Hoshizaki KM-61BAH, Service Manual

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15
seconds and the icemaker automatically stops. The control board will signal this problem
using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insuf
fi cient voltage (92Vac ± 5% or
less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
f) LED Lights and Audible Alarm Safeties
The control board includes LED indicator lights, audible alarm safeties, and an output
test feature. The "POWER OK" LED indicates control voltage and will remain on unless
a control voltage problem occurs. The “POWER OK” LED
fl ashes continuously when the
bin is full and DV energizes for a maximum of 5 minutes to drain the water tank.
At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 energize
and sequence from initial startup as listed in the table below. Note that the order of the
LEDs from the outer edge of the board is 5, 6, 8, 4, 7. For more information, see "2.
SEQUENCE OF OPERATION".
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max. Avg.
1 Minute Fill Cycle 8 WV 60 seconds
Harvest Cycle 5, 6, 8
WV, HGV,
Comp
2 minutes 20 minutes 3 to 5 minutes
Last 0, 10, 30, or 50 seconds (adjustable by dip switch) of harvest, WV de-energizes
and PM energizes (LEDs 5, 6, and 7 are on)
Freeze Cycle 5, 7
Comp, PM,
FMS
5 minutes
freeze timer
setting
30 to 35 minutes
Drain 5, 6, 4
Comp, HGV,
DV
10 seconds 20 seconds
factory default
setting
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
Type of Alarm Notes
1
High Evaporator Temp.
(temperature > 127°F)
(53°C) Check for harvest problem (stuck HGV or
relay), hot water entering unit, stuck HM, or
shorted thermistor.
2
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row) Check for open thermistor, HGV not
opening, TXV leaking by, low charge,
inef
fi cient Comp, or WRV leaking by.
3
Freeze Timer
(freeze > specified setting
for two cycles in a row)
Timer is factory set using
S1 dip switch 9 & 10 Check for a float switch stuck closed (up),
WV leaking by, HGV leaking by, PM not
pumping, TXV not feeding properly, low
charge, or inef
fi cient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply
on.