Brochure

Bulletin 30-10 / Page 27
Sporlan Solenoid Valves Application
They are equally suitable for many other less com-
mon forms of refrigerant control. These applications
and other related topics are discussed in the following
section. For applications not covered, consult Sporlan,
Washington, MO.
Liquid Line Service
The primary purpose of a solenoid valve in a refriger-
ant liquid line is to prevent flow into the evaporator
during the off-cycle. On multiple evaporator systems,
a solenoid valve may be used in each of the liquid lines
leading to the individual evaporators.
The application of a liquid line solenoid valve depends
mainly on the method of wiring the valve with the
compressor control circuit. It may be wired so the valve


Line
Voltage
Magnetic
Starter
Thermostat
Solenoid
Valve
Catch-All
Suction Line
Compressor
Liquid Line
Condenser
Receiver
Dual Pressure Control
Figure 7
Figure 8
Condenser
Receiver
Line
Voltage
Magnetic
Starter
Catch-All
Suction Line
Compressor
Liquid Line
Thermostat
Dual
Pressure
Control
Water
Solenoid
Control
Solenoid Valve
TEV
When the thermostat again calls for refrigeration, the
solenoid valve opens - causing the evaporator pressure
to rise and the compressor to start. This arrangement
can be used on either single or multiple evaporators.
Suction Line Service
There are several applications, particularly on suction
lines, where pressure drops in excess of 2 psi cannot
be tolerated. Therefore, only valves which are capable
of opening at very low pressure drops are suitable for
this type of use.
All Sporlan refrigeration solenoid valves, are ideally
suited for these special applications. They are capable
of opening full at pressure drops of 1.0 psi.
For suction line capacities refer to the Tables
on Pages 6 and 7.
High Temperature Applications
Any valves using the MKC-1, OMKC-1, MKC-2 or
OMKC-2 coil may be used on fluids or gases whose
temperature does not exceed 240°F, while the valve
ambient is 120°F.
NOTE: The MKC-1, OMKC-1, MKC-2 and
OMKC-2 molded coils are satisfactory
for use with hot gas bypass and hot
gas defrost applications. Their unique
molded rib surface radiates heat very
rapidly and therefore a high tempera-
ture coil is not required in these two
sizes.
Gas Defrost Service
is energized only when the compressor is running. This
type of application is illustrated in Figure 7.
Another application known as pump down control,
uses a thermostat to control the solenoid valve. See
Figure 8 for a wiring and valve location schematic.
When the thermostat is satisfied, the valve closes and
the compressor continues to run until a substantial por-
tion of the refrigerant has been pumped from the evap-
orator. A low pressure cutout control is used to stop the
compressor at a pre-determined evaporator pressure.