MAIN LIQUID LINE
SOLENOID VALVES
The Sporlan Main Liquid Line Solenoid Valve goes
into differential mode when the coil is de-energized
or fails. When the Pilot Port
➀
opens, Upstream
pressure
➁
fills the Main Valve Chamber
➂
and
forces the Main Valve towards a closed position.
The downstream pressure
➃
falls to the point that
the Pilot Valve Spring
➄
can not keep the down-
stream outlet closed. The Main Valve Chamber
starts to empty and upstream pressure forces the
main valve towards open.
Differential Mode Quick Test
1. Connect pressure gauges up- and downstream
of the valve.
2. All branches on the rack must be in
refrigeration mode.
3. Disconnect power to Solenoid.
4. Check gauges for differential.
NOTE:
Low refrigerant demand may prevent the
differential from building up to the valve’s real
setting.
CONTROL VALVES
September 1, 1997
6 - 4
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Figure 6-5 — Main Liquid Line Solenoid
4
2
3
1
5
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