9
2-9
62-11039
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1. Solenoid Valve
2. Valve Stem
3. Gas Bypass Port
4. Spring Guide
5. Spring
6. Piston
7. Piston Bypass Valve
8. Bleed Orifice
9. Strainer
10. Suction Manifold
11. Cylinder Discharge Valve
12. Valve Plate
13. Cylinder Suction Valve
14. Discharge Piston Check Valve Assembly
15. Discharge Manifold
Figure 2-6. Compressor Cylinder Head Loaded
c. Loaded Operation
Discharge pressure bleeds from the discharge manifold
(Figure 2-6, item 15) through the strainer (9) and (8)
bleed orifice to the solenoid valve stem (2) chamber and
the back of the piston bypass valve (7).
With the solenoid valve (1) de-energized the solenoid
valve stem will close the gas bypass port (3).
Refrigerant pressure will overcome the bypass valve
spring (5) tension and force the piston (6) forward
closing the gas bypass from the discharge manifold to
the suction manifold (10).
Cylinder discharge pressure will force open the
discharge piston check valve assembly (14).
Refrigerant gas will pass into the compressor discharge
manifold.
The loaded cylinder bank will continue to operate fully
loaded until the solenoid valve control device is
energized and the gas bypass port is opened. Refer to
Section 4.4.7 for more information on Loaded
Operation.
2.3.4 Filter Drier
The drier is a cylinder shell containing a drying agent
and screen. It is installed in the liquid line and functions
to keep the system clean and remove moisture from the
refrigerant.
2.3.5 Receiver
Liquid refrigerant from the condenser drains into the
receiver. The receiver serves as a liquid reservoir when
there are surges due to load changes in the system; as a
storagespace when pumping down the system and as a
liquid seal against the entrance of refrigerant gas into
the liquid line.
The receiver is provided with two bull’s--eye sight
glasses, for the observation of liquid level, and a pres-
sure relief valve.
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