ii
Adding Refrigerant.............................................................................................................................................. 5-3
Chapter 6 Electrical Controls and Their Functions ..................................................................................6-1
Allen Bradley PLC with Touch Screen HMI ......................................................................................................... 6-6
HMI Main Menu ................................................................................................................................................. 6-6
For Optionally Supplied HFOPAK50 Remote High Sides ................................................................................ 6-8
HMI Primary Submenus...................................................................................................................................... 6-8
HMI Home Screen............................................................................................................................................. 6-13
For Optionally Supplied HFOPAK50 Remote High Sides .............................................................................. 6-15
HMI Detailed Screens ....................................................................................................................................... 6-16
Control Panel Details........................................................................................................................................ 6-31
Chapter 7 Maintenance ........................................................................................................................7-1
Cleaning .............................................................................................................................................................. 7-1
Water Distributors.......................................................................................................................................... 7-4
Water Tank..................................................................................................................................................... 7-6
Freezer Cover ................................................................................................................................................. 7-6
Water-Cooled Condensers ............................................................................................................................. 7-6
Chemical Cleaning .......................................................................................................................................... 7-7
Mechanical Cleaning ...................................................................................................................................... 7-8
Lubrication of the Cutter Motor Gear Reducer.................................................................................................. 7-9
Preventive Maintenance .................................................................................................................................. 7-10
Daily Checklist............................................................................................................................................... 7-10
Weekly Checklist........................................................................................................................................... 7-10
Monthly or Yearly Checklist.......................................................................................................................... 7-10
Preventive Maintenance Form......................................................................................................................... 7-12
Chapter 8 Troubleshooting ...................................................................................................................8-1
Machine Not Running......................................................................................................................................... 8-1
Freeze-Up from Extended Freeze Period ........................................................................................................... 8-2
Freeze-Up from Ice Failing to Discharge............................................................................................................. 8-3
Poor Ice Quality .................................................................................................................................................. 8-4
Low Ice Capacity ................................................................................................................................................. 8-4
High Head Pressure (Water-Cooled Machines).................................................................................................. 8-5
Chapter 9 Servicing Operations.............................................................................................................9-1
Automatic Blowdown......................................................................................................................................... 9-1
Makeup Water Float Valve................................................................................................................................. 9-1
Hand Expansion Valve ........................................................................................................................................ 9-1
Freezer Pressure Switch on Touch Screen HMI.................................................................................................. 9-1
Freeze Timer on Touch Screen HMI ................................................................................................................... 9-1
Low Pressure Safety on Touch Screen HMI........................................................................................................ 9-1
High Pressure Safety on Touch Screen HMI ....................................................................................................... 9-2
Head Pressure Control........................................................................................................................................ 9-2
Control Circuit Protection................................................................................................................................... 9-2
Harvest Timer ..................................................................................................................................................... 9-2
Pumpdown ......................................................................................................................................................... 9-3
Refrigerant Leaks................................................................................................................................................ 9-4
Non-Condensable Gases..................................................................................................................................... 9-4
Valve Stations ..................................................................................................................................................... 9-5
Capacitive Level Control ..................................................................................................................................... 9-6
Set Point and Operation................................................................................................................................. 9-7