Yamato Scientific WS220 Water Purifiers - Manual (Page 22)

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Maintenance Method
Washing Method
1. Adjustment of Washing Solution
Prepare about 2 liters of hot water at 50 - 60℃ for WS200, and about 1.5 liters for WS220.
Add about 200 g (WS200) or 150 g (WS220) of the attached scale-washing agent to this hot water, and
stir thoroughly (standard: 8 - 10%).
2. Washing Method
1. Wash the boiler ① with water. Never wet the heater terminal with water.
2. Insert the attached rubber plugs (2 pcs) into the boiler water drain port ⑨ and the boiler water
supply port ⑩.
3. Put the boiler in the bucket, etc., and stand it almost vertical, and then supply the washing solution
prepared in "1. Adjustment of Washing Solution" into the boiler by way of the boiler steam port ⑪.
Most of the boiler scale will be eliminated in 4 to 5 hours. If large amount of scale is deposited, add
the washing solution newly, and repeat washing, or tray washing with brush.
4. When the washing of scale is completed, drain the solution (First, neutralize the solution with the
counteragent such as sodium hydroxide, and then drain), and remove the rubber plugs. Next, wash
this with water thoroughly until it gets neutral. In doing this, too, take care so that the heater
terminal may not get wet with water.
NOTE)
• Wash the boiler and heater as soon as possible. The more scale is deposited, the more difficult it
is to remove such scale. Amount of distilled water sampled may be reduced, or the heater may be
damaged.
• If the condenser or float tube is fouled badly, wash it similarly. As in washing the boiler, supply the
washing solution 4 to 5 hours before. Most of the scale will be eliminated.
• After completing the washing, drain the washing solution outside, and neutralize by using
counteragent. In such neutralizing operation, use pH test paper, etc. to check neutrality (main
ingredient: sulfamic acid).
• In storing this washing agent, seal the container to avoid high temp. and high humidity, and store it
at a dark place.
• When handling this washing agent, wear protective tools (gloves, mask, goggles, etc.).
• If any part of human body comes in contact with the washing agent, wash such part with clean water
thoroughly.
• Empty container must not be used to contain drinks.
• Since this causes rice plant to wither, do not flow the washing agents into the agricultural waterway
of paddy fields.
3. Installation of Distiller
Install the distiller in the reversed order of removal procedure after wiping off the water from the outside
of the boiler. Pay appropriate attention to the following points:
• If any locking screw connecting heater is loose, burning accident may result. Take appropriate care
even after connection.
• Check if the hose and packing are inserted into each joint.
• Check if the boiler water drain cock is closed.