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5c)
Initial Harvest Cycle Termination Diagnosis
: 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 and S5 dip switch 4). Check discharge line
temperature. For a thermistor check, see "II.G. Thermistor Check." If 1-min. fill cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.F. 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 based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.
NOTICE!
S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.
6)
Freeze Cycle – LED 1 is on.
Comp, FMR, and PM continue. LLV energizes. HGV and
X10 and X12 relays de-energize. Appliance is held in freeze by a 5-min. short cycle
protection timer. After 5-min. short cycle protection timer terminates and FS opens,
freeze cycle terminates.
Note: PM power supply switches from CB K1 #5 (DBU) in harvest to K1 #4 (R) in freeze.
Anti-Slush
: When anti-slush is enabled (S5 dip switch 5 "ON"), PM de-energizes when
thermistor reaches 36°F (2.2°C) (5.8kΩ) for 10 sec. then, energizes for the remainder of
the freeze cycle.
a)
Freeze Cycle Diagnosis
: Confirm Comp, FMR, and PM continue. Confirm that
LLV energizes. 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), LLV energizes, TXV and HM
operate correctly, Comp is efficient, and refrigerant charge is correct. See "VIII.A.
Specification and Performance Data."
b)
Comp and FMR Diagnosis
: If Comp. and FMR de-energize once freeze begins,
check that appliance has not shut off on HPS ("POWER OK" LED off). If so, check
"3)b) HPS Diagnosis" above. 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.
Comp
: If 115VAC is present, check for 115VAC at MC coil. If 115VAC is present,
check MC coil and contact continuity. Replace as needed. If MC is okay, check
Comp start relay, start and run capacitors (single phase), and 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."
FMR
: If Comp is energized but FMR is not, check for 115VAC at the FMR junction
box. If 115VAC is not present, check icemaker wiring connections. If 115VAC is
present, check for voltage at condenser unit. If 115VAC is not present, check field
wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and
fan blade for binding.
c)
WV and HGV Diagnosis
: If WV is energized, check for 115VAC at CB K1 #6 (O) to
neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB.
If 115VAC is not present, replace WV (bypassing). If HGV did not close at the end of
harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present and
LED 3 is off, replace CB. If 115VAC is not present, replace HGV (bypassing).
