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A.O. Smith BTH 120 - 250 - page 1
1 A DIVISION OF A.O. SMITH CORPORA TION Mc BEE, SOUTH CAROLINA PLACE THESE INSTRUCTIONS ADJACENT TO HEA TER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE. PRINTED IN U.S.A. 2570 1199 Part No. 194119-000 Supersedes P/Ns. 192968-000/193329-000/193311-000 W ARNING: If the information in these instructions is not followed exactly , a fire or explosion ...
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A.O. Smith BTH 120 - 250 - page 2
2 T able 1. RECOVER Y CAP ACITIES - NA TURAL GAS / L.P . ROUGH-IN -DIMENSIONS CYCLONE XHE BTH 120 - 250 Recov er y capacities are based on heater perf or mance at 94% thermal efficiency . TEMPERA TURE RISE - DEGREES °F - GALLONS PER HOUR Model B T U Approx. Input Gallon Capacity 30 40 50 60 70 80 90 1 00 1 10 12 0 1 30 14 0 BTH - 120 125,000 Nat. ...
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A.O. Smith BTH 120 - 250 - page 3
3 Water Line Connections .................................................................. 1 4 Heater Wiring .................................................................................. 1 4 OPERA TION ......................................................................................... 1 5 Sequence of Operation .......................... ...
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A.O. Smith BTH 120 - 250 - page 4
4 T emperature Time to Produce 2nd & 3rd Setting Degree Burns on Adult Skin 180°F Nearly instantaneous 170°F Nearly instantaneous 160°F About 1/2 second 150°F About 1-1/2 seconds 140°F Less than 5 seconds 130°F About 30 seconds 120°F More than 5 minutes FIGURE 1 V alves for reducing point-of-use temperature by mixing cold and hot water a ...
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A.O. Smith BTH 120 - 250 - page 5
5 DISHW ASHING MACHINE REQUIREMENT All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow pressures between 15 and 25 pounds per square inch. Flow pressures above 25 pounds per square inch, or below 15 pounds per square inch, will result in improperly sanitized dishes. Where pressure ...
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A.O. Smith BTH 120 - 250 - page 6
6 UNCONFINED SP ACE In buildings of conventional frame, brick or stone construction, unconfined spaces may provide adequate air for combustion and ventilation. If the unconfined space is within a building of tight construction (buildings using the following construction: weather stripping, heavy insulation, caulking, vapor barrier , etc.), air for ...
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A.O. Smith BTH 120 - 250 - page 7
7 FIGURE 5 *NOTE: BTH 250 USES TEE ON AIR INT AKE TERMINAL DIRECT VENT HORIZONT AL VENT FIGURE 6 DO NOT TERMINA TE EXHAUST OVER PUBLIC AREA WHERE CONDENSA TE OR V APOR CAN CAUSE NUISANCE OR HAZARD. EXHAUST VENT HOOD MUST BE LOCA TED 1' MINIMUM FROM ANY OPENING IN BUILDING. ...
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A.O. Smith BTH 120 - 250 - page 8
8 IMPORT ANT 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 Z223.1,7.3.4e and 7.8a,b, as follows: 1. Do not terminate the exhaust vent terminal over public area where condensate or vapor can cause nuisance or hazard. 2. For direct vent, the ve ...
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A.O. Smith BTH 120 - 250 - page 9
9 IMPORT ANT WHEN LOCA TING THE TERMINALS ON A SIDEWALL, THE FOLLOWING SPECIFICA TIONS PERT AINING TO TERMINAL LOCA TION 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" (inches) from the vertical centerline of the exhaust vent terminal ...
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A.O. Smith BTH 120 - 250 - page 10
10 FIGURE 12 INST ALLA TION OF VENT SYSTEM W ARNING THE OPTIONAL INT AKE VENTING ARRANGEMENT AND THE EXHAUST VENTING ARRANGEMENT MUST BE INST ALLED TO RUN DIRECTLY TO THE OUTDOORS AND NOT IN ANY W A Y BE CONNECTED TO ANOTHER VENTING SYSTEM (I.E. FURNACE, DRYERS OR SP ACE HEA TERS). IT IS CRUCIAL THA T THE VENTING ARRANGEMENT BE KEPT SEP ARA TE FROM ...
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A.O. Smith BTH 120 - 250 - page 11
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 . Contact the manufacturer, supplier , or competent ...
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A.O. Smith BTH 120 - 250 - page 12
12 tubing must be connected in order for the switch to change the electrical contacts. The controller requires that the electrical contacts on this air flow switch be open before it will allow the blower to come on. 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 posit ...
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A.O. Smith BTH 120 - 250 - page 13
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 A VOID THE POSSIBILITY OF FIRE OR EXPLOSION WITH PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. FIGURE 15 The Gas Le ...
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A.O. Smith BTH 120 - 250 - page 14
14 HEA TER WIRING IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH 105°C WIRE OR ITS EQUIV ALENT , EXCEPT IN THE BURNER HOUSING. IN THIS CASE USE 200°C WIRE. THE COMPUTER CONTROL REQUIRES A SOURCE OF ST ABLE CLEAN ELECTRICITY FOR PROPER OPERA TION. INSTALLING THE HEA TER ON A BRANCH CIRCUIT THA ...
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A.O. Smith BTH 120 - 250 - page 15
15 OPERA TION SEQUENCE OF OPERA TION T ypical Control/Appliance Operating Sequence 1. When the control is powered, it should first display 0, then the input line voltage (120), the calibration setting (12), then the actual water temperature in the tank. 2. If the control determines that the actual water temperature inside the tank is be ...
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A.O. Smith BTH 120 - 250 - page 16
16 ERROR CODES The following Error Codes are external to the controller . 01 Pressure Switch Fail On, should be Off 1 1 Pressure Switch Fail Off, should be On 02 Ignition Fail after 3 attempts 04 ECO Open 05 T emperature Probe Open 15 T emperature Out of Bounds < 30 degrees 25 T emperature Out of Bounds > 220 degrees The following Error Codes ...
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A.O. Smith BTH 120 - 250 - page 17
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 indicates the control has 1. Press bu ...
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A.O. Smith BTH 120 - 250 - page 18
18 ADJUSTMENT PROCEDURE INITIAL ST ART-UP A minimum gas supply pressure of 5.0" W .C. (4.5" on BTH 150 and 199) for natural gas (1 1.0" W.C. for L.P . Gas) is required before making any adjustment to the gas control pressure regulator Attempts to adjust the regulator during periods of low gas supply pressure could result in overfirin ...
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A.O. Smith BTH 120 - 250 - page 19
19 FOR YOUR SAFETY READ BEFORE OPERA TING W ARNING: If you do not follow these instructions exactly , a fire or explosion may result causing property damage, personal injury or loss of life. ...
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A.O. Smith BTH 120 - 250 - page 20
20 W ARNING UNDER NO CIRCUMST ANCES SHOULD THE INPUT EXCEED THE RA TE SHOWN ON THE HEA TER RA TING PLA TE. OVERFIRING COULD RESUL T IN DAMAGE OR SOOTING OF THE HEA TER. CA THODIC PROTECTION CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WA TER SYSTEM SERVED BY THIS HEA TER THA T HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALL Y TWO WEEKS OR MO ...
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A.O. Smith BTH 120 - 250 - page 21
21 FIGURE 25 T o dissolve and remove the more stubborn mineral deposits, A.O. Smith UNLIME® Professional Delimer should be used. A.O. Smith UNLIME® Professional Delimer is an easy to handle patented food grade acid formulated specifically for lime scale removal from all types of water using equipment. Available in 1 gallon (part no. 4763) a ...
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A.O. Smith BTH 120 - 250 - page 22
22 T o 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 cause any damage or injury . 2. Open the dr ...
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A.O. Smith BTH 120 - 250 - page 23
23 ONE TEMPERA TURE - ONE HEA TER HORIZONT AL ST ORA GE T ANK FORCED CIRCULA TION WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE AT FIXTURES. SEE W A TER TEMPERA TURE CONTROL WARNING ON P AGE 4. IF HIGHER PREHEA T TEMPERA TURES ARE NECESSARY TO OBTAIN ADEQUA TE BOOSTER OUTPUT , ADD AN ANTI-SC ...
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A.O. Smith BTH 120 - 250 - page 24
24 * PIPE RELIEF V AL VE TO OPEN DRAIN. NOTE: IF TEMPERED WA TER IS RECIRCULA TED, RETURN LINE SHOULD BE CONNECTED A T POINT A. INST ALL IN ACCORDANCE WITH LOCAL CODES. TWO TEMPERA TURE - ONE HEA TER HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE AT FIXTURES. SEE WA TE ...
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A.O. Smith BTH 120 - 250 - page 25
25 TWO TEMPERA TURE - TWO HEA TERS HIGH TEMPERA TURE WITH OR WITHOUT BUILDING RECIRCULA TION TWO TEMPERA TURE - THREE HEA TERS (TWO PRE-HEA TERS/ONE BOOSTER HEA TER) WITH OR WITHOUT BUILDING RECIRCULA TION MUST BE IDENTICAL HEA TERS FOR MUL TIPLE HEA TER INST ALLA TION SEE MANIFOLD KIT SPECIFICA TIONS, P AGE 28. CAUTION : IF BUILDING COLD WA TER SU ...
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A.O. Smith BTH 120 - 250 - page 26
26 * PIPE RELIEF V AL VE TO OPEN DRAIN ** 140°F TO 150°F SHOULD BE MAXIMUM WA TER TEMPERATURE MAINT AINED IN THE PRE-HEA TERS. 120°F SHOULD BE THE MINIMUM TEMPERA TURE OF WA TER IN THE PRE- HE A TERS. CONNECT CIRCULA TING LINE FROM FIXTURES, IF USED, TO COLD W A TER SUPPL Y LINE OF PRE-HEA TER. CONNECT CIRCULA TING LINE OF 180°F OR BOOSTED WA T ...
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A.O. Smith BTH 120 - 250 - page 27
27 NOTE 1: TOGGLE SWITCH CONTROLS 180°F WA TER CIRCULA TION. INST ALL ON OR CLOSE TO DISHWASHER. T OGGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERA TION AND OPEN (OFF) WHEN DISHWASHER IS NOT OPERA TING OR WHEN ON LONG ST ANDBY . NOTE 2: INST ALL LINE TEMPERATURE CONTROL IN AN UNINSULA TED TEE BEYOND THE DISHWASHER T AKEOFF IN THE SANITIZING ...
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A.O. Smith BTH 120 - 250 - page 28
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 in piping diagrams are not included in the man ...
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A.O. Smith BTH 120 - 250 - page 29
29 CHECKLIST AND SERVICE INFORMA TION IMPORT ANT 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 equipment, be allowed to service the heater . BE ...
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A.O. Smith BTH 120 - 250 - page 30
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 connections or a locked rotor . If the rotor cannot be ...
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A.O. Smith BTH 120 - 250 - page 31
31 Model BTH Limited W arranty A. O. Smith Corporation, the warrantor , extends the following LIMITED WARRANTY to the owner of this water heater . 1. THE T ANK 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 therein, during the first THREE years af ...
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A.O. Smith BTH 120 - 250 - page 32
32 A.O. SMITH WATER PRODUCTS CO., INC. 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 ...
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