3.1
PRE-LIGHTING CHECKS
When the boiler is started for the first time, the following
controls shall be carried out:
−
Check that the boiler has been filled with water and
correctly vented.
−
Make sure that the gate valves are open.
−
Check that flue for the discharge of the products of
combustion is not obstructed.
−
Open the gas cock and check the connections, inclu-
ding the burner one.
−
Release the air contained in the gas pipe by using the
special pressure test nipple on the gas valve inlet.
−
Make sure that the electrical connection has been
made correctly and that the earth wire is connected to
a good earth system.
−
Check that the circulator is not locked, otherwise
unlock it.
−
Check that there are no inflammable liquids or mate-
rials near the boiler.
3.2
HONEYWELL V 4600 C GAS VALVE
Standard
“RX 19÷55 CE”
and
“RX 19-26 PVA CE”
boi-
lers feature a HONEYWELL V 4600 C gas valve (fig. 11).
Follow these instructions to ignite the boiler and to adjust
the valve:
−
Release the air contained in the gas pipe by using the
inlet pressure tap (6) on the gas valve.
−
Press the gas valve push button hard and, simulta-
neously, push the piezo igniter button several times.
−
Keep the valve button pressed for 15-20 seconds, then
release it checking through the peep-hole that the pilot
burner is on.
Should it go off, repeat the operation.
−
The pilot burner gas flow rate shall be adjusted on the
screw (4). To decrease the pilot flame rotate the screw
clockwise; to increase the pilot flame rotate the screw
anticlockwise.
−
Start the main burner pressing the main switch on the
control board.
−
To adjust the main burner gas pressure remove the
plug on the pressure regulator (2). The regulation is
made by rotating the screw under the plastic plug with
a screwdriver: rotate the nylon screw anticlockwise to
reduce the pressure, clockwise to increase it.
−
To shut the boiler completely off, including the pilot bur-
ner, simply rotate the gas valve button clockwise.
3.3
SIT 830 TANDEM GAS VALVE
Standard
“RX 19-26 CE IONO”
and
“RX 19-26 PVA CE
IONO”
boilers with electronic ignition feature a SIT 830
TANDEM gas valve (fig. 12).
When the boiler is ignited for the first time, it is always
better to purge the pipe through the pressure tap (3).
Remove the plug on the pressure regulator (4) to adjust
the main burner gas pressure.
The regulation is made by rotating the screw under the
plug: rotate the screw clockwise to increase the pressu-
re, anticlockwise to reduce it. The valve can control a
“soft” ignition of the boiler through the screw (1). Rotate
the screw anticlockwise to increase the burner “soft” igni-
tion pressure (STEP), clockwise to reduce it. The opti-
mum “soft” ignition values of the burner depend on the
type of gas:
−
natural gas: 3-4 mbar
−
L.P.G.: 6-7 mbar.
9
3 Use and maintenance
KEY
1
Control button
2
Pressure regulator
3
Electric operator
4
Pilot burner adjusting screw
5
Outlet pressure tap
6
Inlet pressure tap
Fig. 11
ON
OFF
