Products Only For Professionals

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Products Only For Professionals
The strength to stand alone The insight to
show the way
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Industry News
The Introduction of Flammable Vapor Ignition
Resistant (FVIR) Gas Water Heaters
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The Bradford White
TM
Safety System
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Flammable Vapor Ignition Resistant Residential
Gas Products

• July 1, 2003 Conventional 30,40,50 gallon models
• July 1, 2004Power Vent 30,40,50 gallon models
• July 1, 2005All other gas products 75,000 BTUs
  and less

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Who is the CPSC ?

• Independent Federal Regulatory Agency
• Directed by three commissioners appointed by the
  President and confirmed by the Senate
• The President designates one of the commissioners
  as Chairman
• Created in 1972 under the Consumer Product Safety
  Act, To protect the public against unreasonable
  risks of injuries associated with consumer
  products.
• Information obtained from the CPSC web site
  www.cpsc.gov

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A Look Back...

• 1994 - Water Heater Joint Research and
  Development Consortium was formed and begins work
  with the CPSC on a technical solution to
  flammable vapor ignition
• Source CPSC website www.cpsc.gov

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Who Oversees the Project?

• The Gas Research Institute
• Technical Advisory Group
• Representatives of the Gas Industry
• Manufacturers
• Industry trade associations
• CPSC staff
• Information obtained from the CPSC web site
  www.cpsc.gov

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Is This Change a Federal Requirement?

• No
• The industry volunteered to develop a solution
  (and independently fund)
• The CPSC agreed to postpone the regulatory
  process
• Information obtained from the CPSC web site
  www.cpsc.gov

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Flame Arrestor
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The geometry of the louvers increase the velocity
of incoming air into the combustion chamber.
Arrestor
The combination of high velocity air entering the
chamber and the effect caused by combustion
prevents any flames from traveling backwards and
outside of the water heater.
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ANSI Standard

• Design Criteria
• Gasoline Spill Test

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Resistance to Lint, Dust and Oil Accumulation

• The outlined requirement would be considered met
  when
• The carbon monoxide concentration reaches
  equilibrium
• The water heater shuts down, and requires a
  manual restart to resume operation.
• Information obtained from the Addenda to the
  Second Edition of ANSIZ21.10.1-2001 CSA
  4.1-2001 American National Standard/CSA Standard
  for Gas Water Heaters Volume I, Storage Water
  Heaters with Input Ratings of 75,000 BTU per Hour
  or Less.

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Ignition of Flammable Vapors and Gas Water
Heaters Standard Change

• ANSI Z21.10.1 will be amended to include testing
  for flammable vapor ignition resistance and the
  accumulation for Lint, Dust and Oil.

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ANSI Standard

• Design Criteria
• Gasoline Spill Test
• Lint, Dust and Oil

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How The Safety System Works

• Should any flammable vapors be present in the
  chamber, the flame arrestor plate prevents the
  flames from traveling backwards and igniting
  vapors outside of the combustion chamber
• The calibrated, multipurpose re-settable thermal
  switch quickly recognizes this and shuts down the
  pilot and main burner.
• The switch also deactivates the burner and pilot
  in the unlikely event of restricted airflow
  caused by severe lint, dust or oil accumulation
  on the arrestor plate.

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Scrubbing the Air
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Scrubbing the Air
During normal operation, combustion air is drawn
into the water heater through openings in the
jacket.
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Scrubbing the Air
The combustion air enters through holes in the
very bottom of the chamber.
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Scrubbing the Air

• One of the key reasons for minimal, if any,
  routine maintenance on the arrestor is because of
  the many air movement changes through the
  combustion chamber.

• The Defender Safety Systems unique design causes
  several directional changes to the flow of
  combustion air.
• This series of diversions is the key to
  scrubbing the air of the majority of lint and
  dust and providing years of trouble-free service.

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Maintenance FREE!

• No Regular cleaning of air inlet openings
• or flame arrestor is required.

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Cleaning the Arrestor

• Arrestor can be cleaned with
• Compressed Air and/or
• Shop Vacuum

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Cleaning the Arrestor

• Even though no regular cleaning is required, the
  ScreenLokTM Flame Arrestor can be cleaned by
  removing the chamber door and blowing air through
  the jacket openings and/or vacuuming clean with a
  shop vacuum.

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Keys to Safe Operation

• Seal Integrity
• There are several screws on the inner combustion
  chamber door. When working on the heater, it is
  important the gasket be intact when reinstalling
  the door and all screws are re-installed.
• If the gasket is damaged, you must replace it
  with a new one.

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Design Features
Draft diverter
Hydrojet diptube
Hot water outlet
Temperature and Pressure relief valve
Thermostat and gas valve
Drain valve
Combustion air entry holes
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Design Features

• Advanced ScreenLokTM Technology Flame Arrestor
  Design
• Constructed of 304L stainless steel for
  outstanding impact, heat, crack and corrosion
  resistance.

Combustion air entry holes
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Design Features

• Re-settable Thermal Switch
• Proven, reliable, bi-metallic switch will
  interrupt gas supply to the pilot and main burner.

Sealed inner door
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Design Features

• Pedestal Base

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Design Features

• Pedestal Base
• Rugged and durable base allows easy transport and
  positioning. Resists corrosion in harsh
  environments.

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Design Features

• Piezo Igniter
• Easy and quick lighting of the pilot burner by
  push button.

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Design Features

• Site Window
• Offers a view into the combustion chamber to view
  pilot and burner operation.

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Design Features

• Standard Thermocouple
• Conventional off-the shelf replacement parts for
  quick service.
• Controlled Combustion System
• Added strength with lower noise. Assures
  combustion air is directed through the
  ScreenLokTM Technology flame arrestor.

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Design Features

• Proven Burner Design
• Used for many years to allow off-the-shelf
  replacement if necessary.
• Low NOx Standard
• Efficient and clean combustion on all models and
  sizes.
• Meets or exceeds all air quality emission
  regulations.

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No Stand Required

• The National Fuel Gas Code will no longer require
  a water heater stand when a FVIR Heater is
  installed in a garage.
• Local Codes may still require a stand

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No Added Height!

• Same compact and efficient dimensions

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Clearance to Combustibles

• Still - Zero Inches
• on Sides and Rear

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Components Not Affected

• Thermocouple
• Burner
• Gas Valve/Thermostat

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The DefenderTM Safety System
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Troubleshooting
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Robertshaw Residential T-Stat (Approximate
Settings)

• Warm 120?F
• Hot 160?F
• Each Notch is in 10F Increments
• Temp Tolerance 5-10?F
• Differential 18?F

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Time Temperature it Takes to SCALD

• 125F 1 ½ to 2 minutes
• 130F-135 F 30 to 10 seconds
• 140 F- 145F Less than 5 to 3 seconds
• 150 F- 155F 1 ½ to 1 second
• 160 F Less than 1 Second

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Residential Control Valve

• Pressure Regulation Built-in regulator accepts
  up to a maximum of 14 w.c. (1/2 PSI) of line
  pressure for both Natural and LP Gas and
  regulates down to proper manifold pressure
  (usually 4.0 w.c. for Natural and 10.0 w.c. for
  LP Gas)

Remember! The minimum supply pressure should
be at least 1.0 w.c. above the manifold
pressure.
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Magnet/Thermocouple

• A device incorporated with Gas Valve designed to
  operate in conjunction with thermocouple.
• Thermocouple generates a current that energizes
  the magnet, holding the spring-loaded plunger
  open, to allow gas to pass through to pilot and
  main valve.
• The magnet requires at least 7 millivolts to
  energize and will generally drop out at 2
  millivolts.
• Thermocouple will generate 7-15 millivolts in
  closed circuit and 20-30 in an open circuit

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Magnet Drop-out Test

• Power up Magnet with a good thermocouple. Once
  pilot has been operating for at least 3 minutes,
  turn off the gas valve.
• With the gas valve turned off, monitor the time
  it takes until the magnetic plunger assembly
  opens (you will hear a pop sound).
• The time should be 45 seconds or more. If less
  than 30 seconds, replace gas valve.

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Combustion Air Supply

• The flow of combustion air must not be obstructed
• Providing adequate air for combustion and
  ventilation is very important.
• Insufficient combustion air will cause
  re-circulation of combustion products resulting
  in contamination that may be hazardous to life.

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Commonly Asked Troubleshooting Questions
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Condensation
Definition The change of water from a vapor to a
liquid state.

• When the products of combustion, which are in a
  vapor state (CO, CO2, NOx, H2O) reach a
  temperature less than the dew point, the vapor
  changes to a liquid.
• Initial start up of a water heater (Hot flue
  gases cool tank)
• High Efficiency Water Heaters (85 and greater)

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Pressure Test for Leaks

• Install pressure gauge on drain valve, and close
  the cold water inlet to the water heater (make
  sure all faucets are off)
• Turn thermostat up until main burner fires and
  let the pressure increase 15-20 PSI, then shut
  off heater
• A sudden pressure drop indicates a tank failure,
  if the pressure holds for 10-15 minutes the tank
  is not leaking

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Pilot Cannot be Lit

• No incoming gas
• Re-settable Thermal Switch has opened due to a
  Flammable Vapor incident or Lint, Dust and Oil
  accumulation
• Gas control knob in Off position
• Pilot knob not depressed while lighting
• Pilot orifice obstructed or pilot tube kinked

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Pilot Will Not Stay Lit

• Thermocouple connection loose at valve
• Thermocouple not being sufficiently heated by
  pilot
• High draft conditions
• Defective thermocouple
• Open E.C.O.
• Weakened Magnet in Gas Valve

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Main Burner Will Not Come On

• Thermostat setting too low for desired
  temperature, tank temperature satisfied
• Thermostat differential thermostat may be out
  of calibration. Replace gas control valve if
  necessary.
• Insufficient gas supply
• Insufficient combustion air supply

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Not Enough Hot Water

• Thermostat set to low
• Cold water inlet water temperature very cold or
  dip tube is defective
• High demand periods
• Water heater too small for household demand

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How It Affects The Trade

• No dimensional changes
• No additional installation steps required
• No water heater stand required for garage
  installations
• Minimal additional troubleshooting required
• Additional cost for heater

Local codes may still require stands
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Youll Have Only Yourself To Blame
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Your Future is Our Future