13 Weatherman function
14.1.4 Check system pressure
The water pressure in the heating system can be
read on the pressure gauge. As a rule of thumb (for
buildings of up to three storeys), the pressure should
be 1 to 2 bar for a cold system and 1.5 to 2.5 bar for a
hot system.
It is important that the pressure remains constant at
all times. A constant fall in pressure requires the addi-
tion of extra water and indicates a fault in the system
(e.g. a leak).
i
TIP: Make a note of the set system pressure
during initial commissioning.
Abb. 2-58_Position of pressure gauge
14.1.5 Clean flue gas pipe
►
Switch the boiler to
stop
operating mode and
leave to cool.
►
Loosen the 2 socket head screws
1
on the right
side of the boiler.
►
Lift the cover up and remove.
►
Remove the right-hand side panel.
►
Unscrew the M4x8 cylinder screws (TX20)
1
and
remove the ID fan (to protect against dirt, the rub-
ber seal can be reused).
The flue gas pipe is located between boiler and chim-
ney.
►
Remove cover
1
in the flue gas pipe.
►
Remove combustion deposits (e.g. dust, flue
ash) from the pipe.
►
Install parts in the reverse order.
14.1.6 Check safety valve
Carry out a visual check for leaks at the valve (inspect
around outlet of dump hose). Turning the valve cap is
not recommended, as the valve may not seal com-
pletely afterwards.
Information on safety valve
Operation manual
pelletelegance
37
