Class 2 (2nd Engineer) MEP 📅 Aug 2025

Exam Question

(a) With the aid of a simple sketch, explain the "trouble spots" in a basic air-conditioning unit.

(b) With reference to your sketch, explain the following:-

(i) How the problem of increase in humidity of cooled air is overcome?

(ii) How discomfort caused by the excessive drying effect of heated air is overcome?

Reference Answer

Trouble Spots in a Basic Air Conditioning Unit
Refrigerant Leakage: Commonly occurs at the compressor shaft seal, condenser, dryer, oil separator, evaporator coils, or damaged pipes.
Condenser: Insufficient water or air flow and dirty tubes may cause high-pressure (HP) trip.
Filters: Blocked intake and recirculation filters lead to poor airflow.

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