Hoshizaki KMD-460MAJ Service Manual page 21

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 X12 relay, 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 FMR, 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 Diagnosis: 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 Diagnosis: 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
21
1st Pump-Out
After 11th freeze cycle
After 2nd freeze cycle