American Water Heater BCG3 - Manual (Page 27)

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checking the input
for appliance installation locations with elevations above 2000
feet, refer to HiGH ALTiTuDe iNSTALLATioNS section of this
manual for input reduction procedure.
1. Attach a pressure gauge or a manometer to the manifold
pressure tap on the gas valve and refer to Table 10, for correct
manifold pressure.
2. use this formula to “clock” the meter. Be sure that other gas
consuming appliances are not operating during this interval.
(3600/T) x H = Btuh
T = Time in seconds to burn one cubic foot of gas.
H = Btu’s per cubic foot of gas.
Btuh = Actual heater input.
example: (using BCG3 100T250 6NoX heater)
T = 15.1 seconds
H = 1050 Btu
Btuh = ?
(3600/15.1) x 1050 = 250,000 (Compare with BCG3 100T250
6NoX model and rating.)
Should it be necessary to adjust the gas pressure to the
burners to obtain the full input rate, the steps below should
be followed:
3. Remove the regulator adjustment sealing cap and adjust the
pressure by turning the adjusting screw with a screwdriver. See
figure 25.
Clockwise to increase gas pressure and input rate.
Counterclockwise to decrease gas pressure and input rate.
4. “Clock” the meter as in step 2 above.
5. Repeat steps 3 and 4 until the specified input rate is achieved.
6. Turn the gas control knob to PiLoT. Remove the pressure
gauge and replace the sealing cap and the Allen wrench set
screw in the pressure tap opening.
uNDeR No CiRCumSTANCeS SHouLD THe GAS iNPuT eXCeeD
THE INPuT sHoWN oN THE HEaTER MoDEl aND RaTING
PLATe. oVeRfiRiNG CouLD ReSuLT iN DAmAGe oR SooTiNG
of THe HeATeR.