Section 4 Ice Machine Sequence of Operation
4-3
Remote
J450/J600/J800/J1000/J1300/J1800
INITIAL START-UP OR
START-UP AFTER AUTOMATIC SHUT-OFF
1. Water Purge
Before the compressor starts, the water pump and
water dump solenoid are energized for 45 seconds, to
completely purge the ice machine of old water. This
feature ensures that the ice making cycle starts with
fresh water.
The hot gas and harvest pressure regulating (HPR)
solenoid valves also energize during water purge,
although they stay on for an additional 5 seconds (50
seconds total on time) during the initial refrigeration
system start-up.
2. Refrigeration System Start-Up
The compressor and liquid line solenoid valve
energize after the 45 second water purge and remain
on throughout the entire Freeze and Harvest
Sequences. The hot gas valve and HPR solenoid
valves remain on for 5 seconds during initial
compressor start-up and then shut off.
The remote condenser fan motor starts at the same
time the compressor starts and remain on throughout
the entire Freeze and Harvest Sequences. (The
compressor and condenser fan motor are wired
through the contactor, therefore, anytime the
contactor coil is energized, the compressor and fan
motor are on.)
FREEZE SEQUENCE
3. Prechill
The compressor is on for 30 seconds prior to water
flow, to prechill the evaporator.
4. Freeze
The water pump restarts after the 30 second prechill.
An even flow of water is directed across the
evaporator and into each cube cell, where it freezes.
When sufficient ice has formed, the water flow (not
the ice) contacts the ice thickness probe. After
approximately 7 seconds of continual water contact,
the harvest sequence is initiated. The ice machine
cannot initiate a harvest sequence until a 6 minute
freeze lock has been surpassed.
Freeze Sequence (Typical J450 Shown)
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