28
Regulation and servicing
for the technician
Combustion check
The boiler has the “chimney-sweeper” function, forcing burner ignition at the maximum output not
modulated. This function allows more reliable measurements of those obtained when the gas boiler
is activated through the room thermostat or hot water demands.
— Prepare the instruments for combustion checking;
— activate the “chimney-sweeper” function, following this simple procedure, studied to avoid
accidental activations of the user;
• supply the boiler and turn the Summer/Winter knob
to Summer position
;
• provide that room thermostat contact is closed (activated) or open an hot water tap (the
heat produced by the boiler will be drained consequently);
• turn the Hot Water knob
to the position chimney-sweeper
and wait (about 5 seconds)
that green lamp
flashes with short lightnings. When this occurs, turn the Hot Water
knob
on the scale from I to IIIII. The burner ignites at the maximum output not modulated;
— make checkings and measurements;
— switch off the burner, by turning the Summer/Winter knob
to the
“0”
position. The green
lamp
flashes with long lightnings.
Remark: the burner will switch off automatically when reaching the maximum temperature, and in
any case after 15 minutes.
Hydraulic section
DOMESTIC HOT WATER FLOW ADJUSTMENT
The boiler is checked and adjusted prior to leaving the factory. However, after installation, it is
advisable to check the settings. To carry out adjustments, proceed as follows:
— Open a domestic hot water tap to maximum flow position.
— Hold a water flow gauge under the tap.
— Adjust water flow to the required flow rate, acting on the adjustment screw (item 12 in the
“Components of the gas boiler” figure).
PUMP’S SPEED
The pump has a selector which allows to reduce the speed, so as to reduce the noise produced by
the too rapid circulation of the liquids in too small heating systems.
III = Maximum
Speed (Firm Set up)
II
= Medium
Speed
I
= Minimum
Speed
772
R01
