Discharge Pressure Regulator Valve; Figure 55: Discharge Pressure Regulator Valve Assembly - Thermo King TS-200 Manual

Discharge Pressure Regulator
Valve
This unit is equipped with a discharge pressure
regulator valve, which is located in the hot gas
line between the hot gas valve and the evaporator
coil distributor head. The discharge pressure
regulator valve maintains the compressor
discharge pressure at 340 to 400 psig (2344 to
2758 kPa) during heat and defrost operation.
These higher discharge pressures create higher
discharge temperatures, resulting in enhanced
heating capabilities.
The compressor discharge pressure is sensed at
the equalizer line on the valve. The valve dome is
pre-charged with nitrogen at a pressure of
325 psig (2241 kPa) at 70 F (21 C). The valve
opens and closes as the discharge pressure varies
to maintain the discharge pressure between 340
and 400 psig (2344 and 2758 kPa). The arrow on
the valve indicates the direction of flow.
The discharge pressure regulator valve is not
repairable and must be replaced as an assembly.
CAUTION: Before removing the valve,
cut the crimped charging line on the dome
to release the pressurized nitrogen. This
will allow the valve to open completely and
equalize the refrigerant pressures before
the refrigeration system is opened.
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ARA033
1. Equalizer Line
2. Charging Line
3. Outlet
4. Inlet
Figure 55: Discharge Pressure Regulator Valve
Assembly
Refrigeration Maintenance
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