Section 7 Refrigeration System
Part No. 80-1100-3 7-3
REMOTE MODELS
Figure 7-3. Remote Pre-Chill and Freeze Cycle (Models Q450/Q600/Q800/Q1000)
Prechill Refrigeration Sequence
No water flows over the evaporator during the prechill.
The refrigerant absorbs heat (picked up during the
harvest cycle) from the evaporators. The suction
pressure decreases during the prechill.
Freeze Cycle Refrigeration Sequence
The refrigerant absorbs heat from the water running over
the evaporator surface. The suction pressure gradually
drops as ice forms.
The headmaster control valve maintains discharge
pressure in ambient temperatures below 70
°F (21.1°C).
(See “Headmaster Control Valve” on Page 7-30.)
X
X
HEAT
EXCHANGER
EVAPORATOR
SOLENOID
LINE
LIQUID
CHECK VALVE
SERVICE
RECEIVER
CONDENSER
REMOTE
COMPRESSOR
RECEIVER
EXPANSION VALVE
HARVEST SOLENOID VALVE
VALVE
HARVEST PRESSURE
REGULATING VALVE
H.P.R. SOLENOID
VALVE
VALVE
CHECK VALVE
DRIER
STRAINER
HEAD
PRESSURE
CONTROL
VALVE
B
R
C
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