A.O. Smith FPSH - 75 Owner's Manual

270 series with hot surface ignition

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Service handbook (50 pages)

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Page 1 RESIDENTIAL Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. You should thoroughly read this manual before installation and/ or operation of this water heater. Please pay particular attention to the important safety and operating instructions as well as the WARNING and CAUTIONS.
Page 2: Get To Know Your Water Heater
GET TO KNOW YOUR WATER HEATER REPLACEMENT PARTS AND DELIMING PRODUCTS Replacement parts and recommended delimer may be ordered through authorized servicers or distributors. Refer to the Yellow Pages for your A. O. Smith plumber or contact the A. O. Smith Water Products Company, 5621 W.
Page 3: General Safety Information
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.
Page 4: Installation
• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • Do obtain new warning and instruction labels from A.O. Smith for placement on the blanket directly over the existing labels.
Page 5 CONFINED SPACE When drawing combustion and dilution air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings. ONE WITHIN 12 INCHES OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of one square inch per 1000 Btuh of the total input of all appliances in the enclosure, but not less than 100 square inches.
Page 6: Connection Of Gas Pipe
WARNING VENT HOOD(S) MAY BE EXTREMELY HOT DURING OPERATION. REFER TO FIG. 1 FOR CONNECTION DETAILS. BEFORE ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE. TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG) MUST BE INCORPORATED IN THE PIPING, FIG.
Page 7: Vent Pipe Termination
BETWEEN THE RELIEF VALVE AND TANK. DO NOT PLUG THE RELIEF VALVE. The drain line connected to this valve must not contain a reducing coupling or other restriction and must terminate near a suitable drain to prevent water damage during valve operation. The discharge line shall be installed in a manner to allow complete drainage of both the valve and line.
Page 8: Installation Of Vent System
NOTE: This unit can be vented using only PVC (Class 160, ASTM D-2241; Schedule 40, ASTM D-1785; or Cellular Core Schedule 40 DWV, ASTM F-891), Schedule 40 CPVC/ASTM F-441), or ABS/ASTM D-2661) pipe. The fittings, other than the TERMINATION TEE should be equivalent to PVC-DWV fittings meeting ASTM D-2665 (Use CPVC fittings, ASTM F- 438 for CPVC pipe and ABS fittings, ASTM D-2661/3311 for ABS pipe.
Page 9 3. Make sure that plastic tubing is still attached to the pressure switch and fan housing. Also make sure that wiring connector from motor to control box is securely attached. 4. Do not plug in power cord until vent system is completely installed.
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: Selection Of Materials
2. SELECTION OF MATERIALS • Cutting Device - Saw or Pipe Cutter • Deburring Tool, Knife, File, or Beveling Machine (2" and above) • Brush - Pure Bristle • Rag - Cotton (Not Synthetic) • Primer and Cleaner • Solvent Cement - PVC for PVC Components and CPVC for CPVC Components •...
Page 12: Operation
STEP E NOTE: Cans of cement and primer should be closed at all times when not in use to prevent evaporation of chemicals and hardening of cement. They are also very flammable and should be kept away from heat or flame. F.
Page 13: For Your Safety Read Before Operating
FOR YOUR SAFETY READ BEFORE OPERATING 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 does not have a pilot. It is equipped with an ignition device which automatically lights the burner.
Page 14: Maintenance
A SUITABLE AREA IS 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 SERVICE SHOULD BE PERFORMED ONLY BY A QUALIFIED SERVICE TECHNICIAN. READ THE GENERAL SAFETY INFORMATION SECTION FIRST. USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE INSPECTED FOR PROPER OPERATION PERIODICALLY BY A QUALIFIED SERVICE TECHNICIAN.
Page 16: Troubleshooting
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: • First, please contact your dealer or the A.O. Smith authorized service agent in your area and explain to them why you are not satisfied.
Page 17: Troubleshooting
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.
Page 18: Troubleshooting Guide
Water heater may exhibit problems that are unrelated to a malfunction of the water heater itself. The following information and tables may serve to answer your question about a problem that you are having without having to call a service agent. WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE.
Page 19: Limited Residential Gas Warranty
LIMITED RESIDENTIAL GAS WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY. If the glass lined tank in this water heater shall prove upon examination by A. O. Smith Corporation (the warrantor) to have leaked during the warranty period in normal residential use, due to natural corrosion from potable water therein, the warrantor will furnish the ORIGINAL OWNER a replacement A.
Page 20 A.O. SMITH WATER PRODUCTS CO., INC. 5621 W. 115TH STREET • ALSIP, ILLINOIS 60803 PHONE: 1-800-433-2545 • FAX: 1-800-433-2515 www.hotwater.com • E-MAIL: parts@hotwater.com...

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A.O. Smith FPSH - 75 Owner's Manual

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