A.O. Smith BTH 400A Operations Instructions

1A DIVISION OF A.O. SMITH CORPORATIONMc BEE, SOUTH CAROLINASTRATFORD (ONTARIO) CANADAwww.hotwater.comPLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND N

10Heater must be protected from freezing downdrafts duringshutdown periods. WARNINGNEVER OPERATE THE HEATER UNLESS IT IS VENTED TOTHE OUTDOORS AND HAS

112. The horizontal centerline of the intake vent terminal may not belocated lower than the horizontal centerline of the exhaust ventterminal (see Fig

122. Drill a pilot hole approximately 1/4" (6 mm) outside of the markedcircle. This pilot hole is used as a starting point for a saws-all orsabre

13VENT PIPE PREPARATION1. INITIAL PREPARATIONA. Make sure the solvent cement you are planning to use isdesigned for the specific application you are a

14HOT SURFACE IGNITERThe Hot Surface Igniter is a device that ignites the main burner byhigh temperature (>1800°F or >982°C). When 120VAC is app

15OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUTMUST BE ISOLATED FROM THE SUPPLY PRESSURE TEST BYCLOSING THE MANUAL GAS SHUTOFF VALVE.BEFORE PLA

162. Toxic chemicals, such as those used for boiler treatment,shall NEVER be introduced into this system.3. This unit may never be connected to any ex

17FIGURE 16.OPERATIONSEQUENCE OF OPERATIONTypical Control/Appliance Operating Sequence1. When the control is powered, it should first display “0”, the

18ERROR CODESThe following Error Codes are external to the controller.01 Pressure Switch Fail On, should be Off11 Pressure Switch Fail Off, should be

19Display Flashes “05” when button is pressed:Display Flashes “15” when button is pressed:Display Flashes “25” when button is pressed:ECO SWITCH OPEN.

2These designs comply with the current edition of the AmericanNational Standard for Gas Water Heaters, Volume III,ANSI Z21.10.3 / CSA 4.3 as an automa

20DO NOT USE THIS HEATER IF ANY PART HAS BEEN UNDERWATER. IMMEDIATELY CALL A QUALIFIED SERVICETECHNICIAN TO INSPECT THE HEATER AND TO REPLACE ANYPART

21LIGHTING AND OPERATION INSTRUCTIONSA. This appliance does not have a pilot. It is equippedwith an ignition device which automatically lights thebur

22 WARNINGUNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEEDTHE RATE SHOWN ON THE HEATER RATING PLATE.OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE

23SEDIMENT REMOVALWaterborne impurities consist of the particles of soil and sandwhich settle out and form a layer of sediment on the bottom ofthe tan

24To dissolve and remove the more stubborn mineral deposits,A.O. Smith UN•LIME® Professional Delimer should be used.NOTE: UN•LIME is not available in

25 CAUTIONBEFORE MANUALLY OPERATING THE VALVE, MAKE SURE THATA DRAIN LINE HAS BEEN ATTACHED TO THE VALVE TO DIRECTTHE DISCHARGE TO AN OPEN DRAIN. FAI

26ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANKFORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGERTEMPERATURE SETTING SHOULD NOT

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

28TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATUREWITH OR WITHOUT BUILDING RECIRCULATIONTWO TEMPERATURE - THREE HEATERS (TWO PRE-HEATERS/ONE BOOSTER HEA

29* PIPE RELIEF VALVE TO OPEN DRAIN** 140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM WATERTEMPERATURE MAINTAINED IN THE PRE-HEATERS.120°F (49°C) SHOULD

3 DANGERTHIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLETHERMOSTAT TO CONTROL WATER TEMPERATURE. HOTWATER TEMPERATURES REQUIRED FOR AUTOMATICDISHWASHE

30NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATERCIRCULATION. INSTALL ON OR CLOSE TO DISHWASHER.TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE RIN

31MANIFOLD KITSPrecision cut type “L” all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water

32CHECKLIST AND SERVICE INFORMATIONIMPORTANTThe installer may be able to observe and correct certain problemswhich might arise when the unit is put in

33MOTOR WILL NOT RUN1. Confirm 120V AC to the controller. Also, to verify correct polarity,check for 120 V AC between hot supply and ground.If there i

34Model BTH Limited WarrantyA. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.1. THE TA

35NOTES

36A DIVISION OF A.O. SMITH CORPORATIONMc BEE, SOUTH CAROLINASTRATFORD (ONTARIO) CANADAwww.hotwater.com

4Horizontal Sidewall Venting Vertical Rooftop Venting“AT A GLANCE” BTH 300/400 QUICK INSTALLATION TIPS

5The temperature may be adjusted from 80°F/27°C to 180°F/82°C.The thermostat was adjusted to 120°F/49°C before the heaterwas shipped from the factory.

6THE HEATER SHALL BE LOCATED OR PROTECTED SO IT ISNOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.DO NOT LOCATE THE HEATER WHERE NOISE FROM THEEXHA

7CLEARANCESThese heaters are approved for installation on combustible flooringin an alcove when the minimum clearances from any combustionconstruction

8US DIRECT VENTCANADIAN DIRECT VENTFIGURE 5. CAUTIONTO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THEAIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM

9US HORIZONTAL VENTCANADIAN HORIZONTAL VENTFIGURE 6. CAUTIONTO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THEAIR INTAKE IN WINDY/COLD AREAS, T