12
①
②
③
①
Safety valve
②
Regulator
③
Filter
Drainage
Installation Mode 3 of the Tap Water Safety Valve (Inlet Water Pressure>0.5MPa)
A pressure maintaining valve is required in the installation mode 3 to make sure the water tank pressure keep
within 0.3~0.5MPa. The arrow direction of the pressure maintaining valve should be the same as the water flow.
Note: the filter, safety valve, check valve, pressure maintaining valve, cut-off valve and hose for installation are
not delivered with the main unit and should be prepared by the client.
7. Maintenance of the Water Tank
7.1 Water charging and draining
(1)
Operation process for water charging
•
Cut off the power supply and open the cut-off valve at the water inlet of the tap faucet;
•
Open the cut-off valve at the hot water drain outlet and valve in user water use site;
•
Close the valve in user water use site when water is flowing out from user water use site;
•
Complete water input operation and reenergize the unit.
(2)
Operation process for water draining
•
Cut off the power supply and close the cut-off valve at the water outlet of the tap faucet;
•
Open the cut-off valve at the hot water drain outlet and valve in user water use site;
•
Open the cut-off valve on the joint (3-way) pipe;
•
Close the drainage cut-off valve after draining water on the water tank to complete drainage operation.
7.2 Periodic cleaning for water tank
Please clean the water tank periodically to get good-quality water according to the following steps:
(1)
Cut off the power supply.
(2)
Close the cut-off valve at the water inlet of the water tank.
(3)
Open the cut-off valve at the hot water drain outlet and valve in user water use site.
(4)
Open the cut-off valve in joint (3-way) connector, and wait for drainage of water inside water tank.
(5)
Close the cut-off valve in joint (3-way) connector, open the cut-off valve at the water inlet of the water tank,
close the cut-off valve at the water inlet when water flows from user water use site, then reopen the cut-
off valve in joint (3-way) connector, repeat the drainage operation, close the cut-off valve in joint (3-way)
connector when water discharged is clean.
(6)
Conduct water input for the water tank according to water input operation.
(7)
Water tank cleaning completed and energize it.
7.3 Requirements on water quality
Paramete
Parametric value
Unit
pH( 25°C)
6.8~8.0
/
Cloudy
＜
1
NTU
Chloride
＜
50
mg/L
Fluoride
＜
1
mg/L
Iron
＜
0.3
mg/L
Sulphate
＜
50
mg/L
SiO
2
＜
30
mg/L
Hardness(count CaCO
3
)
＜
70
mg/L
