18
Initial Air Settings
If your burner was built for a speci
fi
c OEM application,
the “Mfr’s Settings” label (see
Figure 1
) will indicate
the application and the initial air settings made at
Beckett. Please verify those settings using the following
procedure.
If your burner was not built for a speci
fi
ed application,
the following steps outline the procedure for initially
setting the damper (these settings may be different from
settings speci
fi
c to a particular OEM).
Refer to
Figure 17A/B
and
Table 4
for this procedure.
Remove the cover screw (
A
) then the cover (
B
) and
set aside.
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 6
.
Using the same wrench, adjust the red high
fi
re
cam (
H
) to the initial settings listed in
Table 6
.
To adjust the high
fi
re transition, use a small straight
edge screwdriver. 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.
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.
1.
2.
3.
4.
5.
6.
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
Figure 17A - Damper Motor with Cover
Figure 17B - Damper Motor
Legend (
Figures 17A & 17B
)
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)
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 17B
) and rotate the damper plate to its full closed
position. The position indicator should point to 0° within
+ 5° tolerance.
Section: Prepare the Burner for Start-up