A.O. Smith 100 Series Installation Instructions Manual

Manual is about: RESIDENTIAL GAS WATER Heaters POWER VENT/POWER DIRECT VENT GAS MODELS WITH HOT SURFACE IGNITION

Summary of 100 Series

  • 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 fvir gas...

  • Page 2

    2 table of contents water heater safety .......................................................................................................................................................................... 1 -2 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 fire or explosion harzard do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Avoid all ignition sources if you smell natural or lp gas. Do not expose water heater control to excessive gas pressure. Use only gas shown on rating plate. ...

  • 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) * install in accordance with local codes. * drip leg as requi...

  • 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 fv sensor figure 1. The patented system protects your family by trapping the burning vapors within the water heater combustion chamber through the special flame-arrestor. The burning vapors literally “burn themselves out” without escaping back into the room. In the event of a flammable vapor incid...

  • 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 check with local utility for minimum height 3” minimum drip leg ground joint union manual gas shut-off valve suitable drain 6” maximum air gap discharge pipe (do not cap or plug) figure 5. Gas pressure warning explosion hazard • gas leaks can not always be detected by smell. • gas suppliers recomm...

  • Page 10: Warning

    10 lp gas only warning explosion hazard have a qualified person make sure l.P. Gas pressure does not exceed 13” water column. Examples of a qualified person include: licensed plumbers, authorized gas company personnel, and authorized service personnel. Failure to do so can result in death, explosion...

  • 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” maximum permanent openings to the outside or additional rooms within the building closet or other confined space 12” maximum figure 6. 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 t...

  • Page 13

    13 alternative opening location 1 sq. Inch per 3000 btuh confined space all air from outdoors - using a single permanent opening figure 11. 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...

  • Page 14

    14 align the legs of the draft hood with the slots provided. Insert the draft hood leg tips into slots on the flue damper’s flange as shown in figure 12. Secure the draft hood by twisting or bending the leg tips. See figure 12. Do not alter the draft hood in any way. If you are replacing an existing...

  • Page 15

    15 piping installation piping, fittings, and valves should be installed according to the installation drawing (figure 16). 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 suitable drain hot water outlet cold water inlet pressure reducing valve with bypass cold water supply to fixtures cold water inlet valve (shut-off valve) in a closed system use a thermal expansion tank temperature and pressure (t&p) relief valve not shown) drain line 3/4” id minimum metal drain ...

  • Page 17

    17 the discharge line: • must not be smaller than the pipe size of the relief valve or have any reducing coupling installed in the discharge line. • must not be capped, blocked, plugged or contain any valve between the relief valve and the end of the dis- charge line. • must terminate a maximum of s...

  • Page 18

    18 □ fresh air openings sized correctly with consideration given to the blocking effect of louvers and grilles. □ 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 ma...

  • Page 19: Warning

    19 warning explosion hazard replace view port if glass is missing or damaged. Failure to do so can result in death, explosion or fire. Lighting instructions read and understand these directions thoroughly before attempting to start or re-start the water heater. Make sure the viewport is not missing ...

  • Page 20: Warning

    20 water temperature regulation water temperature over 125°f (52°c) can cause servere burns instantly resulting in severe injury or death. Children, the elderly, and the physically or mentally disabled are at highest risk for scald injury. Feel water before bathing or showering. Temperature limiting...

  • Page 21

    21 gas control/temperature knob status light on off status 120°f position a b c • • ve ry hot hot low vac a b c • • ver y hot hot low vac 160°f (approx.) 110°f (approx.) 70°f (approx.) water temperature °f time for 1st degree burn (less severe burns) time for permanent burns 2nd & 3rd degree (most s...

  • Page 22: Warning

    22 electrical connections/wiring diagram electrical connections before plugging in the water heater, always make sure: • the voltage and frequency correspond to that specified on the water heater. • the electrical outlet has the proper overload fuse or breaker protection. • water heater to be locate...

  • Page 23

    23 periods of heat-up and cool-down. 2. Condensation causes sizzling and popping within the burner area and should be considered normal. 3. Sediment buildup in the tank bottom will create varying amounts of noise and may cause premature tank failure. Drain and flush the tank as directed under the “d...

  • Page 24

    24 anode rod/water odor each water heater contains at least one anode rod, which will slowly deplete while protecting the glass-lined tank from corrosion and prolonging the life of the water heater. Once the anode is depleted, the tank will start to corrode, eventually developing a leak. Certain wat...

  • Page 25

    25 properly. To prevent water damage, the valve must be properly 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 t...

  • Page 26

    26 removing the burner from the manifold/ burner assembly natural gas (low nox) & l.P. Gas burner 1. Take off the burner by removing the two (2) screws lo- cated underneath the burner. 2. Check the burner to see if it is dirty or clogged. The burner may be cleaned with soap and hot water (figure 28)...

  • Page 27: Warning

    27 cleaning the combustion chamber and flame-arrestor 1. Follow procedure outlined in “removing the manifold/ burner assembly”. 2. Use a vacuum cleaner/shop vac to remove all loose debris in the combustion chamber (figure 32). Use compressed air to clear any dust or debris that may have accumulated ...

  • Page 28

    28 manifold tube bracket tab slot burner close-up inside view of the combustion chamber. Figure 34. Igniter system the stp (spark-to-pilot) igniter system consists of the pilot, electrode, and wire. The pilot is ignited by an electric spark generated when the gas control valve/thermostat sends an el...

  • Page 29

    29 fvir system operational checklist 1. Manifold gasket properly sealed. 2. Viewport not damaged or cracked. 3. Flame-arrestor free of debris and undamaged. 4. Two piece wire connector properly installed. 5. No leaks at pilot and manifold connection. 6. Manifold door screws securely tightened. 7. De...

  • Page 30

    30 insufficient hot water 1. Thermostat set too low 2. Sediment or lime in tank 3. Water heater too small 4. Wrong piping connections 5. Leaking faucets 6. Wasted hot water 7. Long runs of exposed piping 8. Hot water piping in outside wall 9. Low gas pressure 1. Turn temperature dial to desired sett...

  • Page 31

    31 status light troubleshooting flowchart status light code led flash sequence control status corrective action short flash once every four second idle (no call for heat, no fault conditions) “heartbeat”, alternates bright/dim call for heat (no fault conditions) one flash, three second pause low fla...

  • Page 32

    32 status light troubleshooting flowchart led flash sequence control status corrective action six-two flash, three second pause soft lockout* - recycle limit - flame lost - end switch fails turn the power switch on the gas control valve to the “off” position and unplug the power cord from the power ...

  • Page 33

    33 sequence of operation chart apply power to appliance. Is damper closed? Y is there a call for heat. Is damper open? Will not attempt to light. 2 flash error code. See corrective action table on pages 31-32. N damper energizes. Gas valve attempts to open damper for 30 seconds, displays 3 flash err...

  • Page 34: Repair Parts List

    34 repair parts illustration legend special anode rod (see anode rod/water odor section) temperature and pressure relief valve is required, but may not be factory installed unique: fvir system parts 1 2 3 4 8 5 10 11 9 7 6 13 12 14 18 when ordering repair parts always give the following information:...

  • Page 35

    35 listed parts kits and illustrations item 12a: pilot/igniter-flame sensor assembly kit, which contains the pilot, igniter-flame sensor, and retainer clip (natural gas) item 12b: pilot/igniter-flame sensor assembly kit, which contains the pilot, igniter-flame sensor, and retainer clip (l.P. Gas) it...

  • 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...