T-354
5–14
In the ON position the EBS will be enabled. With the MODE SWITCH in the FULL COOL MODE. The following will
occur simultaneously:
1. The EBS switch will enable EBS input.
2. The phase detection circuit will detect the phase rotation and close to provide power to the compressor contactor.
3. The condenser fan contact will close to energize the condenser contactor and provide power to the con
denser fan motor.
4. The evaporator fan contact will close to energize the high speed evaporator contactor and provide power to
the evaporator fan motor.
5. The EBS electronic module will open the SMV to 100%.
To return the unit to normal operation, place the EBS switch in the NORMAL OPERATION position.
When emergency operation is no longer required, re-install the wire tie at the switch mounting.
5.11.2
Emergency Defrost Operation
To place the unit in the emergency defrost mode of operation, cut the wire tie installed at the switch mounting (see
) and place the switch in the EMERGENCY DEFROST position.
NOTE
If the unit is in the emergency bypass cooling mode, the emergency defrost switch will override this
mode and place the unit in defrost.
The IN-RANGE LIGHT is de-energized when in the emergency defrost mode.
The switch is a normally open four-pole switch, which is placed in the EMERGENCY DEFROST position to:
• De-energize the compressor, condenser fan and evaporator fan contactors.
• Illuminate the EMERGENCY DEFROST LIGHT.
• Energize the heater contactor.
• Illuminate the DEFROST LIGHT.
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 container tempera-
ture and manually cycle operation 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.
5.12 ARCTIC MODE
With arctic mode enabled, if the ambient is colder than -10.0
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 refrig-
erant 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 (14
F), the system will run its normal startup logic.
Arctic mode is configurable by using the configuration variable #29, refer to
.
Summary of Contents for 69NT40-541-306
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