Table of Contents
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SECTION 6 - COMMISSIONING ....................................................................................................................... 111
Preparation - Power Off ............................................................................................................................... 111
Commissioning the Pump VFD .................................................................................................................... 114
Preparation - Power On ............................................................................................................................... 114
Determining Proper Oil Levels ..................................................................................................................... 118
SECTION 7 - UNIT CONTROLS ........................................................................................................................123
Introduction ................................................................................................................................................... 123
IPU II and I/O Boards ................................................................................................................................... 123
Transformer ................................................................................................................................................. 124
Display .......................................................................................................................................................... 124
Keypad ......................................................................................................................................................... 124
Unit Switch ................................................................................................................................................... 124
Battery Backup ............................................................................................................................................. 124
Programming the Number of Compressors .................................................................................................. 124
Status Key .................................................................................................................................................... 125
Display/Print Keys ........................................................................................................................................ 133
Entry Keys .................................................................................................................................................... 141
Setpoints Keys ............................................................................................................................................. 142
Schedule/Advance Day Key ......................................................................................................................... 143
Program Key ................................................................................................................................................ 145
Unit Keys ..................................................................................................................................................... 151
BACnet, Modbus, N2, and Yorktalk 2 Communications ............................................................................... 159
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: 08/03/2022
JOHNSON CONTROLS
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