FLOODING VA LVE AND RECEIVER
PRESSURE REGULATING VA LV E
The Flooding Valve and the Receiver Pressure
Regulating Valve work together—the opera-
tion of one affects the operation of the other.
The Flooding Valve responds to upstream
pressure from the Condenser. The Receiver
Pressure Regulating Valve responds to down-
stream pressure in the Receiver.
The Pressure Regulator Valve (A9 Va l v e )
responds to Receiver pressure. If the Receiver
pressure drops below its set point the A 9
Valve opens, directing Hot High Pressure
Vapor to the Receiver.
The Flooding Valve (A8) maintains head
pressure in low ambient conditions by reduc-
ing the available condensing area. Restricting
liquid refrigerant flow from the Condenser,
the Flooding Valve prevents the liquid
refrigerant from leaving the Condenser as fast
as it is forming, so the Condenser floods with
its own condensate.
A8 Valve Operation
Upstream Pressure ➀ from the condenser
must be sufficient to hold Diaphragm ➁ o ff
Valve Port ➂ so main Valve Chamber ➃ stays
filled and holds Main Valve ➄ open. W h e n
upstream pressure falls below A d j u s t m e n t
Spring ➅ set point, the valve port closes, the
main Valve Chamber ➃ empties through the
bleed port—closing the main valve. (
1
⁄2 Turn =
35 psig change.)
Troubleshooting
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
CONTROLVALVES Revised August 1, 1996
7 - 10
Malfunction Cause Action
Fails to Open Set too high Reduce spring tension
Dirt blocking Valve Port Clean or replace
Diaphragm dirty or misaligned Clean, replace or align
Fails to close Set too low Increase spring tension
Dirt in bleed port Clean or replace
Installed backwards Re-install with direction of flow
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