Section 7 - Refrigeration System; Sequence Of Operation Self-Contained Air Or Water-Cooled Models - Manitowoc J250 Service Manual

Section 7
Sequence of Operation
SELF-CONTAINED AIR OR WATER-COOLED MODELS
DRIER
HIGH PRESSURE VAPOR
Self-Contained Prechill and Freeze Cycle (Models J250/J320/J420/J450/J600/J800/J1000)
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.
Refrigeration System
HEAT
EXCHANGER
COMPRESSOR
RECEIVER
(WATER COOLED ONLY)
HIGH PRESSURE LIQUID
Section 7
EXPANSION
VALVE
HOT GAS
SOLENOID VALVE
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
AIR OR WATER
CONDENSER
LOW PRESSURE VAPOR
SV1569
7-1