North American Observation Ports
Bulletin 8790
max.
spare
spare
Port
max.
temp. pipe
max.
protruding
length
overall wt,
gasket
lens
designation
psi
F
size dia. when mounted length lb
material
part no.
part no.
8790-02
10
500
3⁄8
7⁄8
3⁄8
¾
¼
plated steel
(Fused Unit)
†
8790-01
10
500
½
11⁄16
5⁄16
13⁄16
¼
plated steel
(Fused Unit)
†
8790-0
10
500
¾
1¼
5⁄8
1
1
/
8
¼
brass
(Fused
Unit)†
8790-4-A
5 800
2 3¾
15⁄16 21⁄16
1½
cast
iron
4-3903-1
R530-2069
8790-4-AB
5 800
2 3¾
15⁄16 21⁄16
1½
cast
iron
4-3903-1
R530-2068
8790-4-AC
5 1300
2 3¾
15⁄16 21⁄16
1½
cast
iron
4-3903-1
R530-2071
dimensions in inches
8790-0
8790 Observation Ports
allow visual checking of fl ames. Ports
All have standard male pipe threads and clear glass lenses. The
2" size is available with blue Pyrex glass (for luminous fl ames
or high temperature furnaces) by specifying 8790-4-AB. A high
temperature quartz lens with a heat refl ective coating is also
available in the 2" size by specifying 8790-4-AC.
8790-01
8790-4-A
8790-4-AB
8790-4-AC
It may be benefi cial in some higher temperature applications
to install the 8790-0
¾
" observation port with a cooling air or
purge air adapter assembly.
The 8834-R Adapter unit provides a means of installing cooling
air or purge air between an 8790-0 Observation Port and the
¾
" NPT mounting provision of most North American burners.
See page 4 of Bulletin 8832 for Series R Adapter installation
instructions.
8834-R Adapter Assembly
4
½
" long
1
7⁄8
" maximum OD
¼
" Tube Cooling Air Connection
(1
¾
" above centerline)
¾
" NPT
Gaskets
Sealing
Window
Setscrew
8790-0
(ordered separately)
¾
" SST
coupling
8790-02
Cop
yr
igh
t © 2020 - F
iv
es - All r
igh
ts r
eser
ved | Bulle
tin 8790 09/10
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
.
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.
†
Spare parts are still available for old removable lens R530-2026 R530-2025
ENERG
Y | C
OMBUSITION
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
