Koolaire KD0172A, Technician'S Handbook

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10 Part Number STH047 5/16
Maintenance
Ice Machine Inspection . . . . . . . . . . . . . . . . . . . . 29
Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Cleaning the Condenser . . . . . . . . . . . . . . . . . . . 29
Interior Cleaning and Sanitizing . . . . . . . . . . . . 31
Removal from Service/Winterization
. . . . . . . . . 44
Operation
Initial Start-up or Start-up After Automatic
Shut-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Freeze Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Harvest Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 48
Automatic Shut-off . . . . . . . . . . . . . . . . . . . . . . . . 48
Energized Parts Chart . . . . . . . . . . . . . . . . . . . . . . 49
Operational Checks
. . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Troubleshooting
Diagnosing an Ice Machine that Will Not Run . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Diagnosing Ice Thickness Control Circuitry . 55
Ice Production Check . . . . . . . . . . . . . . . . . . . . . . 58
Installation and Visual Inspection Checklist . 60
Water System Checklist . . . . . . . . . . . . . . . . . . . . 61
Ice Formation Pattern . . . . . . . . . . . . . . . . . . . . . . 62
Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . . 64
Analyzing Discharge Pressure . . . . . . . . . . . . . 71
Analyzing Suction Pressure . . . . . . . . . . . . . . . . 73
Harvest Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Comparing Evaporator Inlet/Outlet
Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Discharge Line Temperature Analysis . . . . . . . 82
Refrigeration Component Diagnostic Chart 84
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Final Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Refrigeration Component Diagnostic Chart 87
Ice Quality Is Poor — Cubes are Shallow,
Incomplete or White . . . . . . . . . . . . . . . . . . . . . . . 90
Freeze Cycle Is Long, Low Ice Production . . . 91
Ice Machine Runs and No Ice Is Produced . . . 92