Hoshizaki KM-901MWH - Manual (Page 33)

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c) Pump-Out Timer (S4 dip switch 3 & 4)
When a pump-out is called for, the pump motor de-energizes after the preceding freeze
cycle. The pump motor energizes 2 seconds later in the reverse direction, taking water
from the bottom of the tank and forcing pressure against the check valve seat allowing
water to go through the check valve and down the drain. At the same time, water flows
through the small tube to power flush the float switch. The pump motor drains the water
tank for the time determined by the pump-out timer. The pump-out timer also acts in
place of the harvest timer during cycles with a pump-out. The pump-out timer is factory
set, and generally no adjustment is required. However, where water quality is bad and
the icemaker needs a longer pump-out time, the pump-out timer can be adjusted. The
pump-out timer control can be set to pump-out for 10 or 20 seconds.
S4 Dip Switch Setting Time (seconds)
Inlet
Water
Valve No. 3 No. 4 T1 T2
OFF OFF 10 150 Closed
ON OFF 10 180 Closed
OFF ON 10 120 Open
ON ON 20 180 Closed
T1: Time to drain the water tank
T2: Harvest timer at pump-out
d) Pump-Out Frequency Control (S4 dip switch 5 & 6)
The pump-out frequency control is factory set to drain the water tank every 10 cycles,
and generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The
pump-out frequency control can be set to have a pump-out occur every cycle, or every
2, 5, or 10 cycles.
Timing of the first pump-out is dependent on the control board. "E" control board first
pump-out is after the first freeze cycle. "G" control board first pump-out is dependent on
S4 dip switch 5 & 6. See the table below.
"E" & "G" Control Board Settings 1st Pump-Out
S4 Dip Switch Setting Pump-Out
Frequency
"E" Control Board "G" Control Board
No. 5 No. 6
OFF OFF Every cycle After 1st freeze cycle After 2nd freeze cycle
ON OFF Every 2 cycles After 3rd freeze cycle
OFF ON Every 5 cycles After 6th freeze cycle
ON ON Every 10 cycles After 11th freeze cycle