Instructions / Assembly

Instructions For Williams Gas Appliance
Conversion Kit No. 7685, 7687, 7688, 7690 & 7691
Natural Gas To Liquid Propane Gas
KIT CONTENTS:
(1) Cap Screw (1 OR 2) Burner Orifice (L.P. Gas)
(1) Pressure Regulator Adjustment Screw (3) Conversion Labels
(1) Spring (Red) (1) L.P.G Tag
(1 OR 2) Pilot Orifices (L.P. Gas) (1) “O” Ring
WARNING: This conversion kit shall be installed by a qualified service agency in accordance with the manufacturer’s
instructions and all applicable codes and requirements of the authority having jurisdiction. If the information in these
instructions is not followed exactly, a fire, explosion or production of carbon monoxide may result, causing property
damage, personal injury or loss of life. The qualified service agency is responsible for the proper installation of this kit.
The installation is not proper and complete until the operation of the converted appliance is checked as specified in the
manufacturer’s instructions supplied with the kit.
These conversion kits are to be used on 4007332; 4007732; 5507332; 6257732 the Forsaire Direct Vent wall furnaces
when equipped with natural gas valves: P322042 (Standing Pilot) and P322044 (Electronic Ignition) 4007331; 4007731;
5507331; 6257731 with 50mm stainless steel burner 12B56 converting to Natural Gas.
when equipped with natural gas valves: P323309 (Standing Pilot Models) and P323210 (Electronic Ignition Models), with
50mm stainless steel burner 12B56 converting to L.P. Gas.
CAUTION: The gas supply must be shutoff prior to disconnecting the electrical power (if equipped with a blower) before
proceeding with the conversion.
CONVERSION INSTRUCTIONS –NATURAL GAS TO LIQUID PROPANE GAS
1. Shut ff gas to the furnace.
2. Shut off electric power to the furnace.
3. Disconnect gas supply line from control valve.
4. Remove electronic ignition module (if equipped).
CAUTON: Label all wires prior to disconnection for proper reconnection.
5. Remove screws to release burner pan.
6. Separate burner pan and gasket from upper combustion chamber.
7. NOTE: Gasket (P101600) between upper combustion chamber support and burner pan may need to be
replaced.
8. Pull burner pan forward as far as possible.
9. Front edge of upper combustion chamber base and face area of burner must come together to create a pivot point.
10. Keeping two points together, rotate burner pan upward a remove. Once removed, all work can be performed on
work bench.
11. Use a 7/16” open end wrench and remove the burner orifice(s) from the manifold and replace with the orifice(s)
provided in this kit. Refer to Figures 1.
12. Remove pilot orifice from pilot and replace with orifice provided in this kit. Refer to Figure 2.
13. Remove regulator cap screw and pressure regulator adjusting screws. See Figure 3.
14. Remove the existing spring.
15. Insert the replacement red spring.
16. Install the new plastic pressure regulator adjustment screw. Assure that the screw top is flush with the regulators
top.
17. Turn pressure regulator adjustment screw clockwise eleven complete turns. The preliminary pressure setting is
approximately 10.5” w.c. for LP gas regulator and 4.0 w.c. for natural gas regulator.
18. Check the regulator setting using a manometer or by clocking the gas meter.
19. Install the new cap screw and O ring.
17. Reassemble the furnace by following the steps above in reverse order. During reassembly of burner pan, be sure
pins on the rear of the burner pan are inserted into combustion chamber rear support.