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INSTALLATION AND SERVICE MANUAL 959R
184981-02
9
Equipment Operation
9.1 The Refrigeration System
(See Figure 9-1.) The compressor
discharges the refrigerant to the con-
denser as a high-temperature, high-
pressure gas. Either by water-cooling or
air-cooling, the gas refrigerant con-
denses to a liquid form. This high pres-
sure liquid flows into the receiver which
serves as the refrigerant reservoir . Upon
leaving the receiver, the refrigerant flows
through the filter drier, sight glass, heat
exchanger and cylinder solenoid valve.
For example, when the cylinder evapora-
tor thermostat calls for cooling, the
cylinder solenoid coil is energized and
the valve opens to permit the flow of
refrigerant to the expansion valve. This
expansion valve controls the flow of
refrigerant in the evaporator in such a
way as to keep practically the entire coil
filled with evaporating refrigerant. The
expansion valve keeps a const ant pres-
sure on the low side of the refrigeration
system.
As the refrigerant in the cylinder evapo-
rator absorbs the heat, it changes to a
low pressure vapor. This vapor goes
through the heat exchanger and absorbs
heat from the high side liquid line in-
creasing the vapor and then is returned
to the low pressure side of the compres-
sor through the suction line, thus com-
pleting the refrigeration cycle.
In water-cooled systems the flow of
cooling water to the condenser is me-
tered by a pressure-controlled regulating
valve. Here, two forces control the size of
the valve opening through which con-
denser water may flow. An adjustable
tension spring tends to keep the valve
closed while a bellows, connected by
tubing to the high-pressure side of the
system, tends to open the valve. When
the refrigeration system begins opera-
tion, the increased pressure caused by
the compressor opens the water regulat-
ing valve and permits water to flow
through the condenser. When the unit
cycles off, the water continues to flow
through the valve until the condensing
pressure has decreased below the valve
setting. (See Specification Chart for
settings.)
