Williams 2903512, 2903511 Gas Conversions, Gas Type Nozzle Part Number, Nozzle Diameter

Gas Conversions

Converting to another gas type must be performed by a qualified service technician. If the type of the gas supplied to the dwelling is not the same type as your furnace (natural or LPG gas), it must be converted.

It will be necessary to do the following:

1.Change nozzle.

a.Remove the screw indicated to the right.

2. Without removing anything else, remove the nozzle from the burner inserting the screwdriver as indicated by the arrow.

Nozzle

3. Change the nozzle, attach the screw indicated at point 1 and set the burner pressure as indicated in the table below:

Gas Type	Nozzle Part Number
Natural Gas	JGLL069
LP Gas	JGLL062

Nozzle Diameter

0.1in. 0.06 in.

Gas Type	Minimum Inlet Line Gas	Maximum
	Pressure	Manifold Gas Pressure
Natural Gas	7.0-inches w.c.	3.2-inches w.c.
LP Gas	11.0-inches w.c.	10.6-inches w.c.

Minimum

Manifold Gas Pressure

1.8-inches w.c.

6.5-inches w.c.

4. Check the gas pressure and settings.

Minimum Burner Pressure Setting:

1.Set LOW burner capacity by pressing button Z2

2.Connect a micro manometer to the test gauge B (Figure 8)

3.Rotate the internal screw “D” (Figure 8) and set the pressure at the correct value

Maximum Burner Pressure Setting:

1.Set HI burner capacity by pressing button Z2

2.Connect a micro manometer to the test gauge B (Figure 8)

3.Rotate the external screw “C” (Figure 8) and set the pressure at the correct value

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