Combustion Test Target Ranges
Figure 1 Gas valve and fan
The Low Fire (Zero-offset) valve adjustment
cap on the gas valve has been factory set.
Do not tamper with or adjust this screw in the
field. Contact the factory for written
instructions if considering field adjustment of
the Low Fire (zero offset) adjustment.
The High Fire (Gas:Air) ratio adjustment
screw is a slotted brass screw to the left of
the long brass protrusion on the front of the
gas valve. It will have to be adjusted to attain
optimum combustion results whenever fuel
conversion is undertaken; however, no
mixture adjustment must be performed
unless done by a qualified technician using
properly functioning and calibrated
combustion analyzing equipment.
Fuel
High Fire
Low Fire
Co Max PPM
Range
Target
Range
Target
Natural Gas
9.0 – 10.0
9.5
8.2 – 9.2
8.7
< 150
Propane
10.3 – 11.3
10.8
9.3 – 10.3
9.8
< 250
Table 1
Combustion test target ranges - CO
2
/ Maximum CO
Note
: Low Fire CO2 should be at least 0.5% lower than High Fire CO2.
2
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