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Manitowoc STH042 7/15 - Page 10

Manitowoc STH042 7/15
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10 Part Number STH042 7/15
Operation
Touch Pad Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Bin Full. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Ice Making Sequence of Operation . . . . . . . . . . . 50
Control Board Timers . . . . . . . . . . . . . . . . . . . . . . 52
Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Energized Parts Chart. . . . . . . . . . . . . . . . . . . . . . 55
Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . 57
Ice Thickness Adjustment. . . . . . . . . . . . . . . . . . 57
Troubleshooting
Control Board Test Mode. . . . . . . . . . . . . . . . . . . . . . 59
Operating Ice Machine with Bin and Touch Pad
Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Diagnosing an Ice Machine that Will Not Run . 60
Ice Machine Does Not Cycle Into Harvest when
Water Loses Contact with the Harvest Float
Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Ice Machine Cycles Into Harvest Before Water
Loses Contact with the Harvest Float Switch. . 63
Ice Production Check . . . . . . . . . . . . . . . . . . . . . . . . . 65
Installation/Visual Inspection Checklist . . . . . . 67
Water System Checklist . . . . . . . . . . . . . . . . . . . . . . . 68
Ice Formation Pattern. . . . . . . . . . . . . . . . . . . . . . . . . 69
Safety Limit Feature . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Analyzing Discharge Pressure . . . . . . . . . . . . . . . . 78
Analyzing Suction Pressure . . . . . . . . . . . . . . . . . . 80
Harvest Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Comparing Evaporator Inlet/Outlet
Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Discharge Line Temperature Analysis. . . . . . . . . 89
Refrigeration Component Diagnostics. . . . . . . . 91
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Final Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Refrigeration Component Diagnostic Chart 94

Table of Contents

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