Service Manual

14
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMR, HGV, 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) or #9 (V) to neutral (W).
If115VAC is not present, check for 115VAC at CB K1 #7 (LBU) or #10 (LBU) to
neutral (W). If115VAC is present at #7 (LBU) or #10 (LBU) and not at #1 (V) or
#9(V), replace CB. If 115VAC is present, check for 115VAC at CR solenoid. If 115VAC
is present, conrm 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: Conrm that LLV is de-energized and closed (not bypassing).
Ifenergized, replace CB. If de-energized and bypassing, replace LLV.
5b) Harvest Pump Time (Harvest Assist) – 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 energizes. Comp, HGV, 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.F. 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 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 #7 (Y) to neutral (W). If 115VAC is not present, check for 115VAC at X10 relay
terminal #3 (P) to neutral (W) and X10 relay terminal #5 (Y) to neutral (W). If 115VAC is
present on terminal #3(P) and not on terminal #5 (Y), replace X10 relay. If 115VAC is
present on X10 relay terminal #7 (Y) and PM is not energized, check for 115VAC at X10
relay terminal #4 (R) to neutral (W) and terminal #6 (DBU) to neutral (W). If 115VAC is
present on terminal #6(DBU) and not on terminal #4 (R), replace X10relay. If 115VAC
is present on X10relay terminal #4 (R), check control switch contact continuity between
terminals #4(R) and #5(R). Ifcontacts are open, replace control switch. If contacts are
closed and 115VAC is present between control switch terminal #5(R) and neutral (W),
check PM capacitor and motor winding continuity.