MAINTENANCE INSTRUCTIONS
26
4
AIR VENT VALVE PLUG
PUMP PLUG
AIR VENT VALVE
3
2
1
3 bar
1.5 bar
0.5 bar
1.2 bar
GREEN AREA
M
R
4.2 Filling the system
Check the properties of the water supply and install the
appropriate treatment devices if the mains water has a
hardness rating more than 25 °f i
n
order to prevent
scaling and eventual damage to the D.H.W heat
exchanger.
Use only clean tap water to fill the system.
Once the water pipes have been connected, close the gas feed
valve and fill the system as follows:
•
Check that the circulation pump runs freely.
•
Check that the plug of the air vent valve has been slackened
slightly to allow air to escape from the system (fig.1).
•
Open the filling tap
R
(fig. 2), use the pressure gauge
M
(fig.2)
to check that the systems pressure reaches the middle of the
green area (equal to 1,2 bar, see fig. 3).
•
On completion, make sure that the filling tap R is perfectly
closed.
•
Unscrew the plug on the pump to remove any trapped air,
check that the pump is free then re-tighten it when water starts
to flow out.
•
Open the air vents on the radiators and monitor the air
evacuation process. When water starts to flow out of the
radiators, close the air vents.
•
If, after the above operations, there is a reduction in the
pressure, re-open the filling tap
R
until the pressure gauge
reads 1,2 bar (fig.3).
Important:
The working position of the 3-way valve is indicated by
the colour (Red or Blue), visibble in the inside of the valve. (fig. 4).
•
The RED colour
indicate the operation in the Domestic
Hot water mode.
•
The BLUE colour
indicate the operation in Heating
mode.