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Unit Operation

Post-Start Inspection

Thermostat: Adjust the thermostat setting to above and

below the compartment temperature to check thermostat

operation (see Operating Modes).

Pre-cooling: With the thermostat set at the desired

temperature, run the unit for half-an-hour to one hour (or

longer if possible) before loading the truck. Pre-cooling

eliminates residual heat and acts as a good test of the

refrigeration system.

Defrost: When the unit has finished pre-cooling the truck

interior - the evaporator temperature should have dropped

below 2 C (35.6 F) - initiate a defrost cycle with the manual

defrost switch. The defrost cycle should stop automatically.

Loading Procedure

1. To minimize frost accumulation in the evaporator coil and

a heat increase inside the load compartment, ensure that

the unit is OFF before opening the doors. (The unit may

continue to run when the truck is being loaded in a

warehouse with the doors closed.)

2. Carefully check and record the load temperature when

loading the truck. Note whether any products are out of

temperature range.

3. Load the product in such a way that there is sufficient

space for the air to circulate throughout the load. DO NOT

block the evaporator inlet or outlet.

4. Product should be pre-cooled before loading. Thermo

King units are designed to maintain the load at the

temperature at which it is loaded. Transport refrigeration

units are not designed to reduce the load temperature.

Procedure after loading

1. Ensure that all doors are closed and locked.

2. Adjust the thermostat to the desired temperature setpoint.

3. Start the unit.

4. Half an hour after loading the truck, defrost the unit for a

moment by pressing the Manual Defrost switch. If the coil

temperature drops to below 2 C (35.6 F), the unit will

defrost. The defrost cycle should stop automatically.