Hoshizaki KM-1301SAH/3 Service Manual page 51

5) Freeze Cycle – LED 1 is on. Comp and FMR remain energized, PM energizes
or remains energized depending on harvest pump timer (S4 dip switch 7) setting.
FM and LLV energize. HGV, and X1 relay (auxiliary code T-0, U-0), X10 relay
(auxiliary code U-1 and later) de-energize. The unit is held in freeze by a 5-minute
short cycle protection timer (CB will not accept a signal from F/S). After the 5-minute
short cycle protection timer expires, CB turns freeze termination over to F/S. During
the first 5 minutes of freeze, confirm that the evaporator temperature drops. After
5 minutes in freeze, disconnect black F/S connector from CB BLACK K5 connector.
After a 15 second delay, the unit should switch out of the freeze cycle. Diagnosis: If
the evaporator is not cold, check to see if HGV is still open or if TXV is not opening
properly, if WV is continuing to fill the reservoir, if there are improper unit pressures,
an inoperative Comp, or an inoperative HM. If the unit switches out of freeze with F/S
connector removed, but would previously not switch out of freeze with F/S connected
(long freeze - 3 beep alarm), F/S may be sticking. To check and clean F/S, see "IV.
D. Float Switch Check and Cleaning." If the unit remains in freeze longer than 15
seconds after disconnecting black F/S connector, replace CB. See "V.P. Removal and
Replacement of Control Board."
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and
conditions. Cycle times and pressures should follow performance data provided
in this manual. See "III.C. Performance Data."
6) Pump-Out Cycle – (10/20 second pump-out) – LEDs 1, 3, and 2 are on. LED 4 is on
when S4 dip switch 3 & 4 are set to 3 off and 4 on. CAUTION! Do not adjust S4 dip
switch 3 & 4 to 3 off and 4 on. Adjustment to this position on this model prevents
the unit from operating correctly and may cause damage. For details, see "II.
C.3.c) Pump-Out Timer (S4 dip switch 3 & 4)." Comp and FMR remain energized, HGV
energizes. WV energizes if S4 dip switch 3 off and 4 on. LLV and FM de-energize.
PM stops for 2 seconds, then reverses for 10/20 seconds depending on pump-out
timer S4 dip switch 3 & 4 setting. When the pump-out timer expires, the pump-out
is complete. The pump-out frequency control is factory set for every 10th cycle, and
generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump-out frequency can be adjusted.
The pump-out frequency control (S4 dip switch 5 & 6) can be set to have a pump-out
occur every cycle, or every 2, 5, or 10 cycles. For details, see "II.C.3.d) Pump-Out
Frequency Control (S4 dip switch 5 & 6)."
Timing of the first pump-out is dependent on S4 dip switch 5 & 6 settings. See the table
below
S4 Dip Switch Setting
No. 5 No. 6
OFF OFF
ON OFF Every 2 cycles
OFF ON Every 5 cycles
ON ON Every 10 cycles
Pump-Out
1st Pump-Out
Frequency
Every cycle After 2nd freeze cycle
After 3rd freeze cycle
After 6th freeze cycle
After 11th freeze cycle
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