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Table of Contents
Electrical System
Energized Parts Charts
Self-Contained Water-Cooled Models ...........................................................................................................1
Wiring Diagram Sequence of Operation
Self-Contained Models.....................................................................................................................................2
Wiring Diagrams
Wiring Diagram Legend..................................................................................................................................9
Self-Contained - Q1800 - 1 Phase .................................................................................................................10
Component Specifications and Diagnostics
Main Fuse .......................................................................................................................................................11
Bin Switch.......................................................................................................................................................11
Compressor Electrical Diagnostics...............................................................................................................13
PTCR Diagnostics..........................................................................................................................................14
Ice/Off/Clean Toggle Switch .........................................................................................................................17
Control Board Relays ....................................................................................................................................17
Electronic Control Board..............................................................................................................................18
Ice Thickness Probe (Harvest Initiation)
How the Probe Works ...................................................................................................................................20
Harvest/Safety Limit Light ...........................................................................................................................20
Freeze Time Lock-In Feature.......................................................................................................................20
Maximum Freeze Time..................................................................................................................................20
Diagnosing Ice Thickness Control Circuitry
Ice Machine Does Not Cycle Into Harvest When Water Contacts The Ice Thickness Probe..........21
Ice Machine Cycles Into Harvest Before Water Contact With The Ice Thickness Probe ................22
Water Level Control Circuitry
Diagnosing Freeze Cycle Potable Water Level Control Circuitry ...........................................................23
Water Trough Overfilling During The Freeze Cycle ...........................................................................24
Water Will Not Run Into The Sump Trough During The Freeze Cycle ............................................26
Diagnosing Ice Machine That Will Not Run..........................................................................................27