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• Pressure relief valves are preset to discharge at a set pressure. No attempt should be made to adjust this

setting or to check the setting by discharging the valve. Valves should be removed before testing to a

value in excess of 80% of the valve setting.

• Should the need to replace a valve arise, this can be achieved by shutting off the faulty valve by either

removing the system charge on assemblies fitted with single relief valves or via a dual shut off valve

assembly in which the pressure relief valve is mounted.

• Relief valves that have been found to have discharged refrigerant should be replaced as positive sealing

after discharge is not guaranteed.

• After maintenance a leak test is recommended to avoid any unexpected leaks occur during maintenance

process.

• Inspect the valves and replace according to PED and relevant regulations.

13.

Commissioning and Maintenance of Hubbard Hermetic CCUs

These instructions, recommendations are provided as a guide for the commissioning and maintenance of units

supplied by Hubbard Products Limited. These should be used in conjunction with your company’s health and safety

regulations, written work instructions and working practises to ensure that equipment is installed in a safe working

manner. Further requirements may be specified by the end user or local legislation. Risk assessments should be

carried out to ensure the safety of those conducting the work and anybody who may come into contact with the

equipment during any of these procedures. Please ensure you are equipped with the correct and appropriate PPE,

personnel protection equipment before commencing any work. Any work carried out should be completed by

competent qualified personnel.

Commissioning Index;

13.1 Leak testing by pressure testing

13.2 Vacuuming

13.3 Electrical testing

13.4 Charging Refrigerant

13.5 Commissioning

13.6 Operational Checkout

13.7 Lubricant Oil COndition

13.1 Leak testing by Pressure Testing

Before pressure test it is necessary to identify the refrigerant for operation, positions of all pressure relief valves

fitted and values, devices with restrictive pressure values ( e.g. LP switches) , and the system design maximum

operating pressures. The maximum operating pressures of the high and low side of the system will be stated on

the serial plate, note however that safety switches should be set 10% below these values to prevent pressure relief

valves discharging.

If you intend to pressure test with the pressure relief valves fitted the maximum values for test should be:

If high side pressure relief valves are fitted only:

High side: 80% of high PRV valve rating.

Low side: 80% of high PRV valve rating*

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