28
Regulation and servicing
fo
r the technician
6. check that pressure upstream the boiler is: Natural Gas min.17-max. 25 mbar; check for gas
leaks;
7. repeat following regulations: Domestic Water Output (max. and min.), Slow Opening Pressure
and Heating Output, carefully reading the instructions given in the previous pages.
Combustion check
The boiler has a “CHIMNEYSWEEPER” function which draws the ignition of the burner to the
highest power (not modulated) without working on the room thermostat.
— Arrange the instruments for the combustion check;
— bring and keep the selector Summer/Winter in the “Chimneysweeper”
Position for at least 3
seconds, then let the selector return in the Summer
Position. The green lamp flashes
rapidly and the burner ignites at the maximum output, for a period sufficient to make the cheking
and the measurements. The produced heat is carried off by the heating system;
— to turn off the burner, turn the selector Summer/Winter in the central (0) position. The green
lamp flashes slowly.
REMARK: the burner will turn off automatically at the achievement of the system highest tempera-
ture and, however, after 15 minutes.
Draining heating system
and tank serpentine
— To correctly unload both the heating system and
the tank’s serpentine, the boiler must be switched
off and it is necessary to manually set three-way
valve in middle position as described here below:
•
three way valve (item 1 in figure) must be
initially in “sanitary” mode (manual control
spindle in position “S”). If it were in “R”
position turn the Summer/Winter selector
in Summer
position and wait until the
lever moves on S position;
•
switch boiler off and turn off its electrical power supply;
•
manually push spindle towards middle position, where it can
be blocked pushing towards inside (position “C”).
— Connect a rubber pipe to the heating system draining tap terminal
(item 2 in figure);
— put the other end of the pipe in a suitable drain or sink;
R
S
C
1
3
2
