ORIFICE PLATE INSTRUCTIONS
Primary air adjustment as shipped (Dim. "N", Bulletin 4762) will give best operation on most installations. In rare cases, adjustment may
be required to smooth out operation.
Common causes of rough operation are (1) leakagebetween the burner mounting fl ange and tube fl ange, and (2) careless trimming of
the mounting gasket ID so that it extends inside the burner opening.
Fig. 1.
4762-4 Burner, looking into main air inlet with orifi ce plate
positioned for no spin.
Fig. 2.
4762-6 Burner, looking into main air inlet with orifi ce
plate positioned for full spin.
All 4762 Burners are furnished with orifi ce plates in their main
air connections. These plates are factory-set in the positions
shown below to ensure smooth, trouble-free operation of the
burners. It should not be necessary to alter orifi ce plate positions
in the fi eld. Circular orifi ce plates with "D" shaped openings are
furnished with 4762-4 and -6 Burners.
Immersion
Tube
Immersion
Tube
Edge of plate
handle against
bolt
Edge of plate
handle against
bolt
Orifi ce plate
in no spin
position
Orifi ce plate
in full spin
position
Gas
inlet
Gas
inlet
Fig. 1.
4762-4
Fig. 2.
4762-6
4762-7-A, -7-B, AND -8 GAS BURNERS
Factory Setting
(See Bulletin 4762)
¾
" Pipe Tap
Connections
for
Pilot and
Flame Rod
Air
Adjustment
Hex Jam Nut
Main Air Inlet Flange
Air Inlet Gasket
Air Inlet Adapter Gasket
Orifi ce Plate
Body Air
Inlet Gasket
¼
" Pipe Plug
Main Air
Inlet Adapter
Obs. Port
(8790-0)
Gas Tube
Assembly
ASSEMBLE WITH TAPPED HOLES
IN DISC IN LINE WITH PILOT
HOLE IN BODY AS SHOWN
Air
Defl ector Plate
¾
" Pipe Plug
Hex Head
Bolt
Mounting
Gasket
Lockwasher
Body
†
Air Adjustment
OA4-0663-1
OA4-0663-1
OA4-0663-1
Air Defl ector Plate
OA4-1489-1
OA4-1489-1
OA4-1489-1
Air Inlet Adapter Gasket
OA4-0662-1
OA4-0662-1
OA4-0662-1
Air Inlet Gasket
4-5371-3
4-5371-3
4-5371-3
Body OC4-0658-1
OC4-0658-1
OC4-0658-1
Body Air Inlet Gasket
OA4-0660-1
OA4-0660-1
OA4-0660-1
Gas Tube Assembly
OA4-0781-1
OA4-0781-1
OA4-0781-1
Hex Head Bolt (2 req’d)
R066-2300-S
R066-2300-S
R066-2300-S
Hex Jam Nut
R510-2420-JC
R510-2420-JC
R510-2420-JC
Lockwasher (2 req’d)
R970-3220-S
R970-3220-S
R970-3220-S
Main Air Inlet Adapter
OC4-0659-1
OC4-0659-1
OC4-0659-1
Main Air Inlet Flange
4-1695-5
4-1695-5
8765-8 x 7-D
Mounting Gasket
OA4-2414-3
OA4-2414-3
OA4-2414-3
Orifi ce Plate
OA4-0674-1
OA4-0675-1
OA4-0676-1
Burner designation
Part Name
4762-7-A
4762-7-B 4762-8
†
Optional
†
Parts List
&
Instructions 4762-1
Page 2
