Eclipse AH-MA Series Guide

No. 160, 8/1/05
Design Guide
AirHeat
Burners
Version 2
AH-MA Series

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
2
Copyright 2004 by Eclipse, In c. All rights reserved worldwide.
This publication is protected by federal regulation and shall
not be copied, distributed, transmitted, transcribed or
translated into any human or computer language, in any form
or by any means, to any third parties, without the e press
written consent of Eclipse, Inc., Rockford, Illinois, U.S.A.
We reserve the right to change the construction and/or
configuration of our products at any time without being
obliged to adjust earlier supplies accordingl y.
The material in this manual is believed adequate for the
intended use of the product. If the product, or its individual
modules or procedures, are used for purposes other than
those specified herein, confirmation of their validity and
suitability must be obtained. Eclipse, Inc. warrants that the
material itself does not infringe any United States patents. No
further warranty is e pressed or implied.
We have made every effort to make this man ual as accurate
and complete as possible. Should you find errors or omissions,
please bring them to our attention so that we may correct
them. In this way we hope to improve our product
documentation for the benefit of our customers. Please send
your corrections and comments to our Documentation
Manager.
It must be understood that Eclipses liability for its products,
whether due to breach of warranty, negligence, strict liability,
or otherwise, is limited to the furnishing of such replacement
parts and Eclipse will not be liable for any other injury, loss,
damage or e penses, whether direct or consequential,
including but not limited to loss of use, income of or damage
to material arising in connection with the sale, installation, use
of, inability to use or the repair or replacement of Eclipses
products.
Any operation e pressly prohibited in this Guide, any
adjustment, or assembly procedures not recommended or
authorized in these instructions shall void the warranty.
C OPYRIGHT
D ISCLAIMER NOTICE
L IABILITY AND
WARRANTY

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
3
This manual has been written for those persons who are already
familiar with all the aspects of an air heat burner and its add-on
components, also referr ed to as the burner system. These aspects
are:
 design/selection
 installation
 use
 maintenance
The audience is expected to have pr evious experience with this
ind of equipment.
Design Guide No. 160
 This publication.
Data Sheet No. 160
 Required to complete design calculations in this guide.
Installation Guide No. 160
 Used with Data Sheet to complete installation.
Price Sheet No. 160
 Used to order burners.
 EFE-825 (Combustion Engineering Guide)
 Eclipse Bulletins & Instruction Manuals: 818, 820, 826, 832, 852, 854, 856
A UDIENCE
A H - MA PUBLICATIONS
About this manual
R ELATED PUBLICATIONS

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
4
 Read this manual carefull y. Mak e sure that you understand the
structure and contents of this manual.
 Ob ey all the safety instructions.
 Do not deviate from any instructions or application limits in this
man ual without written consent from Eclipse Combustion.
 If you do not understand any part of the information in this
man ual, do not continue. Contact your Eclipse sales office or
Eclipse Combustion.
here a re several special symbols in this document. You must know
their meaning and importance.
he explanation of these symbols follows. Please read it thoroughly.
Danger:
Indicates hazards or unsafe practices which WILL
result in seve re personal injury or even death.
Only qualified and well trained personnel ar e
allowed to carry out these instructions or
procedures.
Act with gr eat care and follow the instructions.
Warning:
Indicates hazards or unsafe practices which could
result in se vere personal injury or damag e.
Act with gr eat care and follow the instructions.
Caution:
Indicates hazards or unsafe practices which could
result in damage to the machine or minor personal
injury.
Act carefully.
Note:
Indicates an important part of the text.
Read the text thoroughly.
D OCUMENT
CONVENTIONS
I MPORTANT NOTICES

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
5
About this manual ....................................................................... 3
Table of Contents ........................................................................ 5
Introduction .................................................................................... 6
Product Description ....................................................................... 6
Safety ................................................................................................... 7
Introduction....................................................................................... 7
Safety .................................................................................................... 7
Capabilities.......................................................................................... 8
Operator Training ............................................................................. 8
Replace ent Parts ........................................................................... 8
System Design ............................................................................... 9
Design .................................................................................................. 9
Burner Design ................................................................................... 10
Step 1a: Calculating Maxi u Input Required................... 10
Step 1b: Choosing Design Heat Input at High Fire ............ 10
Step 1c: Deter ining the Length of Burner Needed ........ 10
Step 1d: Calculating Mini u Input Required ................... 10
Step 1e: Layout of the Burner Sections................................. 11
Figure 3.1.1 Burner Sections .................................................... 12
Figure 3.1.2 End Plate Exa ples.............................................. 14
Step 1f: Sizing & Layout of Gas Manifold ............................... 15
Step 1g: Sizing Profile Plates ...................................................... 16
Syste Design ................................................................................... 19
Step 2: Control Methodology................................................... 20
Step 3: Ignition Syste ............................................................... 21
Step 4: Fla e Monitoring Syste ............................................ 22
Step 5: Gas V alv e Train................................................................. 23
Appendix .......................................................................................... 25
Conversion Factors ......................................................................... 25
Table of Contents
1
2
3

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
6
P RODUCT
DESCRIPTION
Eclipse AH-MA v2.10 Air Heat burners produce a uniform, odorless,
and smokeless flame ideal f or heating fresh air in mak e-up and process
air heating applications. The AH-MA design provides stable operation
o ver a ide range of velocities, inputs, and fuels.
AH-MA v2.10 burners are line type burners constructed of cast
iron or aluminum burner bodies and diverging stainless steel air
ings. The burner bodies supply fuel to the center of the air ings to
control the air and fuel mixture inside the burner and to optimize
emissions and efficiency. Completely corrosion resistant design
options are available using aluminum burner bodies or electroless
nickel plated cast iron burner bodies.
The AH-MA v2.10 Air Heat burner is assembled from straight
sections, tees, and crosses to produce nearly any configuration
required. Large burners can be built as a combination of staged,
individually controlled sections to increase turndo n.
Figure 1.1 AH-MA v2.10 Air Heat Burner
Introduction
Adjustable
Profile Plate
Adjustable
Profile Plate
Heated Air
Air Wing
Uniform
Air Flow
Uniform
Air Flow
Gas Feed Pipe
Burner Body
Flame
Length
1

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
7
I NTRODUCTION
S AFETY
Safety
In this section, you will find important notices about safe
operation of a burner system.
Danger:
The burners covered in this manual are designed
to mix fuel with air and burn the resulting
mixture. All fuel burn-ing devices are capable of
pr oducing fires and explosions when improperl y
applied, installed adjusted, controlled, or
maintained.
Do not bypass any safety feature.
You can cause fires and e xplosions.
ever try to light the burner if the burner shows
signs of damage or malfunctioning.
Warning:
The burner and duct sections are l i ke ly to have
HOT surfaces. Always w ear protective clothing
when approaching the burner.
Note:
This manual gives inf ormation f or the use of these burners
for their specific limited design purpose. Do not deviate from
any instructions limits in this manual without written advice
f r om Eclipse Combustion.
Note:
Read this entire manual before you attempt to start the
system. If you do not understand any part of the information
in this manual, then contact your Eclipse representative or
Eclipse Combustion before you continue.
2

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
8
Adjustment, maintenance and troubleshooting of the
mechanical and the electrical parts of this system should be
done by qualified personnel with good mechanical aptitude
and experience with combustion equipment.
The best safety precaution is an alert and competent operator.
Thor oughly instruct new operators so they demonstrate an
adequate understanding of the equipment and its operation. Regular
r etraining must be scheduled to maintain a high degree of
proficiency.
Order replacement parts fr om Eclipse only. Any customer
supplied al es or switches should carry UL, FM, CSA, CGA and/or
CE appro al where applicable.
O PERATOR TRAINING
R EPLACEMENT PARTS
C APABILITIES

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
9
Design structure
Designing a burner system is a straight-forward exercise of
combining modules that add up to a reliable and safe system.
The design process is divided into the following steps:
1. Burner design
a. calculating the maximum input requirements
b. choosing design heat input at high fire
c. determining the length of burner needed
d. calculating the minimum input requirements
e. layout of the burner sections
f. sizing and layout of the gas manifold
g. sizing the profile plates
h. burner staging
2. Control methodology
3. gnition system
4. Flame monitoring system
5. Gas valve train selection
Note:
Information in Data Sheet No. 160 is necessary to complete
some of the procedures.
D ESIGN
System Design
3

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
10
Calculating the maximum input requirements
To calculate the total burner maximum input required, solve:
Max. Input (Btu/hr) = 1.3 x SCFM x
∆ T (max)
Caution:
This is an appro ximation based on the gr oss heating value of the
fuel. F or more accurate heat balance calculations, refer to the
Eclipse Combustion Engineering Guide (EFE-8 5).
Choosing design heat input at high fire
See Data Sheet No . 160 for the following:
1 ) Use the Operating Range chart to determine the ma imum and
minimum heat inputs per foot of burner based on the known air
pressur e drop.
2) Use the Flame Length chart to check flame length versus a vailable
distance downstr eam of the burner for uniform temperature
distribution.
Determining the length of burner needed
Burner length, feet = max. heat input, total burner (Btu/hr)
heat input per foot (Btu/hr/ft)
Note:
Round fractional lengths (in ft.) up to the next half-foot.
Calculating minimum input required
1) Minimum Input (Btu/hr) = 1.3 x SCFM x T (min)
2) Min. Heat Input per foot, Btu/hr/ft = min. heat input, total burner, Btu/hr.
burner length, feet
3) With the minimum heat input per foot, go to the Operating
Range chart in Data Sheet No. 160 and confirm that the burner
can operate at the input for the air pre ure drop the burner will
ee. If the minimum input required i too low, there are two
option to obtain thi operating condition:
a. U e a taged burner control ( ee burner taging and control
method in thi ection).
b . Modulate the air flo w to a lower pre ure drop, thu low ering
the minimum input capability of the burner.
Example : A make-up air heat burner will be used to heat
60,000 SCFM air from 0°F to 80°F maximum and, from 75°F to
80°F minimum. Air
∆ P across the burner is designed to be
0.7"w.c. at high fire. The fuel is natural gas.
1) Max. Input Required: Btu/hr = 1.3 X 60,000 X 80 = 6,240,000
Btu/hr.
Step 1: Burner design
D

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
11
2) From the Operating Range chart in Data Sheet No. 160, the maximum
heat input at 0.7" .c. air pressure drop is 800,000 Btu/hr/ft. The flame
length from the Flame Length chart in Data Sheet No . 160 is 30".
Burner length, feet = 6,240,000 Btu/hr = 7.8 feet; round up to 8 feet.
800,000 Btu/hr/ft
3) Minimum: Btu/hr = 1.3 X 60,000 X 5 = 390,000 Btu/hr.
4) Minimum per foot = 390,000 Btu/hr = 48,750 Btu/hr/ft.
8 ft.
5) From the Operating Range chart in Data Sheet No. 160, the
minimum input at 0.7 .c. is 20,000 Btu/hr/ft. Therefore, the
burner can operate over the desired input range.
Layout of the burner sections
Once the lineal feet of burner has been determined, use Figure 3.2
and the criteria belo to define the burner geometry.
For optimum burner performance and a uniform temperature profile,
ev en gas and air flo throughout the burner is essential. The follo ing
guidelines should be used to lay out a burner:
1) Every leg of a Tee or Cross section must be separated from another
Tee or Cross section by at least 150mm (6") of burner.
2) Include the proper number of gas feed inlet sections. Use Table 3.1
as a guide to the number and size of gas feed inlets required based
on the length of the burner.
Table 3.1 Gas Feed Inlet Capacities
Example: A six-foot burner for standard gas pressure will use 2"
N.P.T. r ear inlets to supply gas. How man y gas inlets are requir ed?
Solution: Ea h 2" ba k inlet an supply 4 feet of burner.
Therefore, = 1.5, or 2 inlets are required
3) Spa e gas inlets equally to assure uniform gas distribution.
6/4
1-1/2"
1-1/2"
2"
2"
2"
1"
1-1/2"
1-1/2"
2"
2"
2"
Rear
Side
Rear
Rear
Side
Side
Rear
Side
Rear
Rear
Side
300mm straight section, Cast Iron
300mm straight section
300mm straight section, Aluminum
300mm x 300mm cross section
300mm straight section
300mm straight section
300mm straight section, Cast Iron
300mm straight section
300mm straight section, Aluminum
300mm x 300mm cross section
300mm straight section
standard
standard
standard
standard
standard
Low
Low
Low
Low
Low
Low
4
3
4
6
4
.5
2
1.5
2
6
2
Gas Inlet
Pipe Size Directon Section Type
Gas
Pressure
Max. Burner
Length Per
Inlet*
* Number of feet or 300mm sections
1" Side 300mm straight section standard 1

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 2
Figure 3.1
Cast Iron Burner Sections
150mm Straight Section 300mm Straight Section 300mm Straight Section
with Back Inlet
11.8"
1.6"
10.6"
11.8" 5.9"
1.6"
2.2"
10.6"
9.6"
9.6"
9.6"
150mm x 300mm Tee Section
300mm x 300mm Cross
5.9"
1.5" I.D.
11.8"
5.9"
1.6"
10.6"
5.9"
1.9"
2.0"
I.D.
10.6"
11.8" 5.9"
1.6"
10.6"
DESCRIPTION
150mm Straight Section 300mm Straight Section 300mm Straight Section w/Back Inlet, BSP 300mm Straight Section w/Back Inlet, NPT 300mm x 150mm Tee Section 300mm x 300mm Cross Section, BSP 300mm x 300mm Cross Section, NPT
WEIGHT
(LBS.)
7
14 16 16 19 30 30
ASSEMBLY NUMBERS
CAST IRON
BURNER
BODIES
CORROSION
RESISTANT
BURNER BODIES
102250 102238 102240 102239 102251 102255 102254
102250-1 102238-1 102240-1 102239-1 102251-1 102255-1 102254-1
Burner Sections Assembly Numbers, Dimensions & Weights
LOW PRESSURE
CAST IRON
BURNER BODIES
102250-2 102238-2 102240-2 102239-2 102251-2 102255-2 102254-2

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 3
Figure 3.1 (Continued)
Aluminum Burner Sections
150mm Straight Section 300mm Straight Section 300mm Straight Section
with Back Inlet
11.8"
1.6"
10.6"
11.8" 5.9"
1.6"
2.0"
10.6"
9.6"
9.6"
5.9"
1.6"
10.6"
9.6"
150mm x 300mm Tee Section
300mm x 300mm Cross
11.8" 5.9"
1.6"
10.6"
5.9"
5.9"
1.9"
2.0"
I.D.
2.0" I.D.
10.6"
11.8"
DESCRIPTION
150mm Straight Section 300mm Straight Section 300mm Straight Section w/Back Inlet, BSP 300mm Straight Section w/Back Inlet, NPT 300mm x 150mm Tee Section 300mm x 300mm Cross Section, BSP 300mm x 300mm Cross Section, NPT
WEIGHT
(LBS.)
3.5
7.0 8.0 8.0 9.0
14.0 14.0
ASSEMBLY NUMBERS
ALUMINUM
BURNER
BODIES
102250-3 102238-3 102240-3 102239-3 102251-3 102255-3 102254-3
Burner Sections Assembly Numbers, Dimensions & Weights
LOW PRESSURE
ALUMINUM
BURNER BODIES
102250-4 102238-4 102240-4 102239-4 102251-4 102255-4 102254-4

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 4
Figure 3.1 (Continued)
8.7"
3.9" 0.8"
Pilot, Flame Monitoring and
Burner Feed End Plate Assemblies
Pilot End
with
Flame Rod
Plug
Flame
Rod
Plug
Flame Monitoring End
with
Flame Rod
Pilot End
with
U.V. Scanner
Plain End Plate Assembly
End Plate Assemblies End Plate Examples
(shown with optional UV scanner, flame rod & spark plug installed)
A (pipe thread) C (pipe thread) B (straight thread)
0.8"
8.7"
3.9"
2"
1.3"
2.6"
Ignition
Plug
Flame
Rod
U.V. Scanner
U.V. Scanner
Adaptor
Main Gas
Connection
Ignition
Plug
Main Gas
Connection
1/4" npt
Pilot Gas
Connection
DESCRIPTION
Plain End Plate Pilot End Plate, No Gas Feed Pilot End Plate, 1" Gas Feed NPT Pilot End Plate, 1" Gas Feed BSP Pilot End Plate, 1.5" Gas Feed NPT Pilot End Plate, 1.5" Gas Feed BSP Pilot End Plate, 2" Gas Feed NPT Pilot End Plate, 2" Gas Feed BSP Pilot End Plate, Angled Flame Monitor NPT Pilot End Plate, Angled Flame Monitor BSP Flame Monitoring End Plate, BSP Flame Monitoring End Plate, NPT Burner Feed/Flame Monitoring End Plate, BSP Burner Feed/Flame Monitoring End Plate, NPT Burner Feed End Plate, BSP Burner Feed End Plate, NPT
CAST IRON
END PLATES*
ASSEMBLY NUMBERS
DIMENSIONS
CORROSION
RESISTANT
END PLATES
* Standard Cast Iron End Plates with powder coated surface finish are supplied on burners with aluminum gas manifolds. ** 14mm plug may be replaced by ignition plug for direct spark ignition of burners 450mm (18") or less.
102257
10010970 10010972 10010974 10010975 10010976 10010977 10010978 10010979 10010980
101237 101238 101233 101234 101235 101236
102257-1
10010970-1 10010972-1 10010974-1 10010975-1 10010976-1 10010977-1 10010978-1 10010979-1 10010980-1
101237-1 101238-1 101233-1 101234-1 101235-1 101236-1
WEIGHT
(LBS.)
ABC
— —
1" NPT
1" BSP
1.5"NPT
1.5" BSP
2" NPT
2" BSP
— — — —
1-1/2" BSP
1-1/2" NPT
1-1/2" BSP
1-1/2" NPT
—
14mm 14mm 14mm 14mm 14mm 14mm 14mm 14mm 14mm
— —
** **
— —
—
1" NPT 1" NPT
1" BSP
1" NPT
1" BSP
1" NPT
1" BSP
1" NPT
1" BSP 1" BSP
1" NPT
1" BSP
1" NPT
— —
4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
End Plate Assembly Numbers, Dimensions & Weights
Divider Plate
for Staging
3.9" 5.2"
Ø0.5"
3.1"
DESCRIPTION
PART
NUMBER
Mtg.Brkt. for Hanger Rods Ignition Plug Flame Rod Divider Plate for Staging UV ScannerAdapter – 1/2" NPT UV ScannerAdapter – 3/4" NPT UV ScannerAdapter – 1" NPT Pilot Gas Cock
21509
13047-1
13093 76506
202010 202011
18767 12659
Flame rod ordered with burner includes adapter to pilot or flame monitoring endplate. Adapter fits Eclipse straight,Eclipse 90 and Honeywell C7027A U.V. scanners. Adapter fits Eclipse self-check and Honeywell C7035A U.V. scanners.
Accessories

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 5
Main
Gas
Gas Manifold
Burner
Feed Pipe
Pilot
Gas
Spark
Ignitor
Flame
Rod
Burner Body
Pilot End Plate
Plain
End Plate
Pipe
Union
Pipe
Union
Pipe
Union
Sizing and layout of the gas manifold
Choose the gas manifold size to evenly supply gas to each of the
sections, using Table 3.3 and Figure 3.2.
Table 3.3 Gas Pipe Sizing Layout
Note:
Maximum inputs shown for natural gas only. For propane,
m ultiply inputs by 1.5; for butane, multiply inputs by 1.7.
Figure 3.2 Gas Manifold Sizing & Layo u t
Example: A gas manifold is supplying gas to two 1-1/2" N.P.T. rear
inlets on a burner. Ea h of the rear inlets supplies a maximum of
2,000,000 Btu/hr.
Solution: The total fuel supplied is 2 x 2,000,000 = 4,000,000 Btu/hr.
Referring to Table 3.3, the hoi e for manifold size is 2-1/2"; the
hoi e for main gas pipe size is 2".
MAXIMUM MANIFOLD MAXIMUM MAIN GAS
GAS INPUT PIPE SIZE GAS INPUT PIPE SIZE
(MMBTU/HR.) (INCHES) (MMBTU/HR.) (INCHES)
1.4 1-1/2 0.3 1/2
2.5 2 0. 3/4
5.2 2-1/2 1.1 1
8.0 3 3.2 1-1/2
14.0 4 . 2
45.0 13.0 2-1/2
80.0 8 20.0 3

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 6
Profile plate sizing
Profile plates are required to ensure sufficient air pressure drop across
the burner. An example of pr ofile plate la yout is shown in Figur e 3.4 on
the next page.
Caution:
It is essential that even air flow is delivered to the
burner to obtain optim um performance.
To calculate the pr ofile gap sizes, you will need to now the following:
1) SCFM
= Total air flow around and through the burner in cubic feet
per minute.
2) Design pressure drop acr oss the burner.
3) G
p
= Profile gap ar ea required per flow from Figure 3.3; see Table 3.
for cor rections at higher or lo wer burner air inlet temperatur es.
Profile area, A
g = SCFM x G
p
1000
Where:
A
g
= A rea in square inches of the gap betwee n the profile plates and
the burner.
The areas on the sides of the burners should first be calculated based
on a fix ed gap of 2". Then calculate the gap size required on the top
and bottom to obtain the requir ed profile gap area.
Example: Size a profile plate for a se en-foot long AH-MA 2.00
burner. Air flow around and through the burner will be 60,000 SCFM.
The design pr essure drop is 0.7"w.c.
Note:
Use a burner wing width of 8.9 for pr ofile gap sizing on top and
bottom.
Fr om Figure 3.3: G
p
= 48
A
g
= 60,000 x 48 = 2,880 sq. in.
1,000
Calculate gap sizes:
Side A rea = 2 x 2" x 8.9" = 6 sq. in.
Ar ea Top & Bottom = 2,880  6 = 2,844 sq. in.
There fore, Top & Bottom Gap = 2,844 sq. in. = 16.9 inches
(7 x 12) x 2 gaps
where 7 x 12 = burner length in inches

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 7
Figure 3.3 Profile Gap Area vs. Air Pressure Ga p
Table 3.4 Profile Gap A rea Inlet Air Temperatur e Correction
Figure 3.4 Single Burner Profile Plates
G P @ A IR T EMP . = G P FROM F IG . 3.4 X C ORRECTION F ACTOR
A IR T EMP . (°F) 0 30 70 150 200 250 300 350 400 450
Correction Factor 0.87 0.92 1.00 1.15 1.25 1.34 1.43 1.53 1.62 1.72
110
100
90
80
70
60
50
40
30
20
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
Gp, Profile Gap Area Required
(Sq. In. per 1000’s SCFM)
Combustion Air Pressure Drop ("w.c.)
Burner Air Inlet Temperature @ 70 F
Profile Plate
Duct Width
Duct
Height
6" Min.
9.6"
(244mm)
6" Min.
Gap,As
Required
Gap,As
Required
6" Min.
2"2"
AH-MA Burner

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 8
Figure 3.5 Two-Stage Burner Pr ofile Plates
Profile
Plate
First
Stage
Burner
6" Min.
6" Min. 3" Min.
2"
2"
Profile
Plate
Second
Stage
Burner
2"
6" Min.
XXXX
Duct Wall
Staged Burners
2"
Duct Wall
Steel channel of the correct width can be used as the center profile
plate. Install with the legs pointing toward the incoming air flow.
Air Flow Air Flow
Note:
Make all profile gaps equal (shown as “X” above); profile
plate width between the burners should be at least 3".

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
1 9
Note:
To compensate for changes in actual air flow versus calculated,
provide adjustable pr ofile plates so that f inal settings can be
made in the field. Figure 3.6 sho ws an example of an adjustable
profile plate design.
Figure 3.6 Adjustable Profile Plates
Figure 3.7 Profile Plate Positioning
Fixed
Profile Plate
Duct
Wall
Front ViewSide View
Elongated Screw Slots
AH-MA
Burner
Adjustable
Profile Plate
AH-MA
Burner
Profile
Plate
Profile
Plate
¼ to 1"
Caution:
Profiles plate should be positioned
upstream of the firing end of the
burner. If necessary, the plates can be
located up to 1" back from the firing
end, but under no circumstances should
they be in front of the burner.

Eclipse AH-MA Air Heat Burner v2, Design Guide 160, 8/1/05
2 0
Step 2: Control
Methodology
The simplest control method is fuel modulation at fixed air flow. If
required turndown is greater than the burners capabilities, there
are two options:
1. Air Modulation
To low er the minimum input of the burner, the air flow can be
decreased as long as the pr essure drop acr oss the burner does not
g o outside of the operating limits given in the Operating Ranges
chart in Data Sheet No . 1 0. The air flow can be changed with a
tw o-speed air handling system or a modulated system. A s a n
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. This could
extend the minim um input lev el from 20,000 to 13,000 Btu/hr/ft.
Figure 3.8 Staged Burners
Staging
Divider Plate
Part No. 76506
Stage 2
Main
Gas
Stage 1
Pilot Gas
Pipe
Union
Pipe
Union
Stage 1
Main
Gas
Pipe
Union
Pipe
Union
Pipe
Union