Tag: ac cycling switch

The purpose of the cycling switch in a cycling clutch system is to control the evaporator temperature above the freezing point by controlling the the operation of the a/c compressor clutch. Based on pressure input from the low side of the a/c system the cycling switch will open power to the a/c compressor clutch coil when the pressure/temperature is so low that could cause the evaporator to freeze up. Once the pressure/temperature has stabilized the cycling switch closes its contacts again allowing power to the air conditioning compressor clutch coil and compressor operation is allowed until it lowers the pressure/temperature near the evaporator freezing point, where the cycle repeats again.

Symptoms of a Bad or Failing AC Clutch Cycling Switch.

In cycling clutch systems with a fixed orifice tube, a low-pressure or cycling clutch switch is placed in series with the compressor clutch circuit so it can turn the clutch on or off.

Air conditioning system protection devices.

The AC cycling switch de-energizes the clutch and stops the compressor if the pressure gets below a certain level (usually about 20-25 psi) .It closes and turns on the compressor at about 40-47 psi.

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