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HVAC Unit 38 Installation Review Questions
Terms in this set (22)
The three crafts normally associated with an air-conditioned installations are _____, _____, and _____.
duct, electrical, and mechanical. pg 985
T or F: The flexible duct system is the most economical.
Name two fasteners that typically fasten square or rectangular connections.
S fasteners and drive clips. pg 985
What fastener is normally used to fasten round duct connections?
Self tapping screws. pg 986
T or F: Insulation on duct does not prevent duct from sweating.
When insulation on the inside of the duct comes loose it causes: ABCD
D) reduced airflow. pg 986
Most duct insulation is made of _____.
fiberglass. pg 987
What is the purpose of the flexible duct connector?
To connect the main trunk to the boot at the room diffuser. It also reduces noise pg 988
What happens if flexible duct is turned too sharply around a corner?
It will greatly reduce the airflow. It may also collapse. pg 988
Why must flexible duct be stretched slightly for straight runs?
To keep the liner from closing and creating friction loss. pg 988
Explain how flexible duct is supported when installed.
It can be supported by a band of 1 inch or more in width to keep the duct from collapsing on itself or using built-in eyelets holes to hang it. pg 988
The two duct connection combinations for a package unit are _____ and ______.
Duct connections side by side and duct connections over and under. pg 992
What are the differences in a package system and a split system?
Package systems have all components in one cabinet or housing. Split systems have the evaporator normally located close to the fan section regardless of whether the fan is in a furnace or in a special air handler. pg 990 and 995.
T or F: A package unit comes from the factory with the charge inside.
True. pg 994
Name three criteria of a good location for an air-cooled condensing unit.
1. Proper air circulation
2. Convenience for piping and electrical service
3. Future service
4. Natural water and roof drainage
5. Solar influence
6. Appearance pg 997 - 998
What are benefits of using flexible duct?
How far apart must flexible duct be supported?
every 4 feet.
In California, what is the maximum distance a power disconnect can be located from an outside condensing unit?
What is the maximum voltage a 18 gage wire can handle?
Why does round duct use more space than square?
In order to get the same amount of air volume, a round duct will have to be wider since it loses volume at the corners of the space.
Why does sheet metal duct have creases stamped into them?
To prevent noise. The crease keeps the sheet metal from bouncing inside to outside when there is air pressure inside the duct.
How is insulation attached to square duct on the inside?
By spikes and washers, tabs and glue.
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