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 CB–control board Comp–compressor FM*–fan motor FMR–fan motor-remote FS–oat switch HGV–hot gas valve HPT–harvest pump time LLV –liquid line valve PM–pump motor WV–inlet water valve
Components Energized when the Control Switch is in the "WASH" Position The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner and sanitizer ow over both the outside and the inside of the evaporator plate assembly. Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control switch is placed in the "ICE" position.
Operation Flow Chart
1. 1-Minute
Fill Cycle
Cycle Steps
2. Harvest Cycle
• WV time: 6 min. or the length of harvest minus HPT
setting (S4 dip switch 6), whichever is shorter.
• 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).
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 FM*/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 FM*/FMR energized HGV energized PM de-energizes for 2 sec., then reverses 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 Time
Anti-Slush Thermistor temperature reaches 36°F (2.2°C) (5.8 kΩ). PM de-energized for 10 sec.
CB: 2A7664-02 When freeze time differential exceeded, freeze-time correction cycle starts. See "II.A.3. Freeze-Time Correction Chart."
FM* – FM energized in 2. Harvest Cycle and 4. Pump-Out Cycle when connected to CB K1 connector pin #9.