The Twin Receivers act as a vapor trap and
supply the Main Liquid Solenoid with quality
liquid refrigerant. Sufficient liquid, vapor, and
pressure are critical to the operation of the
system. The system maintains these balances in
the Twin Receivers for use as needed.
The Main Liquid Pressure Differential Valve
(MS) functions during Koolgas defrost to
reduce pressure to the Liquid Manifold. This
solenoid operated valve never closes completely
but restricts the liquid line, reducing the
pressure in the Liquid Manifold. The reduced
pressure allows reverse flow of refrigerant
necessary for Koolgas Defrost.
The Liquid Manifold distributes liquid
refrigerant to all Branch Liquid Lines.
The Branch Liquid Line Solenoid Valve (S_)
closes off refrigerant supply to the evaporator,
yet allows back flow of refrigerant into the
Liquid Manifold.
The T E V, located in the merchandiser, meters
liquid refrigerant through its orifice to the low
pressure side of the system where it evaporates
absorbing heat from the coil.
An evaporator pressure regulating valve may be
used to control the evaporator temperature by
preventing the evaporator pressure from
dropping below a set point.
At critical locations along the refrigerant path,
service valves or ball valves allow isolation of
components.
Revised August 1, 1996 P/N 340272A
2 - 5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
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