Service Manual
ManualsBrandsHoshizaki ManualsCommercial Countertop Ice Makers and DispensersDCM-751BAH 35" Stanitary Cubelet Ice Machine and Dispenser with 801 lbs. Daily Ice Production, Built-In 70 lbs. Ice Storage, Corrosion Resistant Stainless Steel Exterior, Advanced CleanCycle24 Design, and Push Button Operation: Stainless Steel
Table Of Contents
- Important Safety Information
- I. Construction and Water/Refrigeration Circuit Diagrams
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- A. Control Board Layout
- B. LED Lights and Audible Alarm Safeties
- C. Settings and Adjustments
- 1. Default Dip Switch Settings
- 2. Infrared Sensor Shutdown Delay (S1 dip switch 1, 2, 3)
- 3. Drain Frequency Control (S1 dip switch 4)
- 4. Continuous Dispensing Timer (S1 dip switch 5 & 6)
- 5. Bin Control Selector (S1 dip switch 7)
- 6. Bin Control Shutdown Delay (S1 dip switch 8)
- 7. Factory Use (S1 Dip Switch 9 & 10)
- D. Power Switch, Control Switch, and Dispense Mode Switch
- IV. Removal and Replacement of Components
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
35
B. LED Lights and Audible Alarm Safeties
The "POWER" LED indicates proper control voltage and will remain on unless a control
voltage problem occurs. For further details, see "II. Sequence of Operation and Service
Diagnosis."
Icemaking Sequence
Sequence Step LED
Energized
Components Min. Max.
Fill Cycle WTRIN WV - On until UFS closes. Alarm sounds
after 90 sec.
Ice Purge Cycle GM GM, FM 5 min. 5 min.
Freeze Cycle
(with rell)
GM, WTRIN* (rell),
COMP
GM, Comp,
FM, WV*
(rell)
- *On until UFS closes. Alarm
sounds after 90 sec.
Drain Cycle FLUSH (Drain) DV 2 sec. 10 min.
Dispensing Sequence
Sequence Step LED
Energized
Components
Time LEDs are on
**Dispense Mode Switch
Continuous Portion
Ice Dispense
Activation
ICE, AM* IDS**, IDM**,
AM*
*AM energizes
.6sec. every 12
sec. of cumulative
dispense time
60 sec. per
activation
Adjustable
between 0.2 sec.
and 20 sec.
Dispense Water
Valve Activation
WTRDP DispWV
The built-in alarm safeties shut down the appliance.
No. of Beeps
(every 5 sec.)
Type of Alarm Reset Options
1 Low Water Safety
UFS open > 90 seconds after WV energized.
Automatic reset once water supply is restored
and UFS closes.
2 Control Switch
In "DRAIN" position longer than 15 minutes.
Automatic reset once the control switch is
moved to the "ICE" position.
3 High-Pressure Switch
First and second activation in 1 hour.
Automatic reset once pressure drops
below the high pressure threshold and the
high-pressure switch closes.
4 High-Pressure Switch
Third activation in 1 hour.
Call for service. To avoid possible catastrophic
failure, it is recommended to leave the
appliance off until this alarm is resolved.
Manual reset. Turn power off and on again.
5 Freeze Timer
WV off > 30 minutes since last WV activation.
Manual reset. Turn power off and on again.
6 Low Voltage
(92Vac ±5% or less)
"POWER OK" LED turns off if voltage
protection operates.
The control voltage safeties automatically
reset when voltage is corrected.
7 High Voltage
(147Vac ±5% or more)
8 Gear Motor
GMPR contacts fail to close.
Manual reset. Turn power off and on again.
9 Infrared Sensor (S1 dip switch 7)
(Not used on this model)
Manual reset. Turn power off and on again.
Legend: AM–agitating motors, Comp–compressor; DispWV–dispense water valve;
DV–drain valve; EH–evaporator heater; FM–fan motor; GM–gear motor;
GMPR–gear motor protect relay; IDM–ice dispensing motor; IDS–ice dispensing
shutter solenoid; UFS–upper oat switch; WV–inlet water valve