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5. Unsweat/Debraze pipe connections below.
GCU2040PXB1 :
For Model
6. Undo 3 off M8 screws using 13mm socket.
7. Rotate compressor so connections are clear of pipework and lift out, when fitting new compressor ensure metal
sleeves are fitted in the rubber compressor feet prior to bolting the compressor down to the base plate.
8. Rebraze pipe lines to the compressor ports then ensure pipe brackets are tightened.
14.5 P ressure R elief 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
pressure relief valve is mounted.
3. During installation of the pack the pipework from the pressure relief valves should be run out of the building and
vented safely into the atmosphere. No restriction such as pipe caps Etc. should be left in or on the pipework
leading from the pressure relief valves to the outside as any back pressure will change the relief set point of the
valves. Pipe-work should be sized to provide correct discharge flow rate for system design.
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
Copyright HPL March 2021
Page 22 of 172
P4114S Rev 03
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