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4) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay (KM-1601SAH/3)
remain energized, Comp, FM/FMR, HGV, and X10 relay (KM-1601SAH/3) energize.
CBmonitors the warming of the evaporator via the thermistor located on the suction
line. When the thermistor reaches 48°F (9°C), CB reads a 3.9 kΩ signal 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 seconds.
KM-1601SAH/3 "G" CB: WV is energized during harvest for a maximum of
6 minutes or the length of harvest minus 50 seconds, whichever is shorter.
50seconds before the harvest timer terminates, LED 4 turns off, WV and X-11 relay
de-energize, LED3turns on and PM energizes for the last 50seconds of harvest.
CAUTION! S4 dip switch 7must remain in the factory default position of
7on. Otherwise, PM will not energize during the last 50 seconds of harvest.
Adjustment outside of the factory default position may result in damage to
the icemaker. PM is energized through CB K1 ten-pin connector pin #5 (DBU wire)
and the X10 relay.
KM-1601SWH/3, KM-1601SRH/3 "E" CB: WV is energized during harvest for a
maximum of 6 minutes or the length of harvest, whichever is shorter.
When the harvest timer terminates, the harvest cycle is complete. CB checks the
position of F/S and proceeds to the next cycle if it is closed, or calls for a 1-minute ll
cycle if it is open. The minimum total time allowed by CB for a complete harvest cycle is
2 minutes.
Diagnosis: Check that Comp, FM/FMR, HGV, and WV are energized. Average initial
harvest cycle at factory setting is 2 to 3 minutes. 1.5 minutes after initial harvest begins,
touch Comp discharge line. Is it hot? If not, check that Comp is energized, refrigerant
pressures are in range, HGV is energized and open, LLV is de-energized and closed. If
discharge line is hot, touch the inlet line to the evaporator. If discharge line is hot, place
a thermometer on the suction line next to the thermistor. Has it warmed to 48°F (9°C) or
warmer? Conrm thermistor status. See "IV.E. Thermistor Check."
KM-1601SAH/3 "G" CB: If temperature has been reached, check that WV and X-11
relay de-energize (LED 4 off) and PM energizes (LED 3on) to circulate water over
evaporator for the last 50seconds of harvest. If not, make sure S4dip switch 7 is
in the factory default position. Check CB K1 ten-pin connector pin #5 (DBU wire)
for 115VAC. Also check X10 relay. X10 relay and X10 relay terminal #4 must be
energized for PM to rotate in the proper direction.
All: If 1-minute ll cycle starts after the harvest timer terminates, see "IV.D. Float
Switch Check and Cleaning." If the thermistor reading is in proper range and CB
fails to terminate the harvest cycle and initiate the freeze cycle, CB is bad and must
be replaced.