Air Conditioning

Air Conditioning

Air Conditioning:

The air conditioning (A/C) system components are:
- A/C Compressor
- Condenser core
- Evaporator core
- Thermostatic expansion valve
- Desiccant bag
- Connecting refrigerant lines

The refrigeration system operation is controlled by the:
- Thermostatic expansion valve.
- Evaporator discharge temperature sensor.
- Pressure cut off switch.
- Engine control module (ECM).
- Remote climate control module (RCCM).

The refrigerant system incorporates a variable capacity A/C compressor.

The RCCM monitors the evaporator discharge temperature sensor and communicates with the ECM to control A/C compressor operation. The RCCM also monitors the ambient air temperature and disables A/C operation when the ambient air temperature is below 0 degree C (30 degree F).

The pressure switch is located in the A/C compressor discharge line and communicates with the ECM. If high or low refrigerant pressures are experienced, the ECM will interrupt A/C compressor operation.

The pressure relief valve is installed in the A/C compressor and protects the system from excessively high refrigerant pressure.

The thermostatic expansion valve, which is mounted to the evaporator core supply and return lines, contains an adjustable orifice which provides the restriction that separates the high and low pressure liquid phases in the refrigerant system.