Hoshizaki KML-325MWJ Service Manual page 18

d) Control Switch Diagnosis: If 115VAC is present at X10 relay #3 (R), check for
115VAC at control switch #6 red (R) wire to neutral (W). Next, check for 115VAC at
control switch #5 (Y) to neutral (W). If 115VAC is present at control switch #6 red (R)
wire 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 harvest timer (S4 dip switch
1 & 2) terminates, harvest cycle terminates. 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 2 min.
Maximum harvest time allowed is 20 min.
IMPORTANT! S4 dip switch 7 must remain on. Otherwise, PM will not energize
during the last 50 sec. of harvest.
6) Freeze Cycle – LED 1 is on. Comp, PM, and X14 relay continue. FMR, FM, and
LLV energize. HGV, X10, and X12 relays de-energize. Appliance is held in freeze by a
5-min. short cycle protection timer. After 5-min. timer terminates and FS opens, freeze
cycle terminates. When the thermistor reaches 36°F (2.2°C), CB reads 5.8 kΩ from the
thermistor and de-energizes the PM for 10 sec. (anti-slush). After 10 sec. CB energizes
PM and freeze cycle continues.
Note: PM power supply switches from CB K1 #5 (DBU) in harvest to K1 #4 (R) in freeze.
a) Freeze Cycle Diagnosis: Confirm Comp, PM, and X14 relay continue. Confirm
that FMR, FM, and LLV energize. Confirm WRV opens. Next, confirm HGV, X10,
and X12 relays de-energize. During the first 5 min. of freeze, confirm evaporator is
cooling. If not, confirm WV de-energized (not leaking by), HGV de-energized (not
bypassing), FM, FMR, and LLV energize, TXV and HM operate correctly, WRV
opens, Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specification
and Performance Data Sheets."
When the thermistor reaches 36°F (2.2°C), CB reads 5.8 kΩ from the thermistor and
de-energizes the PM for 10 sec. then, energizes PM for the duration of the freeze
cycle.
b) Comp Diagnosis: If Comp de-energizes once freeze begins, check that appliance
has not shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS Diagnosis."
If "POWER OK" LED is on, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral
(W). If 115VAC is not present and LED 1 is on, replace CB. If 115VAC is present,
check for 115VAC at CR coil. If 115VAC is present, check CR coil and contact
continuity. Replace as needed. If CR is okay, check Comp start relay and start and
run capacitors. Next, check Comp motor winding continuity. If Comp is energized but
evaporator is not cooling, check for an inefficient Comp. See "VIII.A. Specification
and Performance Data Sheets."
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