Accounting /Unit 38 HVAC Basics: Ductwork, Fasteners, and System Operation

Unit 38 HVAC Basics: Ductwork, Fasteners, and System Operation

Accounting32 CardsCreated 2 months ago

This deck covers essential questions and answers related to HVAC systems, focusing on ductwork, fasteners, and system operation. It is designed to help students understand key concepts and practices in HVAC installation and maintenance.

One drawback of using custom made duct

All of the above
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Key Terms

Term
Definition
One drawback of using custom made duct
All of the above
What fasteners are used with sheet metal
S fasteners & drive clips
What fasteners are commonly used with round flex duct
Self tapping screws
A good way to fasten acoustical lining to the inside of sheet metal duct is to use
Tabs & adhesives
What two fasteners are used with fiberglass ductboard
Staples & tape
____ used at the end of a metal duct run will help reduce any noise
Flexible duct

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TermDefinition
One drawback of using custom made duct
All of the above
What fasteners are used with sheet metal
S fasteners & drive clips
What fasteners are commonly used with round flex duct
Self tapping screws
A good way to fasten acoustical lining to the inside of sheet metal duct is to use
Tabs & adhesives
What two fasteners are used with fiberglass ductboard
Staples & tape
____ used at the end of a metal duct run will help reduce any noise
Flexible duct
A boot in a duct system is a fitting used
Between the branch duct & the supply register
A trap in the condensate line prevents
Air from being drawn up into the unit from the end of the drain
An auxiliary drain pan under the ...
Above the conditioned space
After refrigerant lines have been installed, they should be evacuated to a ___ vacuum
Deep
One purpose of a flex is to reduce the transmission
True
Application of acoustical lining to the interior...
True
Power to the control transformer...
False
When hanging a horizontal air handler, it should be pitched toward the drain port ...
False
The Sun shining on the panels& coils of the condenser...
True
When installing a split air conditioning system with the remote condensing unit
True
When removing the rubber plugs from a line set the hiss indicates
True
When the length of Quick Connect pre-charged line set is altered
False
Once the power has been connected to the condenser unit of a package air conditioner
False
A fitting used to change the size of a square or rectangular duct is called
Transition
A round to rectangular fitting is called a
A square to round transition
A split central air conditioning system is installed with the control
Air handler
The typical gauge wire that is used in low voltage control circuits is
18
Before a system is evacuated all piping should be filled with nitrogen
Leak checked
What materials are normally used in air conditioning duct system
All metal square or rectangular duct, all metal round duct, fiberglass duct board, and flexible duct
If a duct system has large leaks at the connections, what can be used to seal them up?
Mastic
Even though the cooling wire runs from the thermostat to the air handler, it actually just continues on to the condensing unit. Why isn't the cooling wire
If this was done a third set of wires would be need to run. Be by using the air handler as a junction box only two sets of wires need to be run
The line voltage for a system is normally installed by whom
A licensed electrician technician
Explain service accessibility
A tech should be able to see and touch the work at the same time
How much does sunshine affect the operation of a condensing unit
It lowers its efficiency, but the difference is not crucial
What does a technician do before altering a pre-charged line set?
Recover the refrigerant from the line set
Why is it necessary that the crankcase heater heats the compressor crankcase before starting the compressor?
To boil out any liquid refrigerant present in the crankcase. Otherwise, some of the liquid will react to the compressor cylinders and may cause damage