Instruction/ maintenance manual of the product COBT A.O. Smith
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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.
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.
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 .
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.
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.
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.
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.
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.
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.
10 TYPICAL WIRE DIAGRAM COF , 140 - 720 KBTUH TYPICAL WIRE DIAGRAM COBT , 140 - 300 KBTUH.
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.
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 .
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).
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 .
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.
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.
An important point after buying a device A.O. Smith COBT (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought A.O. Smith COBT yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data A.O. Smith COBT - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith COBT you will learn all the available features of the product, as well as information on its operation. The information that you get A.O. Smith COBT will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith COBT, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime A.O. Smith COBT.
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith COBT. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith COBT along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
