COMPONENTS OF THE AIR CONDITIONING Troubleshooting Pressure switches and switches

 Pressure switches and switches
Pressure switches
Pressure switches and switches
Pressure switches are responsible for protecting the air conditioning system against damage
caused by too high or too low pressures. There are low pressure switches, high pressure switches
and trinary switches. The trinary switch comprises the high pressure switch and the low pressure
switch and an additional switch contact for the condenser fan
How they work
The pressure switch (pressure monitor) is normally installed on the high pressure side of the air
conditioning system. In the case that the pressure is too high (approx. 26-33 bar) it switches the
power supply to the compressor clutch off. If the pressure is reduced (approx. 5 bar), its switches
the power supply on again. If the pressure is too low (approx. 2 bar), the power supply is interrupted
as well in order to avoid compressor damage due to insufficient lubrication. The third switch
contact in the trinary switch controls the electrical condenser fan in order to ensure optimum
refrigeration condensation in the condenser
Effects of failure
A defective or failing pressure switch can manifest itself as follows:
- Insufficient cooling performance
 - Frequent switching on and off of the compressor clutch
Air conditioning system without function. There are a number of possible causes of failure:
-Contact fault at electrical connections
-Contaminations in the system
-Damage to the housing caused by vibrations or accidents

Test steps for fault diagnostics:

- Visual inspection
- Check connector block for correct fit
-Inspect component for damage
- Pressure measurement with the compressor switched on and the engine running
-Component test in the disassembled condition with nitrogen gas cylinder, pressure reducer
                       abo bahaa eddine 


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