A.O. Smith BTP(V)-540A, 650A, 740A warranty General Information, Maintenance

GENERAL INFORMATION

POWER BURNER

The initial start-up procedure of the gas power burner is provided on page 18 thru 21. Refer to Figure 12, burner exploded view for burner components location.

The sequence of operation of the power burner is provided on page 15. For detailed Power Burner Operation, Maintenance and Troubleshooting refer to the separate Power Burner Manual provided with this water heater.

THERMOSTAT

It is suggested the thermostat be turned to the lowest setting, which satisfies the hot water requirements of the system. This helps minimize scale formation in the heater.

HIGH LIMIT

The high limit (not adjustable) is factory set to cutout at 205°F (96°C). The high limit switch must be manually reset by depressing the reset button on front of the control when water temperature drops to about 180°F (82°C).

GAS AND AIR SUPPLY SPECIFICATIONS TABLE 10

Model	BTP(V)-540A	BTP(V)-650A	BTP(V)-750A
Min. Dynamic Gas
Supply Line	8” w.c. (2 kPa) When heater is ON
Pressure
Max. Static Gas
Supply Line	14” w.c. (3.5 kPa) When heater is OFF
Pressure
Gas Manifold	4.7”w.c. (1.1 kPa)	4.7”w.c. 1.1 kPa)	4.7”w.c. (1.1 kPa)
Pressure	(Ref.)*	(Ref.)*		(Ref.)*
Gas Orifice Size	1/2”	11/16”		N/A
Air Inlet Damper	3**	4.5**		5.6**
Dial Setting
Combustion	Flue Gas O2: 5 - 6.5%**
Emissions
	(or CO2 reading 8 - 9%)
Range

*Note: Flue gas excess O2 below 3% may cause combustion chamber premature failure; flue gas excess O2 above 7% may cause rough operation or incomplete combustion. Final

manifold pressure settings should be based on flue O2/CO2 reading!

**Note: Air inlet damper setting needs to be adjusted at field for direct vent and/or high elevation installations.

MAINTENANCE

to the following table. A periodic inspection of the venting system should be made. Where used the water heating system circulating pump should be oiled.

MAINTENANCE SCHEDULE

Following are the instructions for performing some of the recommended maintenance. Power burner inspection and adjustment should be performed by a competent technician.

MAINTENANCE SCHEDULE

Component	Operation	Interval	Required
	Sediment
Tank	Removal	Monthly	Flushing
	Lime Scale		UN-LIME®
	Removal	Semi-Annually	Delimer
Relief Valve	Inspect	Semi-Annually
			SAE No. 20
Circulating Pump(1)	Oiling	Four Months	non-detergent
			motor oil
	Clean Inlet
Power Burner Blower	Screen and	As Required	Soft Brush
	Blower Wheel
Power Burner and
Ignition Device(2)	Inspection	Semi-Annually
			Make sure gate
Barometric Damper	Inspect	Every 3	swings freely,
		Months	no spillage
			into room
Flue	Cleaning	As Required	Wire Brush
		Every 3	Joints should
Vent System	Inspect	Months	be sealed

(1)If furnished with oiling provisions.

(2)If flange gasket is damaged, it must be replaced.

ELECTRICAL SERVICING

CAUTION

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION.

VERIFY PROPER OPERATION AFTER SERVICING.

GENERAL FLUSHING

KEEPAPPLIANCEAREACLEARANDFREEFROMCOMBUSTIBLE MATERIALS,GASOLINEANDOTHERFLAMMABLEVAPORSAND LIQUIDS. (SEE WARNING PAGE 6).

Water heater maintenance includes periodic tank flushing and cleaning, and removal of lime scale. The power burner should be inspected and adjusted to maintain proper combustion. Refer

1.Turn off the heater electrical disconnect switch.

2.Open the drain valve and allow water to flow until it runs clean.

3.Close the drain valve when finished flushing.

4.Turn on the heater electrical disconnect switch.

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