Gas Piping & Safety
A description of nominal size would be:
An approximation of inside diameter
Too much primary air causes the flame to
Lift off the burners
Duct joints must always
Be airtight
Name the three ways to transfer heat
Conduction, Convection, Radiation
What is the definition for BTU (other than British Thermal Unit)?
The amount of heat required to raise the temperature of 1 pound of water by 1°F
Leaks in gas piping should be located with
Soapy bubbles
The simplest and most common burner used today is the
Inshot burner
ow many inches must be added to your measurement to account for the Pittsburgh?
1 inch
Regarding insulation, a high R-Value (R-50) is less efficient than a low R-Value (R-19) (True or False)
False
What is the purpose of primary air?
It mixes with the main burner fuel before the point of ignition
The gas supply line to a mobile home is commonly
¾"
What is the correct natural gas pressure leaving the gas valves?
3.5" WC
What is the purpose of the tabs on drive cleats?
Prevent movement of the drive cleat
Convert 25 Degrees Celsius to Fahrenheit
77°F
What is the purpose of the pressure regulator that is located on a combination gas valve?
It takes an incoming gas pressure of 7" WC and reduces it to 3.5" WC
To locate gas leaks what should you not use?
Never use an open flame
What is the heating value of natural gas?
1,000 Btu/cu ft
Which tool is commonly used to decrease the diameter of the male fitting on a round duct?
Crimping tool
What is Latent Heat?
A change of state
The G terminal is used for what?
Blower
Pipe thread compound is used for the purpose of:
Acting as a lubricant and providing a seal
DOUBLE JEOPARDY!!
Which of the following is not considered a position of air flow used on today's furnaces?
Vertical
What is the tool we used in lab that attaches to a drill to cut round take-off holes?
Hole Shooter
Give the specific heats of ice, water, and steam.
Ice: 0.5, Water: 1, Steam: 0.5
The terminals R and C on the transformer are the what?
Low Voltage terminals