OICEW Task 4.3.V

Secure refrigeration system

MMA Method

In order to satisfy NVIC 17-14 Task 4.3.V , MMA students must:

NVIC Method

See NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Operate main and auxiliary machinery and associated control systems

OICEW-A4.3 Preparation, operation, fault detection and necessary measures to prevent damage for the following machinery items and control systems

Other auxiliaries including refrigeration, air- conditioning and ventilation systems
Condition Behavior Standard

On a vessel of at least 1,000 HP, on a simulator, or in a laboratory,

the candidate secures an air-conditioning or refrigeration system.


All The assessment is required for all OICEW endorsements regardless of any limitations for propulsion mode and/or vessel equipment.

The candidate:

  1. While the compressor is running, closes the main liquid line (king) stop valve;

  2. Allows the compressor to cycle off in automatic by the action of the low pressure cut-out switch;

  3. While observing the refrigerant receiver level, ensures that the compressor does not restart by the action of the low pressure cut-out switch and insures that the system is completely pumped down to the receiver;

  4. With compressor shutdown and not short-cycling, depresses the motor controller stop button;

  5. Keeps power available to the compressor motor for the purpose of maintaining the crankcase oil warm via the heater circuit;

  6. Isolates the compressor by closing the suction and discharge stop valves;

  7. Isolates the water-cooled condenser by closing the condensing water isolation valves (drains the condenser watersides if required); and

  8. For chillers, isolates the chiller by closing the chilled water isolation valves.