9
Safety equipment block for 108 to
144 kW
A
Pressure gauge
1.
Check that the installation room vent
is open.
2.
Check the pre-charge pressure of the
expansion vessel.
If the pre-charge pressure of the
expansion vessel is lower than the
static system pressure, top up with
sufficient nitrogen to make the pre-
charge pressure higher than the
static system pressure (0.1 to
0.2 bar/10 to 20 kPa).
3.
Open any installed check valves.
4.
Fill the heating system with water and
vent it until the charge pressure at the
pressure gauge is higher than the
pre-charge pressure of the expan-
sion vessel (0.1 to 0.2 bar/10 to
20 kPa).
Minimum system pressure 0.8 bar
(8 kPa), permiss. operating pressure
3 bar (0.3 MPa).
5.
Return the check valves to their oper-
ating position.
Checking the gas type
The boiler is factory set for
natural gas E.
Note
The boiler can be operated in the Wobbe
index range 12.0 to 16.1 kWh/m
3
(43.2
to 58.0 MJ/m
3
).
1.
Check the gas type and Wobbe index
with your gas supply utility or your
LPG supplier and compare them with
the details on the burner label.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 704 GB
