Yamato Scientific WS220 Water Purifiers - Manual (Page 20)

16
Maintenance Method
Washing Distiller
1. Water Drained from Boiler
Water in the boiler is condensed as the distillation continues, thus promoting the deposition of boiler
scale. To prevent this, open the front door once or twice daily (after every 5 - 8 hours of distillation),
and drain water via the boiler water drain cock in the front. After completing the drain of water, turn ON
the power switch to start supplying water. Close the cock after discharging water for 2 - 3 min. This
washes away the scale from the pipes effectively.
2. Washing Distiller
If large amount of boiler scale is deposited in the boiler or float tube, malfunction (non-load combustion)
could result. Check the unit once per month. Wash the boiler once in about 3 months. Do this more
often according to the water quality and operating hours.
Removal of Distiller
1. Turn OFF the power switch.
2. Open the front door.
3. Open the manual cock to drain the water from the boiler.
2-A) WS200 (See Fig. 5 on the next page.)
1. Raise the cover (Teflon tube) ⑧ for the heater terminal ⑫ on top of the boiler, and remove the lead
wire from the heater ④ by using Phillips screwdriver. In doing this, take care not to drop the heater
lead wire or terminal cover in the back until it is installed next.
2. Pull off the metal piece (same as ⑥ in WS220) fixing the boiler ① and condenser by loosening the
3 knurled screws (same as ⑦ in WS220).
3. Remove the silicone hoses and cap nuts from the boiler water drain port ⑨ and the boiler water
supply port ⑩. In doing this, pay attention to the dripping water.
4. When the screws fixing the boiler are removed by using Phillips screwdriver, the distiller (boiler) can
be removed.
NOTE) Packing is provided between the condenser and boiler. Store this with great care.
2-B) WS220 (See Figs. 5 on the next page and 5-1 on this page.)
The heater terminal ⑫ is connected to the
terminal block a in the upper frame. Remove the
locking screw c, terminal cover b and locking
screw d by using Phillips screwdriver, and remove
the lead wire of the heater.
Take the subsequent steps the same way as in
WS200.
NOTE)
• Packing is used in each connection. Take
care not to lose these packing when removing
components.
• Glass components and heater are easily
damaged. Handle these things with great
care. Do not try to fold or pull the heater or
lead wire more than necessary, either.
d
a
c
b
a Terminal Block
b Terminal Cover
c Locking Screw (for Locking
Terminal Cover)
d Locking Screw (for Locking Lead Wire)
Fig. 5-1