62-11637
2–8
Figure 2.6 Compressor Cylinder Head Loaded
c. Loaded Operation
With the solenoid valve (
) de-energized the
solenoid valve stem will close the gas bypass port.
Pressure from the discharge manifold through the
strainer and bleed orifice will build behind the piston.
This increased pressure will overcome the bypass
valve spring tension and force the piston forward clos-
ing the gas bypass from the discharge manifold to the
suction manifold.
Cylinder discharge pressure will force the discharge
check valve assembly open. Refrigerant gas will then
flow into the compressor discharge manifold.
The loaded cylinder bank will continue to operate fully
loaded until the solenoid valve is energized and the
gas bypass port is opened.
2.3.8
Compressor Switches, Transducers and
Sensors
a. Compressor Discharge Pressure Transducer
(CDP)
The CDP provides a signal to the control system equiv-
alent to pressure leaving the compressor. The reading
is displayed, recorded in the DataLink data recorder
and used to control the refrigeration system. It is
located on the compressor center head.
b. Compressor Suction Pressure Transducer (CSP)
The CSP provides a signal to the control system equiv-
alent to pressure entering the compressor cylinders.
The reading is displayed, recorded in the DataLink data
recorder and used to control the refrigeration system. It
is located in the suction line, just above the suction ser-
vice valve.
c. High Pressure Switch (HPS)
The HPS is normally closed and opens on pressure
rise to signal to the control system to shutdown the
engine if the discharge pressure rises above the switch
setting. It is located on the compressor center head.
d. Compressor Discharge Temperature Sensor
(CDT)
The CDT is a thermistor type sensor that provides a
signal to the control system equivalent to the tempera-
ture of the gas leaving the compressor. The reading is
displayed, recorded in the DataLink data recorder and
used to control the refrigeration system. It is located on
the compressor center head.
e. Compressor Suction Temperature Sensor (CST)
The CST is a thermistor type sensor that provides a
signal to the control system equivalent to the tempera-
ture of the gas leaving the heat exchanger and entering
the compressor. The reading is displayed, recorded in
the DataLink data recorder and used to control the
refrigeration system. It is located on the heat
exchanger outlet to suction vibrasorber line.
Solenoid
Valve
Valve Stem
Gas Bypass Port
Spring Guide
Spring
Piston
Bypass Valve
Cylinder Discharge Valve
Suction
Manifold
Valve Plate
Cylinder Suction Valve
Bleed Orifice
Strainer
Discharge Manifold
Discharge Check
Valve Assembly
Summary of Contents for Transicold X4 7300
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