Electrical System
The unit’s controls and refrigeration components operate on 12 Vdc.
Electric Standby units have a standby motor that operates on 230 Vac, taking power from vehicle battery. A transformer in the condenser unit converts the 230 Vac to 12 Vdc to operate the unit’s controls and refrigeration components.
These units have a hermetic motor-compressor. This compressor is powered from the Compressor Drive Module (CDM), which is a 12/230 VAC inverter, taking power from either or all of the following battery sources (depending on the options supplied in the unit):
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Vehicle Battery
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Auxiliary Battery (option)
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Extended Battery in hold-over functionality (if activated)
These units have a semi-hermetic motor-compressor taking power from either of the following sources (depending on the options supplied in the unit):
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Vehicle Battery
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Auxiliary Battery (if installed by the vehicle manufacturer/dealer)
Two AC/DC converters in the condenser unit converts the shore power supply to 12 Vdc to operate the unit’s controls and refrigeration components in stand-by mode. The unit also features START/STOP and Increased Idle Speed functionalities to enhance refrigeration performance during extended engine stops due to vehicle START/STOP activation (e.g., traffic jams, urban areas with many traffic lights). These functionalities require external vehicle support for START/STOP control and Increased idle speed adjustment. For further details, consult your Thermo King Dealer Representative.