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OPSS Function:
• The OPSS differential oil pressure switch consists of two
parts: a sensor unit and an electronic unit. The electronic
unit can easily be disconnected from the sensor without
opening the oil/refrigeration circuit.
• The OPSS serves to monitor the oil differential pressure
of the oil pumps in refrigeration compressors. For this,
a
screw-in sensor is mounted directly to the pump housing
and measures both the compressor's suction and oil
pump pressure simultaneously. The screw-in sensor is
thereby connected, by the sensor block, to the suction
and high pressure side of the oil pump. Thus supplemen-
tary pipe connections are not needed.
• The OPSS electrical unit is fastened by a coupling ring
to the screw-in sensor and can be removed without open-
ing the oil/refrigeration circuit (not in direct contact with
the oil circuit).
1.) OPSS Operation:
• The OPSS is a dual power low oil DP switch 120/
240Vac (Blue/Brown wires).
Electrical Unit
(Carlyle Part# 06DA509570)
Oil Pump pressure inlet
Coupling Ring
Oring (maintains oil pressure DP)
Oil Sump Pressure inlet
Screw-in Sensor
(Carlyle Part# 06DA509571)
Fig. 16 — Oil Pressure Safety Switch
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