Test of high pressure switch in refrigeration system

Test of high pressure switch in refrigeration system

In general,high pressure switch self-protection action may occur  in spring, summer influenced by Environment and temperature,so it is recommended to do Irregular inspection of compressor high pressure switch.In this test process, there may drive pressure relief valve action, refrigerants release and so on.

The installation of a pressure gauge during the testing process will minimize the occurrence of the above phenomena.

Step 1: Observe the identification  value

Observe the identification value of high pressure switch and pressure relief valve.

High pressure switch 

Pressure Relief Valve

Step 2: Install the pressure gauge

When testing,high pressure switch must be connected to the corresponding pressure gauge, Confirme the corresponding unit of pressure gauge, always pay attention to the rising value of pressure gauge to Determine whether the value of the gauge rise has reached the action value of the high pressure switch or is close to the identification value of the pressure valve..the high pressure switch will work and stop the compressor when the value of the pressure gauge rises to the action value , and there will be an alarm and a belly sound.

Step 3: Shut down the compressor

If the pressure gauge rises to the action value of the high pressure switch, but the compressor does not stop and the pressure gauge continues to rise, you must immediately manually stop the compressor.

Step 4: Turn on the condenser

Turn on the condenser and lower the exhaust pressure of the system. To prevent the exhaust pressure from rising to the pressure relief valve identification value.

Step 5: replace the high pressure switch

This condition indicates that the high pressure switch is broken and replace the high pressure switch. In the above operation steps, the installation of pressure gauge is the key step, need more attention in the actual operation . This method is suitable for the field test of high pressure switch to avoid unnecessary loss.