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A.O. Smith BTP-140-140 thru 600-2500 manual

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Table of contents for the manual

  • Page 1

    1 W ARNING – PROP ANE MODEL W ater 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 explosive and heavier than air . It collects fir[...]

  • Page 2

    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 installation should be made in accordance with the[...]

  • Page 3

    3 GENERAL SAFETY INFORMA TION PRECAUTIONS DO NOT USE THIS APPLIANCE IF ANY P ART HAS BEEN UNDERW A TER. 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 OPERA TE HEA TER UNTIL ALL CO[...]

  • Page 4

    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 thermosta t s, this differential has been factory set and cann[...]

  • Page 5

    5 The latest version of the National Electrical Code, NFP A No. 70. In Canada refer to Canadian Electrical Code C 22.1, from National Fire Protection Association, 1 Batterymarch Park, Quicy , MA 02269-9101. LOCA TING THE HEA TER When inst alling the heater, consideration must be given to proper location. Location selected should be as close to the [...]

  • Page 6

    6 UNDESIRABLE OPENINGS, CAUSING POOR COMBUSTION. SOOTING MA Y RESUL T WITH AN INCREASED RISK OF ASPHYXIA TION. THERMAL EXP ANSION (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” condition such as being connected dire[...]

  • 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. V ent piping making horizontal runs must have a minimum upward slope toward[...]

  • Page 8

    8 T ABLE 3 EQUIV ALENT LENGTH OF FITTINGS IN FEET Pipe Size (IPS) 1 1.25 1.5 2 2. 5 3 4 S td. T ee through side 5.5 7.5 9 .0 12.0 14.0 17.0 22.0 S td. E1 1 2.7 3 .7 4.3 5.5 6.5 8.0 12.0 45°F E1 1 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 W ARNING THE HEA TER IS NOT INTENDED FOR OPERA TION A T HIGHER THAN 13.8” W A TER C[...]

  • 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

    11 OF ELECTRICAL SHOCK. DO NOT ENERGIZE THE BRANCH CIRCUIT BEFORE THE HEA TER T ANK IS FILLED WITH W A TER. TWO UNIT MANIFOLD INST ALLA TION 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 with the higher water flow may have a shortened[...]

  • Page 12

    12 3. The correct test instruments are: •C O 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 heater is operating, turn valve, mai[...]

  • 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 this reason it is recommended that a regular sche[...]

  • Page 14

    14 BURNER AIR OPENINGS OR VENTILA TION GRILLES FOR COMBUSTION AIR. REMOVE LINT ACCUMULA TION FROM AIR INT AKE GRILL. At least annually , contact a qualified service agency for burner cleaning and other routine maintenance. CLEANING FLUES-COF & COBT ONL Y The following describes how to gain access to the tank flues for cleaning if necessary . 1.[...]

  • Page 15

    15 W A TER HEA TER 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. • Contacts click or snap as the heater s[...]

  • Page 16

    16 CERTIFIED F ACTOR Y ST ART - UP REQUIRED T o activate your warranty , contact your local sales represent ative or Authorized S tart-up Agent to arrange for a FREE Certified S tart-up. A.O. Smith Corporation, the warrantor, extends the following LIMITED W ARRANTY to the owner of this water heater. 1. THE T ANK If the glass lined tank in this wate[...]