A.O. Smith BTN 120 THRU 400/A Series - Manual

6 The exhaust inducer is equipped with a gravity controlled damperto reduce the amount of heat loss through the flue, improvingefficiency. EXHAUST INDUCER FIGURE 4 CIRCULATING PUMP A circulating pump is used when a system requires a circulatingloop or there is a storage tank used in conjunction with...

8 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 DRAWNINTO THE ROOM THROUGH THE CHIMNEY, CAUSING POORCOMBUSTION. SOOTING MAY ...

9 TYPE B GAS VENT Multiple Gas Fired Tank-Type Heaters When venting multiple tank type heaters using Type Bvent pipe, follow the installation diagram (figure 4) andtables below which give sizing and data based uponNFPA 54/ANSI Z223. 1992. TABLE 6. TECHNICAL DATA VENTING MODEL BTN-120Input: 120,000 B...

11 WATER LINE CONNECTIONS This manual provides detailed installation diagrams (see pages13-19 of this manual) for typical methods of application for thewater heater(s). The water heater may be installed by itself, or with a separatestorage tank, on both single and two-temperature systems.When used w...

12 INSTALLATION DIAGRAMS-TOP INLET/OUTLET USAGE Use of the top inlet water connection requires installation of aninlet dip tube (refer to figure 8). The tube is supplied in theheater. Follow caution labels if applying heat to this fitting. Donot allow pipe dope to contact the plastic tube during ins...

13 VERTICAL STORAGE TANK AND FORCED CIRCULATION 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 25. IF HIGHER PREHEAT TEMPERATURES ARENECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SC...

14 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 25. IF HIGHER PREHEAT TEMPERATURES ARENECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES....

15 INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE 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 25. IF HIGHER PREHEAT TEMPERATURES ARENECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-S...

19 MODEL DIMENSION “A” BTN-120 63” BTN-154 68” BTN-180 72” BTN-199 72” BTN-200/A 72” BTN-250/A 72” BTN-275/A 72” BTN-310/A 73” BTN-366/A 73” BTN-400/A 73” MANIFOLD KITS TWO UNIT MANIFOLD KIT (PART NO. 78692) THREE UNIT MANIFOLD KIT (PART NO. 78593) FOUR UNIT MANIFOLD KIT (PART NO. 78694)

20 HEATER WIRING All electrical work must be installed in accordance with the latestversion of the National Electrical Code ANSI/NFPA No. 70, mustconform to all local code authority having jurisdiction. AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OFELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION. If ...

21 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 3. The figuresshown are for straight lengths of pipe at 0.5 in. W.C. pressuredrop, which is c...

22 correct water column pressure allowing for a nominal pressuredrop through the controls. The minimum gas supply pressure for input adjustment mustnot be less than 4.5" w.c. (1.12 kPa) for natural gas. 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 spressu...

23 SEQUENCE OF OPERATION The following information will describe the Sequence ofOperation for this appliance. 1. Switch power on to unit. 2. Thermostat calls for heat. 3. Ignition Control Board performs diagnostic check on system components. 4. On completion of diagnostics check, the Ignition Contro...

24 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...

25 WATER TEMPERATURE CONTROL DANGER THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLETHERMOSTAT TO CONTROL WATER TEMPERATURE. HOTWATER TEMPERATURES REQUIRED FOR AUTOMATICDISHWASHER AND LAUNDRY USE CAN CAUSE SCALDBURNS RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH INJURY ...

29 Note: If your container does not have the vent cap and vent boss, drill a 3/16" hole in the handle. When you have finisheddeliming you will be able to plug this drilled vent with thestainless steel screw that is supplied with the kit. 2. Remove the container's cap and cut the plastic membrane...

30 REPLACEMENT PARTS, SERVICE HANDBOOKS AND TRAINING AIDS Replacement parts may be ordered through A.O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages forwhere to call or contact the A.O. Smith Water Products Company, Product Service Division, 5621 West 115th Street, ...

31 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...

32 Model BTN 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 ...