Service manual

T--318
4-- 10
CAUTION
The unit will remain in the DEFROST mode
as long as the emergency defrost switch is
in the DEFROST position. To prevent cargo
damage, the operator must monitor con-
tainer temperature and manually cycle op-
eration as required to maintain temperature
within required limits.
To return the unit to normal operation, place the switch in
the NORMAL OPERATION position. When emergency
defrost is no longer required, re-install the wire tie at the
switch mounting.
4.12 ARCTIC MODE
With arctic mode enabled, if the ambient is colder than
-10.0 degrees C there is a 30 minute time delay at
startup for any of the components in the system, except
for the controller and the compressor crankcase heater
(CCH), which should be active at this point. In arctic
mode, the CCH is energized for 30 minutes to warm the
oil in the compressor and boil off any liquid refrigerant
that may be present in the crankcase.
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 3-4.