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D - AIR DAMPER ADJUSTMENT
Fig. 5
The air damper adjustment is made by acting on the cam with variable profile (1).
This adjustment has to be carried out after the settings of the pressure controller and of the combustion head.
With the burner in operation, switch off the elec. supply of the servomotor and re-set it by acting on the lever (6)
(fig. 2).
Setting of the maximum output
Place the servomotor on 130°, lock it and vary the profile (4) by gradually acting on the screws (2).
Setting of the minimum output
Reset the servomotor again, place it manually on 20°, lock and adjust the profile (4) by gradually acting on the
screws (2).
Settings of intermediate outputs
Follow the same procedure.
At the end of the setting, re-check all the regulations, re-connect the electrical wires to the servomotor and fasten
the adjusting screws (2) by the locking screws (3).
Lever (1)
Articulation (2)
Extension (3)
Tension rod (4)
5481
Length variation of the air damper tension rod
It is useful to extend the tension rod when the air damper moves into a
reduced angle (air damper at half stroke for the maximum output), in this
way the cam profile is not too much bent (4).
With the burner stop, act in this way:
-Disjoint the articulation (2) from the lever (1) (see drawing).
-Unscrew the extension (3) from the tension rod (4) (some rounds).
-Re-connect the articulation to the lever and move the profile (4) (fig. 5) up
to reach the air damper set-point 0 with servomotor at 0°.
D2004
2
3
1 - Cam
2 - Adjusting screws
3 - Locking screws
4 - Variable profile
13
GB
4
1
D1998
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