Hoshizaki dcm-75ibah service manual Contents

Page 3

IMPORTANT

 

This manual should be read carefully before the appliance is serviced. Read

 

the warnings and guidelines contained in this manual carefully as they provide

 

essential information for the continued safe use, service, and maintenance of the

 

appliance. Retain this manual for any further reference that may be necessary.

 

CONTENTS

 

Important Safety Information

5

I. Construction and Water/Refrigeration Circuit Diagrams

7

A. Construction

7

1. DCM-751BAH(-OS)

7

2. DCM-751BWH(-OS)

8

3. Ice Making Unit

9

B. Water/Refrigeration Circuit Diagrams

10

1. DCM-751BAH(-OS)

10

2. DCM-751BWH(-OS)

11

II. Sequence of Operation and Service Diagnosis

12

A. Sequence of Operation Flow Chart

12

B. Service Diagnosis

13

C. Control Board Check

18

D. Bin Control Check

26

E. Float Switch Check and Cleaning

27

F. Diagnostic Tables

29

1. No Ice Production

29

2. Ice/Water Dispensing

31

III. Controls and Adjustments

32

A. Control Board Layout

33

1. DCM-751B_H

33

2. DCM-751B_H-OS

34

B. LED Lights and Audible Alarm Safeties

35

C. Settings and Adjustments

36

1. Default Dip Switch Settings

36

2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)

36

3. Drain Frequency Control (S1 dip switch 4)

36

4. Continuous Dispensing Timer (S1 dip switch 5 & 6)

37

5. Bin Control Selector (S1 dip switch 7)

37

6. Bin Control Shutdown Delay (S1 dip switch 8)

37

7. Factory Use (S1 Dip Switch 9 & 10)

37

D. Power Switch, Control Switch, and Dispense Mode Switch

38

IV. Removal and Replacement of Components

40

A. Service for Refrigerant Lines

40

1. Refrigerant Recovery

41

2. Brazing

41

3. Evacuation and Recharge (R-404A)

41

3

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Contents DCM-751BAH-OS DCM-751BWH-OS Hoshizaki AMERICA, INC Contents Page Important Safety Information Page DCM-751BAH-OS Construction and Water/Refrigeration Circuit DiagramsDCM-751BWH-OS Ice Making Unit Water/Refrigeration Circuit Diagrams Spout Inlet Water Valve Water Supply Float Diagnosis Control Board Sequence Flow Chart DCM-751BH-OSChart OperationService Diagnosis Diagnostic ProcedureIce Production Check Page Page Page Page Control Board Check 5VDC CB K9 Connector See Fig High-Pressure Switch HPS5VDC CB K9 Connector Component Pin # Wire Color Bin Control BC 5VDC CB K8 Connector See Fig5VDC CB K8 Connector Component Pin # Wire Color Gear Motor Protect Relay Gmpr5VDC 0VDC Portion Signal #5 R Red K4 pin closest 5VDC Power Supply #3 W/BK Connector Pin # Wire Color Neutral LBU Open Closed 24VAC CB K2 ConnectorBin Control Check Float Switch Check and Cleaning Float Switch CheckFloat Switch Cleaning Page Diagnostic Tables No Ice ProductionNo Ice Production Possible Cause Startup Shutdown No Ice Production Possible CauseWater Dispense-Push Button Ice/Water DispensingIce Dispense-Push Button Ice Dispense-Opti-ServeIII. Controls and Adjustments DCM-751BH Control Board LayoutDCM-751BH-OS K2 Connector Drain Valve #10 W/BUEnergized Components Min Max LED Lights and Audible Alarm SafetiesNo. of Beeps Type of Alarm Reset Options Every 5 sec Icemaking Sequence Sequence StepDrain Frequency Control S1 dip switch Settings and AdjustmentsDefault Dip Switch Settings Infrared Sensor Shutdown Delay S1 dip switch 1, 2Factory Use S1 Dip Switch 9 Continuous Dispensing Timer S1 dip switch 5Bin Control Selector S1 dip switch Bin Control Shutdown Delay S1 dip switchDrain Power Switch, Control Switch, and Dispense Mode SwitchICE OFFDispense Mode Switch ContinuousPortion Service for Refrigerant Lines IV. Removal and Replacement of ComponentsRefrigerant Recovery BrazingEvacuation and Recharge R-404A Evaporator Assembly Components. See Fig Important Notes for Component ReplacementEvaporator Assembly Upper Bearing Wear Check Icemaking UnitRemoval and Replacement of Auger Removal and Replacement of Extruding HeadRemoval and Replacement of Evaporator 5b. Lower Housing Removal and Replacement of Gear Motor Dispense Components Dispense Auger and AgitatorDispense and Agitating Motors Maintenance Maintenance ScheduleFrequency Area Task VI. Preparing the Appliance for Periods of Non-Use Page VII. Disposal DCM-751BAH VIII. Technical Information Specification SheetsDesign without prior Potable Water WATER-COOLED Condenser DCM-751BWH779 758 Reference without *marks 738 719 ICE Production Performance Data800 363 Wiring Diagrams DCM-751BH-OS