53
Filling the system
The central heating installation needs
to be filled with potable water according
to the requirements in chapter ‘Water
quality’. When the boiler has been
electrically commissioned, then the
heating system can be filled. For filling
or topping up the installation use the
following procedure:
1. Connect a filling tap to the return
of the hydraulic circuit and open it.
2. Connect a hose on the manual
deaerator (A) and open it to
remove the air.
3. Close the manual deaerator
when water is constantly coming
out from it.
4. Slowly fill the central heating
system up to 1.5 – 2 bar, Digital
pressure reading is shown in the
middle of the Home screen.
5. Close the filling tap.
6. Vent the entire heating installation
starting at the lowest point.
7. Check the water pressure and top
up if necessary to 1.5 – 2 bar.
8. Disconnect the filling tap from the
hydraulic circuit.
When powering up the boiler an
automatic air purge program will run
to vent the boiler (‘Airpurge active’).
This will last for approximately 7
minutes. During this program the
pressure in the central heating needs
to be checked, and when necessary,
topped up again.
It may take some time before all the
air has disappeared from a filled
installation. Certainly during the
first week sounds may be audible
that indicate air. The automatic air
vent (B) in the boiler will let this air
escape, causing the water pressure
to drop during this period and water
will need to be refilled again.
Hot water supply
Fill the hot water supply by opening the
cold mains isolation valve.
Bleed the hot water installation by
opening all hot water taps one at a
time. Leave each tap to run until all air
has disappeared from the supply.
Flush with a minimum of 10 litres to
rinse any residual contaminants from
the hot supply and boiler.
Installation
Filling the system
25/03/19 09:00
–10°
1.5 bar
CH Pump Overrun
1
2
T10
BMS
32°
A
B
