(a) Sketch and describe a high pressure cut-out in a refrigeration system.
(6)
(b) The refrigeration compressor has stopped due to operation of the h. p. cut-out. Explain –
(i) The possible causes.
(ii) How these causes would be found and possible remedies.
(6)
(c) What steps are taken if the compressor "short-cycle" on low pressure cut-out?
(4)
Reference Answer
### (a) High Pressure (HP) Cut-Out: Sketch and Description **Purpose:** The High Pressure (HP) cut-out is a critical safety device fitted to the compressor discharge line in a refrigeration system. Its primary function is to protect the system from over-pressurization. It stops the compressor motor automatically if the discharge pressure exceeds a pre-set safe limit, thereby preventing damage to the compressor, condenser, piping, and potential rupture of the system leading to a loss of refrigerant. **Construction:**
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