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GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER.
Immediately call a qualified service technician to inspect the appliance and
to replace any part of the control system and any gas control which has
been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE HEATER
UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED
SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING.
Heater must be protected from freezing downdrafts during shutdown
periods.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the National Electric
Code and/or local codes. These must be followed in all cases.
This water heater must be connected to a grounded metal, permanent
wiring system; or an equipment grounding conductor must be run with the
circuit conductors and connected to the equipment grounding terminal or
lead on the water heater, see Figure 5.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR
IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS.
SUCH CORROSION MAY RESULT IN FAILURE AND RISK OF
ASPHYXIATION.
TABLE OF CONTENTS
Page
ROUGH-IN DIMENSIONS .................................................................. 2
FOREWORD ................................................................................... 2
GENERAL SAFETY INFORMATION
Precautions ................................................................................ 3
Grounding Instructions ............................................................... 3
Chemical Vapor Corrosion .......................................................... 3
Liquid Petroleum Models .............................................................. 3
Extended Non-use Periods ......................................................... 3
Insulation Blankets ...................................................................... 3-4
High Altitude Installations ............................................................. 4
Circulating Pump ......................................................................... 4
Dishwashing Machine Requirements .......................................... 4
INSTALLATION INSTRUCTIONS
Required Ability ........................................................................... 4
Locating The Heater ................................................................... 4-5
Clearances ................................................................................. 5
Hard Water ................................................................................. 5
Air Requirements ........................................................................ 5
Venting ....................................................................................... 6
Thermometers (Not Supplied) ...................................................... 6
Water Potable Heating and Space heating ................................... 6
Relief Valve ................................................................................ 6-7
Gas Piping .................................................................................. 7
Heater Wiring ............................................................................. 8
Wiring Diagram ........................................................................... 8
Purging ....................................................................................... 9
Gas Pressure Regulation ........................................................... 9
OPERATION ................................................................................... 9
To Operate The Heater .............................................................. 9
Lighting Instructions ................................................................... 10
Temperature Regulation ............................................................. 11
Checking Venting ....................................................................... 11
High Temperature Cut-Off Switch .............................................. 11
SERVICE INFORMATION ................................................................. 12-13
Main Burner and Igniter .............................................................. 12
Checking Gas Input .................................................................... 12
Vent System .............................................................................. 12
Blower Maintenance .................................................................. 12
Relief Valve ............................................................................... 12-13
Hot Water Odor ......................................................................... 13
Winter Protection ....................................................................... 13
Replacement Parts ..................................................................... 13
PREVENTIVE MAINTENANCE ......................................................... 13-14
Procedure for Periodic Removal Of Lime Deposits ...................... 13
Deliming Solvents ...................................................................... 13
Tank Cleanout Procedure ........................................................... 13-14
CHECKLIST .................................................................................... 14-15
Condensation ............................................................................ 15
Cathodic Protection-Anode ........................................................ 15-16
Service & Repair ....................................................................... 16
TROUBLESHOOTING ..................................................................... 16-18
LIMITED WARRANTY ...................................................................... 19
Spray can propellants, cleaning solvents, refrigerator and air conditioning
refrigerants, swimming pool chemicals, calcium and sodium chloride (water
softener salt), waxes, and process chemicals are typical compounds which
are potentially corrosive. Do not store products of this sort near the heater.
Also, air which is brought in contact with the heater should not contain any
of these chemicals. If necessary, uncontaminated air should be obtained
from remote or outside sources. The limited warranty is voided when
failure of water heater is due to a corrosive atmosphere. (Refer to the
limited warranty for complete terms and conditions.)
LIQUID PETROLEUM MODELS
Water heaters for propane or liquefied petroleum gas (LPG) are different
from natural gas models. A natural gas heater will not function safely on LP
gas and no attempt should be made to convert a heater from natural gas to
LP gas.
Your BTI-80 and 100-110 series are not for use with LP gas.
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED
BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME
(GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS
EXTREMELY FLAMMABLE. To reduce the risk of injury under these
conditions, it is recommended that the hot water faucet be opened for
several minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there will
probably be an unusual sound such as air escaping through the pipe as the
water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN FLAME
NEAR THE FAUCET AT THE TIME IT IS OPEN.
INSULATION BLANKETS
Insulation blankets available to the general public for external use on gas
water heaters are not approved for use on your A.O. Smith water heater.
The purpose of an insulation blanket is to reduce the standby heat loss
encountered with storage tank water heaters. Your A.O. Smith water
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