A.O. Smith BTR 151 THRU 201/A - Manual

5 p o s s i b i l i t y o f c h a n g i n g t h e o r i e n t a t i o n b y a c c i d e n t a l l yovertightening the inlet supply. Improper orientation of theEliminator may cause temperature buildup issues or spells ofcolder than usual water temperatures. HIGH LIMIT SWITCH The digital thermostat (s...

6 INSTALLATION INSTRUCTIONS REQUIRED ABILITY INSTALLATION OR SERVICE OF THIS WATER HEATERREQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSEDTRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIRSUPPLY, VENTING, GAS SUPPLY AND ELECTRICAL WORK AREREQUIRED. WARNING FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT...

7 CARBONING OR SOOTING OF THE COMBUSTION CHAMBER,BURNERS AND FLUE TUBES AND CREATES A RISK OFASPHYXIATION. Where an exhaust fan is supplied in the same room with aheater, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTOTHE ROOM THROUGH TH...

8 FIGURE 7 • Where a separate vent connection is not available and the vent pipe from the heater must be connected to a commonvent with an oil burning furnace, the vent pipe should enterthe smaller common vent or chimney at a point above thelarge vent pipe. MULTIPLE HEATER MANIFOLD When horizontally...

9 GAS PIPING Contact your local gas service company to ensure that adequategas service is available and to review applicable installationcodes for your area. Size the main gas line in accordance with Table 2. The figuresshown are for straight lengths of pipe at 0.5 in. W.C. pressuredrop, which is co...

10 D o n o t s u b j e c t t h e c o m b i n a t i o n g a s v a l v e t o i n l e t g a spressures of more than 14.0" W.C. - natural gas. A serviceregulator is necessary if higher gas pressures are encountered.Manifold gas pressure in inches of water column is 3.5. The gas pressure specified re...

11 INSTALLATION DIAGRAMS GENERAL The type, size and location of the relief valves must be inaccordance with local codes. The locations of the relief valvesshown in the installation diagrams are typical. The heater has afactory installed high temperature limit switch and temperatureand pressure relie...

12 VERTICAL STORAGE TANK AND FORCED CIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES.SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 20. IF HIGHER PREHEATTEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD ANANTI-SCALD VALVE FOR HOT WATER SUPPLIED...

13 DANGER T E M P E R AT U R E S E T T I N G S H O U L D N O T E X C E E D S A F E U S ETEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROLWARNING ON PAGE 20. IF HIGHER PREHEAT TEMPERATURES ARENECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD ANANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. ...

14 INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE DANGER TEMPERATURE S E T T I N G S H O U L D N O T E X C E E D S A F E U S ETEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROLWARNING ON PAGE 20. IF HIGHER PREHEAT TEMPERATURES ARENECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD ANANTI-SCALD VALVE...

18 OPERATION IMPORTANT A qualified person must perform the initial firing of the heater. Atthis time the user should not hesitate to ask the individual anyquestions which they may have in regard to the operation andmaintenance of the unit. An Operational Checklist is included at the rear of this man...

19 A. This appliance does not have a pilot. It is equippedwith an ignition device which automatically lights theburner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance areafor gas. Be sure to smell next to the floor becausesome gas is heavier than air and w...

20 set for 120° to 180°F water temperature, but 120°F is the recommended starting point. It is suggested the dial be placedon the lowest setting which produces an acceptable hot watersupply. This will always give the most energy efficient operation.The temperature control has a 4°F (2°C) fixed diffe...

21 NOTE:1. Remove main burners from unit. 2. Check that burner venturi and ports are free of foreign debris. 3. Clean burners with bristle brush and/or vacuum cleaner - DO NOT distort burner ports or pilot location. 4. Reinstall burners in unit. Make sure front and rear of burners are installed corr...

23 FIGURE 14 DELIMING SOLVENTS A. O. Smith recommends the use of UN•LIME for deliming.UN•LIME is a patented food grade acid which is safe to handleand does not create the harmful fumes which are associatedwith other products. UN•LIME may be obtained from your dealer, distributor or theA. O. Smith Pr...

24 the appliance. The indicator codes on the ignition module areas follows: 1 flash System lockout (retries or cycles exceeded) 2 flashes Pressure switch stuck close 3 flashes Pressure switch stuck open 4 flashes Open on high temperature limit switch (eco) 6 flashes 115 volt AC power reversed (check...

25 SEQUENCE OF OPERATION FLOW CHART Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 18. Switch power on to unit. Thermostat calls for heat. Ignition Control Board performs diagnostic check on components Ignition Control Board sends power to Exhaust In...

26 OPERATIONAL CHECKLIST This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-jobtroubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Becauseimproper piping and wiring can result...

27 Model BTR 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 potablew...