Lpg - Propane - Butane Operation - Riello RLS 70 Installation, Use And Maintenance Instructions

AIR PRESSURE SWITCH
(A)
MIN. GAS PRESSURE SWITCH
(B)
(C)
4 - AIR PRESSURE SWITCH (A) - CO CHECK
Adjust the air pressure switch after having per-
formed all other burner adjustments with the air
pressure switch set to the start of the scale (A).
With the burner operating in 1st stage, increase
adjustment pressure by slowly turning the rela-
tive knob clockwise until the burner locks out.
Then turn the knob anti-clockwise by about 20%
of the set point and repeat burner starting to
ensure it is correct.
If the burner locks out again, turn the knob anti-
clockwise a little bit more.
Attention: as a rule, the air pressure switch
must limit the CO in the fumes to less than 1%
(10.000 ppm).
To check this, insert a combustion analyser into
the chimney, slowly close the fan suction inlet
(for example with cardboard) and check that the
burner locks out, before the CO in the fumes
D521
exceeds 1%.
The air pressure switch may operate in "differ-
ential" operation in two pipe system. If a nega-
tive pressure in the combustion chamber during
pre-purging prevents the air pressure switch
from switching, switching may be obtained by fit-
ting a second pipe between the air pressure
switch and the suction inlet of the fan. In such a
manner the air pressure switch operates as dif-
ferenzial pressure switch.
Warning: the use of the air pressure switch with
differential operation is allowed only in industrial
applications and where rules enable the air
pressure switch to control only fan operation
without any reference to CO limit.
5 - MINIMUM GAS PRESSURE SWITCH (B)
Adjust the minimum gas pressure switch after
having performed all the other burner adjust-
ments with the pressure switch set at the start of
D896
the scale (B).
With the burner operating in 2nd stage, increase
adjustment pressure by slowly turning the rela-
tive knob clockwise until the burner locks out.
Then turn the knob anti-clockwise by 2 mbar
and repeat burner starting to ensure it is uni-
form.
If the burner locks out again, turn the knob anti-
clockwise again by 1 mbar.

LPG - PROPANE - BUTANE OPERATION

The burners can also operate on LPG-Propane-
Butane gases.
In this case it is necessary to assemble the noz-
zles 2)(C) on the holes 1)(C) and the caps 3)(C)
on the small pipes 4)(C) supplied with the
burner.
Apply the self-adhesive label for LPG operation
near the characteristic label.
The firing rate range and burner adjustment are
D1181
similar to those for natural gas.
The G31 (Propane) gas pressure is shown on
page 26.
Gas train: use the gas train for natural gas, see
page 28, with 1"1/2 or 2" diameter.
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