 and 75-140 ton) .................................................................................75
Suction Filter Removal Instructions .................................................................................76
Refrigerant-to-Water Heat Exchanger..................................................................................76
Water-Source Heat Pump Applications ............................................................................76
Open Loop Applications..................................................................................................76
Freezing Water in the Heat Exchanger .............................................................................77
Water Piping...................................................................................................................78
Energy Recovery Units .......................................................................................................80
Aluminum Energy Recovery Wheel.................................................................................81
Polymer Energy Recovery Wheel ....................................................................................83
Energy Recovery Wheel General Cleaning ......................................................................90
Energy Recovery Wheel Defrost Timer Setting ...............................................................92
Gas or Electric Heating .......................................................................................................92
Electric Preheat...................................................................................................................94
Status Display Screens ....................................................................................................94
System Setting Screens ...................................................................................................95
LED Flash Alarm Codes .................................................................................................96
Operation........................................................................................................................97
Gas Heating........................................................................................................................97
Piping Sizing Examples...................................................................................................99
Inlet and Manifold Pressures ...........................................................................................99
Gas Pressure Regulator & Overpressure Protection Device............................................. 100
Piping Supports............................................................................................................. 100
Additional Gas Piping Considerations............................................................................ 100
Leak Testing ................................................................................................................. 104
Gas Heater Operating Instructions ................................................................................. 105
Gas Heating Maintenance.............................................................................................. 106
Gas Heat Exchanger Removal ....................................................................................... 106
Phase and Brownout Protection Module ............................................................................ 108
Filter Replacement............................................................................................................ 110
Replacement Parts ............................................................................................................ 120
Appendix A - Heat Exchanger Corrosion Resistance.............................................................. 121
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