D) Pump-Out Frequency Control (S4 Dip Switch 5 & 6); E) Harvest Pump Timer/Bin Control Selector (S4 Dip Switch 7) - Hoshizaki KM-1601SAH/3 Service Manual

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
(except for KM-1601SRH/3 utilizing 3U0111-02 water valve), 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. For KM-1601SAH/3 ("G"
control board), first pump-out is dependent on S4 dip switch 5 & 6. See the table below.
For KM-1601SWH/3 and KM-1601SRH/3 ("E" control board), first pump-out is after the
first freeze cycle.
KM-1601 SAH/3 "G" & KM-1601SWH/3 & KM-1610SRH/3 "E" Control Board
S4 Dip Switch Setting
No. 5 No. 6
OFF OFF
ON OFF
OFF ON
ON ON

e) Harvest Pump Timer/Bin Control Selector (S4 dip switch 7)

Depending on the control board, S4 dip switch 7 is either a harvest pump timer or bin
control selector.
(1) Harvest Pump Timer, KM-1601SAH/3 "G" Control Board
Factory set for proper operation. Do not adjust. Adjustment outside of the
factory default setting may result in damage to the icemaker.
Depending on the harvest pump timer setting, the pump motor energizes and runs
the last 0 or 50 seconds of harvest. When the pump is on, water circulates over the
evaporator. The water valve is open during harvest for a maximum of 6 minutes or the
length of harvest minus 0 or 50 seconds (determined by the harvest pump timer setting),
whichever is shorter.
When S4 dip switch 7 is on, the pump motor is energized through the #5 pin (DBU wire)
on the control board K1 ten-pin connector and the X10 relay. The #5 pin (DBU wire)
is used in most applications to reverse the pump motor or energize the drain valve in
pump-out cycles. In this application, it is used for the pump-out cycle (reverse rotation) as
well as the harvest pump timer (freeze rotation). Therefore, the harvest pump timer relays
are needed to control the pump motor direction during the pump-out and harvest cycles.
See "III.B. Wiring Diagrams."
Pump-Out KM-1601SAH/3
Frequency "G" Control Board
Every cycle After 2nd freeze cycle
Every 2 cycles After 3rd freeze cycle
Every 5 cycles After 6th freeze cycle
Every 10 cycles After 11th freeze cycle
CAUTION
KM-1601SAH/3
"G" Control Board
S4 Dip Switch Setting
No. 7
ON
OFF
34
1st Pump-Out
KM-1601SWH/3
KM-1601SRH/3
"E" Control Board
After 1st freeze cycle
Pump Motor
Time (seconds)
50
0