Hoshizaki RELIABILITY IS A BEAUTIFUL THING DCM-270BAH-OS - Manual (Page 3)

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Please review this manual. It should be read carefully before the ice dispenser is serviced
or maintenance operations performed. Only qualified service technicians should service
and maintain the dispenser. This manual should be made available to the technician prior to
service or maintenance.
CONTENTS
I. Specifications .................................................................................................................... 4
1. DCM-270BAH-OS (air-cooled) ..................................................................................... 4
II. General Information .......................................................................................................... 5
1. Construction ................................................................................................................. 5
2.Operation - How it works ............................................................................................... 6
III. Technical Information ....................................................................................................... 7
1. Water Circuit and Refrigerant Circuit............................................................................. 7
2. Performance Data ......................................................................................................... 8
[a] DCM-270BAH-OS (air-cooled) .............................................................................. 8
3. Wiring Diagram ............................................................................................................. 9
4. Sequence of Electrical Circuit .................................................................................... 10
IV. Service Diagnosis .......................................................................................................... 20
1. No Ice Production ....................................................................................................... 20
2. Low Ice Production ..................................................................................................... 22
3. Faulty Dispenser......................................................................................................... 23
[a] Optical Sensor Description .................................................................................. 23
4. Other ........................................................................................................................... 25
V. Removal and Replacement of Components ................................................................... 26
1. Service for Refrigerant Lines ...................................................................................... 26
[a] Refrigerant Recovery ........................................................................................... 26
[b] Evacuation and Recharge [R-404A] .................................................................... 26
2. Brazing ....................................................................................................................... 27
3. Removal and Replacement of Compressor ................................................................ 28
4. Removal and Replacement of Drier ........................................................................... 29
5. Removal and Replacement of Thermostatic Expansion Valve ................................... 30
6. Removal and Replacement of Pressure Switch ......................................................... 31
7. Removal and Replacement of Control Water Valve .................................................... 32
8. Removal and Replacement of Flush Water Valve ....................................................... 33
9. Removal and Replacement of Float Switch ................................................................ 34
10. Removal and Replacement of Bin Control Switch Assembly ................................... 35
11. Removal and Replacement of Storage Bin Assembly .............................................. 36
12. Removal and Replacement of Agitator and Drip Ring .............................................. 37
13. Removal and Replacement of Evaporator Assembly ............................................... 38
VI. Cleaning and Maintenance Instructions ........................................................................ 41
1. Preparing the Ice Dispenser for Long Storage ............................................................ 41
2. Cleaning Instructions .................................................................................................. 42
[a] Cleaning Procedure ............................................................................................ 42
[b] Sanitizing Procedure ........................................................................................... 45
2. Maintenance Instructions ............................................................................................ 46