Pressure Relief Valve - Liquid Receiver; Low-Pressure Safety Control; Figure 33: Pressure Relief Valves With Changeover Valve On Liquid Receiver; Figure 34: Low Side Pressure Transmitter - Emerson Copeland OME-16T Application Manuallines

2.14.5 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 ref rigerant blow-off, this allows f or easy replacement of the relief device without
interruption of unit operation by using the second valve.
Typically, af ter a blow-off event, the relief devices are not 100 % tight anymore. Theref ore,
component replacement after activation is mandatory. Do not keep the pressure relief valve after a
blow-off. When replacing the pressure relief valve follow the instructions in section 5.8 "Pressure
relief valves". The thread connections on the changeover valve and pressure relief valve are
1/2" NPT.

Figure 33: Pressure relief valves with changeover valve on liquid receiver

2.14.6 Low-pressure safety control

As on discharge and liquid sides, a suction pressure transmitter (B1 = AIC1) provides inf ormation
about suction pressure to the system controller. This value is used to evaluate the load requirement
and to protect the unit / system against low pressure on suction side.

Figure 34: Low side pressure transmitter

AGL_Unit_OMTE_CO _EN_Rev01 25
2