General Operation

In truck-driven units, temperature control is based on two values: The setting (Setpoint) of the electronic thermostat and the evaporator return temperature. The difference between these two temperatures will determine the mode of operation: cool, heat, or null.

• Cool: When the temperature in the load compartment is higher than the setpoint, the unit runs in cool mode to reduce the evaporator return temperature.

• Heat: When the temperature in the load compartment is lower than the setpoint, the unit changes to heat mode to raise the evaporator return temperature.

• Null: Once the Setpoint Temperature has been reached, and while the temperature remains between XºC/F above or below the setpoint, there is no demand for transfer of heat or cold, and the unit runs in null mode.

• Defrost: After a scheduled period of time in cool mode, between 1 and 8 hours, the unit runs in this fourth mode of operation to eliminate ice that has accumulated in the evaporator or condenser coil. Defrost can be initiated automatically or manually.

Factory setting for X is 3ºC (5ºF). During unit installation, this value can be adjusted by between 1 and 5ºC (2 and 9ºF) in increments of 1ºC/F.

Units with R-134a refrigerant: Units Recommended for Fresh Cargo applications. Temperatures can be controlled from -20ºC to +22ºC (-4ºF to +71ºF)-10ºC to +22ºC (14ºF to +71ºF).

Units with R-404A /R-452A refrigerant: Temperatures can be controlled from -20ºC to +22ºC (-4ºF to +71ºF).

Year of manufacture: Reference Serial Plate.

Installation and commissioning are to be carried out by an authorised Thermo King Dealer in accordance with Thermo King procedures and drawings. Exceptions to this with the written authorisation of the manufacturer only.