Refrigeration & Air Conditioning Mechanic Red Seal · Question
A high-pressure switch on a chiller using R-134a has a cut-out setting of 1200 kPa. If the system's operating condensing pressure is typically 950 kPa at 35°C ambient, at what pressure will the switch open and stop the compressor?
A high-pressure switch is designed to open and shut down the compressor when the system pressure exceeds its preset cut-out value. Therefore, it will open preci
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Question: A high-pressure switch on a chiller using R-134a has a cut-out setting of 1200 kPa. If the system's operating condensing pressure is typically 950 kPa at 35°C ambient, at what pressure will the switch open and stop the compressor?
Answer options:
- 950 kPa ✅ 1200 kPa
- Approximately 1050 kPa once pressure stabilizes.
- Only if the system experiences a refrigerant leak.
Correct answer: 1200 kPa
Explanation: A high-pressure switch is designed to open and shut down the compressor when the system pressure exceeds its preset cut-out value. Therefore, it will open precisely at the 1200 kPa setting if system pressure reaches or exceeds this point.
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