Cold Chain Trailers Power and Ignition — Location Guide
User Guide
4 mins to read
This document is a reference guide for the power and ignition location and connection points in all supported refrigerated units (trailers).
Possible connection points for the three-wire harness
Introduction
This document is a reference guide for the power and ignition location and connection points in all supported refrigerated units (trailers).
If you cannot find a certain unit, or if the connection point location has changed or is not available, please contact the Support team.
The following table outlines the three signals you need to find in order to perform the installation:
Signal | Definition |
Constant Power (VCC) | Input voltage (12V) comes from the trailer’s true battery source, which is live at all times. This connection point is connected to the red wire on the three-wire harness. |
Ground (GND) | The reference point directly comes from the power supply (battery) terminal, and the trailer’s chassis. This connection point is connected to the black wire on the three-wire harness. |
Ignition | The ignition sense wire must be connected to a refrigeration unit’s controller ignition source.
This connection point is connected to the yellow wire on the three-wire harness. |
! IMPORTANT: All signals to be connected must be measured (voltage for constant power and ignition, and conductivity for the chassis, for example) and validated during the installation prior to the wiring, as they may vary between installations.
Thermo King
Smart Reefer controller boards
✱ NOTE: If you are installing the solution using an IOX-COLD RUGGED, the three-wire connection does not need to be connected to the controller boards as they are already wired in the cold chain harness. For more information, refer to the Thermo King Smart Reefer 2, 3, and 4 Installation Guide.
Smart Reefer 3 controller board (SR-3)
This section outlines the connection point location for all refrigeration units containing a SR-3 controller board.
The SR-3 controller board is inside the unit’s right compartment.
Thermo King refrigeration unit compartment | SR-3 controller board |
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Signal | Location |
Constant Power (VCC) | Ring terminal — J24 (2) or J25 (2A) |
Ground (GND) | Ring terminal — J23 (CH) |
Ignition | Connectors — J12, J13, or J14 pin 6 (wires 8XP-BLK3 or 8XP) The following image shows a rear view of the connector and the corresponding pin:
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Smart Reefer 4 controller board (SR-4)
This section outlines the connection point location for all refrigeration units containing a SR-4 controller board.
The SR-4 controller board is inside the unit’s right compartment.
Thermo King refrigeration unit compartment | SR-4 controller board |
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Signal | Location |
Constant Power (VCC) | Ring terminal — 2AH, 2, or 2A |
Ground (GND) | Ring terminal — CH |
Ignition | Connectors — J12 or J13 pin 6 (wires 8XP-BLK3 or 8XP) The following image shows a rear view of the connector and the corresponding pin:
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Carrier
X2100A (advanced controller)
The X2100A controller board is inside the unit’s right compartment.
Carrier refrigeration unit compartment | X2100A controller board |
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Signal | Location |
Constant Power (VCC) | You have the following options to connect the VCC:
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Ground (GND) | Chassis ring terminal, located on the upper right part of the controller board:
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Ignition | Refrigeration unit ON/OFF switch: HC11-1RS2 wire |
Vector (advanced controller)
The Vector controller board is inside the unit’s right compartment.
Signal | Location |
Constant Power (VCC) |
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Ground (GND) |
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Ignition |
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