Hoshizaki KM-320MAH Service Manual page 22

7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
first pump-out is dependent on CB. "E" CB first pump-out is after the first freeze cycle.
"G" CB first pump-out is determined by S4 dip switch 5 & 6. See the table below.
"E" & "G" Control Board Settings
S4 Dip Switch Setting
No. 5
OFF
ON
OFF
ON
Comp and FMR continue, HGV energizes. If S4 dip switch 3 & 4 are set to 3 off and 4
on, LED 4 turns on and WV energizes. FM and LLV de-energize. PM stops for 2 sec.,
then reverses for 10/20 sec. depending on pump-out timer (S4 dip switch 3 & 4) setting.
When the pump-out timer terminates, pump-out is complete. The pump-out frequency
control (S4 dip switch 5 & 6) is factory set, and generally no adjustment is required.
However, the pump-out frequency control can be set to have a pump-out occur every
cycle, or every 2, 5, or 10 cycles. For details, see "III.C.4. Pump-Out Frequency Control
(S4 dip switch 5 & 6)."
Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above),
disconnect CB black K5 connector (FS connector) after 5 min. of freeze. Check that PM
stops and re-starts and water is flowing down the drain through CV. If PM does not stop
and re-start, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. If LEDs 1, 3,
and 2 are on and PM does not energize, check for 115VAC at
CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB.
If 115VAC is present, make sure the drain line is not clogged and that CV is clean and
operating properly.
Confirm FM and LLV de-energize. If FM or LLV is energized with LEDs 1, 3, and 2 on,
replace CB.
8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5 above.
Note: Appliance continues to cycle until TBC or MBC is satisfied or power is turned off.
The appliance always restarts at the 1-min. fill cycle.
Pump-Out
Frequency
No. 6
OFF Every cycle
OFF Every 2 cycles
ON Every 5 cycles
ON Every 10 cycles
1st Pump-Out
"E" Control Board
After 1st freeze cycle
22
"G" Control Board
After 2nd freeze cycle
After 3rd freeze cycle
After 6th freeze cycle
After 11th freeze cycle