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Service Handbook
MODEL BTF-75
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER
•
SAFETY
•
INSTALLATION
Thank you for buying this energy efficient water heater from A.O. Smith
Water Products Company. We appreciate your confidence in our
products.
® SmartValve is a Registered Trademark of Honeywell Inc.
KEEP THIS MANUAL IN THE POCKET ON THE HEATER FOR FUTURE REFERENCE
PRINTED IN U.S.A. 0901
•
OPERATION
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
with Hot Surface Ignition & SmartValve
•
MAINTENANCE
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
1
•
LIMITED WARRANTY
CAUTION
McBee, South Carolina U.S.A.
Stratford, Ontario Canada
www.hotwater.com
PART NO. 194643-000
®
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Table of Contents
Troubleshooting
Related Manuals for A.O. Smith BTF-75
Summary of Contents for A.O. Smith BTF-75
- Page 1 • SAFETY • INSTALLATION Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. ® SmartValve is a Registered Trademark of Honeywell Inc. KEEP THIS MANUAL IN THE POCKET ON THE HEATER FOR FUTURE REFERENCE WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
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Page 2: Rough-In Dimensions
23.4 Recovery capacity based on 80% thermal efficiency. FOREWORD The design of model BTF-75 complies with the latest version of ANSI Z21.10.3/CSA 4.3 M98 as automatic storage or automatic circulating tank type water heaters. Installation diagrams are found in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping necessary. -
Page 3: Table Of Contents
TABLE OF CONTENTS ROUGH-IN DIMENSIONS ... 2 FOREWORD ... 2 GENERAL SAFETY INFORMATION Precautions ... 3 Chemical Vapor Corrosion ... 3 Improper Combustion ... 3 Liquid Petroleum Models ... 3-4 Extended Non-Use periods ... 4 Insulation Blankets ... 4 Circulating Pump ... 4 Dishwashing Machine Requirements ... -
Page 4: Extended Non-Use Periods
INSULATION BLANKETS Insulation blankets available to the general public for external use on gas water heaters are not necessary with A.O. Smith products. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank heaters. Your A.O. Smith water heater... -
Page 5: Air Requirements
The heater is design certified by the Canadian Standards for installation on combustible flooring in a closet having minimum clearances from combustible material of: 2" clearance from sides and rear, 6" from the front and 24" from the top. (Standard clearance.) If clearances stated on the heater differ from standard clearances, install water heater according to clearances stated on heater. -
Page 6: Closed Water System
SINGLE TEMPERATURE MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER CLOSED WATER SYSTEM A closed system will exist if a back-flow preventer (check valve), pressure reducing valve, or other similar device is installed in the cold water line between the water heater and the street main (or well). Excessive pressure may develop due to the thermal expansion of heated water causing premature tank failure or intermittent relief valve operation. -
Page 7: Location Of Heater
WARNING VENT HOOD(S) MAY BE EXTREMELY HOT DURING OPERATION. 5. The vent termination shall not be mounted directly above or within 3 feet horizontally from an oil tank vent or gas meter to avoid potential freeze-up from condensation. Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. -
Page 8: Vent Terminal Installation, Sidewall
PVC Materials should use ASTM D-2564 Grade Cement; CPVC Materials should use ASTM F-493 Grade Cement and ABS Materials should use ASTM D-2235 Grade Cement. NOTE: 1. For water heaters in locations with high ambient temperatures (above 100°F) and/or insufficient dilution air, it is recommended that CPVC or ABS pipe and fittings be used. - Page 9 Remove two screws that secure side plate on control box and remove plate. Cut flexible power cord on inside of control box, as close to inside wall as possible. If flexible cord and strain relief are removed, then opening in box must be covered. Remove plastic cap in top of control box and install suitable conduit fitting in enclosure.
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Page 10: Installation Of Vent System, Sidewall
INSTALLATION OF VENT SYSTEM, SIDEWALL With the route of the venting system and selection of materials completed, as discussed in section of this manual titled PLANNING THE VENT SYSTEM, the through the wall vent terminal in place and the first section of piping, up to first elbow, installed at the blower it is time to complete the installation of the venting system for the sidewall installation. - Page 11 • Rag - Cotton (Not Synthetic) • Primer and Cleaner • Solvent Cement - PVC for PVC Components and CPVC for CPVC Components • Containers - Metal or Glass to hold Primer and Cement. Select the type of PVC or CPVC materials to be used on the basis of their application with respect to chemical resistance, pressure rating, temperature characteristics,etc.
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Page 12: Gas Connections
G. Cleanup and joint movement Remove all excess cement from around the pipe and fitting with a dry cotton rag. This must be done while the cement is still soft. The joint should not be disturbed immediately after the cementing procedure, and sufficient time should be allowed for proper curing of the joint. -
Page 13: For Your Safety Read Before Operating
FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or 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. -
Page 14: Purging
NOT AVAILABLE, A COVER SHOULD BE INSTALLED OVER THE THERMOSTAT TO PREVENT TAMPERING. Suitable covers are available through A.O. Smith Water Products Company, 5621 W. 115th Street, Alsip, IL 60803. It is recommended that lower water temperatures be used to avoid the risk of scalding. -
Page 15: High Temperature Cut-Off Switch
Repeat step C above. FIGURE 11 POWER VENTER MAINTENANCE The BTF-75 must be inspected quarterly. Points of inspection are: 1. MOTOR - Motor must rotate freely. This is a sealed motor and no oiling is required. 2. WHEEL - Wheel must be clean of soot, ash or any other coating which inhibits either rotation or air flow. -
Page 16: Main Burner And Igniter
Do not attempt to repair the water heater yourself. Any work performed by unauthorized personnel may void the warranty. If you are having a problem with your A.O. Smith water heater and are not pleased with the service you received: •... - Page 17 Replace harness. Replace igniter. Reset cycle by turning switch off and then back on. If unit does not light in three trials, call an authorized A.O. Smith service representative. Verify dilution air openings are free of obstructions. Make sure there is no more than 30 equivalent feet of 3 inch pipe or 85 equivalent feet of 4 inch pipe.
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Page 18: Troubleshooting With The Led
TROUBLESHOOTING WITH THE LED LED STATUS No power to system control. Normal Operation BRITE - DM This indication shows whenever the system is powered, unless some abnormal event has occurred. 1 FLASH Setpoint error, internal failure detected. Airflow proving switch remains open longer than 30 seconds after a call for heat begins. -
Page 19: Trouble Shooting
SV9560/SV9570 SMARTVALVE START CHECK FOR PROPER VOLTAGE AT CONTROL HARNESS (SEE INSET A). VOLTAGE SHOULD BE 120V BETWEEN 120V COMMON AND 120V HOT. TURN ON GAS SUPPLY PLUG HARNESS INTO SmartValve ® CONTROL. INITIATE A REQUEST FOR HEAT. COMBUSTION BLOWER SHOULD BE ON AND PREPURGED. -
Page 20: Limited Warranty
Model BTF-75 Limited Warranty A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 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 therein, during the first THREE years after initial installation, the warrantor will supply a complete new A.
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