Product Overview | 6421 Take-Apart Burner
Removable Stationary
Bulletin 6421 Page 3
DIMENSIONS inches
K
J°
J°
Atom. air conn. C –NPT
B-B
B-B
A-A
Oil conn. 3⁄8 NPT
Main air conn. A –NPT
L
B-B
B-B
F
A-A
G
S dia.
D
T sq.
G
F
‡
M
†
Built-in limiting orifice gas valve
Gas conn. B –NPT
¾ G G
½
H
F
F
E
N
D
P
6421-4 thru 6421-6
† ¼ NPT Pressure tap ‡ 1⁄8 NPT Pressure tap
W
Q
R
Clearance required to remove internals
"Flower pot" type air connection flange for the -8-A size only.
Obs. port or Pilot ¾ NPT
UV conn. ¾ NPT
42 °
45 °
V
U
6421-7-A thru -8-A
SECTION A–A
SECTION B–B
Burner
Dimensions in inches
designation
A
B
C
D
E
F
G
H
J
K
L
M
N
6421-4 6421-5 6421-6
2
1 ¼ 1 ½ 1 ½ 2 ½ 2 ½ 2 ½
14 14 14 16 16 16
7 7 7 8 8 8
6 ¼ 6 ¼ 6 ¼ 7 3⁄8 7 3⁄8 7 3⁄8
3 1⁄8 3 1⁄8 3 1⁄8
5 7⁄8 5 7⁄8 5 7⁄8 7 ¼ 7 ¼ 7 ¼
67 ½ 67 ½ 67 ½ 58 ½ 58 ½ 58 ½
8 3⁄8 8 3⁄8 8 3⁄8 9 7⁄8 9 7⁄8 9 7⁄8
5 ¼ 5 ¼ 5 ¼ 6 7⁄8 6 7⁄8 6 7⁄8
6 1⁄16 6 1⁄16 6 1⁄16 7 15⁄16 7 15⁄16 7 15⁄16
6 3⁄16 6 3⁄16 6 3⁄16 7 9⁄16 7 9⁄16 7 9⁄16
¾
2 ½
1 1
3 4 4 6
6421-7-A 6421-7-B 6421-8-A
1 ¼ 1 ¼ 1 ¼
3 11⁄16 3 11⁄16 3 11⁄16
Recommended
Approx. Flame Lengths with 14 osi Main Air
Burner
Dimensions in inches
Approx
Sensitrol™ Oil Valve * 1813-02-A 1813-02-A 1813-02-B 1813-02-C 1813-02-C 1813-02-D
designation
P
Q
R S
T
U
V
W
wt, lb
(in open furnace)
6421-4 6421-5 6421-6
8 1⁄8 8 1⁄8 8 1⁄8
16 5⁄8 16 5⁄8 16 5⁄8
31 31 31
5 5 5
10 10 10 12 12 12
1 29⁄32 1 29⁄32 1 29⁄32 1 13⁄16 1 13⁄16 1 13⁄16
2 13⁄32 2 13⁄32 2 13⁄32
7 7 7 7 7 7
80 80 80
3 ½ ' 4 ½ ' 4 ½ '
6421-7-A 6421-7-B 6421-8-A
9 3⁄16 9 3⁄16 9 3⁄16
20 1⁄16 20 1⁄16 20 1⁄16
33 7 33 7 33 7
2 5⁄8 2 5⁄8 2 5⁄8
140 140 150
5' 5' 7'
* Sensitrol Oil Valve is not included as part of the burner assembly and must be ordered separately.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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