A.O. Smith 315456-002 - Manual

5 TYPICAL INSTALLATION GET TO KNOW YOUR WATER HEATER - GAS MODELS A Vent Pipe B Draft hood C Anode (Not Shown) D Hot Water Outlet E Insulation F Gas Supply Piping G Manual Gas Shut-off Valve H Ground Joint Union I Drip Leg (Sediment Trap) J Inner Door K Outer door L Union M Inlet Water Shut-off Valv...

6 INSTALLING YOUR GAS WATER HEATER Important Information About This Water Heater This gas water heater was manufactured to voluntary safety standards to reduce the likelihood of a flammable vapor ignition incident. New technology used in meeting these standards makes this product more sensitive to i...

7 Location Requirements Carbon Monoxide Poisoning Hazard WARNING Do not install in a mobile home. Doing so can result in carbon monoxide poisoning and death. The FVIR System is designed to reduce the risk of flammable vapor-related fires. Flammable liquids (such as gasoline, solvents, propane, etc,)...

8 IMPORTANT: The water heater should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the water heater or to lower floors of the structure. Due to the normal corrosive action of water, the tank will eventually leak after an extended per...

9 Manual Gas Shut-Off Valve Install a readily acces-sible manual shut-off valve in the gas supply line as recommended by the local utility. Check with local utilityfor minimum height. 6” Max. Air Gap Suitable Drain Discharge Pipe (Do Not plug or cap) 3” Minimum Drip Leg Ground Joint Union FIGURE 3. ...

10 WARNING • Use a new CSA approved gas supply line. • Install a shut-off valve. • Do not connect a natural gas water heater to an L.P. gas supply. • Do not connect an L.P. gas water heater to a natural gas supply. • Failure to follow these instructions can result in death, explosion, or carbon mono...

11 TABLE 3 BTUH Input Minimum Square Feet with 8’ Ceiling Typical Room with 8’ Ceiling 30,000 188 9 x 21 45,000 281 14 x 20 60,000 375 15 x 25 75,000 469 15 x 31 90,000 563 20 x 28 105,000 657 20 x 33 120,000 750 25 x 30 135,000 844 28 x 30 IMPORTANT:• The area must be open and be able to provide th...

12 12” Max. Permanentopenings to the outside oradditional rooms within the building Closet or other confined space 12” Max. FIGURE 4. All Air from Inside the Building When additional air is to be provided to the confined area from additional room(s) within the building, the total volume of the room(...

14 Align the legs of the draft hood with the slots provided. Insert the legs and secure the draft hood to the water heater’s top with the four screws provided as shown in Figure 9. Do not alter the draft hood in any way. If you are replacing an existing water heater, be sure to use the draft hood su...

15 Piping Installation Piping, fittings, and valves should be installed according to the installation drawing (Figure 13). If the indoor installation area is subject to freezing temperatures, the water piping must be protected by insulation.The water supply pressure should not exceed 80 psi. If this...

16 Hot WaterOutlet In a closed system use a thermal expansion tank Cold Water Inlet Valve Pressure Reducing Valve with Bypass Main Water Supply Cold Water Supply to Fixture Discharge line (Do Not Cap or Plug) Drain line 3/4” ID Min. Drain 1“ Min. Metal Drain Pan 1-3/4” Depth Max. Massachusetts: Inst...

17 For protection against excessive pressures and temperatures, a temperature and pressure relief valve must be installed in the opening marked “T & P RELIEF VALVE” (see Figure 15A). This valve must be design certified by a nationally recognized testing laboratory that maintains periodic inspect...

18 A diaphragm-type expansion tank suitable for potable water will normally eliminate this weeping condition. Please read and follow the manufacturer’s instructions for the installation of such tanks. MASSACHUSETTS CODE DOES NOT ALLOW THIS TYPE OF INSTALLATION. Must Be Vertical To Remove Air Bubbles...

19 □ Ductwork is the same cross-sectional area as the openings. Vent Pipe System Check for proper drafting at the water heater draft hood. Refer to the “Checking the Draft” section of this manual for the test procedure. If the procedure shows insufficient draft is present, please check the following...

20 WARNING Explosion Hazard Replace view port if glass is missingor damaged. Failure to do so can result in death,explosion or fire. Operating Instructions Read and understand these directions thoroughly before attempting to operate the water heater. Make sure the view port is not missing or damaged...

21 MATCH RELIEF OPENING DRAFT HOOD FIGURE 18. If the flame flutters or is blown out, combustion products are escaping from the relief opening. If this occurs, do not operate the water heater until proper adjustments or repairs are made to the vent pipe system and/or air supply requirements. Checking...

22 Burner Flames Inspect the burner flames through the viewport and compare them to the drawings in Figure 19. A properly operating burner should produce a soft blue flame. Blue tips with yellow inner cones are satisfactory. The tips of the flame may have a slight yellow tint. The flame should not b...

23 Good venting is essential for a gas fired water heater to operate properly as well as to carry away products of combustion and water vapor. It is always recommended that a suitable metal drain pan be installed under the water heater to protect the area from water damage resulting from normal cond...

24 Powered Anode Operation To protect the glass-lined water tank from corrosion through electrolysis, this water heater is equipped with a non sacrificial powered anode rod. The powered anode rod is non sacrificial and should not need to be replaced unless damaged.If the powered anode rod has been d...

25 properly. To prevent water damage, the valve must be pro- perly connected to a discharge line which terminates at an adequate drain. Standing clear of the outlet (discharged water may be hot), slowly lift and release the lever handle on the temperature and pressure relief valve to allow the valve...

26 Replacing the Flame Sense/Hot Surface igniter Assembly 1. Remove the manifold/burner assembly. See Removing the Manifold/Burner Assembly. 2. Lift the retainer clip straight up from the back of the manifold component block (using a flat-blade screwdriver), then remove the manifold component block ...

28 TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION NO HOT WATER 1. Transformer unplugged. 2. No power at outlet. 3. Thermostat defective. 4. Air Intake Chamber Fan defective. 5. Pressure Switch defective. 6. Gas Valve/Thermostat Switch in “OFF POSITION”. 1. Plug transformer back in...

30 Please check guidelines below. For your safety, water heater service should be performed only by a qualified service person. Read the GENERAL SAFETY INFORMATION supplied by the water heater manufacturer. 1. “POWER” Flashing Communication Error The system has detected a communication error between...

33 Please Note: The control continually monitorsinternal circuits and extern al sensors.Error codes noted abov e, and those forself-diagnostic faults can be found onpages 30 through 32. APPLY POWER TO APPLIANCE YES REQUEST FOR HEAT PRESENT? NO IS PRESSURE SW ITCH PROVEN OPEN WITHIN 5 SECONDS? NO COM...

34 Item No. Parts Description 1 Draft Hood 2 Flue Baffle 3 Nipple (Hot) 4 Nipple (Cold) 5 Anode Rod 6 Cold Water Inlet Tube 7 Temperature and Pressure Valve 8 Control Display 9 Air Intake Chamber 10 Gas Control Valve/Thermostat 11 Drain Valve 12* Natural Gas Burner 13* Hot Surface Igniter (HSI) 14* ...

35 Listed Parts Kits and Illustrations Item 12: Burner (Natural Gas)Item 13: Flame Sense/Hot Surface Igniter Assembly. Item 14: Manifold door assembly which contains the manifold tube, gasket, manifold door, manifold component block with retainer clip, and flame sense/hot surface igniter assembly. (...

39 THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY in accordance with the warranty terms and conditions speci fi ed below. The warrantor will furnish the ORIGINAL OWNER, 1) a replacement water heater of equivalent size and current model if the glass-lined tank in this water heater leaks and, ...

40 LIMITATION ON IMPLIED WARRANTIES Implied warranties, including any warranty of merchantability imposed on the sale of this heater under state law are limited to one year duration for the heater or any of its parts. Some states do not allow limitations on how long an implied warranty lasts, so the...