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Vanguard VN20BT - User Manual

Vanguard VN20BT
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UNVENTED (VENT-FREE)
BLUE FLAME GAS HEATER
SAFETY INFORMATION AND
INSTALLATION MANUAL
For more information, visit www.desatech.com
For more information, visit www.desatech.com
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result caus-
ing property damage, personal injury, or loss of life.
— 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 try to 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 the gas supplier’s in-
structions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a
qualified installer, service agency, or the gas
supplier.
WARNING: Improper installation,
adjustment, alteration, service, or
maintenance can cause injury or
property damage. Refer to this
manual for correct installation and
operational procedures. For as-
sistance or additional information
consult a qualified installer, ser-
vice agency, or the gas supplier.
WARNING: This is an unvented
gas-fired heater. It uses air (oxy-
gen) from the room in which it is
installed. Provisions for ad-
equate combustion and ventila-
tion air must be provided. Refer
to
Air for Combustion and Venti-
lation
section on page 4 of this
manual.
This appliance may be installed in an aftermarket*, permanently located, manufactured
(mobile) home, where not prohibited by local codes.
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.
*Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
Save this manual for future reference.
Save this manual for future reference.
®
VN20BT
VP20BT
VN30BT
VP30BT

Table of Contents

Questions and Answers

  • J
    Jamie Fisher DDSAug 12, 2025
    How to fix no spark at ODS/pilot on Vanguard VN20BT Heater?
    • W
      Wesley SmithAug 12, 2025
      If the ignitor button is pressed, but there is no spark at the ODS/pilot of your Vanguard Heater, several issues could be the cause. The ignitor electrode might be positioned incorrectly or broken, in which case you should replace the pilot assembly. Alternatively, the ignitor electrode might not be connected to the ignitor cable; ensure you reconnect the ignitor cable. The ignitor cable could also be pinched or wet, so free it from any obstructions and keep it dry. If the ignitor cable is broken, replace it. Finally, a bad piezo ignitor can cause this issue, and it should be replaced.
  • R
    Ryan CortezAug 15, 2025
    What to do if Vanguard VN20BT Heater pilot light goes out when releasing control knob?
    • O
      oandradeAug 15, 2025
      If the ODS/pilot lights, but the flame goes out when you release the control knob on your Vanguard Heater, make sure the control knob is fully pressed in and held for at least 30 seconds after the pilot lights. The safety interlock system may have been triggered; wait one minute for it to reset, then repeat the ignition operation. Ensure the equipment shutoff valve is fully open. Check the thermocouple connection at the control valve and hand tighten it until it is snug, then tighten it an additional 1/4 turn. The pilot flame may not be touching the thermocouple, in that case you should clean or replace the ODS/pilot assembly. If the thermocouple or control valve is damaged, replace them.
  • L
    Larry AlexanderAug 19, 2025
    Why won't my Vanguard Heater ignite even with a spark?
    • M
      Maria RamirezAug 20, 2025
      If, when pressing the ignitor button, there is a spark at the ODS/pilot but no ignition on your Vanguard Heater, first ensure that the gas supply is turned on and the equipment shutoff valve is open. Verify that the control knob is in the PILOT position and pressed in. If there is air in the gas lines from a recent installation, continue holding down the control knob and repeat the ignition operation until the air is removed. For propane/LP gas models, check for a depleted gas supply and contact your local gas company if needed. The ODS/pilot may be clogged, so clean or replace the ODS/pilot assembly. Finally, the gas regulator setting may be incorrect, requiring you to replace the gas regulator.
  • L
    lopezanthonyAug 23, 2025
    What causes a Vanguard VN20BT Heater burner not to light after the pilot is lit?
    • H
      hsmithAug 23, 2025
      If the burner on your Vanguard Heater does not light after the ODS/pilot is lit, the burner orifice may be clogged. Clean the burner or replace the burner orifice. It's also possible that the inlet gas pressure is too low.
  • I
    ikingAug 27, 2025
    Why does my Vanguard VN20BT smell?
    • D
      David RobinsonAug 27, 2025
      If your Vanguard Heater produces unwanted odors, it might be burning vapors from paint, hair spray, glues, or other similar products. Ventilate the room and stop using these products while the heater is running. For propane/LP gas models, check for a low fuel supply and refill the tank if needed. A gas leak could also be the source of the odor; locate and correct any leaks.
  • J
    Joseph RodriguezAug 31, 2025
    How to stop Vanguard VN20BT burner from backfiring?
    • D
      Denise CopelandAug 31, 2025
      If the burner is backfiring during combustion in your Vanguard Heater, the burner orifice may be clogged or damaged; clean or replace it. The burner itself may be damaged, requiring replacement. A defective gas regulator can also cause backfiring, so replace it if necessary.
  • J
    Julia ThompsonSep 3, 2025
    Why is there a delay when my Vanguard VN20BT burner ignites?
    • D
      duncanheidiSep 3, 2025
      Delayed ignition of the burner in your Vanguard Heater can be caused by low manifold pressure. Another potential cause is a clogged burner orifice; clean or replace it.
  • P
    Pamela LopezSep 7, 2025
    Why is the flame yellow on my Vanguard VN20BT Heater?
    • M
      Michael RandallSep 7, 2025
      If you notice a yellow flame during burner combustion in your Vanguard Heater, it indicates that there is not enough air. Check the burner for dirt and debris and clean it if necessary.

Vanguard VN20BT Specifications

General IconGeneral
BrandVanguard
ModelVN20BT
CategoryHeater
LanguageEnglish