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A.O. Smith Commercial gas water heaters Instruction Manual

Other manuals for Commercial gas water heaters: Instruction Manual
Manual is about: COMMERCIAL GAS WATER HEATERS POWER VENT/POWER DIRECT VENT GAS MODELS WITH HOT SURFACE IGNITIO

Summary of Commercial gas water heaters

  • Page 1

    1 instruction manual printed in the u.S.A 0408 197833-000 keep this manual in the pocket on heater for future reference whenever maintenance adjustment or service is required. Power vent/power direct vent gas models with hot surface ignition all technical and warranty questions: should be directed t...

  • 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: General Safety

    4 general safety.

  • Page 5: Introduction

    5 thank you for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service. Abbreviations found in this instruction manual: • csa - canadian standards association • ansi - american national standards institute • nfpa - national fire protection a...

  • Page 6

    6 * caution harness has 120 vac. In operation. ** see “planning the vent system,” “installation of vent system” and “condensate” for more information. Figure 1. Vacuum relief valve *install per local codes m display enclosure ** n exhaust elbow assembly ** o condensate tubing p off/on switch q displ...

  • Page 7: Installation Considerations

    7 rough-in-dimensions model units a b c d e f 100 inches 68.50 49.25 22.00 15.75 3.00 8.00 cm 174 125.09 55.88 40.00 7.62 20.32 top/side inlet and outlet: 3/4” npt gas inlet: 1/2” npt capacity, gas and electrical characteristics model approximate capacity manifold pressure electrical characteristics...

  • Page 8

    8 for all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the commonwealth and where the side w...

  • Page 9

    9 figure 2. Water piping - 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 and space heating: all models are considered suitable for water (potable) heating...

  • Page 10

    10 facts to consider about the location 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 for the most economical use of the appliance. This water heater is not for use in manufact...

  • Page 11

    11 in an alcove or closet, the entire floor must be covered by the panel. Failure to heed this warning may result in a fire hazard. Minimum clearances between the water heater and combustible construction are 0 inch at the sides and rear, 5.5” (14.0 cm) from the front and 12” (30.5 cm) from the top....

  • Page 12

    12 a free area of one square inch per 1000 btu/hr (22 cm 2 /kw) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 cm 2 ). If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors....

  • Page 13

    13 closed water systems water supply systems may, because of code requirements or such conditions as high line pressure, among others, have installed devices such as pressure reducing valves, check valves, and back flow preventers. Devices such as these cause the water system to be a closed system. ...

  • Page 14

    14 figures 2 and 10 show the typical attachment of the water piping to the water heater. The water heater is equipped with 3/4 inch npt water connections. Note: if using copper tubing, solder tubing to an adapter before attaching the adapter to the water heater connections. Do not solder the water l...

  • Page 15

    15 the temperature-pressure relief valve must be manually operated at least once a year , see figure 28. Caution should be taken to ensure that (1) no one is in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) the water manually discharged will not cause...

  • Page 16

    16 sediment traps a sediment trap shall be installed as close to the gas inlet of the water heater as practical at the time of water heater installation. The sediment trap shall be either a tee fitting with a capped nipple in the bottom outlet or other device recognized as an effective sediment trap...

  • Page 17

    17 figure 15b. U.S. Power vent canadian power vent warning vent hood(s) may be extremely hot during operation. Warning vent hood(s) may be extremely hot during operation. Figure 15a. Caution to prevent exhausting products from circulating to the air intake in windy/cold areas, the maximum practical ...

  • Page 18

    18 figure 15d. U.S. Direct vent canadian direct vent warning vent hood(s) may be extremely hot during operation. Warning vent hood(s) may be extremely hot during operation. Figure 15c. Caution to prevent exhausting products from circulating to the air intake in windy/cold areas, the maximum practica...

  • Page 19

    19 planning the vent system plan the route of the vent system from the exhaust elbow to the planned location of the vent terminal. 1. Layout total vent system to use a minimum of vent pipe and elbows. 2. This water heater is capable of venting flue gases equivalent to 25’ (7.6 m) of 2” pipe, 65’ (19...

  • Page 20

    20 installation of vent system before beginning installation of piping system thoroughly read the section of this manual vent pipe preparation. If you are installing your system so that it vents through roof, please refer to section titled installation of vertical vent system. Vent terminal installa...

  • Page 21

    21 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. Caution vent terminals supplied with heater must be used. Note: before beginning installation of any vent pi...

  • Page 22

    22 installation of vent system, sidewall with the route of the venting system and selection of materials completed, as discussed in the section of this manual titled planning the vent system, the through the wall vent terminal in place and the first section of piping, up to first elbow, installed at...

  • Page 23

    23 this concentric vent termination kit may be used with 3 or 4 inch diameter pipe systems. When connecting to a 4 in. Diameter pipe system a 3 x 4 inch field supplied reducer is to be installed at the intake and exhaust connection of the concentric vent termination kit. Safety considerations instal...

  • Page 24

    24 5. Secure assembly to roof structure as shown in figure e using field supplied metal strapping or equivalent support material. Note: ensure termination height is above the roof surface or anticipated snow level (1 ft. In u.S.A. Or 1-1/2 ft. In canada) as shown in figure c. 6. Install rain cap and...

  • Page 25

    25 8. Operate heater through 1 heat cycle to ensure combustion-air and vent pipes are properly connected to concentric vent termination connections. Figure g. Multi-concentric vent terminations when two or more appliances are directed vented with concentric vent terminations near each other, each ap...

  • Page 26

    26 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 and cpvc piping materials that you are about to use. C....

  • Page 27

    27 b. Deburring use a knife, plastic pipe deburring tool, or file to remove burrs from the end of small diameter pipe. Be sure to remove all burrs from around the inside as well as the outside of the pipe. A slight chamfer (bevel) of about 10°-15° should be added to the end to permit easier insertio...

  • Page 28

    28 controls and switches this model is provided with three pressure switches. These switches are essential to the safe and proper operation of the unit. All switches are wired in series. The controller is set up to shut the unit down whenever there is a failure of any of the switches. It is importan...

  • Page 29

    29 caution label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. Power vent wiring schematic - figure 24. This water heater is polarity sensitve. Before applying electricity to this heater be...

  • Page 30

    30 warning: if you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner ...

  • Page 31: Temperature Regulation

    31 the water temperature is controlled using the temperature control on the display at the front of the unit (see figure 1). This control utilizes a temperature probe to determine the tank temperature. The primary temperature probe is located at the top of the tank. The temperature may be adjusted f...

  • Page 32

    32 using the electronic controller 1. Overview interaction with the water heater controller is done through an up, a down, and three operation buttons. These buttons are illustrated to the right. Operation of the three lower buttons is defined immediately above them on the screen. The [up] and [dn] ...

  • Page 33

    33 3. Adjusting the operating set point the operating set point of this water heater determines the regulated temperature for the water in the tank. This parameter is adjusted in the temperature menu. Items in this menu allow you to monitor different temperature readings in the tank along with adjus...

  • Page 34

    34 3. Changing the display units the display interface to the heater has the option of selecting between degrees fahrenheit and degrees celsius for temperature displays. This can be found in the “display settings” menu. Also in this menu, you may adjust how the backlight operates and the contrast of...

  • Page 35

    35 action: to get to the current fault information screen, press menu. Display: action: press the down button to highlight "current fault" and press select. Display: action: press the down button for more information. Display: 6. Viewing the fault history the controller for this water heater will st...

  • Page 36: For Your Information

    36 for your information start up conditions smoke/odor it is not uncommon to experience a small amount of smoke and odor during the initial start-up. This is due to burning off of oil from metal parts, and will disappear in a short while. Thermal expansion water supply systems may, because of such e...

  • Page 37: Periodic Maintenance

    37 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 38

    38 installed in suitable area: to insure sufficient ventilation and combustion air supply, proper clearances from the water heater must be maintained. See “facts to consider about location” section. Combustible materials such as clothing, cleaning materials, or flammable liquids, etc. Must not be pl...

  • Page 39: Leakage Checkpoints

    39 leakage checkpoints never use this water heater unless it is completely filled with water. To prevent damage to the tank, the tank must be filled with water. Water must flow from the hot water faucet before turning “on” gas to the water heater. A *condensation may be seen on pipes in humid weathe...

  • Page 40: Troubleshooting Guidelines

    40 problems not enough hot water 1.) blower will not run. A. “on/off” control switch turned off. Turn switch to the “on” position. B. Blower unplugged. Plug blower back into 115 vac outlet. C. No power at outlet. Repair service to outlet. D. Thermostat defective. Replace thermostat. E. Control harne...

  • Page 41: Notes

    41 notes.

  • Page 42: Notes

    42 notes.

  • Page 43

    43 limited warranty a. O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this water heater. 1. The tank if the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water ther...

  • Page 44

    44 500 tennessee waltz parkway, ashland city, tn 37015 phone: 800-527-1953 fax: 800-433-2515 www.Hotwater.Com.