GVZC20 Service Manual

SERVICING
89
CTK04 ADDENDUM
CTK04 ADDENDUM
3. Follow screen for System Status.
TS Time Stamp (Compressor run time)
MD
Current system operational Mode
(cooling, cooling startup, heating, heating startup, oil
return, defrost, stop)
CRM Compressor Reduction Mode
RAD
Requested and Actual percentage Demand
(Requested Demand, Actual cooling / heating provided)
RAF
Requested and Reported ID airflow
(Requested CFM, Actual CFM)
ATOF*
Outdoor Air Temperature, Outdoor Fan speed
(OD air temperature, OD Fan RPM)
DCT
Discharge Temperature, Outdoor Coil Temperature
DLT Defrost sensor temperature, Outdoor Liquid Temperature
PSDST**
Pressure sensor reading
Suction Pressure (cooling mode)
Discharge pressure (heating mode)
* Only for *VZC20**1AB or later revision.
ATPRM is shown in *VZC20**1AA revision.
** Only for *VZC20**1AB or later revision.
PSD is shown in *VZC20**1AA revision.
HEAT PUMP WITH OUTDOOR TEMPERATURE
LOCKOUTS
It is recommended to set the outdoor temperature lock-
outs during the initial thermostat set up. This will enable
the compressor to be turned o󰀨 and switch heating source
from refrigeration to auxiliary/secondary heating under low
ambient conditions.
Line set length
range (feet)
Compressor lockout
temperature
(°F)
0 to 100 15
100 to 200 20
For example if the line set is 125 feet, it is recommended
to set the compressor lockout temperature at 20 °F during
initial set up. In order to access the compressor lockout
temperature, Press MENU and scroll down to press IN-
STALLER OPTIONS. Enter the date code (password) when
prompted. Choose VIEW / EDIT CURRENT SETUP and
COMPRESSOR LOCKOUT / BALANCE POINT will be un-
der HEAT / COOL CONTROL OPTIONS. For more informa-
tion please refer to COMFORTNET™ CTK04 Communicat-
ing Thermostat SYSTEM INSTALLATION GUIDE.
RPM
HEAT PUMP