Clocking the Meter (for Natural Gas only)
1. Turn off all other appliances and pilots.
2. Turn on the unit and set the unit to high fire.
3. Ensure the unit has a large load to heat, so that the unit 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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