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Forced Air Heating Fundamentals
Terms in this set (38)
Heat distribution for conditioned spaces in HVAC systems is primarily done through the following methods, exept__________.
In a forced-air systems, the component responsible for delivering heated air to the conditioned space is the_________>
Before forced air- systems were developed, heating systems relied on________ to move air to and from conditioned spaces.
A gravity heating systems had to be installed________ for the system to be effective.
In a lower part of a building
An electric heating system_______.
Has one or more resistance heating elements.
A furnace's heat exchanger is where heat is transferred from_______.
Combustion gases or electric elements to circulating indoor air.
A secondary heat exchanger differs from a primary heat exchanger in that it________.
Transfers BOTH sensible & latent heat.
Due to system operation, a furnaces secondary heat exchanger may be made of_______.
Due to system operation, a condensing furnaces exhaust piping is often made of______.
A condensing furnace has annual fuel utilization efficiency (AFUE) rating that is_____.
Condensing furnace combustion gases must be vented through a chimney?
An indoor blower with a direct drive motor will run at______.
The same speed as the motor
For belt driven indoor blowers, as the size of the pulley on the motor increases, the blower speed______.
For belt driven indoor blower, as the size of the pulley on the blower increases, the blower speed______.
Belt driven blowers are inherently more efficient than direct drive blowers?
A combustion blower moves fresh air and combustion air through the_____.
A furnace that is adjustable so that a technician can configure it as up flow, downflow, or horizontal is a _____ furnace?
A highboy furnace is ______.
Installed in areas where vertical space is not an issue
A lowboy furnace is ______.
Arranged inside to minimize the height of its cabinet.
An up flow furnace draws in air from its_____.
A downflow furnace draws in air from its_____.
A furnace is considered two stage because it can_____>
Produce two different levels of heat.
A furnace is considered modulating because it can_____.
Vary its heat output from 40% to 100% of its total capacity
A forced air system usually contains an air filter_____.
On the return air side of the system.
Air that has been heated flows through a forced air systems______ ducts.
Air that is about to be heated flows through a forced air systems______ ducts.
Negative pressure in a building can cause exfiltration around doors and windows.
Building codes may require the use of makeup air units for the purpose of preventing______ from developing in a house.
Makeup air is commonly deposited directly into the_____.
Return Air Duct
A combustion type furnaces burners and blower both turn OFF and ON at the same time?
A time delay control on a circuit board is often adjusted using a set of____.
A thermostatic control may delay turning on a blower until the plenum has rached_____.
A thermostatic control may delay turning off a blower until the plenum has reached______.
In a heating system, a limit control is a temperature sensing switch that______ as long as the plenum temperature remains below its set point.
When a plenum limit control actuates, the most likely and direct cause would be a ______.
Blower not blowing
Unit heaters commonly produce heat from the following, except______.
Unit heaters are most often used to warm_____.
Large, open areas
In summer, the heating section of a unit heater can be turned off and high flow air can be directed across doorways and building openings to function as an______.
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