High Pressure Cutout Switch Replacement

Close the suction service valve and pump down the compressor:

• R-134a Compressor: Pump down the compressor to -35 kPa, -0.35 bar, 10 in. vacuum.

• R-23 Compressor: Pump down the compressor to 0 to 21 kPa, 0.0 to 0.2 bar, 0 to 3 psig.

Open the suction service valve slightly to equalize the pressure between 10 and 20 kPa, 0.10 and 0.20 bar, 1 and 3 psig.

Front seat the discharge service valve.

Purge the high pressure from the compressor head through the service port on the discharge line.

Disconnect the leads from the wire harness and remove the switch from the compressor discharge manifold (or remove the sensor from the compressor head).

Apply a refrigeration locktite (sealant) to the threads of the switch (or sensor).

Install and tighten the switch (or sensor). Connect the leads to the wire harness.

Open discharge service valve slightly to pressurize the compressor head and tube assembly. Check for leaks (see “Refrigerant Leak Test Procedure” in this chapter). Front seat the discharge service valve.

If no leaks are found, recover the leak test gas (see “Refrigerant Recovery” in this chapter).

Open the suction service valve and compressor discharge service valve and place the unit in operation.