Table of Contents
Advertisement
SECTION 7 - UNIT CONTROLS ........................................................................................................................103
Introduction ................................................................................................................................................... 103
Microprocessor Board .................................................................................................................................. 103
Unit Switch ................................................................................................................................................... 104
Display .......................................................................................................................................................... 104
Keypad ......................................................................................................................................................... 104
Battery Back-Up ........................................................................................................................................... 104
Transformer ................................................................................................................................................. 104
Single System Select and Programming # Of Compressors ........................................................................ 104
SECTION 8 - UNIT OPERATION ......................................................................................................................133
Capacity Control ........................................................................................................................................... 133
Suction Pressure Limit Controls ................................................................................................................... 133
Discharge Pressure Limit Controls ............................................................................................................... 133
Discharge Air Temperature Control .............................................................................................................. 133
Suction Pressure Control ............................................................................................................................. 135
System Lead/Lag ......................................................................................................................................... 136
Compressor Lead/Lag .................................................................................................................................. 136
Anti-Recycle Timer ....................................................................................................................................... 136
Anti-Coincidence Timer ................................................................................................................................ 136
Evaporator Blower Control ........................................................................................................................... 136
Evaporator Heater Control ........................................................................................................................... 136
Pumpdown Control ....................................................................................................................................... 136
Load Limiting ................................................................................................................................................ 139
Compressor Run Status ............................................................................................................................... 139
Alarm Status ................................................................................................................................................. 139
BAS/EMS Discharge Air Temperature Reset Using a Voltage or Current Signal ........................................ 140
SECTION 9 - SERVICE AND TROUBLESHOOTING .....................................................................................141
Clearing History Buffers................................................................................................................................ 141
Service Mode ............................................................................................................................................... 141
Service Mode - Outputs ............................................................................................................................... 141
Service Mode - Condensing Unit Configuration ..........................................................................................142
Service Mode - Analog and Digital Inputs .................................................................................................... 142
Control Inputs/Outputs ................................................................................................................................. 143
Checking Inputs And Outputs ....................................................................................................................... 145
Optional Printer Installation .......................................................................................................................... 149
SECTION 10 - MAINTENANCE .........................................................................................................................153
Important ...................................................................................................................................................... 153
Compressors ................................................................................................................................................ 153
Condenser Fan Motors ................................................................................................................................. 153
Condenser Coils ........................................................................................................................................... 153
Operating Parameters .................................................................................................................................. 153
On-Board Battery Back-Up ........................................................................................................................... 153
Overall Unit Inspection ................................................................................................................................. 153
BACnet, Modbus and YorkTalk 2 Communications ......................................................................................154
6
Table of contents (cont'd)
Form QCC2-NM1
Issue Date: 5/20/2021
QUANTECH
Advertisement
Table of Contents
Troubleshooting
