Manitowoc MD0420A - Electronic Control Board

Manitowoc MD0420A

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Part Number 040005626 5/17 129

ELECTRONIC CONTROL BOARD

ICE LVL FLT

BIN LEVEL

TEST MODE

HARVEST

SAFETY 1

SAFETY 2

BIN LEVEL

WTR LVL FLT

WTR FLT

ICE FLT

TEST SW

WTR PUMP

COMPRESSOR

WTR DUMP

HARVEST

CLEAN

WATER FILL

FUSE 3.15 A

Table of Contents

Safety Notices3
Table of Contents9
General Information13
- Model Numbers13
- How to Read a Model Number14
- Ice Machine Warranty Information15
  - Commercial Warranty Coverage15
  - Residential Warranty Coverage18
Installation21
- Location of Ice Machine21
- Ice Machine Clearance Requirements22
- Clearance Requirements22
- Ice Machine Heat of Rejection23
- Leveling the Ice Machine23
- Electrical Requirements24
  - Water Service/Drains25
  - Water Supply25
  - Water Inlet Lines25
- Drain Connections26
- Cooling Tower Applications26
- Maintenance29
- Interior Cleaning and Sanitizing29
- General29
- Cleaning and Sanitizing Procedure29
- Toggle Switch Operation30
- Remove Parts for Cleaning34
- Preventative Maintenance Cleaning36
- Ice Machine Inspection37
- Cleaning the Condenser38
- Removal from Service/Winterization39
- Air-Cooled Models39
- Water-Cooled Models39
Ice Making Sequence of Operation41
- Control Board Timers42
- Safety Limits43
- Energized Parts Chart45
Operational Checks47
- Ice Thickness Check47
Troubleshooting49
Control Board Test Mode49
Diagnosing an Ice Machine that will Not Run50
Ice Machine Does Not Cycle into Harvest When Water Loses Contact with the Harvest Float Switch51
Ice Machine Cycles into Harvest before Water Loses Contact with the Harvest Float Switch53
Ice Production Check54
Installation/Visual Inspection Checklist55
Water System Checklist56
Ice Formation Pattern57
Safety Limits60
Analyzing Discharge Pressure67
Analyzing Suction Pressure69
Harvest Valve73
Comparing Evaporator Inlet/Outlet Temperatures77
Discharge Line Temperature Analysis78
Refrigeration Component Diagnostics80
Final Analysis82
Refrigeration Component Diagnostic Chart83
Component Check Procedures87
- Main Fuse87
- Bin Switch88
- Float Switch90
- Compressor Electrical Diagnostics92
- Fan Cycle Control94
- High Pressure Cutout (HPCO) Control95
- Refrigeration Components96
- Refrigerant Recovery/Evacuation104
- Replacing Pressure Controls Without Removing Refrigerant Charge114
- Refrigerant Amount116
- Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts117
- M0420A Self-Contained Air-Cooled118
- M0500A Self-Contained Air-Cooled119
- M0500W Self-Contained Water-Cooled120
- M0700A Self-Contained Air-Cooled121
- M0700W Self-Contained Water-Cooled122
- M1000A Self-Contained Air-Cooled123
- M1000W Self-Contained Water-Cooled124
- M1400A Self-Contained Air-Cooled125
Wiring Diagrams127
- Wiring Diagram Legend127
- M0420,M0500, M0700, M1000 1 PH Self- Contained Air/Water-Cooled128
- Electronic Control Board129
Refrigeration Tubing Schematics130
- Self-Contained Air or Water-Cooled130

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