Quantech
6
Form QTC3-NM1
Issue date: 12/19/2023
Table of contents (cont’d)
Section 6: Commissioning ................................................................................................................................. 117
Preparation, with power off ........................................................................................................................... 117
Commissioning the pump VFD .....................................................................................................................120
Preparation, with power on ...........................................................................................................................120
Determining proper oil levels .................................................................................................................... 124
Section 7: Unit controls ......................................................................................................................................129
Introduction ...................................................................................................................................................129
IPU II and I/O boards ....................................................................................................................................129
Transformer .................................................................................................................................................130
Display ..........................................................................................................................................................130
Keypad .........................................................................................................................................................130
Unit switch ....................................................................................................................................................130
Battery backup .............................................................................................................................................130
Programming the number of compressors ...................................................................................................130
Status key .....................................................................................................................................................131
Display/print keys .........................................................................................................................................140
Entry keys .....................................................................................................................................................148
Setpoints keys ..............................................................................................................................................149
Schedule/advance day key ..........................................................................................................................150
Program key .................................................................................................................................................152
Unit keys ......................................................................................................................................................158
BACnet, Modbus, N2, and YORKTalk 2 communications ............................................................................166
Section 8: Unit operation ....................................................................................................................................171
Capacity control ............................................................................................................................................171
Suction pressure limit controls .....................................................................................................................172
Discharge pressure limit controls .................................................................................................................172
Leaving chilled liquid control ........................................................................................................................172
Leaving chilled liquid control override to reduce cycling ..............................................................................173
Leaving chilled liquid system lead/lag and compressor sequencing ............................................................174
Return chilled liquid system lead/lag and compressor sequencing .............................................................. 174
Anti-recycle timer ..........................................................................................................................................174
Anti-Coincidence Timer ................................................................................................................................174
Evaporator pump control and Quantech hydro kit pump control ..................................................................174
Evaporator heater control ............................................................................................................................. 175
Pumpdown control ........................................................................................................................................175
Standard condenser fan control ...................................................................................................................175
VSD fan ........................................................................................................................................................175
Changing the switch point of the thermal dispersion flow switch .................................................................175
Load limiting .................................................................................................................................................179
Compressor run status .................................................................................................................................179
Alarm status .................................................................................................................................................179
Remote BAS/EMS temperature reset using a voltage or current signal ......................................................180