Hoshizaki KML-325MWJ Service Manual page 17

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
HGV, X10, X12, and X14 relays energize. CB monitors the warming of the evaporator
via the thermistor located on the suction line. 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). The harvest timer has settings of 60, 90, 120, and 180 sec.
The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles
with a pump-out (S4 dip switch 5). WV and X11 relay are energized during harvest for a
maximum of 6 min. or the length of harvest minus 50 sec., whichever is shorter. 50 sec.
before harvest terminates, PM energizes. See step 5b below.
a) Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp
energizes. If not, check for 115VAC at CB K1 #1 or #9 (V) to neutral (W). If 115VAC is
not present, check for 115VAC at CB K1 #7 or #10 (BK) to neutral (W). If 115VAC is
present at #7 or #10 (BK) and not at #1 or #9 (V), replace CB. If 115VAC is present,
check for 115VAC at CR solenoid. If 115VAC is present, confirm contacts are closed.
If not, replace CR. If CR contacts are closed, check Comp start and run capacitors,
Comp start relay, and Comp motor winding.
b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that HGV
energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC
is not present, replace CB. If 115VAC is present, check for 115VAC at HGV coil and
check HGV coil continuity. Replace as needed.
c) LLV Diagnosis: Confirm that LLV is de-energized and closed (not bypassing).
If energized, replace CB. If de-energized and bypassing, replace LLV.
d) WRV Diagnosis: Confirm WRV is not leaking by.
e) CCH Diagnosis (remote model): Confirm X14 relay energizes, de-energizing the
CCH.
5b) Harvest Pump Time – 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). 50 sec. before the harvest timer terminates,
LED 3 turns on and PM energizes. Comp, HGV, X10, X12, and X14 relays continue.
LED 4 turns off, WV and X11 relay de-energize.
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.
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