25
180 seconds. WV is energized during harvest for a maximum of 6 minutes or the length
of harvest minus 50 seconds, whichever is shorter. 50 seconds before the harvest timer
terminates, LED 4 goes off WV de-energizes, LED 3 comes on and DVR energizes,
energizing PM for the last 50 seconds of harvest.
CAUTION! S4 dip switch 7 must
remain in the factory default position of 7 on. Otherwise, PM will not energize
during the last 50 seconds of harvest.
The minimum total time allowed by CB for a
complete harvest cycle is 2 minutes. 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 fill cycle if it is open.
Diagnosis:
Check that Comp, FMRs, and HGVs energize. WV is energized during
harvest for a maximum of 6 minutes or the length of harvest minus 50 seconds (Harvest
Pump Timer (S4 dip switch 7)), whichever is shorter. 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, HGVs are energized and open, LLVs are de-energized and closed. 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? Confirm thermistor status. See "IV.E. Thermistor
Check." If temperature has been reached, check that WV de-energizes (LED 4 off) and
DVR energizes (LED 3 on), energizing PM to circulate water over evaporator for the
last 50 seconds of harvest. If not, make sure CB S4 dip switch 7 is in the factory default
position. Check CB K1 connector Pin #5 (DBu wire) and DVR solenoid for 115VAC. If
1-minute fill cycle starts after harvest, 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.
5)
Freeze Cycle – LED 1 is on.
Comp, FMRs, and PM remain energized. LLVs energize,
HGVs de-energize. The unit is held in freeze by a 5-minute short cycle protection timer
(CB will not accept a signal from F/S during the first 5 minutes of freeze). After the
5-minute short cycle protection timer terminates, CB turns freeze termination over to
F/S.
Diagnosis:
Check that Comp, FMRs, and PM continue. Confirm that evaporator
temperature drops. If not, confirm that LLVs have energized and are open. Make sure
WV and HGVs are de-energized and closed. Next, confirm proper unit pressures and
TXV operation, check for an inoperative HM, or an inefficient Comp. After 5 minutes
in freeze, disconnect black F/S connector from CB BLACK K5 connector. After a
15 second delay, the unit should switch out of the freeze cycle. If the unit switches out
of freeze with F/S connector removed, but would previously not switch out of freeze with
F/S connected (long freeze - 3 beep alarm), F/S may be sticking. To check and clean
F/S, see "IV.D. Float Switch Check and Cleaning." If the unit remains in freeze longer
than 15 seconds after disconnecting black F/S connector, replace CB. For short freeze
cycle, check that reservoir is full at beginning of freeze, DV is de-energized and closed,
and drain plug and stand pipe are in and not leaking.
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and
conditions. Cycle times and pressures should follow performance data provided in
this manual. See "III.C. Performance Data."