Hoshizaki KMD-460MAJ 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 and LED 2 is on, 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. If WRV is leaking by, confirm HGV
is open and LLV is closed. Next, check for proper refrigerant pressures. If refrigerant
pressures are correct, adjust or replace WRV. See "IV.C. Water Regulating Valve
Adjustment (water-cooled model)."
e) CCH Diagnosis (remote model): Confirm X14 relay energizes, de-energizing the
CCH.
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