Hoshizaki KML-325MWJ Service Manual page 20

i) Short Freeze Cycle Diagnosis: Confirm water tank fills and overflows during 1 min.
fill and harvest cycles. If not, check water supply filters, shut-off valve, WV screen.
If water tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by or energized (water flowing through DV). If DV is leaking by,
remove and clean DV, replace as needed. If water tank is full, see "II.E. Float Switch
Check and Cleaning." for erratic operating FS.
7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
first pump-out is determined by S4 dip switch 5. See the table below.
S4 Dip Switch Setting
Comp and X14 relay continue, HGV energizes, FM, FMR, and LLV de-energize.
NOTICE! S4 dip switch 3 & 4 must not be set to 3 off and 4 on. Otherwise, LED
4 turns on energizing WV and X11 relay. Once X10 relay energizes, the DV cannot
energize. PM stops for 2 sec., then PM and DV energize 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) 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 10 cycles. For details, see
"III.C.4. Pump-Out Frequency Control (S4 dip switch 5)."
a) Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after
5 min. of freeze disconnect CB black K5 connector (FS connector). Check that CB
LEDs 1, 3, and 2 are on, PM stops, then re-starts, DV energizes, and water is flowing
down the drain through DV.
b) CB Diagnosis: Confirm FMR, FM, and LLV de-energize. If FRM, FM, or LLV are
energized with LEDs 1, 3, and 2 on, replace CB. If PM does not stop and re-start
and DV does not energize, check that CB LEDs 1, 3, and 2 are on. If not, replace CB.
If LEDs 1, 3, and 2 are on and PM and DV do not energize, check for 115VAC at CB
K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB.
c) X10 and X11 Relays: If 115VAC is present at CB K1 #5 (DBU), check for 115VAC
at X10 relay #1 (DBU) to neutral (W). If 115VAC is not present, check that X10 relay
is de-energized. If X10 relay is de-energized and 115VAC not present at X10 relay
#1 (DBU), replace X10 relay (contacts sticking). If X10 relay is energized, check
X11 relay status. If X11 relay is energized, check that S4 dip switch 3 and 4 are not
set to 3 on and 4 off positions, if not and X11 is energized, replace CB. If X11 relay is
de-energized and X10 relay is energized, replace X11 relay (contacts sticking).
d) X12 Relay: If 115VAC is present at X10 #1 (DBU), check for 115VAC at X12 relay
#5 (DBU) to neutral (W) and X12 relay #3 (DBU) to neutral (W). If 115VAC is present
at X12 relay #5 (DBU) and not at X12 relay #3 (DBU), check for 115VAC at X12
relay #8 (P) to neutral (W). If 115VAC is present at X12 relay #8 (P) and X12 relay
is de-energized, replace X12 relay. If 115VAC is not present, check CB K1 #2 (P) to
neutral (W). If 115VAC is not present (HGV de-energized as well), replace CB.
Control Board Settings
Pump-Out
Frequency
No. 5
OFF Every 10 cycles
ON Every cycle
1st Pump-Out
After 11th freeze cycle
After 2nd freeze cycle
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