Maximum Output; Minimum Output; Intermediate Outputs; Gas Combustion Checks - Riello RLS 70 Installation Instruction

4.17.3 Maximum output

Using button B) (Fig. 34), "increase output" until it stops, app. 130°
(cam 1).
Place the slide switch on MAX and set the relative MAX trim poten-
tiometer (setting must be very near to 130°) to exploit as far as pos-
sible the variable profile cam 4) (Fig. 30, page 20) and have the
gas butterfly valve on maximum opening, graduated sector 2) on
index 3) (Fig. 30).
The setting of the gas flow must be made at the gas regulator and,
if necessary, on the gas valve.
The air setting must be made on the variable profile cam 4)
(Fig. 30, page 20) by turning the screws 5), after loosening the
screws 6).
The gas output must be higher than the oil output; if
not the stroke of the servomotor cannot be in-
creased above 130°.
WARNING

4.17.4 Minimum output

With the slide switch on the OPE position, use button B) (Fig. 34)
"decrease output" until it stops at app. 20° (cam 3).
Put the slide switch in the MIN position and set the modulation min-
imum (gas only) using the relative MIN trim potentiometer.
Set the air using the variable profile cam 4) (Fig. 30, page 20).
If a lower modulation minimum is required than the level set on cam
3 of the servomotor (20°), decrease the cam setting.

4.17.5 Intermediate outputs

With the switch C) (Fig. 34) in the AUTO position, the slide switch
in the OPE position and the switch 1) (Fig. 35, page 21) in the MAN
position, move the button 2) (Fig. 35, page 21) in various interme-
diate levels between maximum and minimum and set the variable
profile cam 4) (Fig. 30, page 20) to achieve optimum combustion,
by turning the screws 5).
If possible, do not change the previously set maximum and mini-
mum levels.
Check the various setting levels with a combustion analysis.
Make a progressive setting of the profile, without
sharp changes.
WARNING
When the setting is complete, lock the cam profile using screws 6)
(Fig. 30, page 20).
Turn the burner off, release the servomotor as shown in (Fig. 32,
page 20) and manually turn cam 4) (Fig. 30, page 20) to check the
cam is not binding during rotation.
Definitive fuel-oil adjustment
Setting is made only by adjusting the servomotor cam:
cam 4 for high fire oil and cam 5 for low fire oil.
NOTE:
Do not change the profile of cam 4) (Fig. 30, page 20), which
has already been set for gas.
Turn the selection switch 11) (Fig. 3, page 8) to OIL.
6046
Installation
Turn the burner on with switch C) (Fig. 34) on AUTO and the slide
switch on OPE.
After firing, turn the switch 1) (Fig. 35, page 21) to MAN position,
use button 2) (Fig. 35, page 21) to "decrease output" until cam 5
stops, which had previously been set and then make the definitive
setting for low fire oil, opening or closing the cam to obtain optimum
combustion.
Use button 2) (Fig. 35, page 21) "increase output" until cam 4
stops, which had previously been set, and make the definitive set-
ting for high fire oil, opening or closing the cam for optimum com-
bustion.
NOTE:
Cam 4 must not be set above 130° (it must not exceed cam 1,
gas maximum).
Cam 6, which commands the high fire oil valve, must always
be ahead of cam 4.

4.17.6 Gas combustion checks

CO2
It is better to set the burner with CO2 not higer than 10% (with nat-
ural gas). In this way avoiding a loss of calibration setting (for ex-
ample draft variation) that could cause combustion with little air and
the production of CO.
CO
It must be not higher than 400 PPM.
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