Webster JB Series Installation, Startup, Operation And Maintenance Manual page 16

View Port
Oil Supply Line
Back Plate
Gas Orifice Part Number and Description
Part No.
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)
090002-098 Gas orifice, 5/16" brass, (2) radial #40 holes, no axial hole (40 x 2)
090054-xxx Gas orifice, 5/16" brass, no radial holes, (1) axial hole (xxx = hole dia.)
090055-xxx Gas orifice, 5/16" steel, no radial holes, (1) axial hole (xxx = hole dia.)
090069-xxx Gas orifice, 5/16" brass, (4) #40 radial holes, (1) axial hole (xxx = hole dia.) (40 x 4 x __ )
090184-xxx Gas orifice, 5/16" steel, (4) #40 radial holes, (1) axial hole (xxx = hole dia.) (40 x 4 x __ )
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)
090227-xxx Gas orifice, 5/16" brass, (4) #48 radial holes, (1) axial hole (xxx = hole dia.) (48 x 4 x __ )
090284-xxx Gas orifice, 1/4" steel, no radial holes, (1) axial hole (xxx = hole dia.)
090287 Orifice extention, 5/16" OD steel tube, 1.188" long
090288 Orifice extention, 5/16" OD steel tube, 2.75" long
090318 Orifice extention, 5/16" OD brass tube, 1.188" long
090319 Orifice extention, 5/16" OD brass tube, 2.75" long
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.
4 Radial Holes
Orifice Example "A"
4 Radial Holes, Axial Hole -xxx
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.
JB Manual
Oil Supply Line
Diffuser Clamp
Figure B-12
JB1 & 2 Straight #2 Oil Drawer Assembly
with Direct Spark Ignition
Description
2 Radial Holes
Orifice Example "B"
2 Radial Holes, No Axial Holes
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.
Page 16
Oil Ignition Electrodes
Sight Tube
No Radial Holes, 1 Axial Hole
The threads run the full length
of the orifice. This orifice cannot
have radial holes.
Diffuser
Oil Nozzle(s)
Oil Nozzle(s)
Adapter
Sketch Vessel
Example
B
B
E FB, SF
E
A FB, SF
A
B
A
E
D
D
D
D
FB = Firebox
SF = Scotch Firetube
1 Axial Hole
Orifice Example "E"
Identification
FB
FB
SF