
14
2. Before Using this unit
Requirements for Installation
WARNING!
23.
Essential Points for Initial Use
In the case of WG270, the quality of distilled water stored in the distilled water tank may be
worse than the A4 level quality temporarily because of contact with the atmospheric air.
WG270 is equipped with the function to recover the water quality of such pure water to the
A4 level by means of circulation under ultraviolet ray irradiation and removal of CO2 gas.
It may take hours for the distilled water stored in the tank after initial start of WG270 to reach
the A4 level water quality. Carry out cleaning of the tank inside as follows:
(1) Install and start operation of WG270 system. Keep operation till the tank is filled with
the distilled water.
(2) Discharge the distilled water totally from the outlet of distilled water tank.
(3) Start operation again and keep operation till the tank is filled with the distilled water.
(4) When the tank is full of the distilled water, continue operation without turning OFF power
supply (keep the distilled water circulating). In four or more hours, use the distilled
water. (This step is necessary for initial operation only).
A guideline is as follows. If the specific resistance of distilled water is maintained at 1.2
M
Ω
・
cm or more for one hour or more continuously, the distilled water with the A4 level or
higher water quality can always be sampled.
If the specific resistance of distilled water is less than 1.2MΩ
・
cm, continue operation
(keep the distilled water circulating) for approximately four hours or more before sampling
the distilled water.
When the distilled water has been stored for two weeks or more in the tank, drain the water
totally and start operation. Take steps (3) and (4) above before using the distilled water.
24. After installation
This unit may be turned over under unexpected earthquake or impact. Provide adequate
measures against such turn-over to ensure the safety.