Service Manual

13
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. Operation Flow Chart
FS check
1 to 3-min. harvest timer in control (S4 dip switch 1 & 2)
Legend: BC–bin control Comp–compressor DV–drain valve FM–fan motor FMR–fan motor-remote FS–oat switch HGV–hot gas valve LLV –liquid line valve PM–pump motor WV–inlet water valve
Components Energized when the Control Switch is in the "PUMP" Position When the control switch is in the "PUMP" position power is supplied to the pump motor. Water tank contents then ows over the outside of the evaporator plate assembly. Note: Water tank contents does not ow inbetween the evaporator plates.
Operation Flow Chart
1. 1-Minute
Fill Cycle
Cycle Steps
2. Harvest Cycle
• WV time: 6 min. or the length of harvest minus 50 sec.
(S4 dip switch 7), whichever is shorter. Do not adjust S4 dip switch 7 out of the factory position.
• Max. harvest time: 20 min.
Thermistor in control
3. Freeze Cycle
• Min. freeze time: 5 min. • Max. freeze time: freeze timer setting (S4 dip
switch 9 & 10)
• Freeze-Time monitoring for Freeze-Time
Correction starts at 2nd freeze cycle.
FS in control
4. Pump-Out Cycle
• Factory set for every 10th
cycle (S4 dip switch 5)
• Pump motor stops for
2 sec., then reverses for 10/20 sec. (S4 dip switch 3 & 4)
WV energized
FS open
Comp energized FMR energized HGV energized WV energized
Thermistor temperature reaches 48°F (9°C) (3.9 kΩ or less). Harvest timer starts.
FS open
Comp energized FM energized FMR energized PM energized LLV energized HGV de-energized
FS closed
Comp energized DV energized FMR energized HGV energized PM de-energizes for 2 sec., then energizes for 10/20 sec. FM de-energized LLV de-energized
FS check
Startup
If FS is open, Comp stops and cycle returns to 1-Min. ll.
5-min. minimum freeze timer in control
FS closed
FS opens or freeze timer terminates
50 sec.
PM energized WV de-energized
Harvest Pump Timer
Anti-Slush Thermistor temperature reaches 36°F (2.2°C) (5.8 kΩ). PM de-energized for 10 sec.
Freeze Time Differential Exceeded. Initiate Freeze-Time Correction Cycle. See "II.A.3. Freeze-Time Correction Cycle.
Components Energized when the Control Switch is in the "ON" or "PUMP" position and the Mode Switch is in the "CLEAN" Position
• When the control switch is in the "ON" position and the mode switch is in the "CLEAN" position power is supplied to the control board K9 connector. The control board
then initiates a clean/sanitze program. See the maintenance label on the top cover or the instruction manual for details.
• When the control switch is in the "PUMP" position and the mode switch is in the "CLEAN" position, only the pump motor energizes and circulates water tank contents
over outside of evaporator plate assembly as the control board power supply has been disconnected. The Clean/Sanitize program cannot initiate in this scenario.