A.O. Smith BTH 120 - 250 Owner's Manual

1A DIVISION OF A.O. SMITH CORPORATIONMc BEE, SOUTH CAROLINAPLACE THESE INSTRUCTIONS ADJACENT TO HEATER ANDNOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.PR

10FIGURE 12INSTALLATION OF VENT SYSTEM WARNINGTHE OPTIONAL INTAKE VENTING ARRANGEMENT AND THE EXHAUSTVENTING ARRANGEMENT MUST BE INSTALLED TO RUN DIRE

11D. Know your own qualifications or those of your contractor. Thesolvent welding technique of joining PVC, PVC cellular core, ABS orCPVC pipe is a sp

12tubing must be connected in order for the switch to change the electricalcontacts. The controller requires that the electrical contacts on this air

13CONNECTION OF GAS PIPE1. When connecting gas pipe to unit, apply wrench to flange only. Note: Donot use wrench on gas valve or gas bracket. See Fi

14HEATER WIRINGIF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCEMUST BE REPLACED, IT MUST BE REPLACED WITH 105°C WIRE OR ITSEQUIVALENT, EXCEP

15OPERATIONSEQUENCE OF OPERATIONTypical Control/Appliance Operating Sequence1. When the control is powered, it should first display 0, then the inpu

16ERROR CODESThe following Error Codes are external to the controller.01 Pressure Switch Fail On, should be Off11 Pressure Switch Fail Off, should be

17Display Flashes 05 when button is pressed:Display Flashes 15 when button is pressed:Display Flashes 25 when button is pressed:ECO SWITCH OPEN

18ADJUSTMENT PROCEDUREINITIAL START-UPA minimum gas supply pressure of 5.0" W.C. (4.5" on BTH 150 and 199) fornatural gas (11.0" W.C.

19FOR YOUR SAFETY READ BEFORE OPERATINGWARNING: If you do not follow these instructions exactly, a fire orexplosion may result causing property damag

2Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P.ROUGH-IN -DIMENSIONS CYCLONE XHE BTH 120 - 250Recovery capacities are based on heater performance a

20 WARNINGUNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATESHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT INDAMAGE OR SOOTING OF THE

21FIGURE 25To dissolve and remove the more stubborn mineral deposits, A.O. SmithUNLIME® Professional Delimer should be used.A.O. Smith UNLIME® Profe

22To inspect or replace an anode:The anodes on this heater are easily accessible from the top of theheater making replacement simple and quick.1. Turn

23ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANKFORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGERTEMPERATURE SETTING SHOULD NOT E

24*PIPE RELIEF VALVE TO OPEN DRAIN.NOTE: IF TEMPERED WATER ISRECIRCULATED, RETURN LINE SHOULD BECONNECTED AT POINT A.INSTALL IN ACCORDANCE WITH LO

25TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATUREWITH OR WITHOUT BUILDING RECIRCULATIONTWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER HEA

26* PIPE RELIEF VALVE TO OPEN DRAIN** 140°F TO 150°F SHOULD BE MAXIMUM WATER TEMPERATUREMAINTAINED IN THE PRE-HEATERS.120°F SHOULD BE THE MINIMUM TEMP

27NOTE 1: TOGGLE SWITCH CONTROLS 180°F WATER CIRCULATION.INSTALL ON OR CLOSE TO DISHWASHER. TOGGLE SWITCH MUST BECLOSED (ON) DURING THE RINSE OPERA

28MANIFOLD KITSPrecision cut type L all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water

29CHECKLIST AND SERVICE INFORMATIONIMPORTANTThe installer may be able to observe and correct certain problems whichmight arise when the unit is put in

3Water Line Connections ... 14Heater Wiring ...

30MOTOR WILL NOT RUN1. Confirm 120V AC to the controller. Also, to verify correct polarity, checkfor 120 V AC between hot supply and ground.If there i

31Model BTH Limited WarrantyA. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.1. THE TA

32A.O. SMITH WATER PRODUCTS CO., INC.5621 W. 115TH STREET  ALSIP, ILLINOIS 60803PHONE: 1-800-433-2545  FAX: 1-800-433-2515 WWW.HOTWATER.COM  E-MAIL

4Temperature Time to Produce 2nd & 3rdSetting Degree Burns on Adult Skin180°F Nearly instantaneous170°F Nearly instantaneous160°F About 1/2 second

5DISHWASHING MACHINE REQUIREMENTAll dishwashing machines meeting the National Sanitation Foundationrequirements are designed to operate with water flo

6UNCONFINED SPACEIn buildings of conventional frame, brick or stone construction, unconfinedspaces may provide adequate air for combustion and ventila

7FIGURE 5*NOTE: BTH 250 USES TEE ONAIR INTAKE TERMINALDIRECT VENTHORIZONTAL VENTFIGURE 6DO NOT TERMINATE EXHAUSTOVER PUBLIC AREA WHERECONDENSATE OR

8IMPORTANTThe vent system must terminate so that proper clearances are maintainedas cited in local codes or the latest edition of the National Fuel Ga

9IMPORTANTWHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWINGSPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BEFOLLOWED.1. The intake vent te