Service Manual

13
"G" Control Board without Harvest Pump Timer Operation Flow Chart
1. 1-Minute Fill
Cycle
2. Harvest Cycle 3. Freeze Cycle
4. Pump-Out Cycle
Cycle Steps
WV Energized
FS open
FS closed
Comp energized FMR energized HGV energized WV energized LLV de-energized
Thermistor temperature reaches 48°F (9°C) (3.9kΩ or less) Harvest timer starts (1 to 3 min.).
FS open
Comp continues FMR continues FM energized LLV energized PM energized HGV de-energized WV de-energized
FS closed
Comp continues FMR continues HGV energized PM de-energizes for 2 sec., then DV and PM energize for 10/20 sec. FM de-energized LLV de-energized
FS Check
FS Check
• Maximum inlet water valve time: 6 minutes • Maximum harvest time: 20 minutes
Thermistor in control
1 to 3 min. harvest timer in control (S4 dip switch 1 & 2)
• Min. freeze time: 5 min. • Max. freeze time: freeze timer setting (S4 dip switch 9 & 10)
5 min. minimum freeze timer in control
FS in control
If FS is open, Comp stops and cycle returns to 1-min. ll.
Legend: 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 "SERVICE" Position When in the "SERVICE" position, the control switch supplies power to the service switch and the machine is in service mode. The service switch has three positions: "DRAIN," "CIRCULATE" and "WASH." See the information below for details of each function.
DRAIN
Power is supplied to the pump motor and drain valve. This drains the water tank.
CIRCULATE
Power is supplied to the pump motor only. This can be used to circulate cleaner over the outside surface of the evaporator for extended periods of time.
WASH
Power is supplied to the pump motor and wash valve. This is used to circulate cleaner and sanitizer over both the inside and outside surfaces of the evaporator.
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. "G" Control Board without Harvest Pump Timer Operation
• Every 1, 2, 5, or 10
cycles (S4 dip switch 5 & 6)
• Pump motor stops for
2 sec., then energizes for 10/20 sec. (S4 dip switch 3 & 4)
FS opens or freeze timer terminates
Startup Shutdown and Restart See "II.A.3. Thermostatic and Mechanical Bin Control Shutdown Operation"