21
the device, where applicable, is tested for
tightness.
- That the gas line meets all applicable
legislation and regulations, in particular: That
a gas shut-off valve is installed immediately
before the device. This must have a YELLOW
valve handle and must be placed in a position
which allows full access to it.
Commissioning / periodically:
- Check that the above specifications have
been maintained and that the boiler is in
perfect working order.
- Check the dynamic pressure of the mains
gas supply.
- Check the gas pressure at the burner while
running the boiler at various levels.
GAS PRESSURE CHECK
CHECKING THE PRESSURE AT THE BURNER
- Remove the iron cover by loosening the 4
fastening clips
- Free up access to the gas valve by rotating
the instrument panel to the open position
- Remove the gas regulation valve screws
protection cap by applying leverage near
the mark
- Loosen the screw holding the pressure outlet
upstream of the regulator and connect it with
silicone tubing to the + input of a differential
manometer with an appropriate range (at
least)
- Check that all preliminary indications and checks
specified have been carried out.
- Disconnect a cable from the gas valve modulator
and adjust the device at the minimum power.
- Measure the gas pressure after the regulator
using the micromanometer connected to the
relative outlet. Check that the measured value is
the same as that listed in the “min” column of the
- 50 mbar), leaving the second input free if
present (Pict. 23)
- Loosen the screw holding the pressure
outlet after the regulator and connect it with
silicone tubing to the + input of a differential
manometer with an appropriate range (at
least 0 - 50 mbar), leaving the second input
free if present – (Pict. 23)
- Turn on the gas supply by opening the shut-
off valve located on the meter and open the
gas cock before the boiler.
“Burner pressure” table on page 23 for the boiler
and gas type used. If the measured value does
not correspond to the table, adjust the central
adjustment screw on the gas valve until it does,
turning it CLOCKWISE to increase the pressure and
ANTICLOCKWISE to reduce it.
- After the adjustment is finished, connect the cable
again to the gas valve modulator.
Pict. 22
Pict. 23
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