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 fire cam (D) to the initial setting listed in Tables 4a or 4b.
3.Using the same wrench, adjust the red high fire 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 fire 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.
6.To adjust the high fire 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.
y 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 fire rate.
y This initial setting should be adequate for starting the burner at low fire. Once the burner is in operation, the air setting will be adjusted for best performance as discussed later in this manual.
y Follow the procedures described later in this manual to fine tune the air settings.
NOTICE
The damper plate is attached by screws to its shaft, and bears against a flat 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 flat matching the one on the damper shaft. The flats 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 flats is to tighten the setscrews that bear against the flats on the shafts first, 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.
Figure 13A. Damper Motor with Cover
Figure 13B. Damper Motor
Legend (figure 13A & 13B)
ACover screw
BCover
CWrench
DLow fire cam (blue)
ECam notch
FDamper motor scale
GDisengaging pin
HHigh fire cam (red)
18 | Form 6104 |
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