Flame supervision
detector location
¾
" pipe plugs (2)
Observation port
or Pilot
Tile retaining
rods
6421-4, -5, -6
Swing bolt
with knob (4)
Main air fl ange gasket
Main
air fl ange
6421-7-A,
-7-B, -8-A
Tile retaining
rods
Observation port
or Pilot
Flame supervision
detector location
¾
" pipe plugs (2)
Main air fl ange
Main air fl ange gasket
Cap screws (6)
Burner designation
Part name
6421-4
6421-5
6421-6
6421-7-A
6421-7-B
6421-8-A
Backplate
3-4765-3 3-4765-3 3-4765-3 3-4826-2 3-4826-2 3-4826-2
Backplate
Fastener
–
–
–
4-13701-1
4-13701-1
4-13701-1
Backplate Fastener Adapter
–
–
–
4-13698-1
4-13698-1
4-13698-1
Body
3-4764-5 3-4764-6 3-4764-6 3-4822-1 3-4822-1 3-4822-1
Knob (4 reqd.)
3-6827-1
3-6827-1
3-6827-1
–
–
–
Main Air Flange
4-1695-2
4-1695-3
4-1695-9
8765 -7-D 8765-7-D 8765-8
7-D
Main Air Flange Gasket
4-5371-2
4-5371-2
4-5371-2
4-5371-3
4-5371-3
4-5371-3
Observation
Port
8790-0 8790-0 8790-0 8790-0 8790-0 8790-0
Swing Bolt (4 reqd.)
3-6492-2
3-6492-2
3-6492-2
–
–
–
Tile Retaining Rods
3-1115-2
3-1115-2
3-1115-2
3-1115-2
3-1115-2
3-1115-2
(4 reqd.)
Backplate fastener
Backplate fastener adapter
Body
Backplate
Section A-A
A
A
Parts List 6421-2
Page 2
Observation port
or Pilot
Observation port
or Pilot
Cop
yr
igh
t © 2020 - F
iv
es - All r
igh
ts r
eser
ved | 6421-2_pl 08/07
WARNING:
Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot
surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot
surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
Fives North American Combustion, Inc.
4455 East 71st Street - Cleveland, OH 44105 - USA
www.fi vesgroup.com
CONTACT
fna.sales@fi vesgroup.com
T +1 800 626 3477 - F +1 216 373 4237
