Carrier PrimeLINE Operation And Service Manual page 53

Code Description
Cd50 QUEST Enable / Disable
Cd50 enables or disables QUEST Mode, which is a power saving option that reduces energy
requirements. Cd50 applies to either QUEST or QUEST II, depending on which option was chosen for the
particular unit. QUEST II provides additional savings over QUEST. Configuration variables CnF60 and
CnF65 determine the QUEST option available for the unit.
If the unit is not configured for QUEST Mode, then dashes will be displayed "-----".
Turn On QUEST Mode:
Select "On" and press the ENTER key to enable QUEST Mode.
When QUEST Mode is enabled:
• Setpoint is maintained in Steady State Perishable mode after Perishable Pulldown.
• QUEST cycles the compressor on and off according to Return Air temperature and dehumidification
is not allowed.
• QUEST II cycles the compressor or the heaters on and off according to Return Air temperature and
dehumidification is allowed.
QUEST Mode Suspended:
If "On" is selected, QUEST operation may be suspended as indicated by one of the suspension codes
listed below. If QUEST is not "OFF" and is not suspended, "On" will be displayed.
"SEtPt" = suspended by setpoint too low.
"CAHUM" = suspended by CA or humidity control.
"ACt" = suspended by ACT active.
"FAIL" = all return temperature probe failure for QUEST.
"PrtrP" = Pre-Trip Active.
"C LIM" = suspended by cool limit logic.
"PULL" = pulldown active.
"ALArM " = suspended by shutdown alarm
Turn Off QUEST Mode:
QUEST Mode is turned off automatically when any Trip Start occurs or Pre-Trip test is initiated.
Select "OFF" and press ENTER to disable QUEST Mode manually.
Table 4–4 Controller Function Codes
4–13 T-362