Unit Description
38
Figure 9: Zone 1 Cool and Zone 2 Cool
Zone 1 Cool and Zone 2 Cool
High pressure refrigerant vapor leaves the
compressor and flows through the open CIS to the
condenser where the refrigerant condenses into
high pressure liquid. The liquid refrigerant flows
through the receiver tank into the liquid lines.
The LLS1 is open so some of the refrigerant flows
through the Zone 1 expansion valve into the Zone
1 evaporator. There, liquid refrigerant cools the
Zone 1 evaporator as it evaporates into low
pressure vapor. The refrigerant returns to the
compressor through the SLS1, the suction line,
SLCV1 and the accumulator.
The LLS2 is also open so some of the refrigerant
flows through the Zone 2 expansion valve into the
Zone 2 evaporator. There, liquid refrigerant cools
the Zone 2 evaporator as it evaporates into low
pressure vapor. The refrigerant returns to the
compressor through the SLS2, the second suction
line, the SLCV2 and the accumulator.
Zone 1 Evaporator
1F. Zone 1 Liquid Line Solenoid (LLS1)-Open
2F. Zone 1 Liquid Return Check Valve
(LRCV1)-Closed
3F. Zone 1 Suction Line Check Valve
(SLCV1)-Open
4F. Zone 1 Suction Line Solenoid (SLS1)-Open
5F. Zone 1 Hot Gas Solenoid (HGS1)-Closed
Zone 2 Evaporator
1R. Zone 2 Liquid Line Solenoid (LLS2)-Open
2R. Zone 2 Liquid Return Check Valve
(LRCV2)-Closed
3R. Zone 2 Suction Line Check Valve
(SLCV2)-Open
4R. Zone 2 Suction Line Solenoid (SLS2)-Open
5R. Zone 2 Hot Gas Solenoid (HGS2)-Closed
Condensing Unit
6. Condenser Inlet Solenoid (CIS)-Open
7. Condenser Inlet Check Valve (CICV)-Open
8. Condenser Check Valve (CCV)-Open
9. Purge Valve (PV)-Closed
10. Purge Check Valve (PCV)-Closed
1F
2F
4F
3F
9
6
7
8
3R
5R
4R
2R
1R
5F
10