Manual Defrost - Carrier Supra 950MT Operation & Service Manual

Truck refrigeration units with cab command controller

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3.9

MANUAL DEFROST

1. Press the MANUAL DEFROST key to initiate defrost.

Defrost mode may be initiated in two different ways if the evaporator coil is below 45°F (7.2°C):

•

Defrost is initiated automatically at preset intervals by the defrost timer in the microprocessor.

•

The defrost mode may be manually initiated by pressing the MANUAL DEFROST key.

The defrost mode terminates when the evaporator temperature is higher than 55°F (12.8°C). Should the defrost

cycle not complete within 45 minutes, the defrost cycle is terminated automatically by the microprocessor.

After the 45 minute termination, the microprocessor will wait 1.5 hours before attempting another defrost cycle.

Pressing the MANUAL DEFROST key will override this mode and start a defrost cycle.

If a shutdown alarm occurs, defrost will be terminated. Refer to

Mode.

62-11863

3-8

Section 3.15.2

for more information on Defrost

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