A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual

Manual is about: RESIDENTIAL GAS WATER HEATERS

Summary of HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER

  • Page 1

    1 this water heater complies with ansi z21.10.1-current edition regarding the accidental or unintended ignition of fl ammable vapors, such as those emitted by gasoline. For your safety an odorant is added to the gas used by this water heater. • safety instructions • installation • operation printed ...

  • Page 2

    2 table of contents water heater safety ........................................................................................................................................................................... 1-4 safe installation, use and service ....................................................

  • Page 3: Danger

    3 safe installation, use and service your safety and the safety of others is extremely important in the installation, use and servicing of this water heater. Many safety-related messages and instructions have been provided in this manual and on your water heater to warn you and others of a potential...

  • Page 4

    4 breathing hazard - carbon monoxide gas install vent system in accordance with codes. Do not operate water heater if flood damaged heater should not be installed for high altitude operation above 10,100 feet (3,078 m). Do not operate if soot buildup. Do not obstruct water heater air intake with ins...

  • Page 5

    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...

  • Page 6: Warning

    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...

  • Page 7: Warning

    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,)...

  • Page 8

    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...

  • Page 9: Warning

    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 utility for minimum height. 6” max. Air gap suitable drain discharge pipe (do not plug or cap) 3” minimum drip leg ground joint union figure 3...

  • Page 10: Warning

    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...

  • Page 11: Warning

    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 t...

  • Page 12

    12 12” max. Permanent openings to the outside or additional 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 roo...

  • Page 13

    13 figure 8b. Vent pipe system this water heater uses a non-direct, single-pipe vent system to remove exhaust gases created by the burning of fossil fuels. Air for combustion is taken from the immediate water heater location or is ducted in from the outside (see “combustion air supply and ventilatio...

  • Page 14

    14 40 gal. Water heater: align the reducer flue over top of baffle as shown in figure 9 (note: reducer flue must be installed on 40 gal. Water heater above elevation 5,400 ft. (1,646 m) from sea level). 40 & 50 gal. Water heaters: align the legs of the draft hood with the slots provided. Insert the ...

  • Page 15

    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 thi...

  • Page 16

    16 hot water outlet 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: ins...

  • Page 17

    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 inspection ...

  • Page 18: Warning

    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...

  • Page 19

    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...

  • Page 20: Warning

    20 warning explosion hazard replace view port if glass is missing or 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 damag...

  • Page 21: Warning

    21 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 the draft warning burn hazard do not touch...

  • Page 22

    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...

  • Page 23

    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...

  • Page 24

    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 ...

  • Page 25

    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...

  • Page 26: Warning

    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 ...

  • Page 27

    27 3. Insert the manifold/burner assembly into the burner compartment making sure that the tip of the manifold tube engages in the slot of the bracket inside the combustion chamber (figure 29). 4. Inspect the door gasket and make sure there is no fiberglass insulation between the gasket and the comb...

  • Page 28

    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...

  • Page 29

    29 problem possible cause(s) corrective action water leaks 1. Improperly sealed, hot or cold supply connections, relief valve, drain valve or thermostat threads. 2. Leakage from other appliances or water lines. 3. Condensation of flue products. 4. Excessive water pressure. 5. Heater stacking. 6. Clo...

  • Page 30

    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...

  • Page 31

    31 6. “p-sw”, “open”, and “clean screen” flashing the air pressure switch contacts remain open longer than 11 seconds after the combustion fan is energized. 1. Clean the screen on the combustion air intake chamber. Turn the power “off” for 10 to 20 seconds then “on” again to clear 2. Ensure the pres...

  • Page 32

    32 11. “fv-sense” and “open” flashing flammable vapor sensor is open 1. Check all wiring to the flammable vapor sensor. 2. Remove the connectors from the flammable vapor sensor and measure the resistance of the sensor with an ohmmeter. A. If the reading taken is more than 1.7 million ohms, replace t...

  • Page 33

    33 please note: the control continually monitors internal circuits and external sensors. Error codes noted above, and those for self-diagnostic faults can be found on pages 30 through 32. Apply power to appliance yes request for heat present? No is pressure switch proven open within 5 seconds? No co...

  • Page 34: Repair Parts List

    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* ...

  • Page 35

    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. ...

  • Page 36

    36 notes.

  • Page 37

    37 notes.

  • Page 38

    38 notes.

  • Page 39

    39 this warranty is applicable to the original owner only in accordance with the warranty terms and conditions specifi 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, 2...

  • Page 40

    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...