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tep 2:
Control
Methodology
he simplest control method is fuel modulation at fixed air flow. If
required turndown is greater than the burner’s capabilities, there
are two options:
ir Modulation
.
o lower the minimum input of the burner, the air flow can be
decreased as long as the pressure drop across the burner does not
go outside of the operating limits given in the “Operating Ranges”
chart in Data Sheet No. 160. he air flow can be changed with a
two-speed air handling system or a modulated system. As an
example, the air flow could be turned down from a pressure drop
of 1"w.c. to 0.25"w.c., giving a total air turndown of 2:1. his could
extend the minimum input level from 20,000 to 13,000 Btu/hr/ft.
igure 3.8
taged Burners
Stage 2
Main
Pipe
Gas
Union
Stage 1
Pipe
Main
Union
Gas
clipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
Pipe
Union
Pipe
Union
Staging
Divider Plate
Part No. 76506
Pipe
Union
Stage 1
Pilot Gas
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