Hoshizaki KMD-460MAJ Service Manual page 18

5b) Harvest Pump Time (Harvest Assist) – LEDs 1, 3, and 2 are on. When the
thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest
termination over to the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4).
When WV de-energizes, LED 4 turns off, X11 relay de-energizes and LED 3 turns on.
PM energizes. Comp, HGV, X10, X12, and X14 relays continue.
a) Thermistor Diagnosis: Place a thermometer on the suction line next to the
thermistor. Has it warmed to 48°F (9°C) or warmer? Confirm thermistor status. See
"II.F. Thermistor Check."
b) Control Board Diagnosis: If the thermistor reading is in proper range, dip switch 7 is
on, and WV continues, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is
present, and LED 4 is off, replace CB. If LED 3 is on and PM is not energized, check
for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB.
c) Relay Diagnosis: If 115VAC is present and PM is not energized, check for 115VAC at
X10 relay #8 (Y) to neutral (W). If 115VAC is not present on X10 relay #8 (Y), check
for 115VAC at X10 relay #4 (P) and X10 relay #6 (Y) to neutral (W) (latching circuit). If
115VAC is present at X10 relay #4 (P) and not at X10 relay #6 (Y), replace X10 relay.
If 115VAC is present on X10 relay #8 (Y) and PM is not energized, check for 115VAC
at X10 relay #3 (R) and X10 relay #5 (DBU) to neutral (W). If 115VAC is present at
X10 relay #5 (DBU) and not at X10 relay #3 (R), replace X10 relay.
d) Control Switch Diagnosis: If 115VAC is present at X10 relay #3 (R), check for
115VAC at control switch #6 (R) to neutral (W). Next, check for 115VAC at control
switch #5 (Y) to neutral (W). If 115VAC is present at control switch #6 (R) and not at
control switch #5 (Y), check control switch continuity. If contacts are open, replace
control switch.
e) Pump Motor Diagnosis: If 115VAC is present at control switch #5 (Y), check PM
capacitor and motor winding continuity.
5c) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F
(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to
the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). Check discharge line
temperature. For a thermistor check, see "II.F. Thermistor Check." If 1-min. fill cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.E. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle.
If not, replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.
NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.
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