26
5/32” GAP
ELECTRODE
NOZZLE
0-1/16”
5/16” ABOVE CL
COMBUSTION AIR
In order for the fl ame to burn effi ciently, it must
receive adequate combustion air. The amount
of combustion air required will vary depending
on altitude, actual B.T.U. content of the fuel be-
ing used, gas pressure, conversion to another
gas and other factors. The burner fl ame should
be observed and any necessary adjustments
made before the furnace is placed into service.
See Table 9 for Factory Air settings.
Gas Gun
Combustion air box adjustment is made to the
main burner by loosening the two lock nuts on
the plastic air shutter, located on the left side of
the burner blower housing. Air shutter adjustment
line is located on the same side of the blower
housing. Turn the plastic shutter to a smaller
number (counter clockwise) for less air to a larger
number (clockwise) for more air. Gently tighten
the lock nuts after completing the adjustment.
For best results, use instrument to measure
between 8-9% CO
2
, after the combustion air
has been adjusted. Note: Do not over-tighten
the lock nuts, otherwise the plastic air shutter
may be damaged.
Oil Gun Only
It is recommended that the CO
2
and Smoke
levels should be measured for maximum per-
formance. CO
2
readings should be 10-11% for
66,000 BTUH furnaces and 12-13% for 86,000
BTUH furnaces. The Smoke should be N0. 0 on
the Bacharach Scale, and 0 to 0.02 negative
draft over fi re.
Electrode Setting (Oil Gun Only)
Poor ignition of the oil spray may result if the
electrodes are not adjusted as shown in Figure
32. Do not permit any electrodes to be grounded
to any surface.
Switching the Honeywell R7184 Ignition
Control between Interrupted and Intermittent
Duty (Oil Gun Only)
The Honeywell oil primary control can be
switched between interrupted and intermittent
ignition control. To switch from interrupted duty
(Factory set) to intermittent duty, remove the
igniter wire from the blue control wire. Attach
the burner motor and igniter wire to the orange
control wire. Cap and reseal the orange control
wire. Cap and isolate the blue control wire.
CAUTION:
• Combustion air adjustment must be
made only by a qualifi ed technician.
Improper air adjustment may cause
unsafe operation, explosion and/or
fi re asphyxiation.
• If the input to the furnace is too great
because of excessive gas pressure,
wrong size nozzle or orifi ce, high
altitude, etc., the burner fl ame will
be sooty and can produce carbon
monoxide, which could result in
unsafe operation, explosion and/or
fi re or asphyxiation.
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1 3/8”
Figure 32. Oil Gun electrode Position
Figure 33. Convertible Pressure
Regulator Cap
PRESSURE
REGULATOR
CAP
M11678
N
A
T N
A
T
L
P
L
P
N
A
T N
A
T
OR
OTHER SIDE
OF CAP
Honeywell
Valve
