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13.5 Commissioning

Commissioning Step One

1. Remove the main fuses or switch off the circuit breakers for the compressor.

2. Switch on the main isolator on the unit.

3. Switch on each system, individually; checking as the systems are brought on that fans, lights etc. are operating

properly. Check liquid solenoid valves operation and rotation of condenser fans (when fitted). When satisfied that

all systems are functioning, switch off main supply.

4. Replace compressor fuses or switch on circuit breaker for the lead compressor only to ensure all systems are

refrigerating during commissioning.

5. If additional oil is needed, please add through the valve in 1st stage suction line.

6. Switch on the main isolator. Providing enough refrigerant is in the system, the lead compressor will start up and

adding more refrigerant to the plant can commence.

Commissioning Step Two

Charging of the system should continue until the receiver is approximately 25% full, and the discharge pressure

approaching design value. When this condition has been reached, shut off all charging cylinders and allow the

compressor to run normally.

Check now that all the systems/stubs are refrigerating satisfactorily, evaporators fully frosted etc.

Commissioning Step Three

Now replace remaining compressor fuse circuit breakers and allow electronic compressor controller to stage in

compressors as required.

Commissioning Step Four

During the general commissioning the following electrical items should be checked:

1. Sub fuses, circuit breakers correct.

2. Main fuses, circuit breakers are correct and balanced.

3. Main compressor fuses and circuit breakers are correct.

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P4115S Rev 02