High Pressure Cutout Switch

A high pressure cutout switch is located on the compressor discharge service manifold of each compressor. If a high pressure cutout switch is suspected of being defective, replace it with a known good switch.

Parent topic: Electrical Maintenance

R-23 High Pressure Cutout Switch

If the R-23 compressor discharge pressure rises above 3250 ± 50 kPa, 32.5 ± 0.5 bar, 470 ± 7 psig, the high pressure cutout opens to interrupt the ground circuit to the compressor contactor:

  • R-23 compressor STOPS immediately.

  • LCD Display Message: No response to R-23 high pressure cutout.

  • Evaporator and condenser fans and R-134a compressor continue normal operation.

  • R-23 compressor will restart when the overload condition is corrected (switch closes) as long as power is available. The high pressure switch resets (closes) when the pressure drops to 2590 ± 250 kPa, 25.9 ± 2.5 bar, 375 ± 38 psig.

R-134a High Pressure Cutout Switch

If the R-134a compressor discharge pressure rises above 2410 ± 68 kPa, 24.1 ± 0.68 bar, 350 ± 10 psig, the high pressure cutout opens to interrupt the ground circuit to the compressor contactor:

  • R-134a compressor STOPS immediately.

  • LCD Display Message: R-134a high pressure cutout feedback missing.

  • Evaporator and condenser fans continue normal operation.

  • R-23 compressor stops.

  • R-134a compressor will restart when the overload condition is corrected (switch closes) as long as power is available. The high pressure switch resets (closes) when the pressure drops to 1640 ± 68 kPa, 16.4 ± 0.68 bar, 238 ± 10 psig.

  • R-23 compressor will restart 30 seconds after R-134a compressor restarts.