Gas Conversions - Williams 2903512 Installation Instructions And Owner's Manual

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.
3. Change the nozzle, attach the screw indicated at point 1 and set the burner pressure as indicated in the table below:
Minimum Inlet Line Gas
Gas Type
Natural Gas
LP Gas
4. Check the gas pressure and settings.
Minimum Burner Pressure Setting
a. Set LOW burner capacity by pressing button Z2.
b. Connect a micro manometer to the test gauge B (Figure 8).
c. Rotate the internal screw "D" (Figure 8) and set the pressure at the correct value.
Maximum Burner Pressure Setting:
a. Set HI burner capacity by pressing button Z2
b. Connect a micro manometer to the test gauge B (Figure 8)
c. Rotate the external screw "C" (Figure 8) and set the pressure at the correct value
Gas Type Nozzle Part Number
Natural Gas
LP Gas
Pressure
7.0-inches w.c.
11.0-inches w.c.

Gas Conversions

Nozzle Diameter
P332553
P332549
Maximum
Manifold Gas Pressure
3.2-inches w.c.
10.6-inches w.c.
9
Nozzle
0.1 in.
0.06 in.
Minimum
Manifold Gas Pressure
1.8-inches w.c.
6.5-inches w.c.