Yamato Scientific WG221S Water Purifiers - Manual (Page 43)

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Maintenance
Cleaning Still
Removal the still
7.(1) Pull the heater terminal from the grommet.
But do not bend or pull leads from heaters beyond the necessity.
(2) Remove the two screws of band for boiler fixed by cross screwdriver, and take off the boiler
condenser.
(3) Loosen the three rolled screw of metal fittings connection, and remove the boiler condenser.
Cleaning the boiler
1. Preparing scale detergent
(1) Prepare hot water with temperature between 50 and 60 ℃ about 2 liters.
(2) Mix well “Organosol 10” about 200g, an accessory for this unit, and hot water prepared (1).
2. Stop the hose joint in the lower part of the boiler (outlet/drain of boiler) by rubber stopper etc.
3. Set the boiler at the stable place not to pour scale detergent from the boiler.
4. Pour the scale detergent from joint into the condenser with the heater connected.
5. Almost all scales are removed in about 4 to 5 hours. Drain the scale detergent from the boiler. If a lot of
scales in the boiler are not removed, add new scale detergent to repeat cleaning.
(1) If you finished removing the scales, take off the heaters from the boiler and wash them thoroughly by
the tap water. Wash them in the big beaker with full of water not to be wet of leads and drain.
Do not wash them by the tap water directly.
(2) If solid scales is not removed by the scale detergent, do the following treatment.
Boiler : Wipe off by brush etc.
Heater: Wipe off by soft material like chip or plastic etc.
The scales in the heater must be wiped equally and the solid scales must not be left partly. Extremely
the part only become a large heat resistance, therefore the heater may be broken.