Initiating a Zone Manual Defrost Cycle

Defrost cycles are usually initiated automatically based on time or demand. Manual defrost may also be available. Defrost is only available if the unit is running and the evaporator coil temperature is less than 45°F (7°C). Other features such as door switch settings may not allow manual defrost under some conditions.

From the Standard Display, press the Enter Key to put the unit in Manual Zone Selection mode. Press the Enter Key again as required to select the desired zone. In the example shown ( Zone 2), Zone 2 has been selected.

Zone 2

To initiate a manual defrost cycle in the selected zone, press the DEFROST Key as shown ( Defrost Key). If zone conditions allow, the zone will enter a defrost cycle and the amber LED next to the DEFROST Key will glow.

Defrost Key

Important During the defrost cycle, the box temperature of the zone in defrost will rise toward 50°F (10°C). This is normal and is caused by the defrost cycle warming the evaporator coil. Since the evaporator fans are turned off during the defrost cycle, this warm air is not circulated in the truck box.
Parent topic: Truck Standard Display HMI Control Panel

Terminating a Defrost Cycle

The defrost cycle terminates automatically when the evaporator coil temperature is greater than or equal to 52°F (11°C) or the defrost timer expires. When the defrost cycle is completed the amber LED next to the DEFROST Key will turn off. Defrost can also be terminated by turning the unit off and back on.