Hoshizaki DCM-750BAH-OS, DCM-750BWH-OS service manual Startup

Page 13

DCM-750BAH(-OS), DCM-750BWH(-OS) Sequence Flow Chart and Component Operation

4. 12 Hour Drain Cycle

DV opens for 20 minutes every 12 hours

See "3. 12 Hour Drain Cycle" below.

1. Startup

Power switch "ON" Control switch in "ICE"

1. Fill Cycle

2.Ice Purge Cycle

60 seconds

3. Freeze Cycle

Refill (90 seconds)

Low Water Safety

If refill > 90 sec. FT, 150 second shutdown sequence begins

150 sec. Shutdown Sequence

 

 

 

90 seconds

 

60 seconds

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

UF/S open

LF/S closed

 

 

 

 

 

 

 

 

WV on

 

 

 

LF/S closed

Comp on

UF/S open

Comp off

GM off

 

 

 

 

UF/S open

 

LF/S open (WV on)

UF/S closed (WV off)

 

 

 

UF/S closed (WV off)

FMS on

WCR off

WCR on

FT exceeded

FMS off

GMPR off

 

 

 

 

 

 

 

WCR on

WCR continues

Comp continues

WV continues

HCR off

 

 

 

 

 

 

FT started (90 sec.)

FT off (90 sec.)

 

 

 

 

 

 

WV off

GM continues

FMS continues

GM continues

HTR off

 

 

 

 

 

 

WV on

WV off

 

 

 

 

 

 

GM on

GMPR continues

GM continues

GMPR continues

WV continues until

 

 

 

 

 

 

GMPR on

HCR continues

Comp continues

Comp continues

GMPR continues

HCR continues

UF/S closes

 

 

 

 

 

 

FMS continues

FMS continues

 

 

 

 

 

 

HCR on

HTR continues

HCR continues

HTR continues

 

 

 

 

 

 

 

 

 

GM continues

GM continues

 

 

 

 

 

 

 

 

 

HTR on

 

 

HTR continues

 

 

 

 

 

 

 

 

 

 

 

 

 

GMPR continues

GMPR continues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WV continues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HCR continues

HCR continues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HTR continues

HTR continues

 

 

 

 

 

 

 

 

2.Shutdown & Restart

3.12 Hour Drain Cycle Shutdown & Restart

 

 

1. Bin Full

 

 

2. Ice Purge Cycle

 

 

 

150

 

 

 

 

 

 

 

 

seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90 seconds

 

60 seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Drain Cycle initiates

 

 

 

2. Ice Purge Cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Icemaker is Off

 

4. Ice Level Lowered

 

 

 

 

 

See "1. Fill Cycle" above

 

 

 

 

 

3. Drain Cycle

4. 12 hour DC - Restart

DV on for 20 minutes

See "1. Fill Cycle" above

Legend:

BC - bin control

Comp - compressor

DC - drain cycle

DT - drain timer

DV - drain valve

FMS - self-contained fan motor

BC open or DC starts

Comp off

Comp continues

FMS off

FMS continues

GM continues

GM continues

GMPR continues

GMPR continues

HCR continues

HCR continues

HTR continues

HTR continues

 

GM off

BC closed

GMPR off

or

HCR off

20 Min. DT off (DC only)

HTR off

DV off (DC only)

DV on (DC only)

12 hour DT reset (DC only)

FT - fill timer (low water safety) GM - gear motor

GMPR - gear motor protect relay HCR - heater control relay HTR - extruding head heater LF/S - lower float switch

UF/S - upper float switch WCR - water control relay

Components Energized when the Control Switch is in the "DRAIN" Position

The "DRAIN" position on the control switch is used when cleaning and sanitizing the unit. This allows cleaner and sanitizer to drain from the reservoir and evaporator assembly. When switching to the "DRAIN" position during the freeze cycle, the drain valve does not energize until the 150 second shutdown sequence terminates (2. Shutdown & Restart).

Note: To bypass the 150 second shutdown sequence, move the power switch to the "OFF" position, place the control switch in the "DRAIN" position, then move the power switch back to the "ON" position.

WV - inlet water valve

Image 13
Contents DCM-750BAH DCM-750BAH-OS DCM-750BWH DCM-750BWH-OS Hoshizaki AMERICA, INC Contents Page DCM-750BAH Specifications IcemakerWater TEMP. F DCM-750BAH-OSPotable Water WATER-COOLED Condenser DCM-750BWHPotable Water Water Cooled Condenser DCM-750BWH-OSII. General Information Construction DCM-750BWH-OS Ice Making Unit Sequence of Operation Startup Control Board Control Board Control Board Layout DCM-750BAH, DCM-750BWHDCM-750BAH-OS, DCM-750BWH-OS LED Lights FeaturesControl Board Check Procedure Controls and Adjustments Portion ControlPower Supply Ice Making ComponentsDispensing Components DCM-750BAH, DCM-750BWH Float Switch Inlet Water Valve DCM-750BWH-OS Wire Color Code Wiring DiagramsDCM-750BAH-OS, DCM-750BWH-OS DCM-750BWH-OS Sequence of Electrical Circuit Ice MakingIce Purge Cycle Orange WHITE/BLACK Pink WHITE/BROWN RED WHITE/BLUE Violet Hour Drain Cycle / Drain Switch Shutdown Low Water Safety High Pressure Switch Continuous Dispense Sequence of Electrical Circuit DispensingPortion Dispense 192 Performance DataApproximate IV. Service Diagnosis Diagnostic Procedure Ice Production Check No Ice Production Diagnostic ChartsProblem Possible Cause Remedy Problem Possible Cause Remedy Low Ice Production Other Dispensing Opti Serve OS Sensors 5b. Ice Dispensing Portion Mode 5a. Ice Dispensing Continuous Mode5c. Water Dispensing Service for Refrigerant Lines Removal and Replacement of ComponentsRefrigerant Recovery BrazingEvacuation and Recharge R-404A Removal and Replacement of Compressor Removal and Replacement of Expansion Valve Removal and Replacement of Evaporator Assembly Components Upper Bearing Wear Check Removal and Replacement of Extruding HeadRemoval and Replacement of Evaporator Removal and Replacement of AugerPage 5b. Lower Housing Removal and Replacement of Gear Motor Page Removal and Replacement of Water-Cooled Condenser Page Removal and Replacement of Fan Motor Adjustment of Water Regulating Valve Water-Cooled Model OnlyRemoval and Replacement of Drain Valve Removal and Replacement of Inlet or Dispensing Water ValveDispensing Auger and Agitator Removal and Replacement of Dispensing SystemDispensing or Agitating Motor Page Cleaning and Sanitizing Instructions VI. Cleaning and MaintenanceWater System Cleaning SolutionDispensing Components Sanitizing SolutionBin Control Bracket Snap Pin Frequency Area Task MaintenancePreparing the Icemaker for Long Storage