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CONTENTS
I. Specifications .................................................................................................................... 4
1. F-450MAH .................................................................................................................... 4
2. F-450MAH-C ................................................................................................................ 5
II. General Information .......................................................................................................... 6
1. Construction .................................................................................................................6
2. Control Box Layout ....................................................................................................... 7
3. Timer Board ..................................................................................................................8
[a] Solid-State Control ................................................................................................ 8
[b] Timer Board ........................................................................................................... 8
[c] Sequence .............................................................................................................. 9
III. Technical Information ..................................................................................................... 12
1. Water Circuit and Refrigeration Circuit ........................................................................ 12
2. Wiring Diagram ........................................................................................................... 13
[a] F-450MAH ........................................................................................................... 13
[b] F-450MAH-C ....................................................................................................... 14
3. Sequence of Electrical Circuit .................................................................................... 15
4. Timing Chart ............................................................................................................... 25
5. Performance Data ....................................................................................................... 28
[a] F-450MAH ........................................................................................................... 28
[b] F-450MAH-C ....................................................................................................... 29
IV. Service Diagnosis.......................................................................................................... 30
1. No Ice Production ....................................................................................................... 30
2. Low Ice Production ..................................................................................................... 33
3. Other ........................................................................................................................... 34
V. Removal and Replacement of Components ................................................................... 35
1. Service for Refrigerant Lines ...................................................................................... 35
[a] Refrigerant Recovery........................................................................................... 35
[b] Evacuation and Recharge [R-404A] .................................................................... 35
2. Brazing ....................................................................................................................... 36
3. Removal and Replacement of Compressor ................................................................ 37
4. Removal and Replacement of Drier ........................................................................... 38
5. Removal and Replacement of Expansion Valve......................................................... 39
6. Removal and Replacement of Evaporator Assembly ................................................ 40
7. Removal and Replacement of Fan Motor ................................................................... 42
8. Removal and Replacement of Control Water Valve .................................................... 42
9. Removal and Replacement of Flush Water Valve ....................................................... 43
VI. Cleaning and Maintenance ........................................................................................... 44
1. Preparing the Icemaker for Long Storage ................................................................... 44
2. Cleaning and Sanitizing Instructions .......................................................................... 45
[a] Cleaning Solution ................................................................................................ 45
[b] Cleaning Procedure ............................................................................................ 46
[c] Sanitizing Solution............................................................................................... 47
[d] Sanitizing Procedure - Initial................................................................................ 47
[e] Sanitizing Procedure - Final ................................................................................ 48
3. Maintenance Instructions ............................................................................................ 50
Please review this manual. It should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified service technicians should service and
maintain the icemaker. This manual should be made available to the technician prior to service
or maintenance.