Service Manual

15
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMRs, HGVs, and X10 relay 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 and S5 dip switch 4). WV and X11 relay are energized during
harvest for a maximum of 6 min. or the length of harvest minus HPT setting (S4 dip
switch 6), whichever is shorter. See step 5b below.
a) Comp Diagnosis: Check that evaporator is warming. Ifnot, conrm that Comp
energizes. If not, check for 115VAC at CB K1 #1 (V) to neutral (W). If 115VAC is not
present, check for 115VAC at CB K1 #10 (BR) to neutral (W). If115VAC is present
at #10 (BR) and not at #1 (V), replace CB. If 115VAC is present, check for 115VAC
at MC solenoid (SRK). If 115VAC not present, check wire harness connections.
If115VAC is present, conrm contacts are closed. If not, replace MC. If MC contacts
are closed, check Comp start and run capacitors, start relay (single phase), and
Comp motor winding.
b) HGVs Diagnosis: If Comp is energized and evaporator is not warming, check
that HGVs energizes and open. 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
HGVs coil (KMS and SRK) and check HGVs coils continuity. Replace as needed.
c) LLVs Diagnosis: Conrm that both LLVs are de-energized (KMS and SRK) and
closed (not bypassing). Ifenergized, replace CB. If de-energized and bypassing,
replace LLVs (KMS and SRK).
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 and S5 dip switch 4). When WV de-energizes,
LED 4 turns off, X11 relay de-energizes and LED 3 turns on. PM and X12 relay energize.
Comp, FMRs, HGVs, and X10 relay continue.
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.G. Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does
not energize before harvest terminates, replace CB. If WV continues, check for 115VAC
at CB K1 #6 (O). If115VAC is present, and LED 4 is off, replace CB. If 115VAC is not
present, and WV continues, check WV diaphragm for leaking by. Clean or replace.
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) to neutral (W) and X10 relay terminal #6(Y) to
neutral (W). If 115VAC is present on terminal #4(P) and not on terminal #6(Y), replace
X10 relay. If 115VAC is present on X12 relay terminal #8 (P) and PM is not energized,
check for 115VAC at X12 relay terminal #4 (W/R) to neutral (W) and terminal #6 (DBU)
to neutral (W). If 115VAC is present on terminal #6(DBU) and not on terminal #4 (W/R),
replace X12relay. If 115VAC is present on X12relay terminal #4(W/R). If 115VAC is
present between X12 relay terminal #4 (W/R) and neutral (W), check PM capacitor and
motor winding continuity.