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 (S1 dip switch 1 & 2)
Legend: Comp–compressor DV–drain valve FM–fan motor FS–oat switch HGV–hot gas 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 and cleaning valve. This operation is used circulate and sanitizer over both the inside and outside surfaces of the evaporator.
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. (KM-81, 161) or 10 sec. (KM-116) (S1 dip switch 7), whichever is shorter. Do not adjust S1 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
(S1 dip switch 9 & 10)
FS in control
4. Pump-Out Cycle
• Factory set for every
10th cycle (S1 dip switch 5 & 6)
• Pump motor stops for
2 sec., then restarts for 10/20 sec. (S1 dip switch 3 & 4)
WV energized
FS open
Comp energized HGV energized WV energized DV de-energized
Thermistor temperature reaches 48°F (9°C) (3.9 kΩ or less). Harvest timer starts.
FS open
Comp energized FM energized PM energized HGV de-energized
FS closed
Comp energized HGV energized DV energized PM de-energizes for 2 sec., then restarts for 10/20 sec. FM de-energized
FS check
Startup
If FS is open, Comp stops and cycle returns to 1-Min. ll.
Thermistor reaches 36°F (2°C) 5-min. min. freeze timer starts
FS closed
FS opens or freeze timer terminates
30 sec. or 50 sec.
PM energized WV de-energized
Harvest Pump Timer
Slush Control Thermistor reaches 41°F (5°C 4.8 kΩ) PM de-nergizes for 10 sec. then energizes
5-min. min. freeze timer