Beckett CG50 - Manual (Page 19)

19 CG15, CG25, CG50 Burner Manual
Figure 10A - Damper Motor with Cover
Figure 10B - Damper Motor with Cover Removed
Push in on pin (G) to disengage the motor from the
damper shaft and cam stack. Rotate the damper
shaft by hand to place the adjustment cams in a
position where their adjustment scale can be easily
seen. Release pin (G) to secure the damper shaft
and cam stack to the motor.
Using the wrench (C) supplied with the damper
motor, adjust the blue low fi re cam (D) to the initial
setting listed in Table 3.
Using the same wrench, adjust the red high fi re cam
(H) to the initial settings listed in Table 3.
To adjust the high fi re transition, use a small straight
edge screwdriver. For high/low fi ring burners, turn
the white adjustment screw located in the orange
transition cam (J) until the cam indicator is half way
between the high and low settings on the scale. For
modulating burners the orange transition cam is not
used.
After setting all the cams, make sure the damper
shaft and cam stack is set between its low fi re setting
and its high fi re setting. (If you don’t it may not move
when it is powered.) Push in pin (G), move the
damper by hand so that notch (E) is between the low
fi re setting and high fi re setting on scale (F), then
release pin (G) to re-engage the motor. When the
motor is powered it will go to its low fi re setting.
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. Don’t forget to
re-install the cover after all adjustments have been
made. 2.
3.
4.
5.
6.
7.
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 10B) and rotate the damper plate to its full closed
position. The position indicator should point to 0° within
+/- 5° tolerance. 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)
J - Transition cam (orange)
Legend (Figures 10A & 10B)
A
B
H D J
E F G C
Section: Start the Burner