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MODELS BTP-140-140 thru 600-2500
INCLUDING BTPD/BTPN/COF & COBT
COMMERCIAL GAS, OIL AND GAS/OIL TANK-TYPE WATER HEATERS
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
®
CONSERVATIONIST
ASME
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY.
PLEASE READ THOUROUGHLY BEFORE USING
APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
RENTON, WASHINGTON
www.hotwater.com
WARNING – PROPANE MODEL
Water heaters for propane gas are different from natu
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FOREWORD This manual is intended to be used in conjunction with other ARRANGEMENT REQUIREMENTS AND SERVICE literature provided with the heater. This includes power burner RECOMMENDATIONS. and related gas control information. It is important that this manual and the additional publications be reviewed in their entirety before In the absence of local codes, the installation must comply with beginning any work. the instruction as outlined in the latest publication of ANSI booklet NFPA-54/ANSI Z22
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The venting of the water heater should be inspected by a qualified GENERAL SAFETY service technician at the time of installation and periodically thereafter to ensure a down-draft condition does not exist. INFORMATION DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND PRECAUTIONS VENTILATION MUST BE PROVIDED FOR SAFE OPERATION. DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDERWATER. Immediately call a qualified service technician LIQUID PETROLEUM MOD
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Note: Some gas utility companies derate the heating value of the The water temperature is controlled by two thermostats. One supplied gas at high elevations. Your authorized A.O. Smith Start- thermostat is located near the top of the tank and the other is in Up Agent must adjust for actual heating valve of the gas at the the lower part of the tank. The upper thermostat must be set at time of start-up. least 5°F higher than the lower thermostat. In the case where the water heater has electro
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The latest version of the National Electrical Code, NFPA No. A clearance of 24” should be maintained from serviceable parts, 70. In Canada refer to Canadian Electrical Code C 22.1, from such as relief valve, power burner, thermostat and drain valve. National Fire Protection Association, 1 Batterymarch Park, MINIMUM INSTALLATION CLEARANCES Quicy, MA 02269-9101. BTP/BTPN/BTPD COF/COBT LOCATING THE HEATER FRONT - 18 Inches FRONT - 18 Inches BACK - 0 Inches Back - 6 Inches When installing the heate
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UNDESIRABLE OPENINGS, CAUSING POOR COMBUSTION. VENT CONNECTOR SOOTING MAY RESULT WITH AN INCREASED RISK OF ASPHYXIATION. The chimney vent connector diameter should be the same size as the heater flue outlet, see table 1. A minimum rise of 1/4” per THERMAL EXPANSION (CLOSED SYSTEM) foot of horizontal connector length must be maintained between the heater and chimney opening, fig. 2. The connector length Thermal expansion occurs in any hot water system when system should be kept as short as pos
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TABLE 2 CAPACITY OF PIPE - NATURAL GAS IN CUBIC FEET PER HOUR Maximum Based Upon Pressure Drop of 0.3” w.c. and Specific Gravity CORRECTION FACTORS of 0.60 and Maximum Gas Pressure of .5 psig. Specific Gravity Pressure Drop Pipe Length Pipe Size - Inches (IPS) Other than 0.60 Other than 0.3 In Feet 1 1 1/4 1 1/2 2 2 1/2 3 4 Specific Multplier Pressure Multiplier 10 520 1050 1600 3050 4800 8500 17500 Gravity Drop 20 350 730 1100 2100 3300 5900 12000 0.50 1.10 0.1 0.577 30
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TABLE 3 PURGING EQUIVALENT LENGTH OF FITTINGS IN FEET Gas line purging is required with new piping or systems in which Pipe Size (IPS) 1 1.25 1.5 2 2.5 3 4 air has entered. 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 CAUTION Plug Cock 3.0 4.0 5.5 7.5 9.0 12.0 16.0 PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED IN THIS TYPE GAS SERVICE. TO AVOID RISK OF FIRE OR EXPLOSION, PURGE DISCHARGE MUST NOT WARNING
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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 9
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TYPICAL WIRE DIAGRAM COBT, 140 - 300 KBTUH TYPICAL WIRE DIAGRAM COF, 140 - 720 KBTUH 10
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OF ELECTRICAL SHOCK. DO NOT ENERGIZE THE BRANCH The Authorized Start-Up Agent will when they come out to start- CIRCUIT BEFORE THE HEATER TANK IS FILLED WITH up the unit(s) complete one of the following forms for each unit WATER. you have and submit it to A.O. Smith Water Products Company to activate your warranty: Start-Up Covering Models TWO UNIT MANIFOLD Form No. 09063511 BTP Models, 140 - 255 kBTUH INSTALLATION 09063510 BTP Models, 270 - 2500 kBTUH 09063512 COBT Models, 140 - 2500 kBTUH 0906
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3. The correct test instruments are: MAINTENANCE SCHEDULE Component Operation Interval Required •CO indicator or 0 analyzer 2 2 Flushing Monthly Sediment • CO indicator Tank Removal Semi-Annually ® Lime Scale UN•LIME • Stack thermometer Removal As Required Delimer Relief Valve Inspect Semi-Annually • Draft gauge or inclined manometer Power Burner SAE No. 20 Motor(1) Inspect Quarterly non-detergent • U-tube manometer or calibrated 0-10” and 0-35” w.c. motor oil pressure gauge Power Burner Combust
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Lime accumulation not only reduces the life of the equipment but A. O. Smith Form no. 4800, entitled, “Why, When and How”, also reduces efficiency of the heater and increases fuel describes tank cleaning methods and materials. UN•LIME and consumption. the booklet may be obtained through your A. O. Smith dealer or distributor. To clean heater through cleanout opening, proceed as follows: 1. Turn off water inlet valve, the heater electrical disconnect switch and open drain valve. 2. Remove outer
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BURNER AIR OPENINGS OR VENTILATION GRILLES FOR To test gate for operation, gently tap gate and observe. DO NOT COMBUSTION AIR. REMOVE LINT ACCUMULATION FROM OIL. AIR INTAKE GRILL. The red solid fuel tabs supplied with the draft regulator must be removed (See instructions supplied with Draft Regulator). At least annually, contact a qualified service agency for burner cleaning and other routine maintenance. CLEANING FLUES-COF & COBT ONLY TROUBLESHOOTING The following describes how to gain access
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WATER HEATER MAKES NOISE When such a condition is encountered, local codes or inspection agency should be consulted to determine which 1. Sediment or lime scale accumulations cause noises when the system is acceptable in your area. These may consist of: heater is operating. • Installation of a second relief valve with lower setting than • The sounds are normal, however, the tank bottom should the primary relief valve. be cleaned. Refer to MAINTENANCE for details. 2. Some of the electrical comp
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Model BTP/BTPD/BTPN/COF/COBT Limited Warranty 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 TANK If the glass lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water the
