The Alco Main Liquid Line Solenoid Va l v e
goes into differential mode when the coil is de-
e n e r gized or fails. Upstream liquid ➀ is forced
through the modulating valve ➁ when the
upstream pressure exceeds downstream pres-
sure ➄ plus the spring pressure ➃.
In refrigeration mode, the solenoid valve ➂ i s
held open allowing flow around the modulating
valve ➁.
Differential Mode Quick Test
1. Connect pressure gauges up- and down-
stream of the valve.
2. All branches on the rack must be in refrig-
eration 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.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
7 - 5
Downstream pressure
+ spring pressure
= upstream pressure.
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