Riello Burners RIELLO 40 F3, Installation & Operating Manual

C6501000  F3-F5 I-O manual Rev4_3 

7 

METHOD 1 – UNIVERSAL MOUNTING FLANGE 

 
A)  Insert the two BOLTS (1) into the UNIVERSAL MOUNTING FLANGE (10) from the flat side, ensuring 

the bolt heads are flush with the flat surface. Secure in place using two special CHROME NUTS (2) 
provided. 

 
B)  Position the MOUNTING GASKET (3) between the flat surface of the UNIVERSAL MOUNTING 

FLANGE (10) and the appliance. Line up the holes in the UNIVERSAL MOUNTING FLANGE with the 
STUDS (4) on the appliance mounting plate and securely bolt the UNIVERSAL MOUNTING FLANGE to 
the plate. 

C)  Secure the two semi-flanges of the ADJUSTABLE COLLAR (9) to the AIR TUBE using the two long 

BOLTS (6). Be sure that the ADJUSTABLE COLLAR (9) is properly positioned so the outside edge of the 
END CONE will be at least ¼ inch (6.5mm) back from the inside wall of the refractory of the combustion 
chamber (see dimension B above). The measured length (A) is to include MOUNTING GASKET and 
FLANGE, if used. 

D)  The burner may now be attached to the heating unit by insetting  the AIR TUBE through the BURNER 

ACCESS HOLE (8) and into the appliance, making sure the BOLTS (1) line up with the two HOLES (5) in 
the ADJUSTABLE COLLAR (9). Secure the burner in place using two NUTS (7). 

A visual verification of the air tube insertion into the combustion chamber of the heating unit is suggested. 
Dimension B should be at least ¼” (see drawing). 
 

NOTE:

 A suggested method for creating mounting bolt holes in the mounting gasket: Hold the gasket against 

the appliance mounting bolts using the mounting flange for proper positioning. Lightly tap the flange with a 
hammer to form the holes. 
 

METHOD 2 – SEMI-FLANGE COLLAR

A)  Follow item C from METHOD 1. 
B)  Align the air tube and attached adjustable collar so air tube is centered in the burner access hole of the 

boiler/furnace unit. Mark the center of the two holes in the ADJUSTABLE COLLAR on to the front plate of 
the heating unit. Then drill ¼ inch (6.5mm) holes through the front plate of the unit, using marks as a guide. 

C)  Install two short BOLTS (1) through the front plate of the heating unit from the inside, and secure on the 

outside using the two special CHROME NUTS (2). 

D)  Follow item D from METHOD 1.