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MODELS BTP(V)-540A, 650A AND 740A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE LOW NOx
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
CONSERV V V V V A A A A A TIONIST
CONSER
CONSER
CONSER
CONSER
PRINTED IN U.S.A. 1004
WATER HEATER
TIONIST
TIONIST
TIONIST
TIONIST
® ® ® ® ®
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
TEXT PRINTED OR OUTLINED IN RED CONTAINS IN-
FORMATION RELATIVE TO YOUR SAFETY. PLEASE
READ THOROUGHLY BEFORE INSTALLING AND USING
THIS APPLIANCE.
A DIVISION OF A.O.SMITH CORPORATION
MCBEE, SOUTH CAROLINA
www.aosmithwaterheaters.com
1
CAUTION
PART NO. 195033-000
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Table of Contents
Related Manuals for A.O. Smith 650A, 740A
Summary of Contents for A.O. Smith 650A, 740A
- Page 1 MODELS BTP(V)-540A, 650A AND 740A COMMERCIAL GAS, GLASS-LINED, TANK-TYPE LOW NOx • INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY CONSER CONSER CONSERV V V V V A A A A A TIONIST CONSER CONSER PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND PRINTED IN U.S.A.
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Page 2: Rough-In-Dimensions
ROUGH-IN DIMENSIONS STANDARD BAROMETRIC DRAFT CONTROL BTP MODELS ALL DIMENSIONS IN INCHES (MILLIMETERS) Models 80 3/4 BTP(V)-540A 2,051 1,854 80 3/4 BTP(V)-650A 2,051 1,854 80 3/4 BTP(V)-740A 2,051 1,854 *Minimum gas supply pipe is 1 1/4”, reference Table 7 for gas supply pipe size. Storage Capacity Models... -
Page 3: Table Of Contents
In addition to these instructions, the equipment shall be installed in accordance with those installation regulations in accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. -
Page 4: Improper Combustion
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH. HIGH ALTITUDE INSTALLATIONS Your A.O. Smith water heater has been designed to operate at altitudes below 2000 Ft. (609.6 m), for appliance installation locations with elevations above 2000 Ft. (609.6 m), special considerations need to be taken. -
Page 5: Dishwashing Machine Requirement
Continued manual resetting of high limit control, preceded by higher than usual water temperature is evidence of high limit switch operation. The following are possible reasons for high limit switch operation. • A malfunction in the thermostatic controls would allow the gas valve to remain open causing water temperature to exceed the thermostat setting. -
Page 6: Hard Water
Units, which are to be installed on combustible flooring, must be supported by a full layer of hollow concrete blocks, from 8” (203.2 mm) to 12” (304.8 mm) thick and extending 12” (304.8 mm) minimum beyond the heater in all directions. The concrete blocks must provide an unbroken concrete surface under the heater with the hollows running continuously and horizontally. -
Page 7: Venting
Heater must be protected from freezing downdrafts during shutdown periods. The BTP 540A, 650A and 750A water heater are classified as a category I appliance (non-positive vent pressure, non- condensing) when installed with the supplied barometric draft control assembly in a vertical vent installation. The BTPV 540A through 740A heater is classified as a category III appliance (positive vent pressure, non-condensing) when installed with supplied sidewall vent kits or direct vent kit. - Page 8 FIGURE 5 Use only the sidewall vent terminal supplied with the heater. These terminals are specifically listed for use on these A.O. Smith heaters. VENT TERMINAL LOCATIONS-EXHAUST When considering location for sidewall vent terminals refer to the latest edition of the National Fuel Gas Code which recommends that vent terminals: 1.
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Page 9: Direct Venting - For Btpv Models
DIRECT VENTING - FOR BTPV MODELS All exhaust vent terminal, flue reducer, and intake vent terminal are supplied with any unit intended for direct venting. These parts must be installed without alteration. This heater is category III appliance when used in a direct vent application. - Page 10 1. Shall be located not less than 12” (304.8 mm) above grade. 2. Shall be located not less than 3 (.9144 m) feet horizontally from and not less than 3 feet (.9144 m) below an exhaust vent terminal. 3. Shall not be located directly above an exhaust terminal. 4.
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Page 11: Gas Piping
Attach a properly sized length of Selkirk Metalbestos model PS or model G venting to the exhaust vent adapter using the inner vee bands, see Figures 7 and 7B on page 10. Fill the grooves in both inner vee bands with high-temp silicone sealant, Dow Corning 736 or equivalent. -
Page 12: Gas Meter Size
TABLE 9A MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR (Based upon a Pressure Drop of 0.5 inch Water Column and 0.5 Specific Gravity Gas and max. gas press. of .5 psig) LENGTH Nominal Iron Pipe Sizes, Millimeters METERS 1/2"... -
Page 13: Water Line Connections
ROBERTSHAW ® 7000 DERHC GAS CONTROL VALVE FIGURE 10. WATER LINE CONNECTIONS Following are detailed installation diagrams for typical methods of application for the water heaters. The water heater may be installed by itself, or with a separate storage tank, on both single and two-temperature systems. When used with a separate storage tank, the circulation may be either by gravity or by means of a circulating pump. -
Page 14: Installation Diagrams
ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION NOTE: WHEN USING AN A.O. SMITH T-140, 200, 350 OR 400 STORAGE TANK, USE LOWER 3/4” OPENING FOR TANK TEMP. CONTROL ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK... - Page 15 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION WIRING DIAGRAM FOR TEMPERED WATER LOOP (IF USED) CIRCULATING PUMP WIRING DIAGRAM TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION *PIPE RELIEF VALVE TO OPEN DRAIN NOTE: IF TEMPERED WATER...
- Page 16 TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER) WITH OR WITHOUT BUILDING RECIRCULATION CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE, PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED.
- Page 17 TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 23. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
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Page 18: Manifold Kits
TWO UNIT MANIFOLD KIT MANIFOLD KITS PART NO. 195702 Precision cut type “L” all copper A. O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. -
Page 19: Heater Wiring
Start-up and Operation of this unit by other than an Authorized BTP Start-Up Agent will void the warranty. If you have not already done so, contact your local A.O. Smith Sales Representative or Authorized BTP Start-Up Agent and set-up a date for the start-up service. -
Page 20: Wiring Diagram
FIGURE 11. - Page 21 FIGURE 12.
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Page 22: Lighting And Operating Label
FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: explosion may result causing property damage, personal injury or loss of life. BEFORE OPERATING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES. A. This appliance is equipped with an ignition device which automatically lights the burner. -
Page 23: Sequence Of Operation
SEQUENCE OF OPERATION – Power on. – Heater in standby mode. – Thermostat calls for heat. – Blower motor starts. – Blower operation closes the normally open blower prover/ blocked outlet safety pressure switch. – On proof of airflow, Honeywell S8680J flame control module energized. -
Page 24: Adjustment Procedure For Fire-Rate, Low Nox And High Elevation (Fine-Tune)
Table 10 for proper settings. WARNING Never set air damper outside of its adjustment range of the rated fire rate unless authorized by an A.O. Smith Service Center. Important Note: Final gas and air settings should be based on... - Page 25 PREMIX LOW NOx BURNER - EXPLODED VIEW FOR BTP MODELS FIGURE 13.
- Page 26 PREMIX LOW NOx BURNER - EXPLODED VIEW FOR BTPV MODELS FIGURE 14.
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Page 27: General Information
GENERAL INFORMATION POWER BURNER The initial start-up procedure of the gas power burner is provided on page 18 thru 21. Refer to Figure 12, burner exploded view for burner components location. The sequence of operation of the power burner is provided on page 15. -
Page 28: Draining
A.O. Smith Form No. 4800 entitled “Why, When and How”, describes tank cleaning methods and materials. UN•LIME the booklet may be obtained through your A.O. Smith dealer or distributor. The cleanout opening is shown in Figure 9. -
Page 29: Circulating Pump
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION AND CAN CREATE A HAZARDOUS SITUATION. CIRCULATING PUMP The water heating system may include a circulating pump. Where used, it should be lubricated as directed by the circulator manufacturer. -
Page 30: Troubleshooting
THE POWER BURNER’S OPERATING SEQUENCE AND IGNITION SAFETY. IF YOU DO NOT HAVE THE PROPER TEST EQUIPMENT, I.E. A VOLT-OHM METER AND A MICRO-AMMETER DO NOT ATTEMPT TO TROUBLESHOOT OR REPAIR A.O. SMITH EQUIPMENT. ALTERING THE IGNITION MODULE AND/OR CONTROL BOX... - Page 31 Call the A.O. Smith Technical Center before you reset the switch. • If there’s 24V at “NO” terminal of the air switch, check for 24V at the air intake pressure switch connectors, (this switch is only supplied for direct vent systems).
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Page 32: Replacement Parts
Replacement parts may be ordered through A. O. Smith dealers, unauthorized servicers or distributors. Refer to the Yellow Pages for where to call or contact the A.O. Smith Water Products Company, 5621 W. 115th Street, Alsip, IL 60803, 1-800-433-2545 or visit our website at www.aosmithwaterheaters.com When ordering parts be sure... -
Page 33: Warranty
Some government agencies are requiring energy efficient standards for water heaters. In the event regulations prohibit sale of a model of equivalent size and construction, A.O. Smith will provide a model which complies with the regulations of your area, in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required. -
Page 34: Notes
NOTES... - Page 35 NOTES...
- Page 36 REPLACEMENT PARTS 5621 W. 115TH STREET, ALSIP, IL 60803 Phone: 800-433-2545 Fax: 800-433-2515 www.aosmithwaterheaters.com E-Mail: parts@hotwater.com...