DF Series installation manual
14
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BURNER AIR DIFFERENTIAL PRESSURE ADJUSTMENT
NOTE:
Always read the air differential pressure when air inlet filters are new and
clean.
a.
For direct gas-fired burners, the airflow rate through the burner is very
important. If the air differential pressure at the burner profile plate is too high
or too low, the unit will not function properly. This could produce an excess of
carbon monoxide (CO) or trigger a FLAME FAILURE alarm.
b.
To measure the differential pressure at the burner profile plate, the blower
must be in operation and discharge air temperature maintained at 70°F (21°C).
In winter, to maintain this temperature, the burner must be in operation and
the temperature selector set at 70°F (21°C).
c.
Using an air pressure gauge read the differential pressure as shown in figure 1.
Figure 1