C) Harvest Timer (S4 Dip Switch 1 & 2); D) S4 Dip Switch 3, 4, 5, 6, 7, & 8; E) Freeze Timer (S4 Dip Switch 9 & 10); F) Float Switch Control And Refill Counter (S5 Dip Switch 1 Through 5) - Hoshizaki KM-251BAH Service Manual

3) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
4) Verify the temperature of the glass, then check for resistance between thermistor leads.
See the table above for temperature and resistance values. Normal reading is within
3.5 to 7 kΩ. Replace the thermistor if it exceeds the normal reading.
c) Harvest Timer (S4 dip switch 1 & 2)
The harvest timer starts counting when the thermistor reads 48°F (9°C) at the
evaporator outlet.
No adjustment is required under normal use, as the harvest timer is adjusted to the
suitable position. Before changing this setting, call the HOSHIZAKI Technical Support
Department at 1-800-233-1940 for recommendations. Keep in mind that setting the
harvest timer to a longer setting will decrease 24 hour production.
d) S4 dip switch 3, 4, 5, 6, 7, & 8
Factory set for optimum performance. Do not adjust.
e) Freeze Timer (S4 dip switch 9 & 10)
Adjust to proper specification, or the unit may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent
possible freeze-up issues. Upon termination of freeze timer, the control board initiates
the harvest cycle. After 2 consecutive timer terminations, the control board shuts the
machine down. In this case, see "IV.B.3. Low Ice Production" for possible solutions.
The freeze timer is factory adjusted and no adjustment is required.
f) Float Switch Control and Refill Counter (S5 dip switch 1 through 5)
These must be left in the factory default position or the unit will not operate properly. Do
not adjust. The KM-251BAH refills 9 times.
Note:There are no refills during the first 5 minutes of the freeze cycle. The first refill
generally lasts about 10 seconds and subsequent refills generally last about 5
seconds.
Dip Switch Setting
(seconds)
No. 1 No. 2
OFF OFF
ON OFF
OFF ON
ON ON
CAUTION
Dip Switch Setting
No. 9 No. 10
OFF OFF
OFF ON
ON OFF
ON ON
15
Time
60
90
120
180
Time
(minutes)
60
50
70
60