Instruction/ maintenance manual of the product BTH 120-250(A) A.O. Smith
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1 A DIVISION OF A.O. SMITH CORPORA TION Mc BEE, SOUTH CAROLINA PLACE THESE INSTRUCTIONS ADJACENT T O HEA TER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
2 These designs comply with the latest version of the American National S t andard for Gas W ater Heaters, V olume 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.
3 DANGER THIS W A TER HEA TER IS EQUIPPED WITH AN ADJUST ABLE THERMOST A T TO CONTROL W A TER TEMPERA TURE. HOT W A TER TEMPERA TURES REQUIRED FOR A UTOMA TIC DISHW ASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESUL TING IN SERIOUS PERSONAL INJURY AND/ OR DEA TH.
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 W A TER HEA TER TEMPERA TURE A T 120°F/49°C WILL REDUCE THE RISK OF SCALDS.
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.
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 , shall be provided.
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. ON DIRECT VENT INST ALLA TIONS, EXHAUST VENT HOOD MUST BE LOCA TED 1' (30.
8 TRANSMITTED INTO THE LIVING SP ACES. 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/NFP A 54 and for Canadian inst allations consult the Canadian Installation Codes and CAN/CGA B149.
9 FIGURE 9 IMPORT ANT WHEN LOCA TING THE TERMINALS ON A SIDEWALL, THE FOLLOWING SPECIFICA TIONS PERT AINING TO TERMINAL LOCATION MUST BE FOLLOWED. 1. The intake vent terminal and the exhaust vent term.
10 FIGURE 12 INST ALLA TION OF VENT SYSTEM W ARNING THE OPTIONAL INT AKE VENTING ARRANGEMENT AND THE EXHAUST VENTING ARRANGEMENT MUST BE INSTALLED T O RUN DIRECTL Y TO THE OUTDOORS AND NOT IN ANY WA Y BE CONNECTED TO ANOTHER VENTING SYSTEM (I.E. FURNACE, DRYERS OR SP ACE HEA TERS).
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.
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 from normally closed to open.
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.
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.
15 OPERA TION SEQUENCE OF OPERA TION T ypical 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.
16 NO LOW VOL T AGE (Figure 20) 24V AC LED Off NO LOW VOL T AGE, 24V AC LED Off FIGURE 20 TEMPERA TURE PROBE FAULT (Figure 21) W ater T emp LED Flashing TEMPERA TURE PROBE FAUL T , Water T emp LED Flashing FIGURE 21 This condition accommodates multiple failure modes.
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.
18 ADJUSTMENT PROCEDURE INITIAL S T ART -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 (1 1.
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.
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.
21 FIGURE 25 T o 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 equipment.
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 .
23 ONE TEMPERA TURE - ONE HEA TER HORIZONT AL ST ORAGE T ANK FORCED CIRCULA TION WITH OR WITHOUT BUILDING RECIRCULA TION DANGER TEMPERA TURE SETTING SHOULD NOT EXCEED SAFE TEMPERA TURE A T FIXTURES. SEE W A TER TEMPERA TURE CONTROL W ARNING ON PAGE 4.
24 * PIPE RELIEF V A L 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 A T FIXTURES.
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.
26 * PIPE RELIEF V A L VE TO OPEN DRAIN * * 140°F (60°C)TO 150°F (66°C) SHOULD BE MAXIMUM WA TER TEMPERA TURE MAINT AINED IN THE PRE-HEA TERS. 120°F (49°C) SHOULD BE THE MINIMUM TEMPERA TURE OF W A TER IN THE PRE- HEA TERS. CONNECT CIRCULA TING LINE FROM FIXTURES, IF USED, T O COLD W A TER SUPPL Y LINE OF PRE-HEA TER.
27 NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WA TER CIRCULA TION. INST ALL ON OR CLOSE TO DISHW ASHER. TOGGLE SWITCH MUST BE CLOSED (ON) DURING THE RINSE OPERA TION AND OPEN (OFF) WHEN DISHW ASHER IS NOT OPERA TING OR WHEN ON LONG ST ANDBY .
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.
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 .
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 .
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 he.
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.
An important point after buying a device A.O. Smith BTH 120-250(A) (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought A.O. Smith BTH 120-250(A) yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data A.O. Smith BTH 120-250(A) - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith BTH 120-250(A) you will learn all the available features of the product, as well as information on its operation. The information that you get A.O. Smith BTH 120-250(A) will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith BTH 120-250(A), but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime A.O. Smith BTH 120-250(A).
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith BTH 120-250(A). Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith BTH 120-250(A) along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
