Manitowoc Q450 - Energized Parts Chart

–17–
Energized Parts Chart
Ice Making
Sequence of
Operation
Control Board Relays Contactor
Length
of Time
1
Water
Pump
2
Water Fill
Valve
3
Harvest
Valve
4
Water
Dump
Valve
5
Contactor
Coil
5A
Compressor
5B
Condenser
Fan Motor
Initial Start-Up 1. Water Purge
On Off On On Off Off Off
45 Seconds
2. Refrigeration
System Start-up
Off On On Off On On
May Cycle
On/Off
5 Seconds
Freeze Sequence 3. Prechill
Off
May Cycle
On/Off
during first
45 sec.
Off Off On On
May Cycle
On/Off
30 Seconds
4. Freeze On
Cycles
On then Off
one more
time
Off Off On On
May Cycle
On/Off
Unit 7 Sec.
Water Contact
w/Ice Thickness Probe