1 a division of a.O. Smith corporation mc bee, south carolina place these instructions adjacent to heater and notify owner to keep for future reference. Printed in u.S.A. 1104 part no. 196145-001 cyclone xhe ® model bth 120-250(a) series 970 and 973 commercial gas water heater gas-fired power burner...
2 these designs comply with the latest version of the american national standard for gas water heaters, volume iii, ansi z21.10.3 / csa 4.3 m 98 as an automatic circulating tank water heater, and automatic storage water heaters. Detailed installation diagrams are found in this manual. These diagrams...
3 danger this water heater is equipped with an adjustable thermostat to control water temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/ or death. The temperature at which injury occurs varies with the...
4 that the water temperature be set for the lowest temperature which satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater and minimize scale formation. Setting the water heater temperature at 120°f/49°c will reduce the risk of scalds. Some st...
5 • do not cover the temperature & pressure relief valve. • do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • do obtain new labels from a.O. Smith for placement on the blanket directly over the existing labels. Locating the heater warning ...
6 less than 100 square inches (645 cm²). If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors. When directly communicating with the outdoors through vertical ducts, two permanent openings, located in the above manner, sha...
7 figure 5 *note: bth 250 uses tee on air intake terminal direct vent horizontal vent figure 6 do not terminate exhaust over public area where condensate or vapor can cause nuisance or hazard. On direct vent installations, exhaust vent hood must be located 1' (30.5cm) minimum from any opening in bui...
8 transmitted into the living spaces. Important the vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the national fuel gas code, ansi z223.1/nfpa 54 and for canadian installations consult the canadian installation codes and can/cga ...
9 figure 9 important when locating the terminals on a sidewall, the following specifications pertaining to terminal location must be followed. 1. The intake vent terminal and the exhaust vent terminal must terminate on the same exterior wall and must be located at a minimum of 24" (61cm) from the ve...
10 figure 12 installation of vent system warning the optional intake venting arrangement and the exhaust venting arrangement must be installed to run directly to the outdoors and not in any way be connected to another venting system (i.E. Furnace, dryers or space heaters). It is crucial that the ven...
11 d. Know your own qualifications or those of your contractor. The solvent welding technique of joining pvc, pvc cellular core, abs or cpvc pipe is a specialized skill just as any other pipe fitting technique. E. Closely supervise the installation and inspect the finished job before start-up. F. Co...
12 blocked outlet prover switch (see figure 13) the blocked outlet prover switch is set up to shut the unit off when a build- up of positive pressure in the exhaust vent pipe occurs. This switch is a positive pressure switch that requires an increase in pressure to change the electrical contacts fro...
13 connection of gas pipe 1. When connecting gas pipe to unit, apply wrench to flange only. Note: do not use wrench on gas valve or gas bracket. See figure 15. 2. Perform the gas leak test any time work is done on a gas system to avoid the possibility of fire or explosion with property damage, perso...
14 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagrams on pages 23 through 28 in back of manual for suggested piping arrangements. Heater wiring if any of the ...
15 operation sequence of operation typical control/appliance operating sequence 1. When the control is initially powered, it enters a test mode and will display the current software revision (example "104") for approximately 2 seconds, then "88.8" and all the led's will illuminate for approximately ...
16 no low voltage (figure 20) 24v ac led off no low voltage, 24v ac led off figure 20 temperature probe fault (figure 21) water temp led flashing temperature probe fault, water temp led flashing figure 21 this condition accommodates multiple failure modes. To more accurately determine the cause of f...
17 display flashes “05” when button is pressed: display flashes “15” when button is pressed: display flashes “25” when button is pressed: eco switch open (figure 22) eco led flashing: eco switch open, eco led flashing figure 22 control bad (figure 23) all leds flashing: possible cause remedy 1. This...
18 adjustment procedure initial start-up a minimum gas supply pressure of 5.0" (1.25 kpa) w.C. (4.5" or 1.12 kpa) on bth 150 and 199) for natural gas (11.0" or 2.74 kpa w.C. For l.P. Gas) is required before making any adjustment to the gas control pressure regulator attempts to adjust the regulator ...
19 for your safety read before operating warning: if you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life..
20 warning under no circumstances should the input exceed the rate shown on the heater rating plate. Overfiring could result in damage or sooting of the heater. Cathodic protection caution hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long peri...
21 figure 25 to dissolve and remove the more stubborn mineral deposits, a.O. Smith un•lime® professional delimer should be used. A.O. Smith un•lime® professional delimer is an easy to handle patented food grade acid formulated specifically for lime scale removal from all types of water using equipme...
22 to inspect or replace an anode: the anodes on this heater are easily accessible from the top of the heater making replacement simple and quick. 1. Turn the heater off per the lighting instructions. Connect a hose to the drain valve . Locate the hose's discharge in an area where hot water will not...
23 one temperature - one heater horizontal storage tank forced circulation with or without building recirculation danger temperature setting should not exceed safe temperature at fixtures. See water temperature control warning on page 4. If higher preheat temperatures are necessary to obtain adequat...
24 * pipe relief valve to open drain. Note: if tempered water is recirculated, return line should be connected at point “a”. Install in accordance with local codes. Two temperature - one heater high temperature with or without building recirculation danger temperature setting should not exceed safe ...
25 two temperature - two heaters high temperature with or without building recirculation two temperature - three heaters (two pre-heaters/one booster heater) with or without building recirculation must be identical heaters for multiple heater installation see manifold kit specifications, page 28. Ca...
26 * pipe relief valve to open drain ** 140°f (60°c)to 150°f (66°c) should be maximum water temperature maintained in the pre-heaters. 120°f (49°c) should be the minimum temperature of water in the pre- heaters. Connect circulating line from fixtures, if used, to cold water supply line of pre-heater...
27 note 1: toggle switch controls 180°f (82°c) water circulation. Install on or close to dishwasher. Toggle switch must be closed (on) during the rinse operation and open (off) when dishwasher is not operating or when on long standby. Note 2: install line temperature control in an uninsulated tee be...
28 manifold kits precision cut type “l” all copper a.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Unions shown ...
29 checklist and service information important the installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re-fired after a prolonged shutdown. However, it is recommended that only qualified servicemen, using appropriate test ...
30 motor will not run 1. Confirm 120v ac to the controller. Also, to verify correct polarity, check for 120 v ac between hot supply and ground. If there is no voltage, check for a loose connection where it connects to the controller. 2. If there is 120 volts to the controller, check for loose connec...
31 model bth 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 ...
32 a.O. Smith water products company 5621 w. 115th street • alsip, illinois 60803 phone: 1-800-433-2545 • fax: 1-800-433-2515 www.Hotwater.Com • e-mail: parts@hotwater.Com.
