Manitowoc MD0420A - Page 10

10 Part Number 040005626 5/17
OPERATION
Ice Making Sequence of Operation . . . . 41
Control Board Timers . . . . . . . . . . . . 42
Safety Limits . . . . . . . . . . . . . . . . . . . . 43
Energized Parts Chart . . . . . . . . . . . . 45
Operational Checks . . . . . . . . . . . . . . . . . 47
Ice Thickness Check . . . . . . . . . . . . . 47
TROUBLESHOOTING
Control Board Test Mode . . . . . . . . . . . . 49
Diagnosing an Ice Machine that Will Not Run
50
Ice Machine Does Not Cycle Into Harvest
when Water Loses Contact with the Harvest
Float Switch . . . . . . . . . . . . . . . . . . . . . . . 51
Ice Machine Cycles Into Harvest Before Water
loses Contact with the Harvest Float Switch
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Ice Production Check . . . . . . . . . . . . . . . 54
Installation/Visual Inspection Checklist 55
Water System Checklist . . . . . . . . . . . . . 56
Ice Formation Pattern . . . . . . . . . . . . . . . 57
Safety Limits . . . . . . . . . . . . . . . . . . . . 60
Analyzing Discharge Pressure . . . . . . . . 67
Analyzing Suction Pressure . . . . . . . . . . 69
Harvest Valve . . . . . . . . . . . . . . . . . . . . . . 73
Comparing Evaporator Inlet/Outlet
Temperatures . . . . . . . . . . . . . . . . . . . . . . 77
Discharge Line Temperature Analysis . 78
Refrigeration Component Diagnostics . 80
Final Analysis . . . . . . . . . . . . . . . . . . . 82
Refrigeration Component Diagnostic Chart
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83