IBC SL 40-399 G3 Quick Start Manual page 6

Clocking the Meter (Natural Gas)
1. Turn off all other appliances and pilots.
2. Turn on the boiler and set the boiler to high fire.
3. Ensure the boiler has a large load to heat, so that the boiler will not shut off.
4. With a Stop-Watch, record the number of seconds for the smallest dial to make 1 full revolution.
5. CFH = (3600 x Dial Size) / Seconds.
6. CFH x 1000 (check local Btu content) = Input Btu's.
Note
For 2 PSI meters multiply CFH x 1.097
For Metric meters multiply CFH x 35.3
For 2 PSI metric meters multiply CFH x 1.097 x 35.3
For Altitude above 4,500' deduct 2% per 1,000' of altitude from the Input Btu's.
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