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Section 7
Sequence of Operation
SELF-CONTAINED WATER -COOLED MODELS
HEAT
EXCHANGER
DRIER
HIGH PRESSURE VAPOR
Prechill Refrigeration Sequence
No water flows over the evaporator during the prechill.
The refrigerant absorbs heat (picked up during the
harvest cycle) from the evaporator. The suction pressure
decreases during the prechill.
Part Number 80-1559-3
Refrigeration System
EXPANSION VALVE
HOT GAS SOLENOID VALVE
COMPRESSOR
RECEIVER
(WATER COOLED ONLY)
HIGH PRESSURE LIQUID
Figure 7-1. Self-Contained Prechill and Freeze Cycle
Section 7
STRAINER
LOW PRESSURE LIQUID
Freeze Cycle Refrigeration Sequence
The refrigerant absorbs heat from water running over the
evaporator surface. The suction pressure gradually
drops as ice forms.
Refrigeration System
EVAPORATOR
X
AIR OR WATER
CONDENSER
LOW PRESSURE VAPOR
SV1569
7-1
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