Service Manual

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5b) Harvest Pump Timer – 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turns on and PM energizes. Comp, FMR, HGV, and X10 relay continue.
LED4turns off, WV and X11 relay de-energize.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it
warmed to 48°F (9°C) or warmer? Conrm thermistor status. See "II.F. Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and WV
continues, check for 115VAC at CB K1 #6 (O). 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). If115VAC is not present, replace CB. If 115VAC is present and PM is not
energized, check for 115VAC at X10relay terminal #8 (Y) to neutral (W). If 115VAC
is not present, check for 115VAC at X10 relay terminal #4 (P) and X10 relay terminal
#6(Y) to neutral (W). If 115VAC is present at terminal #4(P) and not at terminal
#6(Y), replace X10 relay. If 115VAC is present on X10 relay terminal #8 (Y) and PM is
not energized, check for 115VAC at X10 relay terminal #3 (R) and X10 relay terminal
#5(DBU) to neutral (W). If 115VAC is present at X10 relay terminal #5(DBU) and not at
X10 relay terminal #3 (R), replace X10 relay. If 115VAC is present at X10relay terminal
#3 (R), check control switch contact continuity between control switch terminals
#6(R) and control switch terminal #5(Y). Ifcontacts are open, replace control switch.
Ifcontacts are closed and 115VAC is present between control switch terminal #5 (Y)
and neutral (W), 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. Check discharge line temperature. For a
thermistor check, see "II.F.Thermistor Check." If 1-min. ll 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, FMR, and PM continue. FM and LLV energize.
HGV and X10 relay 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.
Note: PM power supply switches from CBK1 #5(DBU) in harvest to K1 #4 (R) in freeze.
a) Freeze Cycle Diagnosis: Conrm Comp, FMR, and PM continue. Conrm that
FM and LLV energize. Conrm WRV opens. Next, conrm HGV and X10 relay
de-energize. During the rst 5 min. of freeze, conrm evaporator is cooling. If not,
conrm WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV
and FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient,
and refrigerant charge is correct. See "VIII.A. Specication and Performance Data
Sheets."