Manitowoc UG080A - Freeze Cycle Discharge Pressure Low Checklist

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FREEZE CYCLE DISCHARGE PRESSURE LOW

CHECKLIST

Improper Installation

• Refer to “Installation/Visual Inspection Checklist”

Improper Refrigerant Charge

• Undercharged

• Wrong type of refrigerant

Other

• High side refrigerant lines/component restricted

(before mid-condenser)

NOTE:

Do not limit your diagnosis to only the items

listed in the checklists.

Main Page

Default Chapter7
- Table of Contents7
Table of Contents11
General Information11
Model Numbers11
Installation13
Location of Ice Machine13
- Water Service/Drains14
- Electrical Requirements15
- Electrical Specifications16
- Power Consumption - Kwh Per 24 Hours17
- Ice Machine Heat of Rejection18
Component Identification19
- Component Removal21
- Spray Bar25
Maintenance27
- Cleaning & Sanitizing Procedure28
Operation33
Sequence of Operation33
- Harvest Cycle34
- Ice Cube Thickness Check35
- Cube Shape37
Troubleshooting39
All Models39
- Ice Machine will Not Run39
- Compressor Won't Run40
- Compressor Electrical Diagnostics41
- Diagnosing Start Components43
- Water Pump Won't Run44
- Hot Gas Valve Won't Energize44
- Water Inlet Valve Won't Energize44
- Ice Machine Prematurely Harvests45
- Ce Machine will Not Harvest46
- Evaporator Thermostat47
Water System Checklist54
Ice Production Check55
Analyzing Discharge Pressure56
- Discharge Pressure High Checklist57
- Freeze Cycle Discharge Pressure Low Checklist58
Analyzing Suction Pressure59
- Suction Pressure High Checklist61
- Suction Pressure Low Checklist62
Discharge Line Temperature Analysis63
Component Check Procedures65
- On/Off/Wash-Fill Toggle Switch65
- Bin Thermistor (T3)66
- SUMP WATER Thermistor (T1)& LIQUID LINE Thermistor(T2)68
- High Pressure Cutout (HPCO) Control75
- Hot Gas Valve76
Refrigerant81
- Recover/Evacuation/Charging81
- System Contamination Cleanup84
- Mild System Contamination Cleanup86
- Severe System Contamination Cleanup Procedure87
- Filter-Driers89
- Total System Refrigeration Charge90
Cycle Times/24 Hour Ice Production and Refrigerant Pressure Charts91
- Cube92
- Ug18A Self-Contained Air-Cooled - Standard Cube (Continued)93
- Ug18A Self-Contained Air-Cooled - Standard Cube (Continued)94
  - Cube95
- UG020A Self-Contained Air-Cooled - Standard Cube (Continued)96
- UG020A Self-Contained Air-Cooled - Standard Cube (Continued)97
- Ug030A-251 Self-Contained Air-Cooled - Standard Cube98
- Ug030A-251 Self-Contained Air-Cooled - Standard Cube99
- UG030A-251 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)100
- Dard Cube (Continued)100
- Ug030A-261 Self-Contained Air-Cooled - Standard Cube101
- Ug030A-261 Self-Contained Air-Cooled - Standard Cube102
  - Dard Cube (Continued)103
- Ug030A-161 Self-Contained Air-Cooled - Standard Cube104
- Ug030A-161 Self-Contained Air-Cooled - Standard Cube105
- UG030A-161 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)106
- Dard Cube (Continued)106
- UG030W Self-Contained WATER--Cooled107
  - Standard Cube107
- UG030W Self-Contained WATER--Cooled108
  - Standard Cube108
- UG030W Self-Contained WATER--Cooled109
  - Standard Cube (Continued)109
  - Ug040A-251 Self-Contained Air-Cooled - Standard Cube110
  - UG040A-251 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)111
  - Dard Cube (Continued)111
  - UG040A-251 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)112
  - Dard Cube (Continued)112
- Ug040A-261 Self-Contained Air-Cooled - Standard Cube113
- UG040A-261 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)114
- Dard Cube (Continued)114
- UG040A-261 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)115
  - Dard Cube (Continued)115
  - Ug050A-251 Self-Contained Air-Cooled - Standard Cube116
  - Dard Cube (Continued)117
  - UG050A-251 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)117
- UG050A-251 SELF-CONTAINED AIR-COOLED - STANDARD CUBE (Continued)118
- Dard Cube (Continued)118
- UG050W Self-Contained Water-Cooled119
- UG050W Self-Contained Water-Cooled120
- UG050W Self-Contained Water-Cooled121
- UG065AG-251G Self-Contained Air-Cooled - Standard Cube122
- UG065 Self-Contained Air-Cooled - Standard Cube (Continued)123
- UG065 Self-Contained Air-Cooled - Standard Cube (Continued)124
- UG080A Self-Contained Air-Cooled - Standard Cube125
- UG080A Self-Contained Air-Cooled - Standard Cube (Continued)126
  - Cube (Continued)127
Diagrams129
Wiring Diagram129
- UG18/UG20 Air-Cooled129
- UG30/UG50/UG65 Air-Cooled130
- UG30/UG50 Water-Cooled132
Tubing Schematics133
- Ug18/Ug20/Ug30/Ug40/Ug65 Tubing Schematic133
- UG50/UG80 Tubing Schematic134

Manitowoc UG080A - Freeze Cycle Discharge Pressure Low Checklist

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