AUTOSURGE AND BY-PASS VALVES
The A9B Valve needs to be working properly
for the Autosurge Valve to function during
Koolgas Defrost.
The Autosurge directs the flow of refrigerant
either through the Receiver (Flow Through), or
around the Receiver (Surge) in response to
ambient subcooling obtained in the condenser.
Note: Both the Valve's sensing bulb and its equal-
izer line are located upstream of the Flooding
Valve.
The Autosurge Valve reacts to the condensing
pressure through its equalizer line, and to the
temperature of the liquid refrigerant returning
from the Condenser through a bulb mounted on
the Liquid Return Line up stream of the Flooding
Valve. When the refrigerant temperature returning
from the condenser drops below its condensing
temperature, the system has ambient subcooling.
The valve is factory set at 10Þ F of subcooling
and is
not
field adjustable.
(Note: A thermostat and solenoid valve are used
to deactivate surge operation when the outside
temperature falls to 40-45 deg F.)
CONTROL VALVES
September 1, 1997
6 - 12
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Figure 6-15 — Autosurge Cycle
Condenser
MS
Discharge Manifold
Turba-
Shed
Flooding
Valve A-8
High Pressure Hot Vapor
High Pressure Warm Liquid
High Pressure Warm Vapor
Cut Away Not Shown – Empty
A9B
Valve
BP
High Pressure Pilot Line
Receiver
Autosurge
Valve
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