A.O. Smith BFM - 100, BFM - 120 manual Orifice replacement, Conversion to a different gas category

4

4.2Orifice replacement

1.strain relief

2.spark electrode lead

3.flame probe lead

4.burner control

5.gas control connector(s)

6.gas control

7.gas coupling

8.burner tray

Conversion to a different gas category

Gas control assembly removed

4

5

1

7

6

is

7

6

5

5

8

2

3

IMD-0254 R1

1.Remove the protective cover from the control column:

undo the 4 screws and remove the protective cover by lifting it. The electrical section will now be exposed.

2.Remove the strain relief (1) and disconnect the leads of the spark electrode (2 = red) and the flame probe (3 = black) from the burner control (4).

3.Unscrew the connector(s) (5) of the gas control (6).

4.Remove the gas coupling (7) of the gas control.

5.Remove the ten screws that fasten the burner tray (8).

6.Withdraw the burner tray from the appliance.

Note

When exchanging the pilot flame orifice and/or main orifices: Lay the burner tray on its side and approach it from the underside.

7.If the gas table (3.4.3 "Gas data") indicates that the pilot flame orifice needs to be replaced:

a.Remove the spark electrode (1) from its retaining clip. This way you will gain space to remove the pilot flame orifice.

b.Turn the flame probe (2) and remove it from its bracket to gain space.

c.Remove the bracket of the pilot flame orifice (3)

d.Replace the current pilot flame orifice (4) with a pilot flame orifice of the correct diameter from the conversion set.

e.Check the pilot flame orifice. The orifice diameter is stamped on the orifice itself.

f.Re-fit the bracket, the flame probe and the spark electrode.

40 Instruction manual BFM