Basic Measurements
How many inches are in a foot?
What is 12?
Standard voltage for residential HVAC systems in the U.S.
What is 120 or 240 volts?
Standard atmospheric pressure at sea level in PSI.
What is 14.7 PSI?
Standard airflow per ton of cooling.
What is 400 CFM?
The law stating that pressure and temperature are directly proportional in a closed system.
What is Gay-Lussac’s Law?
How many cubic feet are in 1 cubic yard?
What is 27?
Ohm’s Law formula.
What is V = I × R?
Boiling point of water at sea level in °F.
What is 212°F?
How many BTUs in one ton of cooling?
What is 12,000 BTU/hr?
Name of the chart used to find refrigerant pressure/temperature relationships.
What is a PT chart?
How many ounces are in a pound?
What is 16?
If a circuit has 12 amps and 240 volts, how many watts is it using?
What is 2,880 watts?
Typical R-410A suction pressure at 40°F evaporator temp (approximate).
What is ~118 PSI?
If you have a 3-ton system, how many CFM should it move?
What is 1,200 CFM?
the ideal gas law formula
What is PV=nRT
Convert 3 feet into inches.
What is 36 inches?
Standard frequency of electrical systems in the U.S.
What is 60 Hz?
Conversion factor from PSI to inches of mercury (Hg).
What is 2.036?
explain A B C when checking certain steps
What is Air flow Before Charge
R-134a boiling point at atmospheric pressure.
What is -15°F?
How many square inches are in a square foot?
What is 144?
A motor is rated at 5 HP. How many watts is this approximately?
What is 3,730 watts?
Pressure at which R-22 boils at 40°F evaporator temp (approximate).
What is ~68 PSI?
Formula for duct sizing using velocity method.
What is CFM = Area × Velocity?
R-410A boiling point
What is -55.3 degrees F