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"PAB" version gas burners gas train in-
stallation and setting instructions
Fix the gas train to burner body by means
of the screws of the flange, pay attention
to set correctly the gasket.
Connect electrically the gas train with the
6 pole plug. Switch on the burner (it has al-
ready been tested in the factory, so it is pre
set on average values) and verify the ti-
ghtness of gas train connections made du-
ring installation. Act as follows to adapt the
burner output to the boiler.
High flame
1. Bring the burner in high flame , air inlet
must be set at 75 ° (maximum opening po-
sition). To adjust air capacity operate on
the combustion head position. Just in pe-
culiar case it is necessary to reduce the air
flow in high flame closing air intake dam-
per.
2. The position of gas butterfly valve must
be lower then 90° ( typically 85°. It is im-
portant not get over 90° to obtain a per-
fect combustion during passage from high
to low flame). Eventually adjust this posi-
tion acting on the screw "1 ", after loose-
ning nut " 2 ".
3. Regulate gas capacity in high flame
through the gas governor, or operate on
the adjustable gas valve.
Servomotor SQN 30 151A2700
Remove cover to gain access to the adjusting cams. The cams are to be adjusted
through the suitable key provided for. Description:
I
- Limit switch for air damper "High Flame" position adjustment (Max. power).
II
- Limit switch for the air damper position at burner's shut down.
III - Limit switch for air damper "Low Flame" position adjustment (Min. power).
V
- Limit switch for 2nd stage's solenoid valve opening release.
(5): MANUAL RELEASE SWITCH
NOTE : Cam V (to allow the 2nd stage's solenoid valve opening) must be adjusted to an
intermediate position between the Low and High Flame ones (to an angle approximately
5° greater than the low flame position).
!
Risk of air blast!
Continuously check CO, CO 2 and soot emissions when adjusting the output of the burner. Optimise combustion values in the
event of CO formation. CO must not exceed 50 ppm.
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1
Low flame
4. Choose the first stage position on the
servocontrol ( normally between 10° - 30°)
on the basis of the reduced charge output
required and switch the burner to low
flame.
5. Regulate gas capacity, to obtain optimal
combustion, changing the position of the
gas valve disc, act on screw " 3 ", after loo-
sen nut " 4 ".
Final operations
6. Bring the burner in high flame again, if
necessary adjust again gas flow (as shown
in point n.2).
7. If necessary repeat operations descri-
bed on point n. 5 and n. 6 until You obtain
the exact position of the gas flow both in
high and low flame.
8. Fix the nuts.
Firing head setting
The firing head is pre-adjusted at the 50%
from the factory. The setting fully open
enables to reach the full power of the
burner and full close to reach the minimum
power of the burner. The optimal position
depends on the output that we need to
reach but the default setting shall be
modified only when you are not able to
reach the suggested combustion value by
adjusting the air flow in the maximum
flame.
+
2
SAgG
2
1
0
Adjustment of gas solenoid valve
Refer to the gas train manual for the gas
setting of the gas train selected.
N.B. observe the minimum required
flue gas temperature specified by the
boiler manufacturer and the requirements
demanded of flue gas ducts for avoiding
condensation.
5
420010576400
-
0=STOP
3
1=OIL
2=GAS
3=AUTO
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