Emerson Copeland EazyCool OME-4MTL-09X, Инструкции по применению

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C6.1.11/0718-0619/E 31
Figure 41: Pressure transmitters in the CO
2
unit
2.12.4 Pressure relief valve
– High-pressure side
A 120-bar pressure relief valve is installed in the gas cooler outlet. This valve protects the high-
pressure side including the gas cooler. In case of blocked HPV the high-pressure cut-out will switch
the compressor off before the pressure relief valve opens.
The pressure relief valve will reach 100% of blow-off capacity when the maximum allowable pressure
Ps of the compressor is exceeded by 10% (opening at 1.0 x Ps, max capacity at 1.1 x Ps).
Figure 42: Pressure relief valve on high-pressure side
2.12.5 Pressure relief valve
– Liquid receiver
There are two pressure relief valves (90 bar) on the liquid receiver, connected on a changeover
valve. In case of refrigerant blow-off, this allows for easy replacement of the relief device without
interruption of unit operation by using the second valve.
Typically, after a blow-off event, the relief devices are not 100% tight anymore. Therefore component
exchange after activation is recommended. The thread connections on the changeover valve and
pressure relief valve are M24x1.5.