Electronic Control System

Thermo King direct drive refrigeration units are composed of a condenser unit, an evaporator unit, a vehicle compressor and a control panel (Incab Control Box) which operates the unit. The Electronic Control System is composed of an Electronic Control Module (located inside the condenser unit) and the In-cab Control Box. This In-cab Control Box allows the truck driver to operate the Thermo King refrigeration unit.

In-cab Control Box

Parent topic: Unit Description

Description of the Electronic Control System

The Electronic Control System has the following characteristics:

  • Auto Start

  • Delayed Start

  • Active Display

  • Low Battery Voltage Alarm

  • Battery voltage value display

  • Unit Control without In-cab Control Box

  • Manual or Automatic Defrost

  • Return Air Temperature Sensor

  • Setpoint Temperature Reading

Auto Start: In case of power shut off, if the unit was on, the unit will come back on again when the power is re-started.

Delayed Start: After an automatic start-up, the unit will remain inactive for few seconds.

Active Display: The In-cab Control Box display is always active except when the unit is disconnected (no power) or when the unit is connected but has been manually switched off from the In-cab Control Box (when there is no active alarm).

Total Hourmeter: Total number of hours the unit is in operation.

Vehicle Compressor Hourmeter: Number of hours the unit has been operating on-the-road.

Low Battery Voltage Alarm: Disconnects the unit when the battery voltage is too low.

Battery voltage value display: The battery voltage value is displayed in the information menu.

Unit Control without In-cab Control Box: The unit can also be operated by the Electronic Control System without the In-cab Control Box, under conditions selected by the In-cab Control Box before it is disconnected.

Manual or Automatic defrost: It is possible to choose between manual or automatic defrost and to select the defrost time interval in auto defrost mode.

Return Air Temperature Sensor: On-screen reading of the temperature in the load compartment.

Setpoint Temperature Reading: On-Screen Setpoint Temperature Reading.

Unit Controls

    Warning
  • Risk of Injury
  • Never operate the unit unless you completely understand the controls; otherwise serious injury may occur.

In-cab Control Box — Display, Keys and Symbols

  1. Display. It is always active except when the unit is disconnected (no power) or when the unit is connected but has been manually switched off from the In-cab Control Box. It normally displays the return air temperature.

  2. ON/OFF Key. This key is used to start/stop the unit by holding the key down for at least 1 second. Single press for exit to the previous level menu.

  3. Set Key. Selects prompt screens and information screens. Single press: enter the next level menu.

  4. Up Key. Is used to increase the setpoint temperature, display values, and for menu scroll up.

  5. Down Key. Is used to reduce the setpoint temperature, display values, and for menu scroll down.

  6. Cool Symbol. The unit is cooling.

  7. Heat Symbol. The unit is heating.

  8. ºC/ºF Display. Indicates whether the on-screen temperature reading is in degrees Celsius (ºC) or degrees Fahrenheit (ºF).

  9. Alarm Symbol. Indicates that there is an alarm in the system.

  10. Defrost Symbol. Indicates the evaporator unit is in Defrost Mode.

  11. Dot Symbol (decimal). Indicates power presence, only when unit is off.