Hoshizaki KM-81BAJ Service Manual page 19

g) WRV (KM-161B_J) Diagnosis: WRV is factory set and generally no adjustment
is required. If WRV fails to open in freeze, check for proper refrigerant pressures.
See "VIII.A. Specification and Performance Data Sheets." If refrigerant pressures
are correct and WRV does not open, adjust or replace as needed. See "IV.C. Water
Regulating Valve Adjustment (water-cooled models)."
h) Freeze Termination Diagnosis: After thermistor has reached 36°F (2°C) and the
5 min. short cycle protection timer has terminated, disconnect the FS connector.
15 sec. later appliance should switch out of the freeze cycle (15 second delay after
FS opens before terminating the freeze cycle). If appliance remains in freeze longer
than 15 sec. after FS removed, replace CB. If appliance switches with FS removed
but would previously not switch out of freeze with FS connected (long freeze - 3 beep
alarm), see "II.E. Float Switch Check and Cleaning."
Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.
Cycle times and pressures should follow performance data provided in this manual.
See "VIII.A. Specification and Performance Data Sheets."
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 4, 5, 6, and 7 are on (10/20 second pump-out). Timing of
the first pump-out is determined by S1 dip switches 5 and 6. See the table below.
S1 Dip Switch Setting
No. 5
OFF
ON
Comp continues, HGV energizes. FM de-energizes. PM stops for 2 sec., then restarts
for 10/20 sec. depending on pump-out timer (S1 dip switch 3 & 4) setting. When the
pump-out timer terminates, pump-out is complete. The pump-out frequency control
(S1 dip switch 5 and 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 10 cycles or
every cycle. For details, see "III.C.4. Pump-Out Frequency Control (S1 dip switch 5)."
Control Board Settings
Pump-Out Frequency
No. 6
OFF Every cycle
ON Every 10 cycles
19
Control Board
After 2nd freeze cycle
After 11th freeze cycle