Manitowoc J250 - Page 148

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Section 7 Refrigeration System

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Table of Contents

Default Chapter2
- Safety Notices2
- Table of Contents3
Section 1 - Warranty9
Coverage9
Section 2 - Installation References11
- (Refer to Installation Manual for Complete Installation Guidelines) Dimensions Ice Machines11
  - Ice Storage Bins13
  - Remote Condensers15
Location of Ice Machine16
Heat of Rejection16
Electrical Fuse Size/Circuit Ampacity17
Electrical Wiring Connections19
- Self-Contained Electrical Connections19
- Remote Electrical Connections20
Water Connections and Drains21
Cooling Tower Applications (Water-Cooled Models)22
Remote Condenser/Line Set Installation23
- Remote Ice Machines Refrigerant Charge23
- Routing Line Sets24
- Calculating Remote Condenser Installation Distances25
Usage with Non-Manitowoc Multi-Circuit Condensers27
- Warranty27
- Line Set Routing and Sizing27
- Head Pressure Control Valve27
- Fan Motor27
- Internal Condenser Volume28
- Condenser ∆T28
- Refrigerant Charge28
- Quick-Connect Fittings28
Section 3 - Maintenance30
Component Identification30
Operational Checks31
- Water Level Check31
- Ice Thickness Check31
Cleaning the Condenser32
- Air-Cooled Condenser (Self-Contained and Remote Models)32
- Water-Cooled Condenser and Water Regulating Valve33
Interior Cleaning and Sanitizing General34
- Cleaning Procedure34
- Sanitizing Procedure34
- Procedure to Cancela Self-Cleaning or Sanitizing Cycle after It Has Started35
- Removal of Parts for Cleaning/Sanitizing37
Water Treatment/Filtration43
Removal from Service/Winterization General44
- Self-Contained Air-Cooled Ice Machines44
- Water-Cooled Ice Machines44
- Remote Ice Machines44
Section 5 - Water System Ice Making Sequence of Operation46
Section 4 - Ice Machine Sequence of Operation46
Self-Contained Air- and Water-Cooled46
Initial Start-Up or Start-Up after Automatic Shut-Off46
Freeze Cycle47
Harvest Cycle47
Automatic Shut-Off47
Section 6 - Electrical System52
Energized Parts Charts52
- Self-Contained Air- and Water-Cooled Models52
- Remote Models53
Wiring Diagram Sequence of Operation54
- Self-Contained Models54
- Electrical System55
- Remote Models61
Wiring Diagrams68
- Wiring Diagram Legend68
- Old Style Self-Contained - J200/J250/J320 - 1 Phase69
- Old Style Self-Contained - J420/J450/J600/J800/J1000 - 1 Phase70
- Old Style Self-Contained - J800/J1000 - 3 Phase71
- Old Style Self-Contained - J1300/J1800 - 1 Phase72
- Old Style Self-Contained - J1300/J1800 - 3 Phase73
- Old Style Remote - J450/J600/J800/J1000 - 1 Phase74
- Old Style Remote - J800/J1000 - 3 Phase75
- Old Style Remote - J1300/J1800 - 1 Phase76
- Old Style Remote - J1300/J1800 - 3 Phase77
- New Style Self-Contained - J200/J250/J320 - 1 Phase78
- New Style Self-Contained - J420/J450/J600/J800/J1000 - 1 Phase79
- New Style Self-Contained - J800/J1000 - 3 Phase80
- New Style Self-Contained - J1300/J1800 - 1 Phase81
- New Style Self-Contained - J1300/J1800 - 3 Phase82
- New Style Remote - J450/J600/J800/J1000 - 1 Phase83
- New Style Remote - J800/J1000 - 3 Phase84
- New Style Remote - J1300/J1800 - 1 Phase85
- New Style Remote - J1300/J1800 - 3 Phase86
Component Specifications and Diagnostics87
- Fuses87
- Bin Switch87
- Compressor Electrical Diagnostics89
- PTCR Diagnostics90
- Discharge Line Thermistor94
- Ice/Off/Clean Toggle Switch95
- Control Board Relays96
- Electronic Control Board (Old Style)97
- Electronic Control Board (New Style)98
Section 6 - Electrical System (Cont.)87
Ice Thickness Probe (Harvest Initiation) General101
- How the Probe Works101
- Freeze Time Lock-In Feature101
- Maximum Freeze Time101
- Installation of New Probe on Old Style Control Board101
- Diagnosing Probe Control Circuitry102
  - Ice Machine Cycles into Harvest before Water Contact with Probe102
  - Ice Machine Does Not Cycle into Harvest When Water Contacts Probe103
Diagnosing Ice Machine that will Not Run104
Section 7 - Refrigeration System106
Sequence of Operation SELF-CONTAINED AIR or WATER-COOLED MODELS106
- Remote Models108
- J1300/J1800 Refrigeration Tubing Schematics111
Operational Analysis (Diagnostics) General113
- Before Beginning Service114
- Ice Production Check114
- Installation/Visual Inspection Checklist115
- Water System Checklist115
- Ice Formation Pattern116
- Safety Limits118
- Hot Gas Valve Temperature Check122
- Single Expansion Valve Ice Machines Comparing Evaporator Inlet and Outlet Temperatures123
- Analyzing Discharge Pressure During Freeze or Harvest Cycle Procedure124
  - Freeze Cycle Discharge Pressure High Checklist124
  - Freeze Cycle Discharge Pressure Low Checklist124
- Analyzing Suction Pressure During Freeze Cycle125
- How to Use the Refrigeration System Operational Analysis Tables127
- Refrigeration System Operational Analysis Tables129
- Remotes Only131
  - Harvest Pressure Regulating (H.P.R.) System131
Section 7 - Refrigeration System (Cont.)131
- Headmaster Control Valve133
Pressure Control Specifications and Diagnostics135
- Fan Cycle Control135
- High Pressure Cutout (HPCO) Control135
Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts J200136
- J250137
- J320138
- Operating Pressures139
- J600140
- J800142
- J1000143
- J1300145
- J1800146
Refrigerant Recovery/Evacuating and Recharging149
- Normal Remote Model Procedures151
- System Contamination Cleanup155
- Replacing Pressure Controls Without Removing Refrigerant Charge157
- Filter-Driers159
- Total System Refrigerant Charges159
- Refrigerant Definitions160
- Refrigerant Re-Use Policy161
- HFC Refrigerant Questions and Answers162

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