Main Air Capacity, 

Required Jet Air

§

 

Approx. Flame Lengths

 

Burner 

Main Air 

scfh at 16 osi 

scfh at 

with 16 osi Main Air

 designation 

pipe 

size

 

Ambient 

1000°F 

8 osi 

16 osi 

Ambient  

1000°F     

 4825-2

      

4"  

2 560  

1 420  

50 

— 

2

½  

    

2

 4825-3

      

4"  

3 990  

2 370  

70 

— 

2

½  

    

2

 4825-4

      

4"  

6 150 

 3 930 

145 

— 

2

½  

    

2

½  

 4825-5

      

4" 

10 600  

6 450 

165 

— 

2     

2

½  

 4825-6

      

4" 

16 700 

10 050 

— 

155 

5     

3

½  

 4825-7-A 

6" 

27 400 

17 100 

— 

175 

5     

4

 4825-7-B 

6" 

34 100 

21 000 

— 

275 

5

½  

    

4

½  

 4825-8-A 

6" 

44 200 

27 900 

— 

450 

5

½  

    

4

½  

† Smaller main air piping can be used in most cases. Use standard sizing methods for air temperature and pressure available. Minimum main air pressure 

at the burner is 0.2 osi.

§ Ambient temperature jet air is required at all fi ring rates for burner stability and fl ame integrity.

4825 Burners will handle 1200°F preheated combustion air 
fi ring car bottom, aluminum melting, forging, glass melting, 
heat  treating, and other furnaces where standard 4422 or 4425 
Burners would be used if combustion air were not preheated.

Burners provide stable combustion in cold tight furnaces on 
 stoichiometric ratio, with large quantities of excess air, or on 
 moderately fuel-rich ratios. Air is evenly distributed around the 
gas stream,  creating uniform combustion and a well-defi ned 
fl ame pattern  throughout a wide turndown range.

Flames are clear to semi-luminous dependent on air tempera-
ture, fi ring rate, and air/fuel ratio.

CONTROL

Mass fl ow control systems with air temperature compensation 
 provide the most reliable fuel effi

  ciency.

Fully metered fl ow control arrangements on the cold air side--
such as 7288 Regulators or 8096 Combustion Controllers--are 
satisfactory for the vast majority of installations.

Because 4825 Burners are capable of lean starts on cold air, 
 standard cross connected regulators can be used on many batch 
 operations, as well as on continuous furnaces with constant 
preheated air temperatures.

JET AIR

The burner uses a small amount of ambient air to insure good 
fl ame thrust at low fi re. Some burners lose all discharge  velocity 
on  applications that require wide turndown. Jet air on the 4825 
solves that problem. Additionally, jet air cools internal parts 
and prevents the cracking of fuel at low fi re caused by hot 
 combustion air.

Burner sizes -2 thru -5 require jet air at 8 osi pressure while 
sizes  -6 thru -8-A require 16 osi. Regardless of fi ring rate, jet air 
fl ow is constant at about 2 percent of high-fi re air rate (ambient 
 temperature) for -5 and smaller burners, and 1 percent for -6 and 
larger burners.

RECUPERATORS

4825 Burners are compatible with almost all recuperators, 
 including North American 8483, 8485, and 8486 units.

IGNITION/FLAME SUPERVISION

A 4011-12 pilot set is recommended for individual burner ignition. 
When multiple burners share a single pilot pre-mix header, a 
4021-12 pilot tip per burner with an appropriately sized air/gas 
mixer is recommended.

For higher ambient temperatures specify a Honeywell C7035A 
UV with an 8837-F Adapter, which includes a Honeywell heat 
block #136733 (R130-5849) and a 

¼  

" fpt for 100 cfh cooling air.

CONSTRUCTION

Heat resistant cast iron burner bodies including air connections 
are lined internally with vacuum-formed ceramic fi ber  insulation. 
Burner tiles are 3000°F castable with or without self- supporting 
construction and are easily replaceable in the fi eld. Burner air 
tubes, of high temperature alloy, are protected by a refractory 
radiation shield.

Bulletin 4825

page 2

Product Overview | Hot Air Burners

Catalog Combustion 2021 - Page 0478

Fives Group
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