HVAC Gas Heat certification
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Gas piping must be installed with a pitch of - ANS ✓1/4" per 15' run
Pipe joint compound should be applied to - ANS ✓Male threads completely
A technician is installing a copper elbow on LP gas line; what should be
used - ANS ✓95/5 solder
To burn one cubic foot of Natural Gas completely, at least _____ of combustion
air must be available - ANS ✓15 cu ft.
The ignition temperature of Natural Gas is - ANS ✓1100°F - 1200°F
Air that is mixes with Natural Gas in the burner is called - ANS ✓Primary air
What is the volume of flue gas produced from a 60,000 BTU/h Category I fan
assisted Natural Gas furnace operating with 50% excess air? - ANS ✓600 cu
ft.
HVAC Gas Heat certification
, 2
HVAC
The purpose of a flue baffle is to - ANS ✓Increase heat exchange
The LP gas pressure supplied to the appliance gas valve should be - ANS
✓11 - 13 in. W.C.
An installed gas furnace should have a minimum of - ANS ✓12
Which conditions listed below would cause the temperature limit safety
switch to shut off the burner - ANS ✓Fan motor failure
The cut off plate is a component of the - ANS ✓Blower housing
A "spud" or burner orifice - ANS ✓Meters gas to the burner
A good thermocouple should read approximately ____ on a D.C. meter - ANS
✓30 millivolta
Liquefied petroleum, (LP) gases are - ANS ✓Propane and butane
Fan time/temperature delay switches are used on gas furnaces to - ANS
✓Allow the heat exchanger to warm up
HVAC Gas Heat certification
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