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Class 4 (4th Engineer) MEKG 📅 Sep 2022

Exam Question

(a) Sketch and describe a high pressure cut-out in a refrigeration system. (5)

(b) The refrigeration compressor has stopped due to operation of the h. p. cut-out. Explain

(i) The possible causes. (3)

(ii) How these causes would be found and possible remedies. (3)

(c) What steps are taken if the compressor "short-cycle" on low pressure cut-out? (5)

Exam question diagram

Reference Answer

### (a) High Pressure Cut-Out: Sketch and Description
**Purpose and Location:**
The High Pressure (HP) Cut-Out is a critical safety device fitted in a refrigeration system to protect the compressor, condenser, and piping from dangerously high pressures. It is a pressure-operated switch that senses the pressure on the high-pressure side of the system, typically located on the compressor's discharge manifold or the discharge line leading to the condenser. Its primary function is to stop the compressor motor electrically if the discharge pressure exceeds a pre-set safe limit.
**Construction and Operation:**

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