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

Catalog Combustion 2021 - Page 0456

Fives Group
FIVES GROUP
FIVES GROUP-FIVES GROUP-0456-0460

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Fives Group Part Numbers on this Catalog Page
Line Part Number Manufacturer Request Quote
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3 4-1489-1 Fives Group Request Quote
4 970-3220 Fives Group Request Quote
5 4-2414-3 Fives Group Request Quote
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7 4-0659-1 Fives Group Request Quote
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10 4-1695-5 Fives Group Request Quote
11 4-0660-1 Fives Group Request Quote
12 4-0662-1 Fives Group Request Quote
13 4-5371-3 Fives Group Request Quote
14 066-2300 Fives Group Request Quote
15 4-0676-1 Fives Group Request Quote
16 4-0658-1 Fives Group Request Quote