Troubleshooting EPR Valves
KOOLGAS VALVES
Koolgas valving is piped in one of two ways.
With a stop suction EPR, a simple 2-way
solenoid valve is used. Without, a 3-way
solenoid valve is used. Unless there is damage
to the valve body itself, both the 2-way and
3-way valve may be disassembled and
repaired in the field.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
CONTROLVALVES Revised August 1, 1996
7 - 2
Malfunction Cause Action
Fails to Open Dirt holding pilot port open Disassemble and clean
Solenoid not energized
-bad solenoid Replace solenoid
-circuit open find and repair open
-stuck in defrost mode correct defrost clock problem
Fails to close High pressure inlet strainer plugged Clean or replace
High pressure line pinched, shut off Clean or replace. If oil filled, repipe
or plugged so high pressure line is not an oil trap
Sleeve or piston scored, allowing Replace
high pressure leak from piston
chamber
Dirt in piston chamber, causing drag Clean or replace
High pressure supply lower than
defrost vapor pressure R e p i p e
(Sporlan) Faulty T-seal or Gasket R e p l a c e
Does not Low high pressure supply, 50 psig Increase pressure supply
R e g u l a t e or more required in differential between
Te m p e r a t u r e high pressure and down stream suction
Condensation in long high pressure line Insulate and/or relocate to higher pressure
s o u r c e
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