Yamato Scientific WG221S Water Purifiers - Manual (Page 21)

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Identification of Parts
Operation System
This drawing identifies WG221S operation system by the process.
(There are some different parts used for WG221.)
(1) Drain boiler water
●Turn the circuit breaker on and push the power switch ,then after 15sec. solenoid valve to drain
boiler water opens for about 40sec. and at the same time solenoid valve for cooling water opens
for about 30sec.
(2)Supply and distillation of boiler water
After finished boiler water drainage,
solenoid valve for raw water and solenoid valve for boiler
water opens at the same time ,and then water is supplied into boiler.
When float switch (to control the boiler water level) in the float receptacle finds water level
sufficient,
heater becomes on to start distillation.
Following water supply, when float switch controls water supply into the boiler by opening and
closing solenoid valve for raw water and solenoid valve for boiler water.