DF Series installation manual
20
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9.
OPERATING SEQUENCE FOR SINGLE VOLUME DIRECT FIRED HEATER
(For guidance only)
Starting up the burner
a.
Create a heating demand.
b.
If outside temperature is under 70°F, the outside temperature sensor (TDA)
allows for the FIREYE flame safeguard to be energized.
c.
Authorization for pilot to ignite is complete when the low and high air pressure
differential and high temperature limit switches are closed.
d.
The burner starts.
e.
The MAXITROL controller modulates the burner to maintain the selected set
point of the temperature selector.
10.
OPERATING SEQUENCE FOR DOUBLE VOLUME DIRECT FIRED HEATER
(For guidance only)
Starting up the burner
a.
Create a heating demand.
b.
If outside temperature is under 70°F, the outside temperature sensor (TDA)
allows for the FIREYE flame safeguard to be energized.
c.
The burner starts.
d.
In low volume mode, when airflow is reduced either by the inlet damper or by
a VFD, the profile plate damper opens partially and modulates to maintain the
required air pressure drop across the burner.
e.
In high volume mode, when airflow is increased either by the inlet damper or
by a VFD, the profile plate damper opens wider and modulates its position to
maintain the required air pressure drop across the burner.
