A.O. Smith BTH 120-250(A) - Manuals

5 • Do not cover the temperature & pressure relief valve. • Do not cover the instruction manual. Keep it on the side of thewater heater or nearby for future reference. • D o obtain new labels from A.O. Smith for placement on theblanket directly over the existing labels. LOCATING THE HEATER WARNI...

6 less than 100 square inches (645 cm²). If the confined space is within a building of tight construction, air for combustionand ventilation must be obtained from outdoors. When directly communicatingwith the outdoors through vertical ducts, two permanent openings, locatedin the above manner, shall ...

7 FIGURE 5 *NOTE: BTH 250 USES TEE ON AIR INTAKE TERMINAL DIRECT VENT HORIZONTAL VENT FIGURE 6 D O N O T T E R M I N AT E E X H A U S TO V E R P U B L I C A R E A W H E R EC O N D E N S AT E O R VA P O R C A NCAUSE NUISANCE OR HAZARD. ON DIRECT VENT INSTALLATIONS, EXHAUST VENTHOOD MUST BE LOCATED 1'...

8 TRANSMITTED INTO THE LIVING SPACES. IMPORTANT The vent system must terminate so that proper clearances are maintainedas 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 CanadianInstallation Codes and CAN/CGA B14...

9 FIGURE 9 IMPORTANT WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE FOLLOWINGSPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BEFOLLOWED. 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 v...

11 D. Know your own qualifications or those of your contractor. The solvent welding technique of joining PVC, PVC cellular core, ABS orCPVC 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. Con...

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 apositive pressure switch that requires an increase in pressure to changethe electrical contacts from n...

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 AGAS SYSTEM TO AVOID THE POSSIBILITY OF FIRE OR EXPLOSIONWITH PROPERTY DAMAGE, PERSONAL...

14 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valvemust be installed. Please refer to installation diagrams on pages 23through 28 in back of manual for suggested piping arrangements. HEATER WIRING IF ANY OF THE OR...

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 approximately2 seconds, then "88.8" and all the LED's will illuminate for...

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 pressureregulator Attempts to adjust the r...

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 RATESHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULTIN DAMAGE OR SOOTING OF THE HEATER. CATHODIC PROTECTION CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVEDBY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD ...

22 To 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 the heater off per the lighting instructions. Connect a hose to the drain valve . Locate the hose's discharge in an area where hot waterwill not c...

23 ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEEDSAFE TEMPERATURE AT FIXTURES. SEE WATERTEMPERATURE CONTROL WARNING ON PAGE 4. IFH I G H E R P R E H E AT T E M P E R AT U R E S A R ENECESSARY...

24 * PIPE RELIEF VALVE TO OPEN DRAIN. N O T E : I F T E M P E R E D WAT E R I S RECIRCULATED, RETURN LINE SHOULD BECONNECTED AT POINT “A”. INSTALL IN ACCORDANCE WITH LOCALCODES. TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT...

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 F O R M U LT I P L E H E AT E R I N S TA L L AT I O N S E E M A N I F O L D K...

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 waterheating 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...

29 CHECKLIST AND SERVICE INFORMATION IMPORTANT The installer may be able to observe and correct certain problems whichmight arise when the unit is put into operation or when it is re-fired after aprolonged shutdown. HOWEVER, it is recommended that only qualifiedservicemen, using appropriate test equ...

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 ...