Air Damper Setting - Riello PRESS 140 P/N Installation, Use And Maintenance Instructions

7.6

Air damper setting

The setting of the air damper is carried out by acting on the
variable profile cam 1). This operation must be performed after
regulating the pressure variator and the combustion head. With
burner on, disconnect the servomotor from the power supply and
release it manually by pressing the release button placed on the
lower side.
Maximum output adjustment
Set the servomotor to 130°, lock it and change the profile 4) by
gradually acting on the screws 2).
Minimum output adjustment
Unlock the servomotor again, set it manually to 20°, lock it and
adjust the profile 4) by gradually acting on the screws 2).
Intermediate output adjustments
They are carried out in the same manner.
At the end of the operation, check all calibrations, restore the
electrical connections of the servomotor and lock the adjustment
screws 2) by means of the transversal screws 3).
7.6.1 Variation of the air damper tie-rod length
Lengthening the tie-rod is recommended when the air damper
moves within a reduced angle (air damper approx. halfway its
stoke at the maximum output). In this way, a too curved cam
profile 4) can be avoided.
With the burner off, proceed as follows:
 Disengage the articulated coupling 2) from the lever 1).
 Loosen the extension 3) from the tie-rod 4) by some turns.
 Reconnect the articulated coupling to the lever and lift the
profile 4) until setting the index of the air damper to 0 with
servomotor at 0°.
20170392
Start-up, calibration and operation of the burner
1 - Cam
2 - Adjustment screws
3 - Locking screws
4 - Adjustable profile
Articulated coupling (2)
Extension (3)
Tie-rod (4)
30 GB
2
Lever (1)
D1998
3
1
4
Fig. 31
D2004
Fig. 32