A.O. Smith 650 Operations Instructions

1MODELS BTP(V)-540A, 650A AND 740ACOMMERCIAL GAS, GLASS-LINED, TANK-TYPE LOW NOx WATER HEATERCONSERCONSERCONSERCONSERCONSERVVVVVAAAAATIONISTTIONISTTIO

101. Shall be located not less than 12” (304.8 mm) above grade.2. Shall be located not less than 3 (.9144 m) feet horizontallyfrom and not less than 3

115. Attach a properly sized length of Selkirk Metalbestos modelPS or model G venting to the exhaust vent adapter using theinner vee bands, see Figure

12TABLE 9AMAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR(Based upon a Pressure Drop of 0.5 inch Water Columnand 0.5 Specific Gravity Gas and m

13ROBERTSHAW® 7000 DERHC GAS CONTROL VALVEFIGURE 10.WATER LINE CONNECTIONSFollowing are detailed installation diagrams for typical methodsof applicati

14INSTALLATION DIAGRAMSONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANKFORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGERIF BUILDING

15TWO TEMPERATURE - ONE HEATER HIGH TEMPERATUREWITH OR WITHOUT BUILDING RECIRCULATIONTWO TEMPERATURE - TWO HEATERS HIGH TEMPERATUREWITH OR WITHOUT BUI

16CAUTION: IF BUILDING COLD WATER SUPPLY HAS ABACKFLOW PREVENTER, CHECK VALVE OR WATERMETER WITH CHECK VALVE, PROVISIONS FORTHERMAL EXPANSION OF WATER

17TWO TEMPERATURE - ONE HEATER HIGH TEMPERATUREWITH RECIRCULATION OF SANITIZING LOOPCAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOWPREVENTER, CH

18MANIFOLD KITSPrecision cut type “L” all copper A. O. Smith manifold kits assurewater flow balance of all units. Without this balance, the fullwater

19HEATER WIRINGIF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THEAPPLIANCE MUST BE REPLACED, IT MUST BE REPLACEDWITH 105°C WIRE OR ITS EQUIVALENT, EXCEP

2FOREWORDThe design of the BTP 540A through 740A models complieswith ANSI Z21.10.3/CSA 4.3 as an automatic circulating tankand an automatic instantane

20FIGURE 11.

21FIGURE 12.

22FOR YOUR SAFETY READ BEFORE LIGHTING1. Remove thermostat control cover.2. Set thermostat to lowest setting.3. Turn burner switch to “OFF”.WARNING:

23SEQUENCE OF OPERATION– Power on.– Heater in standby mode.– Thermostat calls for heat.– Blower motor starts.– Blower operation closes the normally op

241. Check gas line pressure with a manometer.Set initial gas line pressure at 9-10” w.c. before turning theheater “ON”.Read gas line pressure and gas

25PREMIX LOW NOx BURNER - EXPLODED VIEW FOR BTP MODELSFIGURE 13.

26PREMIX LOW NOx BURNER - EXPLODED VIEW FOR BTPV MODELSFIGURE 14.

27GENERAL INFORMATIONPOWER BURNERThe initial start-up procedure of the gas power burner is providedon page 18 thru 21. Refer to Figure 12, burner expl

28DRAININGThe heater must be drained if it is to be shut down and exposedto freezing temperatures. Maintenance and service proceduresmay also require

29ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND PRESSURERELIEF VALVE. THIS IS NOT A SOLUTION AND CAN CREATE AHAZARDOUS SITUATION.CIRCULATING PUMPThe wat

3are different from natural gas models. A natural gas heaterwill not function safely on LP gas and no attempt should bemade to convert a heater from

302. Check the fuses.• The electrical disconnect switch usually contains fuses.3. The capacity of the heater may have been exceeded by alarge demand f

31Refer to the SEQUENCE OF OPERATION and burner explodedview, see Figure 12 and the wiring diagram located on page 20,and the troubleshooting section

32• Do not proceed to Step 5 unless 24V is detected at “24V”terminal of the Honeywell Module.5. As soon as the pilot gas valve is energized, check for

33Model BTP(V) Limited WarrantyA.O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.1. THE

34NOTES

35NOTES

36REPLACEMENT PARTS5621 W. 115TH STREET, ALSIP, IL 60803Phone: 800-433-2545 Fax: 800-433-2515www.aosmithwaterheaters.com E-Mail: [email protected]

4and sodium chloride (water softener salt), waxes, and processchemicals are typical compounds which are potentially corrosive.Do not store products of

5Continued manual resetting of high limit control, preceded byhigher than usual water temperature is evidence of high limitswitch operation. The foll

6Units, which are to be installed on combustible flooring, mustbe supported by a full layer of hollow concrete blocks, from8” (203.2 mm) to 12” (304.8

7Heater must be protected from freezing downdrafts duringshutdown periods.The BTP 540A, 650A and 750A water heater are classified as acategory I appli

8Refer to Table 2 for limitations of venting system design forhorizontal venting.TABLE 2BTPV-540A-740AFlue Outlet Dia. (Inches/mm) 9” (228.6)Flue Red

9DIRECT VENTING - FOR BTPV MODELSAll exhaust vent terminal, flue reducer, and intake vent terminalare supplied with any unit intended for direct venti