Thank you for buying this energy efficient water heater from A.O. Smith Water Products Company. We appreciate your confidence in our products. CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE TO YOUR SAFETY.
ROUGH-IN DIMENSIONS ... FOREWORD ... FEATURES ... Water Temperature Control ... High Limit Switch (E.C.O.) ... Dishwashing Machine Requirement ... Circulating Pump ... INSTALLATION INSTRUCTIONS ... Required Ability ... Insulation Blankets ... Locating The Heater ... Clearances ... Hard Water ... Air Requirements ...
The temperature may be adjusted from 80°F/27°C to 180°F/82°C. The thermostat was adjusted to 120°F/49°C before the heater was shipped from the factory. It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature be set for the lowest temperature which satisfies your hot water needs.
• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • Do obtain new labels from A.O. Smith for placement on the blanket directly over the existing labels. LOCATING THE HEATER...
CLEARANCES These heaters are approved for installation on combustible flooring in an alcove when the minimum clearances from any combustion construction are followed as indicated in Figure 4. In all installations the minimum combustible clearances from any vent piping shall be 0". Vent piping passing through a combustible wall or ceiling must be a continuous run (no joints).
US DIRECT VENT CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. CANADIAN DIRECT VENT FIGURE 5.
US HORIZONTAL VENT CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. CANADIAN HORIZONTAL VENT FIGURE 6.
Heater must be protected from freezing downdrafts during shutdown periods. WARNING NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR ASPHYXIATION. VENT PIPE TERMINATION NOTE: Before installing venting, determine place of vent pipe termination.
2. The horizontal centerline of the intake vent terminal may not be located lower than the horizontal centerline of the exhaust vent terminal (see Figure 9). FIGURE 9. INSTALLATION SEQUENCE For installations in the City of Los Angeles, California Category IV PVC Pipe such as that manufactured by Brownline Pipe Company, must be used as vent pipe material.
2. Drill a pilot hole approximately 1/4" (6 mm) outside of the marked circle. This pilot hole is used as a starting point for a saws-all or sabre saw blade. Cut around the marked circle staying approximately one quarter inch outside the line. (This will allow the vent pipe to easily slide through the opening).
VENT PIPE PREPARATION 1. INITIAL PREPARATION A. Make sure the solvent cement you are planning to use is designed for the specific application you are attempting. B. Know the physical and chemical characteristics and limitations of the PVC, PVC cellular core, ABS or CPVC piping materials that you are about to use.
HOT SURFACE IGNITER The Hot Surface Igniter is a device that ignites the main burner by high temperature (>1800°F or >982°C). When 120VAC is applied to the igniter, sufficient heat is generated to ignite the main burner. Although improvements have been made to strengthen the igniter, it is fragile and care must be taken when handling the igniter to prevent breakage.
OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS SHUTOFF VALVE. BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR GAS LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER MATERIAL ACCEPTABLE FOR THE PURPOSE OF LOCATING GAS LEAKS.
2. Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system. 3. This unit may never be connected to any existing heating system or component(s) previously used with non-potable water heating appliance. 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed.
FIGURE 16. OPERATION SEQUENCE OF OPERATION Typical Control/Appliance Operating Sequence When the control is powered, it should first display “0”, then the input line voltage (“120”), the calibration setting (12), then the actual water temperature in the tank. If the control determines that the actual water temperature inside the tank is below the programmed temperature setpoint less the differential, a call for heat is activated.
ERROR CODES The following Error Codes are external to the controller. 01 Pressure Switch Fail On, should be Off 11 Pressure Switch Fail Off, should be On 02 Ignition Fail after 3 attempts 04 ECO Open 05 Temperature Probe Open 15 Temperature Out of Bounds <...
Display Flashes “05” when button is pressed: Possible Cause 1. Temperature Probe wiring 1. Repair Wiring open 2. Defective probe 2. Replace probe Display Flashes “15” when button is pressed: Possible Cause 1. No water in tank and tank 1. The symptom does not in freezing conditions 2.
PRIOR TO START UP - REQUIRED ABILITY INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK ARE REQUIRED. Before attempting start-up, thoroughly study and familiarize yourself with the exact sequence of operation and all other details on the specific heater being used.
c. Remove the pressure regulator cover screw (Figure 16) and adjust the pressure by turning the adjusting screw with a small screwdriver. In this example, with heater running on natural gas, do not exceed 5.0" (1.25 kPa) Water Column. Clockwise to increase gas pressure and input rate. Counterclockwise to decrease gas pressure and input rate.
WARNING UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER. CATHODIC PROTECTION CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).
MAINTENANCE SCHEDULE Following are the instructions for performing some of the recommended maintenance. Unit inspection and adjustment should be performed by a competent technician. COMPONENT OPERATION INTERVAL Tank Sediment Removal Tank Lime Scale Removal Annually Powered Anode Inspect System Annually Relief Valve Inspect Annually...
Hydrochloric base acids are not recommended for use on glass-lined tanks. A.O. Smith Form No. 4800 Rev. 8, entitled “Why, When and How”, describes tank cleaning methods and materials. UN•LIME and the booklet may be obtained through your A.O. Smith dealer or distributor.
CAUTION BEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THAT A DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECT THE DISCHARGE TO AN OPEN DRAIN. FAILURE TO TAKE THIS PRECAUTION COULD MEAN CONTACT WITH EXTREMELY HOT WATER PASSING OUT THE VALVE DURING THIS CHECKING OPERATION.
ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3.
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE FIXTURES. TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION TWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER HEATER) WITH OR WITHOUT BUILDING RECIRCULATION MUST BE IDENTICAL HEATERS FOR MULTIPLE HEATER INSTALLATION SEE MANIFOLD KIT SPECIFICATIONS, PAGE 30. CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK- FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF...
TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER) WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES * PIPE RELIEF VALVE TO OPEN DRAIN ** 140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM WATER...
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
MANIFOLD KITS 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. Plus, the units with the higher water flow may have a shortened life.
IF YOU DO NOT HAVE THE PROPER TEST EQUIPMENT, I.E. A VOLT-OHM METER AND A MICROMETER, DO NOT ATTEMPT TO TROUBLESHOOT OR REPAIR A.O. SMITH EQUIPMENT. ALTERING THE CONTROLLER AND/OR CONTROLLER WIRING IN ANY WAY COULD RESULT IN INTERNAL DAMAGE TO THE...
Replacement parts may be ordered through A.O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact the A.O. Smith Water Products Company, 125 Southeast Parkway, Franklin, TN 37068, 1-800-433-2545. When ordering parts be sure to state the quantity, part number and description of the items including the complete model and serial number as it appears on the product.
A.O. Smith water heater of equivalent size and current model at the warrantor's option. 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.