A.O. Smith 315456-002 Installation Instructions And Use And Care Manual

A.o. smith residential hybrid gas water heater instruction manual
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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 0410
• 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. 315456-002

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Summary of Contents for A.O. Smith 315456-002

  • Page 1: Water Heater Safety

    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. PART NO. 315456-002...
  • Page 2: 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 ... 6 Unpacking the Water Heater ...
  • Page 3: 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 Fire or Explosion Hazard Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Avoid all ignition sources if you smell Natural or LP gas. Do not expose water heater control to excessive gas pressure.
  • Page 5: Typical Installation

    GET TO KNOW YOUR WATER HEATER - GAS MODELS A Vent Pipe B Draft hood C Anode (Not Shown) D Hot Water Outlet Insulation Gas Supply Piping G Manual Gas Shut-off Valve H Ground Joint Union Drip Leg (Sediment Trap) Inner Door INSTALL IN ACCORDANCE WITH LOCAL CODES.
  • Page 6: Installing Your Gas 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. New technology used in meeting these standards makes this product more sensitive to installation errors or improper installation environments. Please review the Installation Checklist found at the end of the installation instructions section and make any required installation upgrades or changes.
  • Page 7: Location Requirements

    Location Requirements WARNING Carbon Monoxide Poisoning Hazard Do not install in a mobile home. Doing so can result in carbon monoxide poisoning and death. The FVIR System is designed to reduce the risk of flammable vapor-related fires. Flammable liquids (such as gasoline, solvents, propane, etc,) emit flammable vapors which can be ignited by a gas water heater’s hot surface igniter or main burner.
  • Page 8: Clearances And Accessibility

    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 floors of the structure. Due to the normal corrosive action of water, the tank will eventually leak after an extended period of time.
  • Page 9: Gas Supply

    WARNING Explosion Hazard • Use a new CSA approved gas supply line. • Install a shut-off valve. • Do not connect a natural gas water heater to an L.P. gas supply. • Do not connect an L.P. gas water heater to a natural gas supply.
  • Page 10: Gas Pipe Capacity Table

    Gas Pipe Capacity Table WARNING Explosion Hazard • Use a new CSA approved gas supply line. • Install a shut-off valve. • Do not connect a natural gas water heater to an L.P. gas supply. • Do not connect an L.P. gas water heater to a natural gas supply.
  • Page 11: Combustion Air And Ventilation

    WARNING Carbon Monoxide Warning Water heater must be vented to outdoors. Vent must be installed by a qualified technician using the installation instructions. Examples of a qualified technican include: gas technicians, authorized gas company personel, and authorized service persons. Failure to so do can result in death or carbon monoxide poisoning.
  • Page 12: All Air From Inside The Building

    12” Max. Permanent openings to Closet the outside or or other additional confined rooms within space the building 12” Max. FIGURE 4. All Air from Inside the Building When additional air is to be provided to the confined area from additional room(s) within the building, the total volume of the room(s) must be of sufficient size to properly provide the necessary amount of fresh air to the water heater and other gas utilization equipment in the area.
  • Page 13: Vent Pipe System

    Gable Vent to Outdoor Install Above Insulation Confined Space Outlet Air to the Attic 1 sq. in. per 4000 BTUH Inlet Air from the Crawl Space Alternative Air Inlet Open 1 sq. in. per Foundation 4000 BTUH Vent All Air From Outdoors: Inlet Air From Ventilated Crawl Space/Outlet Air To Ventilated Attic FIGURE 6.
  • Page 14: Vent Pipe Size

    Align the legs of the draft hood with the slots provided. Insert the legs and secure the draft hood to the water heater’s top with the four screws provided as shown in Figure 9. Do not alter the draft hood in any way. If you are replacing an existing water heater, be sure to use the draft hood supplied with this water heater.
  • Page 15: Water System Piping

    3 FT. Minimum Support Strap Maintain Clearance* Vent Connector Slope Up 1/4 Inch Per Foot Minimum Venting Gas Vent System With Type B Double Wall Vent Pipe. FIGURE 11. Maintain Manufacturer’s Specified Minimum Clearance Support Strap Seal Maintain Clearance* Vent Connector Slope Up 1/4 Inch...
  • Page 16: Closed System/Thermal Expansion

    Hot Water Outlet Cold Water Supply to Fixture Temperature and Pressure (T&P) Relief Valve (Optional Top T&P Relief Valve Not Shown) Massachusetts: Install a vacuum relief in cold water line per section 19 MGL 142 Discharge line (Do Not Cap or Plug) 1“...
  • Page 17: T&P Relief Valve And Pipe Installation

    For protection against excessive pressures and temperatures, a temperature and pressure relief valve must be installed in the opening marked “T & P RELIEF VALVE” (see Figure 15A). This valve must be design certified by a nationally recognized testing laboratory that maintains periodic inspection of the production of listed equipment or materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22.
  • Page 18: Solar Installation

    A diaphragm-type expansion tank suitable for potable water will normally eliminate this weeping condition. Please read and follow the manufacturer’s instructions for the installation of such tanks. Must Be Vertical To Domestic Remove Air Bubbles Hot Water Vacuum Relief Mixing Valve Valve Water...
  • 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 Instructions Read and understand these directions thoroughly before attempting to operate the water heater. Make sure the view port is not missing or damaged (See Figure 25). Make sure the tank is completely filled with water before operating the water heater. The gas control valve/ thermostat has a “On/Off Switch”...
  • Page 21: Checking The Draft

    Water Heater Operation Figure 17 below shows the water heater’s sequence of operation when a call for heat is initiated. The ignition 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 (see status code 3 page 30 and/or status code 9 page 31).
  • Page 22: Burner Flames

    Burner Flames Inspect the burner flames through the viewport and compare them to the drawings in Figure 19. A properly operating burner should produce a soft blue flame. Blue tips with yellow inner cones are satisfactory. The tips of the flame may have a slight yellow tint. The flame should not be all yellow or have a sharp blue-orange color.
  • Page 23: Operational Conditions

    losses and may satisfy your normal hot water needs. If hot water use is expected to be more than normal, a higher thermostat setting may be required to meet the increased demand. When leaving your home for extended periods (vacations, etc.) Set the electronic control display tem- perature “COOLER”...
  • Page 24: Routine Preventive Maintenance

    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. If the powered anode rod has been damaged then the powered anode rod should be removed and replaced from the water heater tank.
  • Page 25: Temperature And Pressure Relief Valve

    Temperature and Pressure Relief Valve Explosion Harzard • Temperature-pressure relief valve must comply with ANSI Z21.22-CSA 4.4 and ASME code. • Properly sized temperature- pressure relief valve must be installed in opening provided. • Can result in overheating and excessive tank pressure. •...
  • Page 26: Replacing The Flame Sense/Hot Surface Igniter Assembly

    Replacing the Flame Sense/Hot Surface igniter Assembly 1. Remove the manifold/burner assembly. See Removing the Manifold/Burner Assembly. 2. Lift the retainer clip straight up from the back of the manifold component block (using a flat-blade screwdriver), then remove the manifold component block from the manifold door (Figure 26.) 3.
  • Page 27: Removing And Replacing The Gas Control Valve/Thermostat

    3. Insert the manifold/burner assembly into the burner compartment making sure that the tip of the manifold tube engages in the slot of the bracket inside the combustion chamber (Figure 29). 4. Inspect the door gasket and make sure there is no fiberglass insulation between the gasket and the combustion chamber.
  • Page 28: Fvir System Operational Checklist

    Pressurized Combustion Chamber System Operational Checklist Manifold gasket properly sealed. Viewport not damaged or cracked. Combustion chamber free of debris and undamaged. Manifold component block properly installed. PROBLEM 1. Transformer unplugged. 2. No power at outlet. NO HOT WATER 3. Thermostat defective. 4.
  • Page 29 PROBLEM 1. Insufficient secondary air. COMBUSTION ODORS 2. Water heater flue or vent system blocked. 3. Heater installed in a confined area. 1. Improperly sealed, hot or cold sup- ply connections, relief valve, drain valve or thermostat threads. WATER LEAKS 2.
  • Page 30: Control Display Troubleshooting

    Please check guidelines below. For your safety, water heater service should be performed only by a qualified service person. GENERAL SAFETY INFORMATION Read the CONTROL DISPLAY STATUS “POWER” Flashing “HEATING” and “SHORT” Flashing “HEATING” and “OPEN” Flashing “HEATING”, “OPEN”, and “SHORT” Flashing “ECO”...
  • Page 31 cont. CONTROL DISPLAY STATUS “P-SW”, “OPEN”, and “CLEAN SCREEN” Flashing “P-SW” and “SHORT” Flashing “IGN” Flashing “FV-SENSE” Flashing “LDO-SW”, “OPEN”, and “CLEAN SCREEN” Flashing PROBLEM 1. Clean the screen on the combustion air The air pressure switch contacts remain open longer than 5 seconds after the combustion fan 2.
  • Page 32 cont. CONTROL DISPLAY STATUS “FV-SENSE” and “OPEN” Flashing “FV-SENSE” and “SHORT” Flashing “THMSTR” and “OPEN” Flashing “THMSTR” and “SHORT” Flashing All Segments Flashing “P-ANODE” and “OPEN” Flashing “P-ANODE” Flashing PROBLEM 1. Check all wiring to the flammable vapor Flammable Vapor Sensor is open 2.
  • Page 33 TROUBLESHOOTING FLOWCHART APPLY POWER TO APPLIANCE REQUEST FOR HEAT PRESENT? 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 CLOSE PROVEN CLOSED DISPLAY ERROR WITHIN NUMBER SECONDS?
  • Page 34: 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 Air Intake Chamber...
  • 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

    THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY in accordance with the warranty terms and conditions specifi ed below. The warrantor will furnish the ORIGINAL OWNER, 1) a replacement water heater of equivalent size and current model if the glass-lined tank in this water heater leaks and, 2) a replacement part for any component part which fails.
  • Page 40 LIMITATION ON IMPLIED WARRANTIES Implied warranties, including any warranty of merchantability imposed on the sale of this heater under state law are limited to one year duration for the heater or any of its parts. Some states do not allow limitations on how long an implied warranty lasts, so the above limitations may not apply to you.

This manual is also suitable for:

Effex gahh-40Effex gahh-50Premier 317998-002

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