Basic Component Layout; Mechanical Safety Of The System - Daikin HUBBARD HCU2040PXB1 Installation, Commissioning And Maintenance Manual

11. Basic com ponent layout
12. M echanical Safety of the system
Pressure relief valves and pressure switches are installed on the unit accordingly to EN 378. Pressure relief valves
are rated as below:
Max Allowable Pressures (PS):
• High Side (Compressor discharge)........................................... Rated 120 bar
• Intermediate Pressure (Liquid receiver)................................... Rated 90 bar
Max Allowable Temperatures (TS): -45°C to +130°C
All the safety valve discharge vents on the condensing units are facing downwards in the compartment behind the
gas cooler fan.
• 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.
Copyright HPL March 2021
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P4367 Rev 01