A.O. Smith Understanding the FVIR System and Replacing Your Water Heater's Gas Valve
Page 29

Replacing the Gas Valve:

1.To replace the gas control valve/thermostat, reassemble in reverse order. When replacing the gas control valve/thermostat, thread a correctly sized pipe into the inlet and use it to turn the gas valve (clockwise.) DO NOT OVER TIGHTEN or damage may result. NOTE: Use an approved TEFLON(Rtape or pipe

compound only on the threaded section of the gas control valve/thermostat that screws into the tank.

2.Reconnect the gas piping to the gas control valve/ thermostat. NOTE: Use an approved Teflon tape or pipe compound on the gas piping connections.

3.Attach the igniter and bracket to the new gas control valve/thermostat, clipping it at the back edge of thermostat and snapping it into place. NOTE: Do not use the (pilot) ferrule nut supplied with the new gas control valve/thermostat, unless the existing nut is not usable. Reconnect the pilot tube, manifold tube, igniter wire, and thermal switch wires. NOTE: L.P. gas systems

use reverse (left-hand) threads on the manifold tube.

4.Fill the tank completely with water. NOTE: To purge the lines of any excess air, keep the hot water faucet open for 3 minutes after a constant flow of water is obtained.

5.Turn on the gas supply and test the gas supply connections by brushing on an approved noncorrosive leak detection solution. Bubbles forming indicate a leak. Correct any leak found.

6.Check the operation of the burner by following the lighting instructions on the front of the water heater. With the burner lit, check the gas control valve/ thermostat supply line, manifold tube and pilot tube connections for leaks.

7.Verify proper operation and then replace the outer door.

8.If additional information is required, contact Residential

Technical Assistance by referencing the number on the water heater.

TEFLON ® is a registered trademark of E.I. Du Pont De Nemours and Company

FVlR System Operational

Checklist

 

 

 

1.

Manifold gasket properly sealed.

 

5.

No leaks

at pilot and manifold connection.

2.

Viewportnot damaged or cracked.

6.

Manifold door screws securely tightened.

3.

Flame-arrestorfree of debris and undamaged.

7.

Depress

the button on the thermal switch

4.Two piece wire connector properly installed.

PROBLEM

BURNER WILL NOT IGNITE

SMELLY WATER

BURNER FLAME YELLOW- LAZY

PILOT WILL NOT LIGHT OR REMAIN LIT

POSSIBLE CAUSE(S)

1.Pilot not lit

2.Thermostat set too low

3.No gas

4.Dirt in the gas lines

5.Pilot line clogged

6.Main burner line clogged

7.Non-functioning thermocouple

8.Non-functioning thermostat

9.Heater installed in a confined area

1.Sulfides in the water

1.Insufficient secondary air

2.Low gas pressure

3.Water heater flue or vent system blocked

4.Main burner line clogged

5.Heater installed in a confined area

6.Obstruction in main burner orifice

1.Non-functioning igniter

2.The thermal switch tripped

3.Wire lead connection at thermal switch loose

CORRECTIVE ACTION

1.Light pilot

2.Turn tem£. dial to desired temperature

3.Check wtth gas utility company

4.Notify utility-install trap in gas line

5.Clean, locate source and correct

6.Clean, locate source and correct

7.Replace thermocouple

8.Replace thermostat

9.Provide fresh air ventilation

1.Replace the anode with a special anode

1.Provide ventilation to water heater

2.Check with gas utility company

3.Clean, locate source and correct

4.Clean, locate source and correct

5.Proper fresh air ventilation

6.Clean or replace orifice

1.Replace igniter pilot assembly

2.See Pilot Ltght Troubleshooting Flowchart section

3.Remove and reconnect the wire leads at

thermal switch, confirm connections are tight and not loose

4.

Thermocouple

connection loose

4.

Finger tighten; then 1/4 turn with

wrench

5.

Air in gas

line

 

 

5.

Bleed

the air from

the gas line

 

6.

Low gas

pressure

 

6.

Check with gas utility company

 

7.

No gas

 

lines

 

 

7.

Check with gas utility company

 

8.

Dirt

in gas

 

 

8.

Notify

utility-install

dirt trap in gas line

9.

Cold

drafts

 

 

 

9.

Locate

source and

correct

 

10.

Thermostat

ECO

switch open

10.

Replace thermostat

 

11.

Pilot

line or orifice

clogged

11.

Clean,

locate source and correct

 

12.

Non-functioning

thermocouple

12.

Replace thermocouple

 

13.

Air for combustton

obstructed

13. See maintenance

section for inspection and

 

 

 

 

 

 

 

 

cleaning of flame trap

 

14.

Flammable

vapors

incident, FVIR

14.

Replace water heater, eliminate

flammable

 

function actuated

 

 

vapors source. Contact Residential Technical

 

 

 

 

 

 

 

 

Assistance

 

 

29

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Contents Smith InstallerWater Important Definitions Fire Hazard Improper installation and use may result in property damageFire or Explosion Harzard GET to Know Your Water Heater GAS Models Consumer Responsibilities Important Information About This Water HeaterConsumer Information Site Location Location RequirementsPmpey Damage Hazard Clearances and AccessibilityGas Pressure Gas Pressure TestingGas Requirements Gas PipingExplosion Hazard LP Gas OnlyConfined Space Unconfined SpaceCarbon Monoxide Warning RoomLouvers and Grilles All Air from Inside the BuildingAll Air from Outdoors PER Open Draft Hood InstallationChimney Connection Vent ConnectorsVent Pipe Size MA,NTA,N\ Piping InstallationClosed System/Thermal Expansion Propey Damage HazardTemperature & Pressure Relief Valve Temperature and Pressure Relief Valve Explosion HarzardRelief Valve and Pipe Insulation Some Models Combination Space Heating/Potable Water SystemAIR Solar InstallationGas Supply and Piping Vent Pipe SystemWater System Piping Before Lighting InstructionsChecking the Draft ForyoursafetyreadbeforelightingToturnoffgastoappliance Burn HazardBurner Flames Water Temperature RegulationEmergency Shut Down White Rodgers ValvesCondensation Operational ConditionsProperty Damage Hazard Draining and Flushing Routine Preventive MaintenanceAnode Rod/Water Odor Removing the Burner from the Manifold/ Burner Assembly Replacement PartsManualrelief ThermalReplacing the Thermocouple Replacing the Pilot/Pilot Tube AssemblyCleaning the Combustion Chamber and Flame-arrestor Replacing the Manifold/Burner AssemblyExternal Inspection & Cleaning of the Base-Ring Filter Removing and Replacing the Gas Control Valve/Thermostat Testing the Igniter SystemPiezoelectric Igniter System Possible Causes FVlR System Operational ChecklistThermostat set too high ProblemYES Repair Parts List Listed Parts Kits and Illustrations Page Conditions and Exceptions Limited Residential GAS WarrantyInstallation Information Claim ProcedureLimitation on Implied Warranties Disclaimers

Water Heater specifications

A.O. Smith is a renowned name in the water heating industry, celebrated for its commitment to innovation, quality, and efficiency. Their water heaters are designed to cater to a wide variety of needs, making them suitable for both residential and commercial applications. The main features of A.O. Smith water heaters are tailored to ensure optimal performance, convenience, and reliability.

One of the standout characteristics of A.O. Smith water heaters is their impressive energy efficiency. Many models are equipped with advanced insulation technologies that minimize heat loss, allowing users to save on energy bills while ensuring a consistent supply of hot water. The introduction of high-efficiency gas burners and electric heating elements enhances their energy utilization, which is reflected in their excellent Energy Factor ratings.

A.O. Smith also incorporates smart technology in its water heaters. Many models feature integrated Wi-Fi connectivity, allowing homeowners to monitor and control their water heating system remotely via a smartphone app. This capability enables users to adjust temperature settings, receive maintenance alerts, and track energy usage, providing a new level of convenience and control.

Durability is another hallmark of A.O. Smith water heaters. Constructed with high-quality materials, these units often feature a glass-lined tank that enhances corrosion resistance. Additionally, many models are designed with a robust anode rod that helps prevent rusting, extending the lifespan of the heater and ensuring dependable service for years to come.

Safety features are also a priority for A.O. Smith. Many water heaters come equipped with advanced safety mechanisms, such as automatic shut-off valves, temperature controls, and flame failure detection systems, ensuring safe operation and reducing the risk of accidents.

Different models are available to suit varying space requirements and preferences. A.O. Smith produces traditional tank water heaters as well as modern tankless options, which provide endless hot water on demand, making them ideal for homes needing high hot water consumption. Their versatility guarantees that customers can find the perfect solution tailored to their specific needs.

In conclusion, A.O. Smith water heaters represent a blend of innovation, efficiency, durability, and safety. With various models available that cater to different heating needs and preferences, A.O. Smith continues to remain a trusted choice for consumers seeking reliable hot water solutions.
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