color change of the indicator disc.
the filter drier must be change ).
Insure correct expansion valve operation.
Compressors and receiver are equipped with ser-
vice valve for refrigeration circuit maintenance.
Each valve has 3 positions :
Compressor or receiver is isolated from the circuit
Refrigerant is in contact with the manifold
arge manifold (Figure 2-13,
item 15) passes through the strainer (9) and bleed ori-
bled away, this pressure would tend to close the piston
(6) against the piston spring (5) pressure.
With the solenoid valve (1)
the gas bypass port (3).
tion in pressure on the piston bypass valve will take
When the pressure behind the piston has been re-
duced sufficiently, the valve spring will force the piston
discharge manifold to the suction manifold.
Discharge pressure in the discharge manifold will
close the discharge piston check valve assembly (14)
isolating the compressor discharge manifold from the
individual cylinder bank manifold.
cylinder bank will continue to operate
until the solenoid valve control device is
and the gas bypass port is closed.
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