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Lennox Shadowdance LSVFSD-18 - User Manual

Lennox Shadowdance LSVFSD-18
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Report No.116-L-49-5
INSTALLATION AND OPERATION INSTRUCTIONS
Vent-Free Millivolt
Dual-Listed Gas Log Sets
Shadowdance™ Series
P/N 850051M Rev. C, 03/2011
In the Commonwealth of Massachusetts:
• Installation must be performed by a licensed plumber or gas tter
• See Table of Contents for location of additional
Commonwealth of Massachusetts requirements
Gas Train Models:
LSVFSD-NG
LSVFSD-LP
Log Sets Sold Separately
Log Set Models:
LSVFSD-18 Logs
LSVFSD-24 Logs
LSVFSD-30 Logs
WARNINGS
• Hot! Do not touch! This appliance will be hot during operation and will retain heat for a while after
shutting off the appliance. Severe burns may result.
• Carefully supervise children in the same room as appliance.
• Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or additional information consult a qualified installer,
service agency or the gas supplier.
• Do not build a wood fire. Do not burn wood or other material in these appliances.
• Carefully review the instructions supplied with the decorative type unvented room heater for the minimum fire-
place size requirement. Do not install the appliance in the fireplace, unless the fireplace meets the minimum
dimensions required for the installations (see Page 3).
•
This is an unvented gas log appliance. It uses air (oxygen) from the room in which it is installed. Provisions for adequate
combustion and ventilation air must be provided. Refer to Combustion and Ventilation Air Section on Page 5.
• Important: Read and understand these instructions completely before installing your unvented room heaters.
• This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible
for use with other gases. If the gas supply differs, DO NOT INSTALL the appliance. Contact your dealer to obtain
the correct appliance.
• This appliance may be installed in an aftermarket, permanently located, manufactured (mobile) home, where
not prohibited by local codes.
• Lennox
®
vent-free gas logs are designed for use as a supplemental heater. They are not intended for continuous use
as a primary heat source.
TM
Installer: Leave This Manual With The Appliance.
Consumer: Retain This Manual For Future Reference.
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:
• Do not light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow your gas supplier's instructions.
• If your gas supplier cannot be reached, 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 this manual is not followed exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
US
Portland

Table of Contents

Questions and Answers

  • M
    mendezsamanthaAug 17, 2025
    Why won't my Lennox Shadowdance LSVFSD-18 Gas Heater ignite even though there's a spark?
    • N
      nicholasmorrisAug 17, 2025
      If, when you press the igniter button on your Lennox Gas Heater, there is a spark at the ODS/pilot, but no ignition occurs, make sure the gas supply is turned on and the manual shut-off valve is open. Ensure the control knob is in the “PILOT” position and pressed in while in that position. If there is air in the gas lines from a recent installation, continue holding down the control knob and repeat the igniting operation until the air is removed. The ODS/pilot may be clogged and require replacement or servicing. If the gas regulator setting is incorrect, the gas regulator should be replaced.
  • M
    Matthew JohnsonAug 20, 2025
    Why won't the burner light on my Lennox Shadowdance LSVFSD-18 Gas Heater after the pilot is lit?
    • K
      kyle12Aug 20, 2025
      If the burner on your Lennox Gas Heater does not light after the ODS/pilot is lit, it could be due to a clogged burner orifice. Try cleaning the burner or replacing the burner orifice. It's also possible that the burner orifice diameter is too small, requiring replacement. Finally, low inlet gas pressure could be the issue; in this case, contact your local gas company.
  • V
    Valerie MuellerAug 22, 2025
    How to fix no spark at the pilot light on my Lennox Shadowdance LSVFSD-18 Gas Heater?
    • K
      kennedytroyAug 22, 2025
      If the igniter button is pressed on your Lennox Gas Heater and there is no spark at the ODS/pilot, the igniter electrode may be positioned incorrectly or broken, in which case you should replace the igniter. The igniter electrode might not be connected to the igniter cable; reconnect it. The igniter cable could be pinched or wet; free it if pinched and keep it dry. The piezo igniter nut may be loose; tighten it. The igniter cable or the piezo igniter itself could be broken, requiring replacement.
  • B
    Brandon CuevasAug 25, 2025
    Why does my Lennox Shadowdance LSVFSD-18 Gas Heater smell like gas even when it's off?
    • B
      brendaelliottAug 26, 2025
      If your Lennox Gas Heater emits a gas odor even when the control knob is in the “OFF” position, it could be due to a gas leak or a defective control valve. You should locate and correct all leaks, or replace the control valve.
  • J
    Jessica WolfAug 28, 2025
    What to do if my Lennox Shadowdance LSVFSD-18 keeps shutting off?
    • J
      Jennifer SchneiderAug 28, 2025
      If your Lennox Gas Heater shuts off during use, and the ODS (Oxygen Depletion Sensor) is operating, it might be due to several reasons. There might not be enough fresh air available, so open a window or door for ventilation. Alternatively, there could be low line pressure, in which case you should contact your local gas company. Finally, the ODS/pilot might be partially clogged, so try cleaning it.
  • W
    wramirezAug 31, 2025
    Why does the flame go out when I release the control knob on my Lennox Shadowdance LSVFSD-18 Gas Heater?
    • C
      Carolyn CarpenterAug 31, 2025
      If the ODS/pilot lights, but the flame goes out when you release the control knob on your Lennox Gas Heater, ensure the control knob is fully pressed in and held for at least 30 seconds after the pilot lights. Also, make sure the manual shut-off valve is fully open. Check if the thermocouple connection is loose at the control valve and hand tighten it until snug, then tighten a quarter turn more. The pilot flame might not be touching the thermocouple due to low gas pressure (contact your local gas company) or a dirty/clogged ODS/pilot (replace or service the ODS/pilot assembly). If none of these steps work, the thermocouple or control valve may be damaged and need replacement.
  • J
    Johnny GarciaSep 2, 2025
    Why does my Lennox Shadowdance LSVFSD-18 smell bad?
    • A
      alvaradoashleySep 2, 2025
      If your Lennox Gas Heater is producing unwanted odors, it could be due to the heater burning vapors from paint, hair spray, glues, or other similar products. Ventilate the room and stop using these odor-causing products while the heater is running. Alternatively, there could be a gas leak, which needs to be located and corrected.
  • T
    Timothy RodriguezSep 5, 2025
    Why is there a delay when my Lennox Shadowdance LSVFSD-18 burner ignites?
    • S
      shawn23Sep 5, 2025
      If your Lennox Gas Heater experiences delayed ignition of the burner, it could be due to low manifold pressure. Contact your local gas company to check this. Another possible cause is a clogged burner orifice, which you should clean or replace.
  • J
    Justin MillerSep 8, 2025
    Why is my Lennox Shadowdance LSVFSD-18 burner backfiring?
    • J
      Jacob SolomonSep 8, 2025
      If your Lennox Gas Heater burner is backfiring during combustion, the burner orifice may be clogged or damaged; clean or replace it. The burner itself might also be damaged, requiring replacement. A defective gas regulator can also cause backfiring, so consider replacing it.
  • P
    prodriguezSep 12, 2025
    Why does my Lennox Shadowdance LSVFSD-18 make a whistling noise?
    • J
      james55Sep 12, 2025
      If your Lennox Gas Heater produces a whistling noise when the burner is lit, try turning the control knob to the “LO” position and letting it warm up for a minute, especially if the burner is cold. The noise could also be due to air in the gas line; operate the burner until the air is removed, and have the gas line checked by your local gas company. A dirty or partially clogged burner orifice can also cause this issue, so clean or replace the burner orifice.

Lennox Shadowdance LSVFSD-18 Specifications

General IconGeneral
Fuel TypeNatural Gas or Propane
VentingDirect Vent
BTU Input18, 000 BTU/hr
DimensionsVaries by model
WeightVaries by model

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