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  4. BTP-140
  5. Installation And Operation Manual

A.O. Smith BTP-140 Installation And Operation Manual

Manual is about: A.O.Smith GAS WATER HEATERS BTP-140-140, thru 600-2500 BTPD, BTPN, COF, COBT

Summary of BTP-140

  • Page 1

    1 warning – propane model water heaters for propane gas are different from natural gas models. A natural gas heater will not function safely on propane gas and no attempt should be made to convert a heater from natural gas to propane gas. Propane gas must be used with great caution. It is highly exp...

  • Page 2: Foreword

    2 foreword this manual is intended to be used in conjunction with other literature provided with the heater. This includes power burner and related gas control information. It is important that this manual and the additional publications be reviewed in their entirety before beginning any work. The i...

  • Page 3: General Safety

    3 general safety information precautions do not use this appliance if any part has been underwater. 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 fol...

  • Page 4: Installation Instructions

    4 the water temperature is controlled by two thermostats. One thermostat is located near the top of the tank and the other is in the lower part of the tank. The upper thermostat must be set at least 5°f higher than the lower thermostat. In the case where the water heater has electronic thermostats, ...

  • Page 5

    5 the latest version of the national electrical code, nfpa no. 70. In canada refer to canadian electrical code c 22.1, from national fire protection association, 1 batterymarch park, quicy, ma 02269-9101. Locating the heater when installing the heater, consideration must be given to proper location....

  • Page 6

    6 undesirable openings, causing poor combustion. Sooting may result with an increased risk of asphyxiation. Thermal expansion (closed system) thermal expansion occurs in any hot water system when system water is heated or “recovered” during periods of non-use. If the system is operated in an “open” ...

  • Page 7

    7 where an existing chimney or vent is to be used, be sure that the chimney or vent has adequate capacity for the number and sizes of gas appliances being vented through it. Inspect the chimney or vent and remove all soot or other obstructions, which will retard free draft. Vent piping making horizo...

  • Page 8

    8 table 3 equivalent length of fittings in feet pipe size (ips) 1 1.25 1.5 2 2.5 3 4 std. Tee through side 5.5 7.5 9.0 12.0 14.0 17.0 22.0 std. E11 2.7 3.7 4.3 5.5 6.5 8.0 12.0 45°f e11 1.2 1.6 2.0 2.5 3.0 3.7 5.0 plug cock 3.0 4.0 5.5 7.5 9.0 12.0 16.0 warning the heater is not intended for operati...

  • Page 9

    9 typical wire diagram btp, 270 - 2,500 kbtuh cof, 800 - 2,500 kbtuh cobt, 400 - 2,500 kbtuh typical wire diagram btp, 140 - 255 kbtuh.

  • Page 10

    10 typical wire diagram cof, 140 - 720 kbtuh typical wire diagram cobt, 140 - 300 kbtuh.

  • Page 11: Two Unit Manifold

    11 of electrical shock. Do not energize the branch circuit before the heater tank is filled with water. Two unit manifold installation assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Otherwise, the units wit...

  • Page 12: Maintenance

    12 3. The correct test instruments are: • co 2 indicator or 0 2 analyzer • co indicator • stack thermometer • draft gauge or inclined manometer • u-tube manometer or calibrated 0-10” and 0-35” w.C. Pressure gauge • combination volt/ammeter. Suggested safety device test procedures are: a. While heate...

  • Page 13

    13 lime accumulation not only reduces the life of the equipment but also reduces efficiency of the heater and increases fuel consumption. The usage of water softening equipment greatly reduces the hardness of the water. However, this equipment does not always remove all of the hardness (lime). For t...

  • Page 14: Troubleshooting

    14 burner air openings or ventilation grilles for combustion air. Remove lint accumulation from air intake grill. At least annually, contact a qualified service agency for burner cleaning and other routine maintenance. Cleaning flues-cof & cobt only the following describes how to gain access to the ...

  • Page 15

    15 water heater makes noise 1. Sediment or lime scale accumulations cause noises when the heater is operating. • the sounds are normal, however, the tank bottom should be cleaned. Refer to maintenance for details. 2. Some of the electrical components of the water heater make sounds, which are normal...

  • Page 16

    16 certified factory start - up required to activate your warranty, contact your local sales representative or authorized start-up agent to arrange for a free certified start-up. A.O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this water heater. 1. The t...