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TRG-TRC005-EN 35
period five
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notes
One common use of a solenoid valve is to control the flow of liquid refrigerant
to multiple sections of the evaporator. In this application, a valve is installed in
the liquid line, upstream of the expansion valve for each individually controlled
section of the evaporator coil.
Using the example of a face-split evaporator coil, at lower loads a solenoid
valve may be used to shut off the flow of liquid refrigerant to the top section of
the coil. A portion of the air passes through the active lower section and is
cooled, while the rest of the air passes through the inactive top section and
remains unconditioned. The two airstreams mix downstream of the coil. At
higher loads, both sections of the coil are activated.
Another common use of a solenoid valve is to enable system pump-down and
prevent the refrigerant from migrating through the system when the
compressor is shut off. In this application, a single solenoid valve is installed in
the liquid line, upstream of all expansion valves.
Solenoid Valve
finned-tube
finned-tube
evaporator
evaporator
solenoid
solenoid
valves
valves
expansion
expansion
valve
valve
Figure 51
Solenoid Valve
solenoid
solenoid
valve
valve
expansion
expansion
valve
valve
evaporator
evaporator
liquid line
liquid line
condenser
condenser
compressor
compressor
discharge
discharge
line
line
suction
suction
line
line
Figure 52