Maxon 400 User Manual
Bulletin 2100
Maxon Model “400” OVENPAK® Gas Burners
Model 415 OVENPAK® Burner
with connecting base and linkage
assembly to adapt customer's automatic
electric control motor
• Burns any clean fuel gas
• Fires into passing air streams
• Requires only low pressure gas
• Provides clean combustion with low NOx levels
• Compact burner design provides quick and easy installation
• Simple field adjustment and maintenance
Model “400” OVENPAK® Burner applications have included:
Air heating in ovens and dryers, paint finishing lines, paper and textile machines,
food baking ovens, coffee roasters, grain dryers, and fume incinerators. Manufactured under
U.S. patent #3,574,508; Canadian and European patents granted and pending.
CORPORATION 201 East 18th Street, P.O. Box 2068, Muncie, Indiana, 47307-0068. Phone: (765) 284-3304. Fax (765) 286-8394
Page 2102
Maxon Model “400” OVENPAK® Gas Burners
Provide application flexibility with:
• 40:1 turndown or more
• Over 90 different styles and sizes
• Heat releases to 16,500,000 Btu/hr
• Cost-effective external blower (EB) version
Model EB-3 OVENPAK® Burner with
connecting base and linkage assembly
Typical piping layout with “Block and Bleed” gas train arrangement
Page 2103
Maxon Pre-Assembled Package
Model “400” OVENPAK® Gas Burner System
Model 435
OVENPAK®
Burner with preassembled “Block
& Bleed” pipe
train and prewired into
package system
• A complete “packaged burner” system for maximum efficiency
• Pre-assembled system includes:
– High turndown Model “400” OVENPAK
® Burner
– Completely assembled and pre-wired pipe train package
• Fast and easy installation with your choice of mounting options:
– Arranged for mounting onto your existing duct;
– Or mounted by Maxon in a pre-fabricated combustion heater/duct
Page 2104
Maxon Packaged Heater/Duct Sections
for Pre-Assembled OVENPAK® Gas Burner Systems
Model 425
OVENPAK® Burner
pre-assembled
package system,
installed and mounted
onto a Maxon prefabricated heater/duct
section
• Reduce your fabrication time and costly design details
• Easy mounting provided by flanged duct connection joints
• Application flexibility offered by:
– Three duct sizes
– Five capacity options
– Optional return/inlet duct opening positions
• Discharge air volumes up to 12,000 SCFM
• Handles discharge air temperatures up to 600°F (316°C)
12/89
CORPORATION 201 East 18th Street, P.O. Box 2068, Muncie, Indiana, 47307-0068. Phone: (765) 284-3304. Fax (765) 286-8394
Model “400” OVENPAK
®
Gas Burner Page 2105
Design and Application Details
OVENPAK® Burners are nozzle-mixing gas burners
for many industrial direct-fired applications where
clean combustion and high turndown are required.
They are simple and versatile for use on a variety of
heating applications.
The Model “400” OVENPAK® Burner (shown at
right) includes a combustion air blower with nonsparking paddle wheel-type impeller, pilot, spark
ignitor, stainless steel discharge sleeve, mixing cone,
self-contained internal air and gas proportioning
valves, and provision for your flame safeguard
sensor.
Right: Model 415 OVENPAK® Gas Burner with optional:
• combustion air filter
• connecting base and linkage assembly
• electrical control motor (by others)
Cross sectional view of a Model “400” OVENPAK® Gas
Burner
Principle of operation (illustrated at left)
The OVENPAK® Burner is designed for industrial
air heating applications. It is available in two basic
versions: 1) packaged with integral combustion air
blower, or 2) for use with an external blower. Both
versions include a gas and air valve, internally linked
together to control the gas-air ratio over the full
operating range. The gas flows through the nozzle,
then along the inside of the burner cone where
combustion air is progressively and tangentially mixed
with the gas. This produces a very wide turndown
range and a highly stable flame under a variety of
operating conditions.
10/92
Page 2106 Model “400” OVENPAK® Gas Burners
Design and Application Details
Model “EB” (external blower) OVENPAK® Burners
(shown at right), like all OVENPAK® Burner assemblies, are designed to deliver heat through a patented
mixing cone and stainless steel sleeve.
Flanged burner body design on all OVENPAK
Burner assemblies simplifies mounting and installation on your application. Burner can be installed in
any position that does not conflict with your control
motor or flame detector requirements.
Minimal torque requirements permit use of most
electric or air operators in conjunction with the optional (Maxon supplied) connecting base and linkage
assemblies.
Model “EB-MA” OVENPAK® Burner with discharge sleeve
and optional manual gas control
®
view into
cone of
EB version
Model EB-3 OVENPAK® Burner arranged for external
blower source with connecting base and linkage assembly
to adapt customer's automatic control motor
“400-MA” and “EB-MA” versions
Model “400-MA” versions include a combustion air
blower in your choice of the voltages shown on page
2107, but provide constant combustion air volumes.
They differ from “standard” versions by use of a
slotted adjustable air butterfly locking device as
shown in photo at left. Internally, the linkage normally
cross-connecting air and gas butterflies is omitted.
In normal operation, the air butterfly is set to the
desired air differential pressure, and the fuel only is
throttled by a separate control valve. Maximum
capacities match those cataloged for “standard”
burners of equivalent size. Minimum capacities with
full air flow will be higher than those of “standard”
burner.
“EB-MRV” versions (photo at right)
“EB-MRV” versions of OVENPAK® Burners permit
air/fuel ratio control via a Maxon MICRO-RATIO®
control valve throughout the firing range. They differ
from standard “EB” burners in that internal gas and air
butterflies and the related shafts and linkages are
omitted.
In normal operation, air and fuel will be proportioned by an external Maxon MICRO-RATIO® Control
valve.
Maximum capacities match those cataloged for
“EB” burners of equivalent size and differential air
pressure. Minimum capacity and air differential
pressure will vary with your application.
Model “EB-MRV” OVENPAK® Burner with optional 12"
discharge sleeve
®
Gas Burners
Page 2107Model “400” OVENPAK
Capacities and Specifications – 60 Hertz
Standard Model “400” OVENPAK® Burner in-
cludes a combustion air blower with motor.
Maximum capacity of Model “400” OVENPAK
®
Burner is affected by the static pressure within the
combustion chamber. Data shown assumes firing in
the open, or into an airstream with enough oxygen to
complete the combustion process. If burner is fired into
an oxygen-starved chamber or airstream, capacities
may be reduced as much as 25-30%. Do not attempt
to operate beyond the duct static pressure range
shown. For higher back pressure applications, select
from Model “EB” or “EB-MRV” OVENPAK® Burner
options.
All gas pressures are differential pressures and
are measured at the gas pressure test connection on
the backplate of each OVENPAK
®
Burner. Differential
pressures shown are approximate.
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Page 2108 Model “400” OVENPAK® Gas Burners
Capacities and Specifications – 60 Hertz
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Page 2109Model “400” OVENPAK® Gas Burners
Capacities and Specifications – 50 Hertz
Standard Model “400” OVENPAK
®
Burner includes a combustion air blower
with motor.
Maximum capacity of Model “400”
OVENPAK
®
Burner is affected by the static
pressure within the combustion chamber.
Data shown assumes firing in the open, or
into an airstream with enough oxygen to
complete the combustion process. If burner
is fired into an oxygen-starved chamber or
airstream, capacities may be reduced as
much as 25-30%. Do not attempt to operate
beyond the duct static pressure range
shown. For higher back pressure applications, select from Model “EB” or “EB-MRV”
OVENPAK
®
Burner options.
All gas pressures are differential
pressures and are measured at the gas
pressure test connection on the backplate
of each OVENPAK® Burner. Differential
pressures shown are approximate.
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Page 2110 Model “400” OVENPAK® Gas Burners
Capacities and Specifications – 50 Hertz
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Gas Burners
Capacities and Specifications
External Blower (EB) versions
Page 2111Model “400” OVENPAK
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Page 2112 Model “400” OVENPAK® Gas Burners
Capacities and Specifications
External Blower (EB) versions
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Gas Burners
Accessory Options
Air filter assemblies and silencers
Page 2113Model “400” OVENPAK
Air filter assemblies help to trap airborne particu-
late matter. They are offered with washable replaceable
filter elements or with permanent metallic elements (as
shown in photograph above). Filters mount onto
OVENPAK
®
Burner's blower housing (or silencer
housing of burners so equipped) and surround the
blower motor and combustion air inlet.
dB(A) sound levels
from actual tests conducted at full-rated 60 Hz
capacity are shown in table
at right. Measurement point
is shown in sketch below.
(Meter was set to A-scale,
slow response.)
Operation on 50 Hz
power results in lower
rotational speed of blower,
and so reduces air output,
capacity, and resulting
noise levels. 50 Hz noise
levels should not exceed
the above data measured
on 60 Hz operation.
Burner
Model
405
407M
408M
408
412M
413M
415
422M
425
432M
435
442M
445
456M
470M
487M
Sound Level dB(A)
Standard
Burner
84
83
84
87
81
82
89
88
89
88
87
89
89
90
92
94
with
Silencer
75
77
75
78
73
72
77
79
78
80
78
80
81
83
83
85
Filter silencers help reduce noise levels. They
mount onto OVENPAK® Burner's blower housing and
enclose the blower motor and combustion air inlet (as
shown in above photograph). They can be furnished in
conjunction with a permanent or replaceable filter
element assembly described above.
6/96
Page 2114 Model “400” OVENPAK® Gas Burners
Accessory Options
Universal Joint Arrangements (for all
versions except EB-MRV) allow control of as many as
5 burners by a single control motor. Torque requirement is 10 in-lbs for EACH burner driven. Primary
burner should drive no more than 2 Secondary burners
to either side of itself.
Miniature universal joints simplify burner alignment.
Aluminum connecting rod can be cut to fit actual
burner spacing. (
burner centerlines is 21" – 33" for 422M and smaller,
23.5" – 36" for larger burners.)
1. Primary and secondary burners
2. Any other accessories desired
3. Required quantity of Universal Joint Assemblies
Allowable distance between adjacent
To order, specify:
Auxiliary Switches
Maxon offers 4 types, all cam-actuated by the
burner main operating shaft. (If Universal Joint Arrangements are used, switch must mount on furthest
left burner.) Field installation MAY require burner
modification per instructions provided in Product
Information Sheet 2000-7/8.
Low Fire Start Switch Assembly (SPDT) opens
the circuit when burner leaves minimum position. Also
available in Weatherproof and Hazardous Location/
Weatherproof versions.
High and Low Fire Position Switch Assembly
includes 2 SPDT switches. One switch may be fieldset to activate at high fire position, while other is set to
activate at low fire position. Switch assemblies are
also available in a weatherproof version.
Manual Handle Kit permits setting and locking
air and fuel valves at a constant firing rate. See photo
below.
Low Fire Start Switch shown
Discharge Sleeve Mounting Gaskets
Standard discharge sleeve gasket provides
adequate sealing in most applications.
High Back Pressure Gasket Kit includes 2 additional gaskets to provide sealing against back pressures as shown in sketch below.
Standard
Arrangement
High Back Pressure Kit
With
Model “400” OVENPAK® Gas Burners
Accessory Options
Page 2115
Hi/Lo Control Motor Sets for high or low firing.
Optional set includes 2-position unidirectional 11second 120v 50/60 Hz motor and connecting base with
mounting linkage. See table below for dimensions
which differ from standard burner.
sehcnInisnoisnemiD
2,1-BEM314-504
3-BEM224-514
5,4-BEM244ot524
7,6-BEM784-544
ledoMrenruB
PRT
52.0136.7157.7
91.0165.7157.7
96.1160.9157.8
96.6160.4257.8
Discharge Sleeves are available in 3 versions:
– Standard sleeve is 8" long, made of #310 SS, and
is suitable for downstream temperatures up to
1000°F (538°C).
– For higher velocities, specify 12" long sleeve made
of #310 SS for downstream temperatures up to
1000°F (538°C).
– For higher downstream temperatures between
1000°F (538°C) and 1500°F (816°C), specify 8" long,
#RA 330 SS sleeve.
9/94
Page 2116 Model “400” OVENPAK® Gas Burners
Dimensions (in Inches)
Model “400” and “400-MA” OVENPAK® Burners
NOTE: Use of auxiliary switches will add to dimension D.
ledoMA*BCDEF GHJK LMN CCDDEEFFGGHHJJKK
504
M704
804
57.31
M804
M214
M314
514
57.44/1-196.718.852.0173.0152.873.0144.4
M224
524
M234
534
M244
544
M654
M074
M784
2/1-1
57.5
2
18.683.4188.6113.9126.415.652.2157.4196.673.5
3 57.7197.719118.6249.52
44.5
60.626.8
TPNtelnisagleufniaM*
26.678.803.01
60.0188.1196.4105.2144.552.015.2126.5
44.8
91.31
73.4
13.644.826.3
52.0
73.0
18.873.114166.3
52.5178.518196.496.9196.1226.81
18.873.114166.321.9118.7173.4160.71
52.5178.518196.4
18.873.1141
52.5178.51
21.2144.4149.3
52.5178.5118.252.1265.3226.92
21.2144.4149.35.0252.0257.91
52.5178.51
95.313.71
81
18.252.1265.32
42
13.71
13.71
21.91
52.81
5.22
18.7173.4160.71
96.9196.1226.81
57.7173.4160.71
65.9196.1226.81
5.0252.0257.91
525.32
26.92
Pipe threads on this page conform to NPT (ANSI Standard B2.1)
Dimensions (in Inches)
Model EB, EB-MA, and EB-MRV OVENPAK
Page 2117Model “400” OVENPAK® Gas Burners
®
Burners
NOTE: Use of auxiliary switches will add to dimension D.
ledoMABCDEFGHJKLMNUVWXYAABB
1-BE
57.3
2-BE
3-BE
4-BE
5-BE
6-BE
7-BE
4/1-144.5
57.496.773.0152.873.0144.483.5
57.52
18.63 83.4188.6113.9126.415.652.2157.4196.626.921.11
60.626.8
26.6
78.813.0191.31
60.0188.1196.415.2144.552.015.2126.5
44.8
73.4
13.644.826.3
Pipe threads on this page conform to NPT (ANSI Standard B2.1)
52.052.726.873.644.044.5
52.926.0178.8
73.0
65.0
-7.11
5
44.5
57.766
52.015.88
4
1/98
Page 2118 Model “400” OVENPAK® Gas Burners
Accessory Dimensions (in Inches)
Filter with silencer for Model “400” OVENPAK® Burner
ledoMJJLLMMNNPPRRSSTTUU
504
M704
804
M804
M214
M314
514
M224
524
M234
534
M244
544
M654
M074
M784
4.414.21
7.121.519.128.77.424.131.53
4.414.213.914.012.329.926.33
7.121.519.128.77.424.131.53
4.414.213.914.01
7.121.51
2.025.413.8429.526.233.63
6.321.81229.428.019.429.135.833.24
52.025.41614.123.8429.526.233.63
6.32
5.32 6.82
9.522.02422.928.216.929.337.243.44
1.81229.428.01
61
3.914.01
9.12
2.329.926.33
2.32
8.77.424.131.53
1.32
9.42
2.329.926.33
9.135.833.24
Pipe threads on this page conform to NPT (ANSI Standard B2.1)
Component Identification
Page 2119Model “400” OVENPAK® Gas Burners
Suggested spare parts
– Spark Ignitor – Discharge Sleeve and Gasket
– Flame Rod, if used – Motor
– Filter Elements, if used – Impeller
– Mixing Cone – Gas/Air Valve Linkage Kit
To order parts for an existing OVENPAK® Burner assembly, list:
1. Name(s) of part(s) from above illustration
2. Quantity of each required
3. OVENPAK® Burner nameplate information:
• size and model number of burner
• assembly number
• date of manufacture
• if available, serial number of Maxon fuel shut-off valve in-line to OVENPAK
Burner (This serial number is on Maxon valve's nameplate.)
9/03
Nameplate
®
Page 2120 Model “400” OVENPAK® Gas Burners
Suggested Maintenance/Inspection Procedures
Discharge sleeve and cone alignment
Centering of the mixing cone provides a small
annular opening for the flow of some cooling combustion air along the discharge sleeve wall. We SUGGEST
periodic inspection from the discharge side of the
burner to assure that this alignment is maintained.
Caution: Tightening can lead to cone distortion
and greatly reduce cone and discharge sleeve
life. Cone should be free to move and allow for
thermal expansion.
If re-adjustment is necessary, back out the four lock
nuts and re-center mixing cone with adjusting screws
handtight. Back each screw out one-half turn before relocking. This allows for thermal expansion as cone
gets hot.
Filters should be inspected regularly and cleaned,
using a vacuum to remove loose/dry accumulations,
then washing and/or degreasing as appropriate for the
filter type used.
To replace flame rod or spark ignitor:
1. Check Table 1 at right for dimension “Y” and cut tip
to length shown.
2. Insert 1/2" NPT collar into burner and snug into
position.
3. Insert insulator through collar into burner.
4. Check table for dimension “X”, position accordingly,
and tighten locking bushing until insulator is held
firmly.
WARNING: Over-tightening locking bushing may
damage insulator.
NOTE: A full-wave 6000 volt spark ignition transformer
is suggested for use with Maxon burner equipment.
Flame Rod
NOTE: 1/2" x 1" adapter bushing supplied by others
Table 1: Flame rod and spark ignitor dimensions
for all Model “400” OVENPAK® Burners
manufactured after 1/1/91 ①
rotingIkrapS
ledoMrenruB
XYXYZ
504
M704
1-BE
2-BE
3-BE
4-BE
5-BE
6-BE
7-BE
M804
804
M214
M314
514
M224
524
M234
534
M244
544
M654
M074
M784
3.14.
5.14.
2.14.8.8.015.3
3.14.4.8.219.2
snoisnemiD
4.69.2
doRemalF
snoisnemiD
①
Manufactured date is stamped on metal nameplate
of Model “400” OVENPAK® Burner. For specifics
relative to units manufactured prior to 1/1/91, see
Product Information Sheet 2100-3.
Page 2121Model “400” OVENPAK® Gas Burners
Maxon Pre-Assembled P acka ge
Model “400” OVENP AK® Gas Burner System
Save time and reduce your installation costs with a
completely assembled and pre-wired burner and pipe
train “package”.
All system components have been carefully selected to match the high performance characteristics of
the Model “400” OVENPAK® Gas Burner.
The compact design of this “packaged system”
makes mounting to your duct fast and easy. Connect
to the gas line and bring in electricity. It's wired and
piped, ready to go.
425 OVENPAK
package system
installed and
mounted onto a
Maxon
pre-fabricated
heater/duct section
All pre-assembled package systems include a
Model “400” OVENPAK® Burner and pipe train. The
pipe trains are available with “Block and Bleed” arrangement options only.
Additional application flexibility is provided with five
different sized systems, all with 40:1 turndown
capacity ranges.
Packaged OVENPAK® Burner systems may also be
mounted in a pre-fabricated combustion heater/duct
section by Maxon. This option is value-engineered to
give you the most for your dollar spent.
®
6/03
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