CaptiveAire HMA-2 Installation Manual
The Blue Flame Series
Make-Up Air Engineering Manual
Midco International Inc.
4140 West Victoria Street Chicago, Illinois 60646
tel 773.604.8700 fax 773.604.4070
web www.midco-intl.com e-mail sales@midco-intl.com
HMA-2
Quality Designed for Proven Performance
703
8471 34
Printed in USA
Reduced NO2and CO Emissions: Lower emissions
levels that easily pass the new ANSI Z83.4 and Z83.18
standards.
Higher Temperature Rise: The two stage combustion
process lowers NO
2
emissions which is the limiting
factor in temperature rise. (See page 3)
Increased Capacity: Up to 750,000 BTU'S per foot.
(Higher BTU levels can be achieved if ANSI Z83
Standards for CO and NO
2
emissions are not of a
concern. Process heaters can fire up to 1,000,000
BTU'S a foot or more.)
Increased Differential Pressure Drop and Higher
Velocities: HMA-2 burners can operate between 0.05"
to 1.4" W.C. differential pressure range or in air
velocity between 800 fpm to 4000 fpm.
Flame Stability: Two st age combustion provides better
flame stability and emission control, allowing for a
shorter flame and easier profile configuration.
Reduced Inventory Costs: Single burner casting can
be fired with natural, propane or butane gas
1
, reducing
burner inventory.
Reduced Shipping Costs: A smaller, lighter casting
than the competition’s, can cut your freight costs up to
50%.
Turndown: 30-1 turndown can easily be achieved with
proper modulating controls and valves. (Higher
turndown possible depending on equipment design.)
1
Consult Midco for applications using butane fuels.
DIRECT FIRED MAKE-UPAIR BURNERS are used in
industrial and commercial applications to maintain the
desired environmental temperatures required by critical
processes i.e. health purposes, production systems,
quality control, comfort and loss prevention where it is
necessary or required to exhaust large amounts of
conditioned air.
Make-up Air Systems used as stand alone heating
systems or operating in combination with central
heating plants systems can be cost effective in three
ways: 1) reducing the initial expenditures, 2) tempering
incoming air which may extend the life of expensive
central heating plants and 3) reducing excessive
equipment cycling or premature component failures
due to increased heating demands.
Our innovative two stage combustion burner is not
just a modification or improvement of the old, but a
completely new approach to direct-fired combustion.
The two-stage combustion improves control of the
flame process, meets or exceeds the new ANSI
Standards while outperforming the competition. By
incorporating two separate flames within the burner
combustion zone, the flame is more stable, shorter
and cleaner, permitting the reduction of emissions
levels and allowing for higher temperature rise and
higher tolerance to varying conditions when placed in
the profile opening.
Features and Benefits
New Technology in
Direct-Fired Gas Burners
Patent Pending
#10/306,199
Specifications
2
*Firing Rate .............................................................. Up to 750,000 Btu/hr/ft
750,000 + Contact Midco
Burner Manifold Pressure
Natural Gas ................................................. 4.2 to 8 inch W.C.
Propane Gas .............................................. 1.6 to 3 inch W.C.
Pilot Capacity ............................................................ 12,000 Btu/hr
Pilot Manifold Gas Pressure
Natural Gas ................................................. 3.5 inch W.C.
Propane Gas .............................................. 2.0 inch W.C. **
Pressure Drop Across the Burner ............................ 0.05 to 1.4 inch W.C.
Air Velocity Across the Burner ................................... 800 to 4,000 FPM
Burner Turn-down Ratio ........................................... 30 to 1
Flame Length ............................................................. 10 inches at a full firing rate
* Firing rate is dependent on the pressure across the burner. Please see the included
charts for recommended burner sizing.
** Using a natural gas pilot on propane.
*Burner Configurations *Pilot Configurations
Part # Part #
6 inch Straight Section (15.24cm) 1050700 Spark rod and flame rod 1190800
6 inch Straight Section with Back Inlet (15.24cm) 1230700 Spark rod and UV 1200300
12 inch Straight Section (30.48cm) 1010700 Remote flame rod 1220800
12 inch Straight Section with Back Inlet(30.48cm) 1060700 Remote UV 1240800
Elbow Section 1070700 Pilot with spark rod only 1210800
Tee Section 1080700 Flame rod 1360-03
Spark rod 1342-00
Table 1 - Burner and Pilot Configurations
Midco International Inc. reserves the right to change the construction or configuration of its products at
any time.
All information is based on laboratory testing. Different unit size and/or configurations may affect data.
* See Page 15, Figure 1b for configuration reference.
Burner Performance
3
______________________________________________
Chart 1 - CO and NO2Emissions Data
*For temperature rise up to 160°F that meets the ANSI Z83 standards contact Midco.
4
Installation
Chart 3 - BTU's verses Gas Pressure ( " W.C.)
Chart 4 - Pressure Across the Burner verses Profile Velocity
Chart 2 - BTU's verses Pressure Drop
1. Required BTU:
BTU/hr = Blower SCFM x Desired Temp. Rise x 1.08
2. Required Burner Length:
Feet of burner = [Required BTU/hr]÷[Burner Firing Rate (BTU/hr/ft)]
The Burner Firing Rate should correspond to the pressure drop across the burner
shown in Chart 2.
3. Required Profile Area:
Total Burner Area = Number of burner sections x burner area
Net Profile Area = Rated Fan (SCFM) ÷ Profile Velocity (SFPM)
The Profile Velocity can be determined from the following:
∆ P is the pressure drop across the burner
Profile Area = Net Profile Area + Total Burner Area
______________________________________________
Sizing the burner and the corresponding profile for a 5,000 SCFM and a 115 degrees
temperature rise.
1. Required BTU:
BTU/hr = Blower SCFM x Desired Temp. Rise x 1.08
BTU/hr =5,000 (SCFM) x 115 (∆T) x1.08 = 621,000 BTU/hr
2. Required Burner Length:
Feet of burner = [Required BTU/hr]÷[Burner Firing Rate (BTU/hr/ft)]
To determine the optimum burner length we can choose from a combination of 12
inch or 6 inch burner sections referring to Table 1. We can either fire the burner
at a rate of 621,000 BTU/hr per ft, or we can fire the burner at 414,000 BTU/hr per ft
(1.5 feet of burner). Refer to Chart 3 for the fuel pressures requirements at different
firing rates.
3. Required Profile Area:
Total Burner Area = Number of burner sections x burner area
Total Burner Area = 1.0 (ft) x 0.65 = 0.650 ft
2
Or
Total Burner Area = 1.5 (ft) x 0.65 = 0.975 ft
2
5
Profile Setup Example
Profile Setup
Installation
(Burner Section) Burner Area
6 inch 0.32 sq. ft.
12 inch 0.65 sq. ft.
T Section 0.77 sq. ft.
Ell Section) 0.65 sq. ft.
(Burner Section) Burner Area
6 inch 0.32 sq. ft.
12 inch 0.65 sq. ft.
T Section 0.77 sq. ft.
Ell Section 0.65 sq. ft.
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