Ao-smith BTR 151 THRU 201/A User Manual

1MODELS BTR 151 THRU 201/ACOMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTYPLACE THES

10Do not subject the combination gas valve to inlet gaspressures of more than 14.0" W.C. - natural gas. A serviceregulator is necessary if highe

11INSTALLATION DIAGRAMSGENERALThe type, size and location of the relief valves must be inaccordance with local codes. The locations of the relief val

12VERTICAL STORAGE TANK AND FORCED CIRCULATION DANGERTEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES.SEE WATER TEMPERATURE CONT

13 DANGERTEMPERATURE SETTING SHOULD NOT EXCEED SAFE USETEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROLWARNING ON PAGE 20. IF HIGHER PREHEAT T

14INSTALLATION DIAGRAMS-SIDE INLET/OUTLET USAGE DANGERTEMPERATURE SETTING SHOULD NOT EXCEED SAFE USETEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE C

15ONE OR TWO TEMPERATURE - ONE HEATERS,HIGH TEMPERATURESTORAGE WITH OR WITHOUT RECIRCULATIONHEATER WITH OR WITHOUT MIXING VALVEHEATER WITH MIXING VALV

16TWO TEMPERATURE - TWO PRE-HEATERS WITH MIXING VALVE OR BOOSTERHEATER WITH OR WITHOUT BUILING RECIRCULATIONTWO PRE-HEATERS WITH MIXING VALVETWO PRE-H

17MEDIUM TEMPERATURE - ONE HEATER WITH AUXILIARY STORAGE TANK FORCEDCIRCULATION WITH OR WITHOUT BUILDING RECIRCULATIONVERTICAL STORAGE TANKHORIZONTAL

18OPERATIONIMPORTANTA qualified person must perform the initial firing of the heater. Atthis time the user should not hesitate to ask the individual

19A. This appliance does not have a pilot. It is equippedwith an ignition device which automatically lights theburner. Do not try to light the burne

2FOREWORDThese designs comply with ANSI Z21.10.3 as a Booster typewater heater.Detailed installation diagrams are found in this manual. Thesediagrams

20set for 120° to 180°F water temperature, but 120°F is therecommended starting point. It is suggested the dial be placedon the lowest setting which

21NOTE: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 v

22RELIEF VALVEAt least once a year, the temperature and pressure relief valveshould be checked to ensure that it is in operating condition. Liftthe l

23 FIGURE 14DELIMING SOLVENTSA. O. Smith recommends the use of UN•LIME for deliming.UN•LIME is a patented food grade acid which is safe to handleand

24the appliance. The indicator codes on the ignition module areas follows:1 flash System lockout (retries or cycles exceeded)2 flashes Pressure switc

25SEQUENCE OF OPERATION FLOW CHARTDescription of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 18.Switch power ont

26OPERATIONAL CHECKLISTThis checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-jobtroubleshoo

27Model BTR Limited WarrantyA. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.1. THE TA

28A.O. SMITH WATER PRODUCTS COMPANY5621 W. 115TH STREET • ALSIP, ILLINOIS 60803PHONE: 1-800-433-2545 • FAX: 1-800-433-2515www.aosmithwaterheaters.com

3GENERAL SAFETY INFORMATIONPRECAUTIONSDO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDERWATER. Immediately call a qualified service technician to i

4OPERATION OF THESE FANS CAN PRODUCE A NEGATIVEDRAFT IN THE AREA OF THE WATER HEATER PREVENTINGTHE PRODUCTS OF COMBUSTION FROM EXHAUSTINGTHROUGH THE C

5possibility of changing the orientation by accidentallyovertightening the inlet supply. Improper orientation of theEliminator may cause temperature

6INSTALLATION INSTRUCTIONSREQUIRED ABILITYINSTALLATION OR SERVICE OF THIS WATER HEATERREQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSEDTRADESMAN IN TH

7CARBONING OR SOOTING OF THE COMBUSTION CHAMBER,BURNERS AND FLUE TUBES AND CREATES A RISK OFASPHYXIATION.Where an exhaust fan is supplied in the same

8 FIGURE 7• Where a separate vent connection is not available and thevent pipe from the heater must be connected to a commonvent with an oil bur

9GAS PIPINGContact your local gas service company to ensure that adequategas service is available and to review applicable installationcodes for your