Hoshizaki KM-40B, Service Manual

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b) Harvest Timer (S1 dip switch 1 & 2)
Used for adjustment of the harvest timer. The harvest timer starts counting when the
thermistor reads a certain temperature at the evaporator outlet.
Dip Switch Setting
Time
(seconds) No. 1 No. 2
OFF OFF 60
ON OFF 90
OFF ON 120
ON ON 180
c) Drain Timer (S1 dip switch 3 & 4)
Once every ten freeze cycles, the drain valve opens to drain the water tank for the
time determined by the drain timer. These switches also determine the time to delay
completion of a defrost cycle, i.e. the minimum defrost time.
Do not change this setting, or the unit will not operate properly or produce high quality
ice.
Dip Switch Setting Time (seconds)
No. 3 No. 4 T1 T2
OFF OFF 10 120
ON OFF 20 160
OFF ON 20 120
ON ON 20 180
T1: Time to drain the water tank
T2: Harvest timer at drain
Drain cycle always occurs on the 2nd harvest after startup. Then, depending on the
drain frequency control setting (dip switch 5 & 6), drain cycle occurs every cycle, or
every 2nd, 5th, or 10th cycle.
d) Drain Frequency Control (S1 dip switch 5 & 6)
The water tank drains at the frequency set by the drain frequency control.
The drain frequency control is factory-adjusted to drain the water tank every 10 cycles,
and no adjustment is required. However, where water quality is bad and the icemaker
needs a drain more often, the drain frequency can be adjusted as shown in the table
below.