JOHNSON CONTROLS
6
FORM 150.72-ICOM7
ISSUE DATE: 10/22/2020
TABLE OF CONTENTS (CONT’D)
SECTION 6 – COMMISSIONING .........................................................................................................................97
Preparation – Power Off ................................................................................................................................. 97
Preparation – Power On ............................................................................................................................... 101
SECTION 7 – UNIT CONTROLS ........................................................................................................................105
Introduction ...................................................................................................................................................105
IPU II and I/O Boards ...................................................................................................................................105
Transformer ..................................................................................................................................................106
Display ..........................................................................................................................................................106
Keypad .........................................................................................................................................................106
Unit Switch ...................................................................................................................................................106
Battery Back-Up ...........................................................................................................................................106
Programming # of Compressors ..................................................................................................................106
Status Key ....................................................................................................................................................107
Display/Print Keys ........................................................................................................................................ 114
Entry Keys ....................................................................................................................................................122
Set Points Keys ............................................................................................................................................123
Schedule/Advance Day Key ......................................................................................................................... 124
Program Key ................................................................................................................................................126
Unit Keys ......................................................................................................................................................132
BACnet, Modbus, N2, and Yorktalk 2 Communications ...............................................................................140
SECTION 8 – UNIT OPERATION ......................................................................................................................155
Capacity Control ........................................................................................................................................... 155
Suction Pressure Limit Controls ...................................................................................................................156
Discharge Pressure Limit Controls ............................................................................................................... 156
Leaving Chilled Liquid Control ......................................................................................................................156
Leaving Chilled Liquid Control Override to Reduce Cycling .........................................................................157
Leaving Chilled Liquid System Lead/Lag and Compressor Sequencing ......................................................158
Return Chilled Liquid Control .......................................................................................................................158
Return Chilled Liquid System Lead/Lag and Compressor Sequencing .......................................................159
Anti-Recycle Timer .......................................................................................................................................159
Anti-Coincidence Timer ................................................................................................................................160
Evaporator Pump Control and York Hydro Kit Pump Control .......................................................................160
Evaporator Heater Control ...........................................................................................................................160
Pumpdown Control ....................................................................................................................................... 160
Standard Condenser Fan Control ................................................................................................................160
VSD Fan ....................................................................................................................................................... 161
Changing the Switch Point of the Thermal Dispersion Flow Switch ............................................................. 161
Load Limiting ................................................................................................................................................164
Compressor Run Status ...............................................................................................................................164
Alarm Status ................................................................................................................................................. 164
Remote BAS/EMS Temperature Reset Using a Voltage or Current Signal .................................................. 165
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