Page 16
Identification
JB Manual
Figure B-12
JB1 & 2 Straight #2 Oil Drawer Assembly
with Direct Spark Ignition
Diffuser
Oil Nozzle(s)
Adapter
View Port
Oil Supply Line
Back Plate
Oil Ignition Electrodes
Diffuser Clamp
Oil Supply Line
Oil Nozzle(s)
Sight Tube
Gas Orifice Part Number and Description
Part No. Description Sketch
Example
Vessel
090002 Gas orifice, 5/16” brass blank, no holes
090002-076 Gas orifice, 5/16” brass, (2) radial #48 holes, no axial hole (48 x 2) B FB
090002-098 Gas orifice, 5/16” brass, (2) radial #40 holes, no axial hole (40 x 2) B FB
090054-xxx Gas orifice, 5/16” brass, no radial holes, (1) axial hole (xxx = hole dia.) E FB, SF
090055-xxx Gas orifice, 5/16” steel, no radial holes, (1) axial hole (xxx = hole dia.) E
090069-xxx Gas orifice, 5/16” brass, (4) #40 radial holes, (1) axial hole (xxx = hole dia.) (40 x 4 x __ ) A FB, SF
090184-xxx Gas orifice, 5/16” steel, (4) #40 radial holes, (1) axial hole (xxx = hole dia.) (40 x 4 x __ ) A
090185-000 Gas orifice, 5/16” steel blank, no radial or axial holes
090185-098 Gas orifice, 5/16” steel, (2) radial #40 holes, no axial hole (40 x 2) B
090227-xxx Gas orifice, 5/16” brass, (4) #48 radial holes, (1) axial hole (xxx = hole dia.) (48 x 4 x __ ) A
090284-xxx Gas orifice, 1/4” steel, no radial holes, (1) axial hole (xxx = hole dia.) E
090287 Orifice extention, 5/16” OD steel tube, 1.188” long D
090288 Orifice extention, 5/16” OD steel tube, 2.75” long D
090318 Orifice extention, 5/16” OD brass tube, 1.188” long D SF
090319 Orifice extention, 5/16” OD brass tube, 2.75” long D
OT (open tube) No orifice used (If no orifice part number given in BOM, asume OP)
Note: 1. Part numbers ending in “-xxx” use the drilled hole diameter as the last three digits, or
the “-xxx”. A number 40 drill would be “-098”.
2. Part numbers ending in “000” indicate no drilled hole.
3. Sketches show general appearance only, not number or type of holes.
4. Secondary orifices are closest to the burner center. primary orifices are on the outside.
FB = Firebox
SF = Scotch Firetube
If the radial drill size is a # 40 drill, this
would be called a “40 by 4” orifice,
which is common in the JB burner line.
If the radial drill size is a # 40 drill, this
would be called a “40 by 2” orifice,
which is common in the JB burner line.
2 Radial Holes
2 Radial Holes, No Axial Holes
Orifice Example “B”
The threads run the full length
of the orifice. This orifice cannot
have radial holes.
Orifice Example “E”
No Radial Holes, 1 Axial Hole
1 Axial Hole
4 Radial Holes
4 Radial Holes, Axial Hole -xxx
Orifice Example “A”
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