750-96 (revised 2010)
Model CB Packaged Boiler Manual
5-3
5.2 — Linkage: Modulating Motor and Air Damper
Position the oil and/or gas modulating cams on the jackshaft so that the cam follower assembly is at its lowest
point.
FIGURE 5-2. Modulating Cam
In this position, fuel delivery is at low fire rate. Secure cams with the setscrews.
The stop screw in the rotary air damper limits damper travel
at both closed (low fire) and fully opened (high fire) positions.
This screw is provided so that it is possible to tell, even with
the burner in place, whether the damper rotor is in fully
opened or closed position by rotating the damper open and
closed by means of the damper arm. Normally, the rate of
flow of air through the damper with the rotor in low fire posi-
tion is about one-third of maximum.
FIGURE 5-3. Rotary Air Damper
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