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Form 6104 BCF23-R05
Initial air settings
The following steps outline the procedure for initially
setting the damper. Refer to Figures 13A and 13B and
Tables 4a or 4b for this procedure.
1. Remove the cover screw (A) then the cover (B) and
place to one side.
2. Using the wrench (C) supplied with the damper
motor, adjust the blue low fi re cam (D) to the initial
setting listed in Tables 4a or 4b.
3. Using the same wrench, adjust the red high fi re cam
(H) to the initial settings listed in Tables 4a or 4b.
4. Ensure the damper plate is in the correct position.
The cam notch (E) should align with the low fi re
setting on the damper motor scale (F).
5. If the damper plate is not in the correct position,
disengage the motor by pushing in on the motor pin
(G), then rotating the damper plate until the cam
notch and motor scale setting are aligned. Re-engage
the pin.
6. To adjust the high fi re transition, use a small straight
edge screw driver, turn the white adjustment screw,
located in the orange transition cam, either clockwise
or counterclockwise until the cam indicator is half
way between the high and low settings on the scale.
Rotate the air adjusting plate until the lower edge
of the pointer is opposite the number from Tables
4a or 4b corresponding to the desired low fi re
rate.
This initial setting should be adequate for starting
the burner at low fi re. Once the burner is in
operation, the air setting will be adjusted for best
performance as discussed later in this manual.
Follow the procedures described later in this
manual to fi ne tune the air settings.
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The damper plate is attached by screws to its shaft, and bears
against a fl at on the shaft for alignment. The shaft is secured
to the damper motor by a sleeve coupling with two setscrews
bearing against the damper shaft and two more against the
motor shaft. The motor shaft has a fl at matching the one on
the damper shaft. The fl ats on the damper shaft and the motor
shaft should be aligned so that the position indicator in the
damper motor reads accurately. The best way to align the
fl ats is to tighten the setscrews that bear against the fl ats on
the shafts fi rst, and then tighten the ones that bear against the
round surface of the shafts afterward.
The test for proper alignment is to disengage the damper motor
from its shaft using the disengaging pin (Item G in Figure
13B) and rotate the damper plate to its full closed position. The
position indicator should point to 0° within + 5° tolerance.
NOTICE
Figure 13A. Damper Motor with Cover
Figure 13B. Damper Motor
Legend (fi gure 13A & 13B)
A
Cover screw
B
Cover
C
Wrench
D
Low fi re cam (blue)
E
Cam notch
F
Damper motor scale
G
Disengaging pin
H
High fi re cam (red)