14
the flexible hoses for the oil and the electrical
cables are long enough to allow the 90°
opening of the boiler door.
For gas burners the use of flexible pipes for
the gas is not allowed; so the final part of the
gas feeding line to the burner must have the
possibility to be removed, via a threaded or
flanged connection.
2.8 - CONNECTION OF THE
SIGHTGLASS TO THE
BURNER VIA A
COOLING LINE
The flame sightglass is equipped with a 1/8"
threaded connection (pos. 1) on which
a pressure test nipple (9 mm dia.) is fitted.
This can be used with a silicon pipe for the
measurement of the counterpressure in the
combustion chamber.
At the place of this pressure test nipple, which
must be held, a special microbore pipe (pos. 2)
will connect the flame sightglass directly to
the pressure room downstream the fan of the
burner.
The air, blown by the fan, will cool down and
clean the sightglass.
If the sightglass is not cooled down it can be
brocken down.
WARNING: In the proximity of the sightglass
the temperature is very high: be careful!!!
fig. 17
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