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GAS WATER HEATER
RESIDENTIAL
OWNER'S MANUAL
GPDH/GPDT/GPDX
GAS MODELS
Thank you for buying this energy efficient water heater from
with
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
Hot Surface Ignition
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
WARNINGS and CAUTIONS.
TABLE OF CONTENTS
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GET TO KNOW YOUR WATER HEATER L UNION A VENT PIPE-EXHAUST M INLET WATER SHUT REPLACEMENT PARTS AND DELIMING PRODUCTS B ANODE OFF VALVE C HOT WATER OUTLET Replacement parts and recommended delimer may be N COLD WATER INLET D OUTLET (115 V. AC) ordered through authorized servicers or distributors. Refer to O INLET DIP TUBE E FLUE BAFFLE the Yellow Pages for where to call or contact the A.O. Smith P TEMPERA TURE AND F GAS SUPPLY PRESSURE RELIEF VALVE Water Products Company, 125 Southeast Parkway,
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WARNING GENERAL SAFETY INFORMATION Should you choose to apply an insulation blanket to this heater, you should follow these instructions, see Figure 1 for identification of components mentioned below. Failure to follow these instructions can restrict the air flow required for proper EXTERNAL DAMAGE combustion, potentially resulting in fire, asphyxiation, serious personal injury or death. Do not operate the water heater until it has been fully checked out by a qualified technician, if th
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Canadian Standards Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131, and both documents are available CAUTION from the National Fire Protection Association, 1 Batterymarch In cold climates provide protection against freeze-up. Park, Quincy, MA 02269. THE HEATER SHOULD BE LOCATED IN AN AREA WHERE The appliance, when installed, must be electrically grounded LEAKAGE OF THE TANK OR CONNECTIONS WILL NOT in accordance with local codes or in the absence of local RESULT IN DAMAGE TO THE
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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 BEFORE PLACING THE HEATER IN OPERATION, CHECK expansion of heated water causing premature tank failure or FOR GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR intermittent relief valve operation. This type of failure is not co
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• The Power Direct Vent outlet terminal of over 50,000 BtuH COMBUSTION AIR AND EXHAUST input models shall terminate at least 12" (30.5 cm) below, 12" (30.5 cm) horizontally from or 12" (30.5 cm) above any door, WARNING window or gravity air inlet into the building, see Figure 4. WHEN DETERMINING THE INSTALLATION LOCATION FOR A POWER DIRECT VENT WATER HEATER, SNOW • 18" (45.7 cm) minimum from other natural draft (gravity) ACCUMULATION AND DRIFTING SHOULD BE CONSIDERED direct vent, power vent or
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AIR FOR VENTILATION FOR APPLIANCES WARNING LOCATED IN CONFINED SPACES VENT TERMINATION MUST NOT BE WITHIN 4 FEET (122 cm) OF ANY ITEMS SUCH AS GAS METERS, GAS VALVES OR OTHER Air for ventilation should be provided if installed in a confined GAS REGULATING EQUIPMENT. space. Refer to the National Fuel Gas Code, ANSI Z223.1. WIRE FENCE When the water heater outlet terminal is low enough to be touched accidentally, or is accessible to small children, a wire mesh chain link fence (as show in Figur
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FIGURE 11. STANDARD MODELS. FIGURE 14. * If making an immediate horizontal run of vent off the blower, two 3" PVC or ABS Schedule 40 street elbows are required. 1. The water heater requires its own (separate) venting system. 2. 3" PVC, ABS or CPVC Schedule 40 piping and fittings are acceptable materials for the vent system. 3. It cannot be connected to existing vent piping or chimney. 4. When venting through an outside wall, the vents must terminate horizontally to the outdoors. VENTING SYST
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9. Remember that vent pipes must be adequately and securely supported. APPROXIMATE SETTING TIME FOR 2-1/2" to 4" PIPE JOINTS. MOVEMENT COMPLETE OF JOINT SET 90°F (32°C) TO 150°F (66°C) 3/4 hr. 8 hrs. 50°F (10°C) TO 90°F (32°C) 1 hr. 15 hrs. 9°F (-12°C) TO 50°F (10°C) 1-1/3 hr. 18 hrs. VENT PIPE SEPARATION The inlet and outlet vent pipes must be separated by a minimum distance of 6-1/2" (16.5 cm) up to 24" (61cm) maximum. FIGURE 17. Cementing PVC, ABS or CPVC Pipe and Fittings Read and observe al
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(50 Gal. (189.3 L) Hi BTU input & all 75 Gal. (283.9 L) Models wall will help minimize discoloration of the wall. Note that the only) is supplied on certain models only. (More may be required inside flue mounting adaptors must be slipped over the vent and must be supplied locally). piping before locating the pipe through the wall. Before securing the inside and outside collars to the wall, use a silicone sealer 1. The water heater requires its own (separate) venting system. between pipe and open
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GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN WARNING THE ABSENCE OF LOCAL CODES, WITH THE NATIONAL DISCONNECT FROM ELECTRICAL SUPPLY BEFORE ELECTRICAL CODE, ANSI/NFPA 70. SERVICING UNIT. REPLACE ALL DOORS AND PANELS If local codes do not permit use of a flexible power supply cord. BEFORE OPERATING HEATER. IF ANY OF THE ORIGINAL WIRES SUPPLIED WITH THE OPTIONAL Field Installed Wiring APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED 1. Remove screws to remove wiring junction cover. WITH APPLIAN
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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. This appliance does not have a pilot. It is equipped • If you cannot reach your gas supplier, call the fire with an ignition device which automatically lights department. the burner. Do NOT try to light the pilot by hand
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Figure 28 shows the approximate water temperatures produced at various thermostat dial settings. Short repeated heating cycles OPERATION caused by small hot water uses can cause temperatures at the point of use to exceed the thermostat setting by up to 30°F (-1°C). If you experience this type of use you should consider NEVER OPERATE THE HEATER WITHOUT FIRST BEING using lower temperature settings to reduce scald hazards. CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF VALVE
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CONTROL SEQUENCE - HOT SURFACE DIRECT IGNITION WATER HEATING IGNITION SEQUENCE Pre-purge 5 seconds. (Make sure gas and electric power are connected properly) HSI Warm-up 20 seconds. Ignition Activation Period 4 seconds. 1. The ignition control module is powered and monitors the Flame Recognition Period 1 second. system, waiting for a call for heat from the thermostat. Ignition Trial 4 seconds. Interpurge 5 seconds. 2. The thermostat calls for heat by reading a resistance value Post-purge 5 secon
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USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS CONTACT AND DISCHARGE SAFELY TO PREVENT WATER COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE DAMAGE. GAS CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE INSPECTED FOR PROPER OPERATION PERIODICALLY BY DRAINING A QUALIFIED SERVICE TECHNICIAN. If the heater is to be shut off and exposed to freezing MAIN BURNER temperatures, it must be drained. Water, if left in the tank and allowed to freeze, will damage the heater. Check main burner every 12 month
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A hydrogen sulfide (rotten egg) odor may result if water contains • If after working with your dealer or service agent the problem has not been resolved to your satisfaction, please let us high sulfate and/or minerals. Chlorinating the water supply know by either writing to us at: should minimize the problem, see EXTENDED NON-USE PERIODS. A.O. Smith Water Products Company Service Department NOTE: Anode rod must remain installed (except for inspection) 106 Adkisson St. to avoid shortening tank li
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WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE. OPERATE ONLY AS WIRED FROM FACTORY. TROUBLE SHOOTING Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician. Read the GENERAL SAFETY INFORMATION section first. PROBLEM SOLUTION LED STATUS An open earth ground circuit to the 1. Check that the earth ground connection is ignition system. properly connected. A B C 2. Check that the ground conductor on the w
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TROUBLE SHOOTING (Continued) PROBLEM CAUSE SOLUTION 1) Blower will not run. A) “ON/OFF” control switch turned off. Turn switch to the “ON” position. B) Blower unplugged. Plug blower back into 115 Vac. outlet. C) No power at outlet. Repair service to outlet. D) Thermostat defective. Replace thermostat. E) Control harness defective. Replace control harness. F) High limit control circuit open. Replace ECO. NOT ENOUGH G) Blower motor defective. Replace Blower Assembly. HOT WATER Thermostat problems.
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LIMITED RESIDENTIAL GAS WARRANTY THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY. If a. Labor charges for service, removal, or reinstallation of the water the glass lined tank in this water heater shall prove upon examination by heater or part thereof. A. O. Smith Corporation (the warrantor) to have leaked during the b. Shipping and delivery charges for forwarding the new water heater warranty period in normal residential use, due to natural corrosion from or replacement part from the ne
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125 SOUTHEAST PARKWAY • FRANKLIN, TN 37068 Phone: 1-800-433-2545 • Fax: 1-800-433-2515 www.aosmithwaterheaters.com / email: parts @hotwater.com 20
