Figure 1. Suggested piping arrangement for 6422 and 6514 Burners for gas and/or light oil.

North American Fire

All™Dual-Fuel™ Burners

Instructions 6422

1.Requirements:

     

 

a) Maximum allowable inlet pressure to the air/gas ratio 

 

  regulator (Bul. 7216 or 7218) is 32 osi. If greater than

 

  32 osi, an upstream pressure regulator (not shown) must be 

used.

     
 

b) Gas supply pressure to the air/gas ratio regulator should 

be at least 2 osi greater than the high fi re burner air pres-
sure. If less, a bleeder (Bul. 8654/8655) must be installed in 
the impulse line. See Figure 2.

    
 

c) Fuel oil must be supplied to the air/oil Ratiotrol™ (Bul. 7052) 

at 25-30 psi. Oil should be supplied from a circulating sys-
tem controlled by a diaphragm relief valve.

     
 

d) Atomizing air pressure at burner must be at least 14 osi.

     
 

e) Consult your insurer or your local Fives North American 

Combustion, Inc. fi eld engineer for automatic shutoff  and 
fl ame supervision requirements.

2.Burner Mounting:

 
 

a) Burners should be mounted with air, gas, pilot, and UV 

connections on the top or side to prevent oil dripping into 

them.

 

 

b) WARNING: Burners cannot be rotated with respect to 

 

  the mounting plate as the pilot and fl ame detector ports 

must align with notches in the plate.

 

 

c) To minimize leaks around the tile and to prevent tile dam-

age from thermal expansion of the wall, follow the 

 

  instructions on Supplements DF-M1 and DF-M2.

3.Piping:

 

a) Minimize piping pressure losses. Use a minimum of elbows. 

Substitute 45 elbows for 90 elbows when possible. Do not 

use street elbows. Use pipe (not tubing) for pilot air and 

gas lines. 

3⁄8

" tubing may be used for impulse lines up to 8 

long, 

½  

" tubing or larger for longer runs.

 
 

b) Pipe air and fuel lines in a manner similar to that shown in 

Figure 1. Flexible connections (Bul. 8770) are recommended 

in air and fuel lines to minimize strain from piping and ther-

mal expansion.

 
 

c) Pilot air, pilot gas, and atomizing air supply connections 

must be made upstream of primary burner controls so they 

are not aff ected by the zone air control and gas shutoff  

valves.

 
 

d) Connect impulse piping as shown in Figure 1 (or as in 

 

  Figure 2 if a bleeder is used). These piping arrangements 

are designed to keep air and gas fl ows on desired ratio at 

all fi ring rates. (Ref: Bulletin 7216, Instructions 7218 and Bul. 

8654/8655.)

 
 

e) Ratio regulator impulse line connections must be located 

between the zone control air valve and the manual burner 

air valve for multiple burner zones and downstream of the 

manual burner air valve for single burners.

INSTALLATION

#2 Fuel Oil

25-30 psi

Gas
2 psi Max.

7052

8521-01

7216 or 7218

1807

8697

8598A

1126

1813

Zone A (1 Burner)

1122

8598A

Zone B (2 Burners)

Main Air

1122

Atom. Air

16 osi Min.

1122

ENERG

Y | C

OMBUSITION

Catalog Combustion 2021 - Page 0731

Fives Group
FIVES GROUP
FIVES GROUP-FIVES GROUP-0731-0735

Request Quote

Please provide additional information
Company: *
Name: *
Email: *
Telephone:
Product:
Message:


Privacy Policy and Terms of Service apply.

Fives Group Part Numbers on this Catalog Page
Line Part Number Manufacturer Request Quote
1 8654/8655 Fives Group Request Quote