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14.5 Pressure Relief Valve/s

1. Pressure relief valves are preset to discharge at a set pressure dependant on placement within the circuit. 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.

2. 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

4. Relief valves that have been found to have discharged refrigerant should be replaced as positive sealing after

discharge is not guaranteed.

5. During maintenance checks a leak test should be carried out in case of seeping occurring.

Pressure Relief Valve Testing and Replacement

Inspect the valves and Replace regularly as per the PED and relevant regulations

Transducers that incorporate Schrader depressors will be supplied fitted directly to a port, those without will

include a valve for isolation purposes to allow for maintenance.

Pressure switches – Safety.

Pressure switches fitted to compressor bodies are pre-set cartridge type will NOT be fitted with Schrader valves;

this is to ensure that these safety switches are reacting to a definite pressure that cannot be influenced by

mechanical tolerances.

15 Maximum refrigerant charge

When the unit is pumped down, the receiver must be capable to accommodate all the refrigerant charge (kg)

holding in the system. Also, it is really important to avoid to overcharge the system which can cause issues in

compressor operation and efficiency.

Consindering the above, the estimation of maximum refrigerant charge values are based on ≈80% capacity of the

receiver (assuming that the unit is pumped down from the receiver).