Manitowoc Indigo Series, Technician'S Handbook

Page: 104 / 270

104 Part Number STH025 02/12
REMOTE CONDENSER
Single Evaporator Models
NOTE:
The power button must be depressed and the
water curtain/ice dampers must be in place on the
evaporator before the ice machine will start.
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.
2. Refrigeration System Start-Up
The harvest valve, air pump and harvest pressure
regulating (HPR) solenoid valves energize to equalize
high and low side refrigeration pressure.
After 5 seconds the liquid line solenoid valve
energizes and the contactor energizes the compressor
and condenser fan motor.
Freeze Sequence
3. Prechill
The compressor is on for 30 seconds (60 seconds
initial cycle) prior to water flow, to prechill the
evaporator. The water fill valve is also energized and
will remain on until water completes the water level
probe circuit.
4. Freeze
The water pump(s) energizes and water flows over the
evaporator. After water contacts the water level probe
the water fill valve de-energizes. The control board will
automatically cycle the water fill valve within the 6
minute water fill time limit. The valve energizes once in
the pre-chill and up to twice in the freeze cycle.
The freeze cycle continues until the six minute freeze
lock expires and enough ice has formed to send a
signal from the ice thickness probe to the control
board.