A.O. Smith BT-80 Installation Instructions And Use & Care Manual
A.O. Smith BT-80 Installation Instructions And Use & Care Manual

A.O. Smith BT-80 Installation Instructions And Use & Care Manual

Commercial gas water heater

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Installa on Instruc ons and
Use & Care Guide
Commercial Gas
Commercial Atmospheric Gas Water Heater with the
Flammable Vapor Igni on Resistant Safety System
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have diffi culty following the direc ons, or
aren't sure you can safely and properly do any of this work yourself:
• Call our Technical Assistance Hotline at 1-800-365-0024 . We can help you with in-
stalla on, opera ons, troubleshoo ng, or maintenance. Before you call, write down
the model and serial number from the water heater's data plate.
Incorrect installa on, opera on, or service can damage the water heater, your house
and other property, and present risks including fi re, scalding, electric shock, and
explosion, causing serious injury or death.
Table of Contents Page
IMPORTANT SAFETY INFORMATION ............................................. 3
GETTING STARTED ........................................................................ 7
INSTALLATION ............................................................................. 14
OPERATION ................................................................................. 23
TROUBLESHOOTING ................................................................... 25
MAINTENANCE ........................................................................... 28
NOTES ......................................................................................... 31
REPAIR PARTS ............................................................................. 35
Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.
Water Heater
Retain your original receipt as proof of purchase.
WARNING: If the informa on in
these instruc ons is not followed
exactly, a fi re or explosion may
result causing property damage,
personal injury or death.
Do not store or use gasoline or other
fl ammable 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 build-
ing.
• Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instruc ons.
• If you cannot reach your gas sup-
plier, call the fi re department.
Installa on and service must be per-
formed by a qualifi ed installer, service
agency or the gas supplier.
LOW LEAD
CONTENT
100266461
August 2015

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Summary of Contents for A.O. Smith BT-80

  • Page 1: Table Of Contents

    Installa on Instruc ons and Use & Care Guide Commercial Gas Water Heater Commercial Atmospheric Gas Water Heater with the Flammable Vapor Igni on Resistant Safety System WARNING: If the informa on in Read this manual and the labels on the water heater before you install, these instruc ons is not followed operate, or service it.
  • Page 2: Completed Installation Typical

    COMPLETED INSTALLATION TYPICAL Vent pipe Cold water shut off Expansion tank (Connect to cold water water supply) line Cold water line Dra hood T&P relief valve T&P discharge pipe Gas supply shut off Drain valve Gas supply Drain pan discharge pipe Gas control valve/thermostat...
  • Page 3: Important Safety Information

    IMPORTANT SAFETY INFORMATION Read and follow all safety messages and instruc ons in Important informa on to keep this manual. Fill out this sec on and keep this manual in the pocket of the water This is the safety alert symbol. It is used to alert you to heater for reference.
  • Page 4 IMPORTANT SAFETY INFORMATION o reduce the risk of property Gas Pressure Table 1 damage, serious injury or death, WARNING! The gas supply pressure Time to Produce read and follow the precau ons below, must not exceed the maximum supply Temperature a Serious Burn all labels on the water heater, and pressure as stated on the water...
  • Page 5 IMPORTANT SAFETY INFORMATION • If the water supplied to the water Fire Risk • Keep the water heater from becom- heater is pre-heated (for example, ing wet. Immediately shut the water This water heater is by a solar system) the temperature heater off...
  • Page 6: Carbon Monoxide Risk

    IMPORTANT SAFETY INFORMATION if the T&P Relief Valve or discharge instruc ons. When the installa on is Installa on Accessories pipe is blocked. Do not cap or plug the complete, check the vent’s dra using T&P Relief Valve or discharge pipe. the instruc ons on pages 23-24.
  • Page 7: Getting Started

    GETTING STARTED Review all of the instruc ons codes applicable to the installa on of Combus on and before you begin work. this water heater. Ven la on Air Supply Improper installa on can Before you start, be sure you damage the water heater, your home Before installing the water heater, you have the following tools and...
  • Page 8 GETTING STARTED Example: Ven la on with outside air is recom- acid-forming chemicals such as sulfur, mended for all installa ons. Even if fl uorine, and chlorine. Ven la on with Gas Burning Appliance BTU/HR (kW) Ra ng the water heater is installed in a large, outside air will reduce these chemicals, Gas Water Heater 40,000 (11.72) open room inside the house, outdoor...
  • Page 9 GETTING STARTED A2: Calculate required air volume mum free area is sized according to Table B3: Determine minimum free 3. Two openings must be used when area required for each vent A water heater installed in an unconfi ned ven la ng with air from another room. opening a c or garage requires that the space The outside air can be taken from a...
  • Page 10 GETTING STARTED For example, an installa on area that B5: Check that air source is requires openings with 100 square clean and free of chemicals inches of free area would need 134 Air for combus on and ven la on square inch openings if using metal must be clean and free of corrosive louvers rated at 75% free area (100 sq.
  • Page 11 GETTING STARTED Ven ng Installing a New Vent System upward slope of at least ¼ inch per foot. Install pipe avoiding unnecessary WARNING! Carbon Monoxide The vent pipe must meet the following bends. Pipe joints must be fastened by Hazard. This water heater must be specifi...
  • Page 12: Gas Piping

    GETTING STARTED • The vent pipe must be fi rmly at- Install a readily accessible manual tached and sealed to prevent it shut-off valve in the gas supply line from falling out. as recommended by the local u l- ity. Know the loca on of this valve •...
  • Page 13 GETTING STARTED Space Hea ng con nuous fl ow of water through the air handler circuit during the off cycle. Must be vertical to • The domes c hot water line from the remove air bubbles Domestic water heater should be ver cal past Hot Water any mixing valve or supply line to the Cold...
  • Page 14: Installation

    INSTALLATION ✓ gauge to an outside faucet and mea- Water pressure Step 1: sure the maximum water pressure increase caused experienced throughout a 24-hour ✓ by thermal expansion Verify that your period (highest water pressures o en Verify that you have a properly sized occur at night).
  • Page 15 INSTALLATION increases in water pressure (despite • Install an automa c leak detec- the use of a Pressure Reducing Valve on and shutoff device (available at in the home’s main water supply line). your local plumbing supplier ). These The Safe Drinking Water Act of 1974 devices can detect water leaks and requires the use of backfl...
  • Page 16: Removing The Old Water Heater

    INSTALLATION or oily vapors, at least annually • Avoid loca ons such as a cs, up- Step 2: check and clean the air fi lter. See per fl oors, or where a leak might Verify that the loca on Maintenance sec on for steps on damage the structure or furnish- cleaning the air fi...
  • Page 17 INSTALLATION On the old water heater, turn drain, outside, or in buckets. (Sedi- the control knob on the gas ment in the bo om of the tank may control valve to the clog the valve and prevent it from OFF posi on. draining.
  • Page 18: Installing The New Water Heater

    INSTALLATION line is turned off . Disconnect the gas base that extends beyond the dimen- line from the water heater’s gas sions of the water heater (width and control valve and cap it. depth) by at least 3 inches (76.2 mm) in any direc on.
  • Page 19 INSTALLATION Step 7: Step 6: Install Shutoff and Ther- Connect the Tempera- mosta c Mixing Valves ture and Pressure (T&P) If one is not already installed, Relief Valve/Pipe install a manual shutoff valve Most T&P Relief Valves are pre- in the cold water line that installed at the factory.
  • Page 20: Connect The Water Supply

    INSTALLATION IF YOU HAVE COPPER PIPES: connec ons contain non-metallic parts For water heaters that are fed which could be damaged. The proper by a solar water hea ng If your home has copper water pipes, way to connect the water heater to system (or any other pre- you can solder the water pipe connec- copper water pipes is as follows:...
  • Page 21 INSTALLATION NOTICE: Most water heater models Check inlet and outlet connec- contain energy saving heat traps in the ons and water pipes for leaks. inlet and outlet connec ons. Do not Dry pipes connec ons so that remove the heat traps. any drips or leaks will be apparent.
  • Page 22 INSTALLATION surfaces maintained and suffi cient Z223.1(NFPA 54)-current edi on. Step 11: ✓ room to service the water heater. Check exis ng vent system for rust, ✓ Not installed directly on a carpeted restric ons/obstruc ons. Make Gas Connec ons fl...
  • Page 23: Operation

    OPERATION Ligh ng Instruc ons Turn gas control knob Once the pilot fl ame is estab- lished replace the outer burner counterclockwise to “PILOT”. WARNING! Explosion Hazard – door. Replace viewport if glass is missing or At arm’s length away, turn gas damaged.
  • Page 24: Temperature Control System

    OPERATION Temperature Control • “A” 130°F Allow the water heater’s main • “B” 140°F burner to operate for fi ve System • “C” 150°F minutes. Pass a newly ex n- • “D” 160°F guished match approximately one inch Adjus ng the Temperature from the dra hood’s relief opening.
  • Page 25: Troubleshooting

    TROUBLESHOOTING No Hot Water hot water is simply not warm enough, In this case, the burner will be on all or make sure the faucet you are checking almost all the me, yet you will have very Use the following as a guide to help doesn’t have a defec ve Thermosta c li le hot water.
  • Page 26: Water Odor

    TROUBLESHOOTING water pressure is too high and/or you If the water pressure is between 50 need a Thermal Expansion Tank. See and 60 psi, a Thermal Expansion Tank Step 1 in the Installa on sec on of this is installed and properly pressurized, manual for more informa on.
  • Page 27: Maintenance

    MAINTENANCE Rou ne Maintenance Open a hot water faucet and Remove and inspect the anode let the hot water run un l it is rod and replace if depleted. Rou ne maintenance will help your cool (This may take 10 min The anode rod requires a water heater last longer and work bet- utes or longer).
  • Page 28 MAINTENANCE Refi ll the tank by opening the discharge pipe, turn the gas control cold water supply valve. Make knob to the OFF posi on and call a sure a hot water faucet is qualifi ed person to determine the open and the drain valve is closed.
  • Page 29: Gas Control Valve/Thermostat

    MAINTENANCE Removing and Replacing the objects into the inlet or outlet connec- wrench) and D manifold tube (3/4” ons. Damage to the gas control valve/ wrench) at the gas control valve/ Gas Control Valve/Thermostat thermostat may result. thermostat. NOTE: L.P. Gas systems use IMPORTANT: The gas control valve/ reverse (le -hand) threads on the thermostat is a standard valve with wire...
  • Page 30: Notes

    NOTES 30 • Commercial Gas Water Heater Use and Care Guide...
  • Page 31 NOTES Commercial Gas Water Heater Use and Care Guide • 31...
  • Page 32 NOTES 32 • Commercial Gas Water Heater Use and Care Guide...
  • Page 33 NOTES Commercial Gas Water Heater Use and Care Guide • 33...
  • Page 34 NOTES 34 • Commercial Gas Water Heater Use and Care Guide...
  • Page 35: Repair Parts

    REPAIR PARTS REPAIR PARTS LIST Replacement parts may be ordered through your plumber or the local Item Parts Description Part Number distributor. Parts will be shipped at prevailing prices and billed accord- DRAFT HOOD -------------- ingly. REDUCER RING - SOME MODELS -------------- -------------- FLUE BAFFLE...
  • Page 36: Listed Parts Kits And Illustrations

    REPAIR PARTS Listed Parts Kits and Illustrations Item 11: Pilot/Pilot Tube assembly kit, which contains the pilot and pilot tubing (Natural Gas or L.P.) Item 12: Final burner assembly which contains the burner, orifice, manifold tube, gasket, door, pilot tube, thermocouple, manifold component block with retainer clip, thermal switch, and pilot assembly.

This manual is also suitable for:

Bt-100Bt-80-lp

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