Led Lights And Audible Alarm Safeties - Hoshizaki DCM-751BAH Service Manual

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."
Sequence Step
Fill Cycle WTRIN
Ice Purge Cycle GM
Freeze Cycle GM, WTRIN* (refill),
(with refill) COMP
Drain Cycle FLUSH (Drain)
Sequence Step
Ice Dispense ICE, AM*
Activation
Dispense Water WTRDP
Valve Activation
The built-in alarm safeties shut down the appliance.
No. of Beeps
(every 5 sec.)
1 Low Water Safety
UFS open > 90 seconds after WV energized.
2 Control Switch
In "DRAIN" position longer than 15 minutes.
3 High-Pressure Switch
First and second activation in 1 hour.
4 High-Pressure Switch
Third activation in 1 hour.
5 Freeze Timer
WV off > 30 minutes since last WV activation.
6 Low Voltage
(92Vac ±5% or less)
7 High Voltage
(147Vac ±5% or more)
8 Gear Motor
GMPR contacts fail to close.
9 Infrared Sensor (S1 dip switch 7)
(Not used on this model)
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 float switch; WV–inlet water valve
Icemaking Sequence
Energized
LED
Components
WV
GM, FM
GM, Comp,
FM, WV*
(refill)
DV
Dispensing Sequence
Energized
LED
Components
IDS**, IDM**,
AM*
DispWV
Type of Alarm
Min.
- On until UFS closes. Alarm sounds
after 90 sec.
5 min. 5 min.
- *On until UFS closes. Alarm
sounds after 90 sec.
2 sec. 10 min.
Time LEDs are on
*AM energizes 60 sec. per
.6 sec. every 12 activation
sec. of cumulative
dispense time
Automatic reset once water supply is restored
and UFS closes.
Automatic reset once the control switch is
moved to the "ICE" position.
Automatic reset once pressure drops
below the high pressure threshold and the
high-pressure switch closes.
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.
Manual reset. Turn power off and on again.
"POWER OK" LED turns off if voltage
protection operates.
The control voltage safeties automatically
reset when voltage is corrected.
Manual reset. Turn power off and on again.
Manual reset. Turn power off and on again.
35
Max.
**Dispense Mode Switch
Continuous Portion
Adjustable
between 0.2 sec.
and 20 sec.
Reset Options