Carrier 69NT40-511-199 - Manual (Page 88)

SECT
IO
N
4
4-13 T-268-07
If Pre-Trip is initiated during the 30 minute time period,
Pre-Trip will be allowed to run normally. Once Pre-Trip
is over, the controller will revert to its normal control
mode logic.
If ambient is warmer than --10.0_C, the system will run its normal startup logic.
Arctic mode is configurable by using the configuration
variable #29, refer to Table 3-1.
CONTROL TRANSFORMER
= 18 Volt Energized Circuit = 24 Volt Energized Circuit = De-energized Circuit
Figure 4-5. Defrost