Vermont Casting ST967 Pilot Orifice Conversion, Pilot Type, Pilot type, 20012973, Natural Gas

5.Check that the screw is clean and if necessary re- move dirt.

6.Flip the screw. (Fig. 5)

7.Using the Allen wrench as shown in Figure 6, rotate the screw clockwise and tighten until snug.

Figure 5 Figure 6

� �

� �

� �

� �

WARNING: Do not overtighten the screw. Recommended to grip the wrench by the short side.

8.Verify that if the conversion is from NG to LP, the screw must be reassembled with the red o-ring vis- ible. (Fig. 7)

Figure 7		Natural Gas
LP Configuration
		Configuration
	�		�
	�		�
	�		�
	�		�
	Red O-ring Visible
	Red O-ring NOT Visible		CO141

9. Replace the black protection cap.

WARNING: Check that also the pilot and main burner injectors are appropriate for the gas type.

Pilot Orifice Conversion

1. Locate pilot. (Fig. 8)

ST935

Fig. 8 Locate pilot.

2.Replace pilot orifice.

Pilot Type 1

•Remove pilot hood by lifting up. (Fig. 9) Do not remove snap ring to remove pilot hood. NOTE: It is not necessary to remove the pilot tube for conver- sion.

•Remove pilot orifice with Allen wrench. (Fig. 10)

•Install the conversion orifice. Refer to Table 2.

•Reinstall pilot hood. Be sure to align hood with index tab.

Pilot Hood

Pilot

Bracket

CO105a

Fig. 9 Remove pilot hood.

Index Tab Allen Wrench

Snap Ring

CO106a

Fig. 10 Remove pilot orifice.

Pilot type 2

•Loosen pilot hood turning counterclockwise using a 7/16” wrench. (Fig. 11) NOTE: You may use pen- etrating oil to prevent pilot hood threads from seizing up.

Pilot Hood

Index

Marks

Pilot Bracket

CO143

Fig. 11 Remove pilot hood. (Your pilot may have a different appearance.)

2 20012973