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Williams 3509821 - User Manual

Williams 3509821
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Owner’s Manual Save this manual for future reference.
Williams Furnace Co. 250 West Laurel Street Colton, California 92324 U.S.A.
Top-Vent Gravity Wall
Furnace
Model Numbers:
2509822; 2519822; 2539822; 2559822; 3509822; 3519822:
3539822; 3559822; 5009822; 5019822; 5039822; 5059822
FOR USE WITH NATURAL GAS ONLY
Model Numbers:
2509821; 2519821; 2539821; 2559821; 3509821; 3519821;
3539821; 3559821; 5009821; 5019821; 5039821; 5059821
FOR USE WITH PROPANE GAS ONLY
READ THIS OWNER’S MANUAL CAREFULLY BEFORE YOU
INSTALL YOUR NEW WILLIAMS WALL FURNACE.
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause injury
or property damage. Refer to this manual. For
assistance or for additional information consult a
qualified installer, service agency or the gas
supplier.
50,000
Btu/hr. Model
25,000 and 35,000
Btu/hr. Model
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
Open all windows.
Do not try to light any appliance.
Do not touch any electrical switch; do not
use any phone or cell phone in your
building.
Extinguish any open flame.
Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
If you cannot reach the gas supplier,
call the fire department.
Installation and service must be performed
by a qualified installer, service agency or
the gas supplier.
WARNING: If the information in these
instructions is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or loss of life.

Table of Contents

Questions and Answers

  • M
    Michael WolfeSep 15, 2025
    What to do if there is no gas going to the main burner in my Williams Wall Furnace?
    • J
      James MartinSep 15, 2025
      If there's no gas going to the main burner in your Williams Wall Furnace, ensure the gas valve knob is turned to the 'ON' position and the thermostat is set to call for heat. Check, clean, or replace components as needed. Also, check the connections at the valve terminals, and if the valve operates, check the thermostat wires. Refer to sections 1a and 1c for additional guidance. If these steps don't work, the gas valve may need to be replaced. Finally, check and reset the system.
  • W
    warrensarahSep 17, 2025
    Why is my Williams Wall Furnace making a noisy blower sound?
    • P
      Peggy LeeSep 18, 2025
      A noisy blower in your Williams Wall Furnace can often be resolved by tightening the blower screws. Additionally, cleaning the blower wheel might help. If the noise persists, the blower wheel may need to be straightened or replaced.
  • T
    tcastilloNov 20, 2025
    Why Williams Furnace pilot will not stay lit?
    • H
      hbrownNov 20, 2025
      The pilot light on your Williams Furnace might not stay lit due to several reasons: * The generator may not be producing enough millivolts. Ensure the pilot flame is directly hitting the generator. * The generator connections at the gas valve might be loose or dirty. Try cleaning and tightening these connections. * The generator itself could be defective. Use a millivolt meter to check the reading at the generator terminals with the valve in the 'Pilot' position. Disconnect the thermostat wires first. A reading of 450 millivolts or higher is needed. * A grounded thermostat wire could be the issue. Disconnect the thermostat wires from the valve terminals. If the pilot stays lit, trace the thermostat wiring for any grounds, such as contact with the furnace, gas supply, nails, or sta...
  • B
    bowerscoreyNov 21, 2025
    What to do if Williams 3509821 has no gas to the main burner?
    • V
      vshawNov 22, 2025
      If there's no gas reaching the main burner of your Williams Furnace, consider the following: * Ensure the gas valve is turned to the 'ON' position after lighting the pilot. * Verify that the thermostat is set to a temperature that calls for heat. * The furnace orifice might be plugged. Inspect, clean, or replace it if necessary. * Check the thermostat wires for proper connections at the valve terminals. If the valve operates, inspect the thermostat wires themselves. A defective thermostat can also cause this issue. * The pilot generator might not be generating enough millivolts to open the valve. Refer to solutions 1a and 1c for troubleshooting the pilot. * The gas valve could be defective. Replace it after verifying the above steps. * The vent safety switch may have tripped...
  • B
    bdavisDec 1, 2025
    Why Williams 3509821 Furnace main burner will not stay on?
    • A
      Alexandria HoDec 1, 2025
      If the main burner on your Williams Furnace won't stay on, consider the following: * Check the vent pipe for any blockages like bird nests, twigs, or leaves. Also, ensure the vent cap is correctly installed and not placed too far down on the vent pipe. The cap should be from the same manufacturer as the vent. * The vent might be too short. It should extend at least 12 feet above the floor plate, with the top being at least 2 feet above any obstacle within a 10-foot radius, including the roof. * Restrictions in the vent system caused by offsets can be a problem. Type “B” vents should extend vertically with offsets not exceeding 45 degrees. Any angle greater than 45 degrees is considered horizontal. Offsets should be at least 2 feet above the draft hood or as far away as possible. Too...

Williams 3509821 Specifications

General IconGeneral
Model Number3509821
BrandWilliams
Input BTU100, 000
Output BTU80, 000
Fuel TypeNatural Gas
Efficiency80%

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