Service manual

4-9
T-294-01
whichshould be activeat thispoint. Inarcticmode,the
CCHis energizedfor 30 minutes to warm the oil in the
compressor, and boiloffanyliquidrefrigerantthatmay
be present in the crankcase.
IfPre-Tripisinitiatedduringthe30minutetimeperiod,
Pre-Tripwillbeallowedtorunnormally.OncePre-Trip
is over, the controller will revert to its normal control
mode logic.
Ifambientis warmer than --10.0_C, thesystem willrun
its normal startup logic.
Arcticmode is configurablebyusing the configuration
variable #29, refer to Table 3-1.
CONTROL TRANSFORMER
= 18 Volt Energized Circuit = 24 Volt Energized Circuit = De-energized Circuit
Figure 4-3. Defrost Mode