FloAire FAV - Manual (Page 21)

21
PROFILE ADJUSTMENTS
The Direct-Fired Gas, make-up heater requires the correct air flow velocity across the burner. The air
flow switch monitors the profile pressure differential, and will open the burner circuit if pressure difference
is not within the allowed range. The air flow switches have low and high pressure settings for variable air
volume units. The pressure drop should not be near the minimum and maximum of the air flow switch.
Profile adjustment may be required to fine tune the burner profile pressure drop. See the specifications
and instructions below on air balancing a 100% fresh air heater.
Single-Speed Profile
The pressure drop should be checked with the burner OFF if ambient temperature is greater than 60
degrees Fahrenheit. If the ambient temperature is lower than 60 degrees Fahrenheit, the burner should
be operating and discharging approximately 70 degrees Fahrenheit. An extra set of airflow probes have
been installed to ease in checking profile differential.
WARNING!!
Disconnect power and close all gas valves before and while making burner profile adjustments.
Single-Speed Profile
If the pressure drop is too low, adjust the profile
opening to be smaller, which will increase the
pressure drop.
If the pressure drop is too high, adjust the profile
opening to be larger, which will decrease the
pressure drop.