Hoshizaki KM-301BAJ Service Manual page 16

c) WRV Diagnosis: Confirm WRV is not leaking by. If WRV is leaking by, confirm
HGV is open. Next, check for proper refrigerant pressures. If refrigerant pressures
are correct, adjust or replace WRV. See "IV.C. Water Regulating Valve Adjustment
(water-cooled models)."
5b) Harvest Pump Time (Harvest Assist) – LEDs 5, 6, and 7 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 (S1 dip switch 1 & 2 and S2 dip switch 4).
When WV de-energizes, LED 8 turns off and LED 7 turns on. PM energizes. Comp and
HGV continue.
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." If the thermistor reading is in proper range, dip switch 7 is on, and PM does
not energize before harvest terminates, replace CB. If WV continues, check for 115VAC
at CB K5 #4 (O). If 115VAC is present, and LED 8 is off, replace CB. If LED 7 is on and
PM is not energized, check for 115VAC at CB K5 #3 (DBU). If 115VAC is not present,
replace CB. If 115VAC is present and PM is not energized, check for 115VAC at the
control switch terminal #4 (DBU) and #5 (BK). If 115VAC is present, replace control
switch. If contacts are closed and 115VAC is present between control switch terminal
#5 (BK) and neutral (W), 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 (S1 dip switch 1 & 2 and S2 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
S2 dip switch 4. Maximum harvest time allowed is 20 min.
NOTICE! S1 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.
6) Freeze Cycle – LED 5 and 7 are on. Comp and PM continue. FM energizes. HGV
de-energizes. Appliance is held in freeze by a temperature/time short cycle protection
cycle.
Thermistor reaches 36°F (2°C), then the 5-min. short cycle protection timer starts.
After the 5-min. short cycle protection timer terminates and FS opens, freeze cycle
terminates.
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