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  2. A.O. Smith
  3. Water Heater
  4. 185874-001
  5. Instruction Manual

A.O. Smith 185874-001 Instruction Manual

Manual is about: A.O. Smith Residential Hybrid Gas Water Heater Instruction Manual

Summary of 185874-001

  • Page 1

    Instruction manual printed 0807 185874-001 keep this manual in the pocket on heater for future reference whenever maintenance adjustment or service is required. For use only in manufactured homes all technical and warranty questions: should be directed to the local dealer from whom the water heater ...

  • Page 2

    2 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 own water heater to warn you and others of a poten...

  • Page 3: General Safety

    3 general safety.

  • Page 4: Introduction

    4 safe installation, use and service............................2 general safety..................................................................3 table of contents ............................................................4 introduction ..............................................................

  • Page 5: Typical Installations

    5 typical installations get to know your water heater - gas models a vent pipe b drafthood c anode d hot water outlet e outlet f roof jack g gas supply h manual gas shut-off valve i ground joint union * install in accordance with local codes. * drip leg as required by local codes. Figure 1. J drip l...

  • Page 6: Typical Installations

    6 typical installations figure 2. * mixing valve usage this appliance has been design certified as complying with american national standard/csa standard for water heaters and is considered suitable for: water (potable) heating: all models are considered suitable for water (potable) heating. Hotter ...

  • Page 7

    7 facts to consider about the location this manufactured home gas-fired water heater is for use in a manufactured home. You should carefully choose an indoor location for the new water heater, because the placement is a very important consideration for the safety of the occupants in the building and...

  • Page 8

    8 also, the water heater must be located and/or protected so it is not subject to physical damage by a moving vehicle. This water heater must not be installed directly on carpeting. Carpeting must be protected by metal or wood panel beneath the appliance extending beyond the full width and depth of ...

  • Page 9

    9 securing water heater to floor and wall the water heater must be secured to the floor and to the wall of the enclosure with the three mounting brackets and screws packaged in the carton with the water heater. The two small brackets stamped #0110064 are used to attach the water heater to the floor ...

  • Page 10

    10 the water within the water heater tank expands as it is heated and increases the pressure of the water system. If the relieving point of the water heater’s temperature-pressure relief valve is reached, the valve will relieve the excess pressure. The temperature-pressure relief valve is not intend...

  • Page 11

    11 this heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer. The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements...

  • Page 12

    12 to fill the water heater with water: 1. Close the water heater drain valve by turning the handle to the right (clockwise). The drain valve is on the lower front of the water heater. 2. Open the cold water supply valve to the water heater. Note: the cold water supply valve must be left open when t...

  • Page 13

    13 chemical vapor corrosion of the flue and vent system may occur if air for combustion contains certain chemical vapors. Spray can propellants, cleaning solvents, refrigerator and air conditioner refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes, bleach and process chemicals...

  • Page 14

    14 connecting the gas piping to the gas control valve of the water heater can be accomplished by either of the two methods shown in figures 9 and 10. Sediment traps a sediment trap shall be installed as close to the inlet of the water heater as practical at the time of water heater installation. The...

  • Page 15

    15 9. Remove flange nuts holding inner door in place with 3/8” nut driver, see figure 13. Figure 13. 10. Loosen flare nut “t” holding thermocouple to bottom of gas valve with 3/8” open-end wrench and pull down to remove, see figure 14. 11. Loosen flare nut “p” holding pilot line to bottom of gas val...

  • Page 16

    16 23. Place screwdriver in slot “c”, see figure 19. Depress and turn counterclockwise ( ) to stop. Control screw must be in “in” position for propane (lp) gas and in “out” position for natural gas. Stop! Read label “for your safety” located on your water heater. Figure 19. 24. Light pilot following...

  • Page 17

    17 figure 21. 8. Unplug wire from igniter assembly mounted on the side of the gas valve. 9. Remove flange nuts holding inner door in place with 3/8” nut driver, see figure 22. Figure 22. 10. Loosen flare nut “t” holding to bottom of gas valve with 3/8” open-end wrench and pull down to remove, see fi...

  • Page 18

    18 19. Push the propane gas pilot assembly grommet out of the inner door towards the combustion chamber. 20. To install the natural gas pilot assembly, pull the igniter wire, thermostat lead, and pilot tube through the inner door hole. Reinstall the phillips-head screw securing the tco bracket too t...

  • Page 19: White-Rodgers Gas Valve

    19 white-rodgers gas valve.

  • Page 20: Robertshaw Gas Valve

    20 robertshaw gas valve.

  • Page 21: Installation Checklist

    21 installation checklist before lighting the pilot: 1. Check the gas lines for leaks. A. Use a soapy water solution. Do not test for gas leaks using a match or open flame. B. Brush the soapy water solution on all gas pipes, joints and fittings. C. Check for bubbling soap. This means you have leak. ...

  • Page 22: Temperature Regulation

    22 for the robertshaw control, turn the water temperature dial counterclockwise ( ) to decrease the temperature, or clockwise ( ) to increase the temperature. Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance. Figure 29. Robertshaw te...

  • Page 23: For Your Information

    23 for your information start up conditions draft hood operation check draft hood operation by performing a worst case depressurization of the building. With all doors and windows closed, and with all air handling equipment and exhaust fans operating such as furnaces, clothes dryers, range hoods and...

  • Page 24

    24 the local water heater supplier or service agency for further information concerning an anode replacement kit and this chlorination treatment. If the smelly water persists after the anode replacement and chlorination treatment, we can only suggest that chlorination or aeration of the water supply...

  • Page 25: Periodic Maintenance

    25 venting system inspection at least once a year a visual inspection should be made of the venting system. You should look for: 1. Obstructions which could cause improper venting. The combustion and ventilation air flow must not be obstructed. 2. Damage or deterioration which could cause improper v...

  • Page 26

    26 anode rod inspection 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 27

    27 1. Turn the gas control knob to the “off” position. 2. Close the cold water inlet valve to the water heater. 3. Open a nearby hot water faucet and leave open to allow for draining. 4. Connect a hose to the drain valve and terminate to an adequate drain. 5. Open the water heater drain valve to all...

  • Page 28: Leakage Checkpoints

    28 leakage checkpoints read this manual first. Then before checking the water heater make sure the gas supply has been turned “off”, and never turn the gas “on” before the tank is completely full of water. A. Water at the draft hood is water vapor which has condensed out of the combustion products. ...

  • Page 29

    29 30 & 40 gallon repair parts list key no. Part description *1 burner assembly (white-rodgers)** burner assembly (robertshaw)** *2 burner head (natural gas) burner head (propane gas) *3 burner orifice (natural gas) burner orifice (propane gas) 4 burner tube (white-rodgers)** burner tube (robertshaw...

  • Page 30

    30 robertshaw burner assembly 1 white-rodgers burner assembly 1 50 gallon repair parts list key no. Part description *1 burner assembly (white-rodgers)** burner assembly (robertshaw)** *2 burner head (natural gas) burner head (propane gas) *3 burner orifice (natural gas) burner orifice (propane gas)...

  • Page 31: Troubleshooting Guidelines

    31 troubleshooting guidelines these guidelines should be utilized by a qualified service agent. When calling for service notify the service agent that this is a “flammable vapor ignition resistant” product. Problem cause solution water leaks improperly sealed, hot or cold supply connection, relief v...

  • Page 32

    32.