A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual
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A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual

A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual

Residential gas water heaters
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HIGH EFFICIENCY ATMOSPHERIC VENT
GAS WATER HEATER
(FLAMMABLE VAPOR IGNITION RESISTANT)
FOR SPACE HEATING AND POTABLE WATER HEATING ONLY.
NOT FOR USE IN MOBILE HOMES.
This water heater complies with ANSI Z21.10.1-current
edition regarding the accidental or unintended ignition of
fl ammable vapors, such as those emitted by gasoline.
• Safety Instructions
• Installation
• Operation
INSTALLER:
•
AFFIX THESE INSTRUCTIONS TO OR ADJACENT
TO THE WATER HEATER.
OWNER:
•
RETAIN THESE INSTRUCTIONS AND WARRANTY
FOR FUTURE REFERENCE. RETAIN THE
ORIGINAL RECEIPT AS PROOF OF PURCHASE.
WARNING: Gas leaks can not always be detected by
smell.
Gas suppliers recommend that you use a gas detector
approved by UL or CSA.
For more information, contact the your gas supplier.
If a gas leak is detected, follow the "WHAT TO DO IF YOU
SMELL GAS" instructions.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS PURCHASED.
IF YOU ARE UNSUCCESSFUL, CONTACT RESIDENTIAL TECHNICAL ASSISTANCE AT 1-800-527-1953 OR WWW.HOTWATER.COM.
PRINTED IN THE U.S.A 0810
• Care and Maintenance
• Troubleshooting
• Parts List
Installation Instructions and Use & Care Guide
RESIDENTIAL GAS WATER HEATERS
AN ODORANT IS ADDED TO THE GAS USED
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
— 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 instructions.
•
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.
1

For Your Safety

BY THIS WATER HEATER.
PART NO. 315456-004

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Summary of Contents for A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER

  • Page 1: Water Heater Safety

    Installation Instructions and Use & Care Guide RESIDENTIAL GAS WATER HEATERS HIGH EFFICIENCY ATMOSPHERIC VENT GAS WATER HEATER (FLAMMABLE VAPOR IGNITION RESISTANT) FOR SPACE HEATING AND POTABLE WATER HEATING ONLY. NOT FOR USE IN MOBILE HOMES. This water heater complies with ANSI Z21.10.1-current edition regarding the accidental or unintended ignition of fl...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Water Heater Safety ................................... 1-4 Safe Installation, Use and Service ..............................3 Safety Precautions .................................... 3-4 Typical Installation ....................................5 Installing Your Gas Water Heater ..............................6-8 Important Information About Your Water Heater ........................6 Consumer Information ................................6 Consumer Responsibilities ..............................

  • Page 3: Safe Installation, Use And Service

    SAFE INSTALLATION, USE AND SERVICE Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater. Many safety-related messages and instructions have been provided in this manual and on your water heater to warn you and others of a potential hazard.
  • Page 4 Breathing Hazard - Carbon Monoxide Gas Install vent system in accordance with Fire or Explosion Hazard codes. Do not operate water heater if flood Do not store or use gasoline or other flammable vapors and damaged liquids in the vicinity of this or any other appliance. Heater should not be installed for High Avoid all ignition sources if you smell Natural or LP gas.

  • Page 5: Typical Installation

    TYPICAL INSTALLATION GET TO KNOW YOUR WATER HEATER - GAS MODELS A Vent Pipe K Outer door U Main Burner B Draft hood Union Flue C Anode (Not Shown) M Inlet Water Shut-off Valve W Suitable Metal Drain Pan D Hot Water Outlet N Cold Water Inlet Control Display Insulation...

  • Page 6: Installing Your Gas Water Heater

    INSTALLING YOUR GAS WATER HEATER Unpacking the Water Heater Important Information About This Water Heater This gas water heater was manufactured to voluntary safety standards to reduce the likelihood of a flammable WARNING vapor ignition incident. New technology used in meeting these standards makes this product more sensitive to Excessive Weight Hazard installation errors or improper installation environments.

  • Page 7: Location Requirements

    Location Requirements If flammable liquids or vapors have spilled or leaked in the area of the water heater, leave the area immediately and call the fire department from a neighbor’s home. Do not attempt to clean the spill until all ignition sources have WARNING been extinguished.

  • Page 8: Clearances And Accessibility

    EXHAUST FAN REVERSE FLOW OF GASES IMPORTANT: The water heater should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the water heater or to lower FIGURE 2. floors of the structure.

  • Page 9: Gas Supply

    GAS SUPPLY WARNING Manual Gas Shut-Off Valve Ground Joint Union Install a readily acces- sible manual shut-off Discharge Pipe valve in the gas supply (Do Not plug or cap) line as recommended by the local utility. Explosion Hazard Check with local utility for minimum height.

  • Page 10: Gas Pipe Capacity Table

    Gas Pipe Capacity Table WARNING WARNING Explosion Hazard Explosion Hazard • Use a new CSA approved gas supply line. • Gas leaks can not always be detected by smell. • Install a shut-off valve. • Gas suppliers recommend that you use a gas detector approved by UL or CSA.

  • Page 11: Combustion Air And Ventilation

    COMBUSTION AIR & VENTILATION TABLE 3 WARNING Minimum Square Typical Room BTUH Input Feet with Carbon Monoxide Warning with 8’ Ceiling 8’ Ceiling Water heater must be vented to outdoors. 30,000 9 x 21 Vent must be installed by a qualified technician using the installation instructions.

  • Page 12: All Air From Inside The Building

    Attic or crawl spaces cannot be closed and must be properly ventilated to the outside. 12” Max. Ductwork must be of the same cross-sectional area as the free area of the opening to which they connect. The minimum dimension of rectangular air ducts cannot be less than three inches.

  • Page 13: Vent Pipe System

    Alternative Gable Vent Opening to Outdoor Location Install Above Insulation Confined Space 1 sq. in. per 3000 BTUH Confined Space Outlet Air to the Attic 1 sq. in. per 4000 BTUH Inlet Air from the Crawl Space Alternative Air Inlet All Air From Outdoors - Using A Single Permanent Opening FIGURE 8B.

  • Page 14: Vent Pipe Size

    40 Gal. Water Heater: Align the reducer flue over top of used for venting solid fuel appliances or fireplaces. Also baffle as shown in Figure 9 (NOTE: reducer flue must be consult local and state codes for proper chimney sizing installed on 40 gal.

  • Page 15: Water System Piping

    Figures 10-12 are examples of vent pipe system WATER SYSTEM PIPING installations and may or may not be typical for your specific application. Consult the “National Fuel Gas Code”, Piping Installation NFPA 54, ANSI Z223.1-current edition and the guidelines set forth by prevailing local codes. Piping, fittings, and valves should be installed according to the installation drawing (Figure 13).

  • Page 16: Closed System/Thermal Expansion

    Closed System/Thermal Expansion In a closed system use a thermal expansion tank Cold Water Pressure Reducing Inlet Valve Valve with Bypass Hot Water Outlet Cold Water Supply to Fixture Main Water Supply Temperature and Pressure (T&P) Relief Valve (Optional Top T&P Relief Valve Not Shown) Massachusetts: Install a vacuum relief...

  • Page 17: T&P Relief Valve And Pipe Installation

    For protection against excessive pressures and pipe. Also ensure that the base of insulation is flush with temperatures, a temperature and pressure relief valve must the water heater. Once seated, secure the insulation with be installed in the opening marked “T & P RELIEF VALVE” duct tape, electrical tape, or equivalent.

  • Page 18: Solar Installation

    Electrical Connections A diaphragm-type expansion tank suitable for potable water will normally eliminate this weeping condition. Please read and follow the manufacturer’s instructions for WARNING the installation of such tanks. Must Be Vertical To Electric Shock Hazard Domestic Remove Air Bubbles Expansion Tank Hot Water Vacuum...

  • Page 19: Important Information About This Water Heater

    IMPORTANT INFORMATION ABOUT THIS WATER HEATER This gas water heater was manufactured to voluntary safety standards to reduce the likelihood of a flammable vapor ignition incident. The new technology used in meeting these standards makes this product more sensitive to installation errors.

  • Page 20: Operating Your Water Heater

    OPERATING YOUR WATER HEATER Operating Instructions WARNING Read and understand these directions thoroughly before attempting to operate the water heater. Make sure the view Explosion Hazard port is not missing or damaged (See Figure 25). Make sure the tank is completely filled with water before Replace view port if glass is missing operating the water heater.

  • Page 21: Checking The Draft

    Water Heater Operation Checking the Draft Figure 17 below shows the water heater’s sequence of operation when a call for heat is initiated. The ignition WARNING control module will attempt to light the burner three times. If the ignition control does not detect ignition it will enter lockout mode, indicated by display flashing status code Burn Hazard (see status code 3 page 30 and/or status code 8 page 31).

  • Page 22: Burner Flames

    Burner Flames heater. Mixing valves are available at plumbing supply or hardware stores, see Figure 14. Follow manufacturer’s Inspect the burner flames through the viewport and instructions for installation of the valves. Before changing compare them to the drawings in Figure 19. A properly the factory setting on the thermostat see Figures 20 and operating burner should produce a soft blue flame.

  • Page 23: Operational Conditions

    losses and may satisfy your normal hot water needs. If hot Good venting is essential for a gas fired water heater water use is expected to be more than normal, a higher to operate properly as well as to carry away products of thermostat setting may be required to meet the increased combustion and water vapor.

  • Page 24: Routine Preventive Maintenance

    Draining and Flushing Powered Anode Operation To protect the glass-lined water tank from corrosion through electrolysis, this water heater is equipped with a non sacrificial powered anode rod. The powered anode rod is non sacrificial and should not need to be replaced unless damaged.

  • Page 25: Temperature And Pressure Relief Valve

    Temperature and Pressure Relief Valve properly. To prevent water damage, the valve must be pro- perly connected to a discharge line which terminates at an adequate drain. Standing clear of the outlet (discharged water may be hot), slowly lift and release the lever handle on the temperature and pressure relief valve to allow the valve to operate freely and return to its closed position.

  • Page 26: Replacing The Flame Sense/Hot Surface Igniter Assembly

    Replacing the Flame Sense/Hot Surface igniter Cleaning the Combustion Chamber and Air Assembly Diverter Assembly 1. Remove the manifold/burner assembly. See Removing 1. Follow procedure outlined in “Removing the Manifold/ the Manifold/Burner Assembly. Burner Assembly”. 2. Use a vacuum cleaner/shop vac to remove all loose 2.

  • Page 27: Removing And Replacing The Gas Control Valve/Thermostat

    3. Insert the manifold/burner assembly into the burner 3. Turn off the gas supply to the water heater at the manual gas shut-off valve. This valve is typically located compartment making sure that the tip of the manifold beside the water heater. Note the position of the shut- tube engages in the slot of the bracket inside the off valve in the open/on position then proceed to turn it combustion chamber (Figure 29).

  • Page 28: Fvir System Operational Checklist

    Pressurized Combustion Chamber System Operational Checklist Manifold gasket properly sealed. No leaks at manifold connection. Manifold door screws securely tightened. Viewport not damaged or cracked. Combustion chamber free of debris and undamaged. Manifold component block properly installed. TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION 1.
  • Page 29 continued: PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION 1. Improperly sealed, hot or cold supply 1. Tighten threaded connections. connections, relief valve, drain valve or thermostat threads. WATER LEAKS 2. Leakage from other appliances or 2. Inspect other appliances near water heater. water lines.
  • Page 30 ELECTRONIC CONTROL DISPLAY TROUBLESHOOTING ELECTRONIC CONTROL DISPLAY Please check guidelines below. For your safety, water heater service should be performed only by a qualified service person. GENERAL SAFETY INFORMATION Read the supplied by the water heater manufacturer. CONTROL DISPLAY STATUS PROBLEM SOLUTION 1.
  • Page 31 CONTROL DISPLAY STATUS PROBLEM SOLUTION 1. Clean the screen on the combustion air “P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing The air pressure switch contacts intake chamber. Turn the power “OFF” for 10 to 20 seconds then “ON” again to clear remain open longer than 11 the error code.
  • Page 32 CONTROL DISPLAY STATUS PROBLEM SOLUTION 4. System must be manually reset by entering a “FV-SENSE” Flashing special FVS reset sequence into the Electronic (Continued from previous page) Control Display. Contact a service agency to determine the cause and instructions on the reset sequence.
  • Page 33 TROUBLESHOOTING FLOWCHART APPLY POWER TO APPLIANCE REQUEST FOR HEAT PRESENT? 3 MINUTE AUTOMATIC RESET TIME DELAY WAIT FOR PRESSURE PRESSURE SWITCH SWITCH TO OPEN PROVEN OPEN WITHIN DISPLAY ERROR SECONDS? NUMBER COMBUSTION FAN ON WAIT FOR PRESSURE PRESSURE SWITCH SWITCH TO OPEN PROVEN OPEN WITHIN DISPLAY ERROR SECONDS?

  • Page 34: Control Display Troubleshooting

    REPAIR PARTS ILLUSTRATION When ordering repair parts always give the following information: Model, serial, and product number Type of gas Item number Parts description Repair Parts List Item Parts Description Draft Hood Flue Baffle Nipple (Hot) Nipple (Cold) Anode Rod Cold Water Inlet Tube Temperature and Pressure Valve Control Display...

  • Page 35: Listed Parts Kits And Illustrations

    Listed Parts Kits and Illustrations Item 12: Burner (Natural Gas) Item 13: Flame Sense/Hot Surface Igniter Assembly. Item 14: Manifold door assembly which contains the manifold tube, gasket, manifold door, manifold component block with retainer clip, and flame sense/hot surface igniter assembly. (Natural Gas) Item 15: Contains manifold component block with retainer clip.

  • Page 36: Notes

    NOTES...
  • Page 37 NOTES...

  • Page 38: Notes

    NOTES...

  • Page 39: Warranty

    LIMITED RESIDENTIAL GAS WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL • in its original installation location; OWNER ONLY in accordance with the warranty terms and • in the United States, its territories or possessions, and conditions specifi ed below. Canada;...
  • Page 40 LIMITATION ON IMPLIED WARRANTIES NOT BE RESPONSIBLE FOR WATER DAMAGE, LOSS OF USE OF THE UNIT, INCONVENIENCE, LOSS OR DAMAGE Implied warranties, including any warranty of merchantability TO PERSONAL PROPERTY, OR OTHER CONSEQUENTIAL imposed on the sale of this heater under state law are limited DAMAGE.

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