Table of Contents
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Section 6: Commissioning .................................................................................................................................121
Preparation, with power off ........................................................................................................................... 121
Commissioning the pump VFD ..................................................................................................................... 124
Preparation, with power on ........................................................................................................................... 124
Determining proper oil levels .................................................................................................................... 128
Section 7: Unit controls ......................................................................................................................................133
Introduction ................................................................................................................................................... 133
IPU II and I/O boards .................................................................................................................................... 133
Transformer ................................................................................................................................................. 134
Display .......................................................................................................................................................... 134
Keypad ......................................................................................................................................................... 134
Unit switch .................................................................................................................................................... 134
Battery backup ............................................................................................................................................. 134
Programming the number of compressors ................................................................................................... 134
Status key ..................................................................................................................................................... 135
Display/print keys ......................................................................................................................................... 144
Entry keys ..................................................................................................................................................... 152
Setpoints keys .............................................................................................................................................. 153
Schedule/advance day key .......................................................................................................................... 154
Program key ................................................................................................................................................. 156
Unit keys ...................................................................................................................................................... 162
BACnet, Modbus, N2, and Yorktalk 2 communications ................................................................................ 170
Section 8: Unit operation ....................................................................................................................................175
Capacity control ............................................................................................................................................ 175
Suction pressure limit controls ..................................................................................................................... 176
Discharge pressure limit controls ................................................................................................................. 176
Leaving chilled liquid control ........................................................................................................................ 176
Leaving chilled liquid control override to reduce cycling .............................................................................. 177
Leaving chilled liquid system lead/lag and compressor sequencing ............................................................ 178
Return chilled liquid system lead/lag and compressor sequencing .............................................................. 178
Anti-recycle timer .......................................................................................................................................... 178
Anti-Coincidence Timer ................................................................................................................................ 178
Evaporator pump control and YORK hydro kit pump control........................................................................ 178
Evaporator heater control ............................................................................................................................. 179
Pumpdown control ........................................................................................................................................ 179
Standard condenser fan control ................................................................................................................... 179
VSD fan ........................................................................................................................................................ 179
Changing the switch point of the thermal dispersion flow switch ................................................................. 179
Load limiting ................................................................................................................................................. 183
Compressor run status ................................................................................................................................. 183
Alarm status ................................................................................................................................................. 183
Remote BAS/EMS temperature reset using a voltage or current signal ...................................................... 184
6
Table of contents (cont'd)
Form 150.72-ICOM6
Issue date: 12/19/2023
Johnson Controls
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Table of Contents
Troubleshooting
