E-
20
Charging water
After installation is completed the following procedures
shall be used to charge water into the hydro unit.
Connect water lines to water connections of hydro unit.
The air-vent valve shall be opened at least 2 turns and drain
valves shall be closed.
Open the service valve in the water supply connection.
Water pressure of supply line shall be over 2.0 bar for good
charging work.
Stop water supply when the pressure gauge of hydro unit
indicates 2.0 bar.
Service space should be secured.
Water pipe and connections must be cleaned using water.
If internal water pump capacity is not enough, install
external water pump.
Do not connect electric wire while water charging.
When initial installation or re-installation required, open
the cap to prevent air trap in the unit while charging
water.
The back-up heater vessel shall be full of water before
heater is turned on. Confirm if the vessel is empty by
opening the pressure relief valve of hydro unit.
(OK if water is flowing out)
It is recommended to install the make-up water
assembly to feed small quantities of water to the system
automatically, replacing the minor water losses and
maintaining the system pressure.
This assembly usually consists of a pressure-reducing
valve, water filter, check-valve and shut-off valves.
In this case, Check-valve must be installed to prevent
from contaminating city water.
Pipe work (Continued)
WATER
OUTLET
WATER
INLET
Liquid
pipe
Gas
pipe
Cap
Air-vent valve
NH080PHXEAHydro unit_IM_E 32659-1.indd 20
2010-07-28 ｿﾀﾈﾄ 8:59:27
