Dimensions | Dual-Fuel ™ Burners
DIMENSIONS inches
¾ NPT for flame detector and Observation Port (45° to mtg. plate)
3 19⁄32 rad.
E
Recommended Sensitrol™ Oil Valve
6425 cylindrical hole T –dia.
¾ NPT for Pilot Tip (45° to mtg. plate)
¾ wide slotted holes on cast mtg. plates
P
45°
6425- -MB Milk Bottle shaped hole U –dia.
Q
H
1 1⁄8
G
D sq.
45°
P
F
C –NPT Atomizing Air
B –NPT Gas
3⁄8 NPT Oil
8– 3⁄8 bolts on 7 ½ BC (-2 thru -6) 8– ½ bolts on 9 3⁄8 BC (-7-A thru -8-A)
1⁄8 press. tap
A –NPT Main Air
J
P
P
K
9" long for 6425 13 ½ " longfor 6425- -MB
2 9⁄16
R
R
L
S sq.
M
N
NOTE : For 6425-8-A, the air and gas connections cannot be piped in the same plane, as shown on other side, because the "flower pot" type air connection flange would interfere with the 2 ½ " gas line.
DIMENSIONS SHOWN ARE SUBJECT TO CHANGE. PLEASE OBTAIN CERTIFIED PRINTS FROM FIVES NORTH AMERICAN COMBUSTION, INC. IF SPACE LIMITATIONS OR OTHER CONSIDERATIONS MAKE EXACT DIMENSION(S) CRITICAL .
Burner designation
D
M
N 18 3⁄8 18 3⁄8 18 3⁄8 18 3⁄8 18 3⁄8 22 5⁄8 22 5⁄8 22 5⁄8
A
B
C
E
F
G
H
J
K
L
6425-2 6425-3 6425-4 6425-5 6425-6
1 ¼ 1 ½
1 1
8 ½ 8 ½ 8 ½ 8 ½ 8 ½
5 ¼ 5 ¼ 5 ¼ 5 ¼
2 2 2 2 2
1 3⁄8 1 3⁄8 1 3⁄8 1 3⁄8 1 3⁄8 2 1⁄8 2 1⁄8 1 ¾
4 3⁄8 4 3⁄8 4 3⁄8 4 3⁄8 4 3⁄8 5 7⁄8 5 7⁄8 5 7⁄8
8 3⁄8 8 3⁄8 8 3⁄8 8 3⁄8 8 3⁄8
11 5⁄16 11 5⁄16 11 5⁄16 11 5⁄16 11 5⁄16 15 1⁄8 15 1⁄8 15 1⁄8
15 13⁄16 15 13⁄16 15 13⁄16 15 13⁄16 15 13⁄16 20 1⁄16 20 1⁄16 20 1⁄16
¾ ¾ ¾
½ ½ ½ ½ ½
2
1 ¼ 1 ½ 1 ½ 2 ½ 2 ½ 2 ½
2 ½
1 1
3 4 4 6
5 9⁄16 6 15⁄16 6 15⁄16
6425-7-A 6425-7-B 6425-8-A
1 ¼ 1 ¼
10 10 10
2 5⁄8 2 5⁄8 2 5⁄8
11 11 11
9⁄16 9⁄16 9⁄16
2
10 11⁄16
approx. flame lengths * with 16 osi Main Air (in open furnace)
Recommended
Sensitrol ™ Oil Valve 1813-02-A 1813-02-A 1813-02-A 1813-02-A 1813-02-B 1813-02-C 1813-02-C 1813-02-D
Burner
wt,
designation
P
Q
R
S
T 5 5 5 5 5 7 7 7
U 3 3 3 3 3
in lb
gas
oil
6425-2 6425-3 6425-4 6425-5 6425-6
5 ¼ 5 ¼ 5 ¼ 5 ¼ 5 ¼ 6 1⁄8 6 1⁄8 6 1⁄8
10 ½ 10 ½ 10 ½ 10 ½ 10 ½ 12 ¼ 12 ¼ 12 ¼
6 6 6 6 6
12 12 12 12 12
83 83 83 83 83
½ '
1 ½ '
1 ½ '
2'
2'
2 ½ '
2 ½ '
3' 4' 6' 6' 7'
3' 5' 6' 7'
6425-7-A 6425-7-B 6425-8-A
6 ¾ 6 ¾ 6 ¾
13 ½ 13 ½ 13 ½
4 ½ 4 ½
139 139 145
–
All burners use 4011-11 or 4011-12 Pilot Tips. 6425- -MB Burners have a 1⁄16 " gasket between mounting plate and burner body. Pilot, flame detector, and Observation Port positions are interchangeable as long as Pilot and flame detector are in adjacent holes. Opening in furnace shell should be about ½ " larger than dimension D to allow for fillets and draft on mounting plate. ¼ " air pressure tap on -2, -3, -4, -5 and -6. Dimensions M and N assume use of a 3⁄8 " close nipple (not furnished by North American) between burner and Sensitrol TM Valve. Metal tubing is available as an extra cost option (order as PN 3-0310-7). Optional (recommended) Sensitrol Oil Valve is not included as part of the burner assembly, and must be ordered separately.
* 6425 Burners with standard tiles
Tiles for 6425 Burners
Standard
Milk Bottle
Burner
70% alumina 80% alumina
designation
PN
PN
6425-2 thru -6 6425-7A, -7B, -8A
4-2121-2 4-2142-2
OC4-2332-1 OC4-2547-2
All tiles end use limit temperature is 3200°F.
Bulletin 6425 Page 3
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