A.O. Smith HW 610 warranty Checking And Adjusting The Input

CHECKING AND ADJUSTING THE INPUT

1.Follow steps 1 thru 6 of the OPERATING INSTRUCTIONS.

2.Attach a pressure gauge or a manometer to the manifold pressure tapping and refer to table 10 for correct manifold pressure.

3.Follow steps 7 thru 11 of the OPERATING INSTRUCTIONS.

4.Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not ON during this interval.

3600 x H = Btuh

T

Btuh = The approximate actual input rate.

T = Time in seconds to burn one cubic foot of gas.

H = Heating value of the fuel gas in Btu per cubic foot of gas.

EXAMPLE:

T = 9.0 seconds/ft3

H= 1050 Btu/ft3(natural gas) Btuh = ?

Gas flow through meter:

3600 x 1050 = 420,000 Btuh

9.0

Small changes in the input rate may be made by adjusting the manifold pressure, see GAS PRESSURE REGULATORS. Under no circumstances should you exceed the maximum input rate for the boiler given in table 2 on page 6.

5.Repeat steps 1 thru 6 of the OPERATING INSTRUCTIONS.

6.Remove the pressure gauge or manometer from the manifold pressure tapping. Replace the screw-in plug in the manifold pressure tap.

7.Repeat steps 7 thru 11 of the OPERATING INSTRUCTIONS. The boiler will resume normal operation.

When the boiler is operating at full capacity, or full gas input, it should consume 1 cu. ft. of gas in approximately the time indicated in table 10.

TABLE 10.

CONSUMPTION RATE

(Refer to Operating at Full Input or Full Capacity)

	Heating	Time to Consume 1 cu. ft. of gas (seconds)
Type Gas	Value	HW-	HW-	HW-	HW-	HW-	HW-
	Btu/Ft.
		300	399	420	520	610	670
Natural	1050	12.6	9.5	9.0	7.3	6.2	5.7
Propane	2500	30.0	22.6	21.4	17.3	14.8	13.4

IMPORTANT

UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT EXCEED THE INPUT SHOWN ON THE BOILER MODEL AND RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE BOILER. Minor variances from input on rating plate can be corrected by adjustment of gas pressure regulators described in GAS PRESSURE REGULATORS section of this manual.

The inlet gas pressure must not exceed or be less than the values shown on rating plate.

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