A.O. Smith BTN-120 Instruction Manual
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A.O. Smith BTN-120 Instruction Manual

Commercial gas water heaters
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500 Tennessee Waltz Parkway
Ashland City, TN 37015
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
performed by a
service agency or the gas supplier.
Thank you for buying this energy efficient water heater.
We appreciate your confidence in our products.
plaCe these instruCtions adjaCent to heater and notify owner to keep for future referenCe.
PRINTED 0613
CommerCial gas water heaters
and
service
must
qualified
installer,
be
instruction manual
models Btn 120 - 400(a)
low nox series 108
installation - operation - serViCe
- maintenanCe - limited warranty
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
318815-003

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Summary of Contents for A.O. Smith BTN-120

  • Page 1 instruction manual CommerCial gas water heaters models Btn 120 - 400(a) low nox series 108 installation - operation - serViCe - maintenanCe - limited warranty 500 Tennessee Waltz Parkway Ashland City, TN 37015 WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

  • Page 2: Table Of Contents

    taBle of Contents SAFe INSTAllATION, USe AND SerVICe.......... 3 Outdoor Air Through Two Horizontal Ducts ........16 GeNerAl SAFeTy INFOrMATION ............4 Outdoor Air Through Two Vertical Ducts .......... 17 Precautions ..................5 Air From Other Indoor Spaces ............17 Grounding Instructions ..............

  • Page 3: Safe Installation, Use And Service

    safe installation, use and serViCe The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard.

  • Page 4: General Safety Information

    general safety information Fire or Explosion Hazard Fire Hazard Do not store or use gasoline or other flammable vapors and For continued protection against liquids in the vicinity of this or any other appliance. risk of fire: Do not install water heater on Avoid all ignition sources if you smell gas.

  • Page 5: Precautions

    general safety information Read and understand this instruction Explosion Hazard manual and the safety messages herein before installing, operating or Overheated water can cause servicing this water heater. water tank explosion. Failure to follow these instructions and Properly sized temperature and safety messages could result in death pressure relief valve must be or serious injury.

  • Page 6: Introduction

    introduCtion Thank you for purchasing this water heater. Properly installed Particular attention should be given to the installation and maintained, it should give you years of trouble free service. of thermometers at the locations indicated in the piping diagrams as these are necessary for checking the aBBreViations used operation of the water heater.

  • Page 7: Features And Components

    features and Components the eliminator (self-Cleaning system) eleCtroniC ignition Control each heater is equipped with an ignition control. The solid state These units include The eliminator (Self-Cleaning System) ignition control (Figure 3), ignites the main burner by utilizing a installed in the front water inlet, See Figure 1. The eliminator inlet silicon nitride igniter.

  • Page 8: Installation Considerations

    CapaCities gas and eleCtriCal CharaCteristiCs outlet inlet 1 1/2” npt 1 1/2” npt top View figure 5. front View BaCk View taBle 1. rough-in-dimensions BTN-120 BTN-154 BTN-180 BTN-199C BTN-199 BTN-200 BTN-250 BTN-275 BTN-310 BTN-366 BTN-400 Model Dim.

  • Page 9: Locating The Water Heater

    ClearanCes to ComBustiBles in inChes (mm) periods of non-use. model “a” right side “B” left side “C” BaCk “d” Ceiling Btn-120 2” (51 mm) 2” (51 mm) 2” (51 mm) 12” (305 mm) Btn-154 2” (51 mm) 2” (51 mm) 2”...

  • Page 10: Installation On Combustible Flooring

    insulation Blanket Breathing Hazard - Carbon Monoxide Gas Do not obstruct water heater air intake with insulating blanket. Gas and carbon monoxide detectors are available. Install water heater in accordance with the instruction manual. Breathing carbon monoxide can cause brain damage or death.

  • Page 11: High Altitude Installations

    Some circulating pumps are manufactured with sealed bearings and do not require further lubrication. Some circulating pumps must be periodically oiled. refer to the pump manufacturer’s instructions for lubrication requirements. Breathing Hazard - Carbon Monoxide Gas CIRCULATING PUMP WIRING DIAGRAM CIRCULATING PUMP WIRING DIAGRAM Under no circumstances should DISHWASHER LOOP WITH TOGGLE SWITCH...

  • Page 12: Installation Requirements

    installation reQuirements 5. When installing multiple water heaters in the same gas supply gas supply system system it is recommended that individual positive lock-up gas low pressure building gas supply systems are defined as those pressure regulators be installed at each unit from the supply systems that cannot under any circumstances exceed 14”...

  • Page 13: Dishwashing Machines

    expansion. Contact a local plumbing service agency to have a thermal expansion tank installed. HOT WATER See Water line Connections on page 20 and the Water Piping OUTLET Diagrams beginning on page 35. 12” TO 15” temperature-pressure relief ValVe (30-38 cm) TEMPERED WATER OUTLET Explosion Hazard...

  • Page 14: Contaminated Air

    No valve or other obstruction is to be placed between the regarding the Temperature-Pressure relief Valve call the toll Temperature-Pressure relief Valve and the tank. Do not connect free number listed on the back cover of this manual for technical discharge piping directly to the drain unless a 6”...

  • Page 15: Unconfined Space

    Never obstruct the flow of ventilation air. If you have any doubts Openings must be installed to provide fresh air for combustion, or questions at all, call your gas supplier. Failure to provide the ventilation and dilution in confined spaces. The required size for proper amount of combustion air can result in a fire or explosion the openings is dependent on the method used to provide fresh and cause property damage, serious bodily injury or death.

  • Page 16: Multiple Heater Manifold

    multiple heater manifold outdoor air through one opening Figure 13 and tables on pages 18 and 19 should be used for horizontally manifolding two or more heaters. figure 15. Alternatively a single permanent opening, commencing within 12 inches (300 mm) of the top of the enclosure, shall be provided. figure 13.

  • Page 17: Outdoor Air Through Two Vertical Ducts

    outdoor air through two VertiCal duCts When ducts are used, they shall be of the same cross sectional area as the free area of the openings to which they connect. The illustrations shown in this section of the manual are a The minimum dimension of rectangular air ducts shall be not less reference for the openings that provide fresh air into confined than 3 inches.

  • Page 18: Technical Data Venting

    When venting multiple tank type heaters using Type B vent pipe, follow the installation diagram (figure 13) and tables below which give sizing and data based upon NFPA 54/ANSI Z223. 2006. model Btn-120 input: 120,000 Btu/hr total Vent height (feet) Vent Connector size: 5 inches...
  • Page 19 taBle 7. teChniCal data Venting (Continued) model Btn-250 input: 250,000 Btu/hr total Vent height (feet) Vent Connector size: 6 inches input Btuh/hr rise Vent Connector diameter (inches) 250,000 1 Ft 250,000 2 Ft 250,000 3 Ft number of 250 heaters Combined input (btu/hr) manifold and Common Vent diameter (inches) 500,000...

  • Page 20: Water Heater Installation

    water heater installation water line ConneCtions t&p ValVe disCharge pipe The water piping installation must conform to these instructions and to all local code authority having jurisdiction. Good practice requires that all heavy piping be supported. Explosion Hazard read and observe all requirements in the following sections before installation of the water piping begins: Temperature-Pressure Relief Valve 1.

  • Page 21: Installation Diagrams - Top Inlet/Outlet Usage

    installation diagrams - top inlet/outlet usage temperature setting should not exCeed safe use temperature at fixtures. see water temperature Use of the top inlet water connection requires an inlet dip tube Control and mixing ValVes on page 12. if higher (refer to figure 19).

  • Page 22: Heater Wiring

    heater wiring All electrical work must be installed in accordance with the latest version of the National electrical Code ANSI/NFPA No. 70 and must conform to all local code authority having jurisdiction. AN eleCTrICAl GrOUND IS reQUIreD TO reDUCe rISK OF eleCTrICAl SHOCK Or POSSIBle eleCTrOCUTION.

  • Page 23: Gas Piping

    gas piping gas meter size – natural gases only Be sure the gas meter has sufficient capacity to supply the full rated Contact your local gas service company to ensure that adequate gas input of the water heater as well as the requirements of all gas service is available and to review applicable installation codes other gas fired equipment supplied by the meter.

  • Page 24: Start Up

    start up prior to start up initial start up Installation and start up of this water heater requires abilities required test equipment and skills equivalent to that of a licensed tradesman in the field U-tube manometer, pressure gauge, or digital manometer. involved, see Qualifications on page 6.

  • Page 25: Checking Venting

    CheCking the input On multiple water heater installations the supply gas line regulators shall be adjusted to provide gas pressure to each water heater For installation locations with elevations above 2000 feet, refer within the minimum and maximum supply pressure requirements to HIGH AlTITUDe INSTAllATIONS section of this manual for listed in Table 3 on page 8 with all gas fired appliances connected input reduction procedure.

  • Page 26: Sequence Of Operation

    seQuenCe of operation The following information will describe the Sequence of Operation 10. From the time the Gas Valve opens, the Ignition Control Board waits 3 seconds and then shuts off power to the Silicon Nitride Igniter. for this water heater. 11.

  • Page 27: Sequence Of Operation Flow Chart

    seQuenCe of operation flow Chart Description of this flow chart can be found in the “SeQUeNCe OF OPerATION” section found on page 26. figure 24.

  • Page 28: Maintenance

    maintenanCe CheCk the igniter assemBly and main Burners If the storage tank temperature control is out of calibration, replace with new control. At least once a year, check the igniter assembly, Figure 25, and SHOUlD OVerHeATING OCCUr Or THe GAS SUPPly FAIl the main burner, Figure 26, for proper operation.

  • Page 29: Anode Rod Inspection

    draining and flushing explosion hazard Burn harzard. Temperature-Pressure Relief Valve Hot water discharge. must comply with ANSI Z21.22- CSA 4.4 and ASMe code. Keep hands clear of drain valve discharge. Properly sized temperature- pressure relief valve must be installed in opening provided. It is recommended that the water heater storage tank be drained Can result in overheating and and flushed every 6 months to reduce sediment buildup.

  • Page 30: Deliming Solvents

    lime accumulation not only reduces the life of equipment but also Observe handling instructions on label of product being used. reduces efficiency of the heater and increases fuel consumption. tank Cleanout proCedure The usage of water softening equipment greatly reduces the hardness The following practices will ensure longer life and enable the of the water.
  • Page 31 threads. Tighten firmly by hand and use wrench or adjustable pliers to check for secure connection. Do not over tighten to avoid damage to threads and fittings. Chemical Hazard Prepare the Up-N-Down Transfer Kit The next step is the preparation on the Up-N-Down Transfer Kit, •...

  • Page 32: Service

    serViCe The installer may be able to observe and correct certain problems TABle 11: which may arise when the unit is put into operation. HOWeVer, it is recommended that only qualified service agents, using 1 FlASH System lockout (retries or cycles exceeded) appropriate test equipment, be allowed to service the heater.

  • Page 33: For Your Information

    for your information start up Conditions A sulfate reducing bacteria which has accumulated within the water heater (this harmless bacteria is smoke/odor nontoxic to humans). An excess of active hydrogen in the tank. This is caused It is not uncommon to experience a small amount of smoke and by the corrosion protective action of the anode.

  • Page 34: Troubleshooting

    trouBleshooting remedy Complaint Cause user Qualified serViCe agenCy *Water not hot enough Thermostat set too low. Set thermostat dial to a higher temperature Upper and/or lower temperature Call qualified service agency Check continuity and resistance (Ohms) probe out of calibration. of upper and lower temperature probes.

  • Page 35: Water Piping Diagrams

    water piping diagrams...
  • Page 45 STORAGE TANK...
  • Page 48 STORAGE TANK...

  • Page 50: Manifold Kits

    MANIFOLD KITS manifold kits TWO UNIT MANIFOLD KIT (PART NO. 9003426205) MODEL DIMENSION "A" BTN-120 63" BTN-154 68" BTN-180 72" BTN-199C 72" BTN-199 72" BTN-200/A 72" BTN-250/A 72" BTN-275/A 72" THREE UNIT MANIFOLD KIT BTN-310/A 73" (PART NO. 9003427205) BTN-366/A 73"...

  • Page 51: Warranty

    warranty...
  • Page 52 www.hotwater.com 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Tech Support: 800-527-1953 Parts: 800-433-2545 Copyright © 2013 A. O. Smith Water Heater Company, All rights reserved.

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