Common HVAC Formulas : 1.Clocking a Gas Meter

 Process:

  • Use the timing method to measure gas consumption by clocking the gas meter.

  • Ensure only the target appliance is running (turn off other gas appliances).

  • Time one full revolution of the meter’s service dial using a stopwatch.

  • Note the time taken for a complete revolution.

Formulas for Gas Consumption:

  • For 1/2 cubic foot dial:

    • Formula: 1800 ÷ (time in seconds)

  • For 1 cubic foot dial:

    • Formula: 3600 ÷ (time in seconds)

BTU Conversion:

  • Multiply cubic feet of gas consumed per hour by the BTU value per cubic foot (approx. 1000 BTUs).

Example:

  • Time for 1 revolution = 24 seconds (for a 1/2 cubic foot dial).

  • Calculation: 1800 ÷ 24 = 75 cubic feet per hour.

  • BTU consumption: 75 cubic feet × 1000 BTUs = 75,000 BTUs/hour.


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