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PICTURE 4: HEAD AND AIR ADJUSTMENT
Head
The air shutter is a mechanical shutter. Do NOT over crank the air shutter. General rule: if the
CO
(Carbon Dioxide) is too low, then close the air shutter. If the CO
2
air shutter. Note: Do NOT set the CO
If the CO (Carbon Monoxide) is above 100 ppm, there is either too much air or too little air.
Check the CO
level and adjust the burner.
2
The retention head is 1/8" inside the tube when the marking reads '22'. There is a full ½"
movement for the retention disk to move backward (to increase secondary air) or forwards (to
decrease secondary air). NOTE: the head physically moves within the blast tube. Do not over
crank the head dial. This movement can also be used to compensate for backpressure in the
combustion area, up to 0.3" W.C.
Caution: If this is the case, the flange and the combustion chamber should be completely
sealed. This pressure firing decreases as the firing rate increases. See Graph 1 . Note: the burner
should be adjusted while it is firing.
Graph 1: Chamber Pressure versus Firing Rate (BTU)
Air
When to adjust the Air
higher than 9.8% for Natural Gas or 11.5% for LP Gas.
2
When to adjust the Head
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
50,000
100,000
To access the head and air adjustment, remove the
plastic cover from the rear of the housing, using
the supplied 4 mm allen key. The left dial is the
head adjustment dial; the right dial is the air
adjustment dial. These dials can spin 360
times for the head and 32 times for the air. Using
the same 4 mm allen key, turn the numbered dials
to the appropriate head setting (please refer to
Chart 5 on page 8). These recommended settings
are only approximate settings. Actual field
conditions will vary and require a certified
technician to adjust the burner. OEM settings
may differ.
150,000
200,000
250,000
BTU's
is too high, then open the
2
300,000
12
o
22
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