Advertisement
Step 3:
Control
Methodology
Air
Excess
Gas
ir/Gas Flow
ll standard Ratio irs are designed for:
air:gas ratio controlled combustion.
10% to 15% excess air at high fire.
higher excess air at low fire
urner Control
atioAirs come with a ratio regulator that maintains the air:gas
ratio.
air
Ratio
Regulator
A control signal is sent from a process temperature
controller (sold separately) to the control motor. ( efer to
Bulletin 818C or contact Eclipse Combustion for further
information on temperature controllers.)
he control motor modulates the air butterfly valve (BV)
which controls the combustion air flow.
Air pressure in the burner body sends an impulse down the
loading line to the ratio regulator.
he ratio regulator controls the gas flow in proportion to the
air flow.
Do not use other control methods, such as, a fixed-air
control, and do not alter the ratio regulator or
burner piping without prior approval from Eclipse
Combustion.
clipse RatioAir v1 - Design Guide No. 115, 2/14/05
Gas Flow
Loading Line
Process
Set Point
Control
Controller
Signal
Process
arning:
Control
Motor
Heat
Air Butterfly Valve (BV)
Control
Air
Motor
BV
Gas Flow
Ratio
Regulator
13
Advertisement
