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HVAC – NHIE EXAM STUDY GUIDE
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HVAC – NHIE EXAM STUDY GUIDE
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HVAC – NHIE EXAM STUDY GUIDEair handler - Answers-the inside unit of a heat pump
also sometimes used to describe a fuel-fired forced air furnace.
What are the parts of the air handler? - Answers-fan, evaporator coil, associated control
and operating parts
boot - Answers-sheet metal formed into a rectangle or circle that connects an air duct to
a grille or register. Also called the HVAC distribution system.
BTU (british thermal unit) - Answers-amount of heat required to increase the
temperature of 1 pound of water by 1 degree fahrenheit.
collar (duct) - Answers-a round sheet metal ring that connects a duct to a plenum or to a
trunk duct.
condenser unit - Answers-the outside unit of a split air conditioning or heat pump system
consisting of a compressor, condenser coils, a fan, and an associated control and
operating parts
Damper (HVAC duct) - Answers-a plate or louvers installed in a duct system that permits
control of how much air flows in a duct.
Duct (branch) - Answers-a duct that runs between a trunk duct or a plenum and one
supply or return boot.
duct (stack) - Answers-a sheet metal duct that runs in a wall cavity; terminates in a stack
heat instead of a boot
duct (trunk) - Answers-a large duct that serves multiple branch ducts
liquid line (tube) - Answers-part of the refrigerant line set. the smaller, usually
uninsulated copper tube.
package system (A/C) - Answers-an a/c system or heat pump in which an evaporator
coil and fan are contained in one cabinet; usually located outside on the ground or on
the roof, but may be inside.
plenum - Answers-enclosed space through which air flows in an a/c system; supplies air
to or receives air from branch ducts;
compressor - Answers-part of an a/c or heat pump condenser unit; compresses the gas
refrigerant into superheated gas, and provides energy to move the refrigerant through
the system
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