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A.O. Smith BTR 119 SERIES - User Manual

A.O. Smith BTR 119 SERIES
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COMMERCIAL GAS HIGH EFFICIENCY WATER HEATERS
Service Handbook
PRINTED IN THE U.S.A. 1016 100277701_2000536453_Rev A
500 Tennessee Waltz Parkway
Ashland City, TN 37015
FOR MODELS:
BTR 120 thru 400(A) Series 118 & 119
INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS -
CONSTRUCTION - OPERATION & SERVICE - TROUBLESHOOTING
SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN

Questions and Answers

  • M
    Mr. Ricky EdwardsAug 12, 2025
    Why is there insufficient hot water from my A.O. Smith BTR 119?
    • M
      Mario MillerAug 12, 2025
      If you're not getting enough hot water from your A.O. Smith Water Heater, first, make sure the thermostat isn't set too low by adjusting it to a higher temperature. Also check if the main manual gas shutoff valve is fully opened. If the heater is too small for your needs, try spacing out your usage to allow the heater more time to reheat the water.
  • M
    Matthew BlackAug 16, 2025
    How to fix not hot enough water in A.O. Smith BTR 119?
    • B
      brentalvaradoAug 16, 2025
      If your A.O. Smith Water Heater isn't heating water enough, try adjusting the thermostat to a higher temperature. If the problem persists, it could be due to upper or lower temperature probes being out of calibration, in which case you should call a qualified service agency to check and replace them if necessary.
  • R
    Regina HernandezAug 20, 2025
    How to stop water leaks from A.O. Smith BTR 119 Water Heater?
    • Y
      ymichaelAug 20, 2025
      If your A.O. Smith Water Heater is leaking water, it might be due to the drain valve not being closed tightly. Try closing it tightly, and if it still leaks, replace the valve. If you cannot identify the source of the leak, shut off the gas and cold water supply to the heater and call a qualified service agency.
  • J
    jessicajacksonAug 23, 2025
    What to do if water temperature is too hot in A.O. Smith BTR 119 Water Heater?
    • G
      George CoffeyAug 23, 2025
      If the water from your A.O. Smith Water Heater is too hot, the thermostat might be set too high. Try setting the thermostat to a lower setting.
  • S
    Shawn MarksAug 27, 2025
    What to do if I smell gas odors from A.O. Smith BTR 119 Water Heater?
    • M
      michael99Aug 27, 2025
      If you notice gas odors coming from your A.O. Smith Water Heater, it could be due to the heater being overfired or possible gas leaks. Immediately shut off the gas supply to the heater and call a qualified service agency or your gas company.
  • K
    kreyesAug 30, 2025
    Why is my A.O. Smith BTR 119 Water Heater rumbling?
    • D
      Deborah CaldwellAug 30, 2025
      If your A.O. Smith Water Heater is making rumbling noises, it's likely due to sediment accumulation at the bottom of the tank. Try draining some water through the drain valve to remove the sediment. If the rumbling continues, you may need to call a qualified service agency to delime the heater.
  • P
    pamela59Sep 3, 2025
    What causes pounding or water hammer in A.O. Smith BTR 119?
    • B
      Brad LozanoSep 3, 2025
      If your A.O. Smith Water Heater is making pounding or water hammer noises, it could be because the air chambers in the piping have become waterlogged, or the thermal expansion tank is damaged, improperly charged, or improperly sized. Try draining the piping system and refilling it, making sure the heater is off during this process. Also, check the thermal expansion tank charge pressure when the water system pressure is zero.
  • N
    Nicholas ThomasSep 7, 2025
    What causes combustion noises in A.O. Smith Water Heater?
    • J
      James HarrisSep 7, 2025
      Combustion noises in your A.O. Smith Water Heater may be caused by too much primary air. Try adjusting the shutters. Alternatively, the heater might be overfired or have incorrect burners for the gas type used, which requires a call to a qualified service agency for checking and correction.

Summary

Installation Considerations

Thermal Expansion Effects

Explains thermal expansion effects and the need for expansion tanks.

Air Requirements for Operation

Highlights importance of proper combustion and ventilation air.

Contaminated Air Hazards

Warns about contaminants in combustion air and their effects.

Gas Supply Systems and Regulators

Gas Piping Guidelines

Gas Piping and Sediment Trap Installation

Integrated Temperature Control-High Limit Switch

Electronic Ignition Control;Ignition Module

Troubleshooting Checklist

General Service Chart

Fault and Warning Codes - Continued

Effikal Flue Damper Troubleshooting Guide

Damper Diagnostic Tests

Test for 24 VAC on Damper PC Board

Tests for 24VAC on the damper PC board to diagnose opening issues.

Test the Three Amp Fuse

Checks the 3-amp fuse for continuity and proper voltage.

Damper and Harness Testing

Test for 24 VAC on Damper PC Board (Black;Yellow)

Tests 24VAC on the damper PC board for correct operation.

Wire Harness Test Procedure

Tests the wire harness connections to the IID module.

IID Module Testing

IID Module Test (Power to Pilot Valve)

Tests for 24VAC at the PV terminal on the IID during ignition trial.

Pilot Spark Test

Flame Rectification Test

IID Module Main Burner Test

IID Module Test (MV Terminal)

Tests for 24 VAC between the MV terminal and ground on the IID.

Main Burner Ignition Test

A.O. Smith BTR 119 SERIES Specifications

General IconGeneral
CategoryWater Heater
ModelBTR 119 SERIES
Power SourceElectric
ThermostatAdjustable
Voltage120V
Dimensions520mm (Diameter) x 1210mm (Height)
Weight35 kg
Warranty5 years

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