[D2L] 102E Air Handling Systems & Accessories Flashcards
Air handling systems can be either all air to air, or air to water systems.
T or F
True
Where are the terminal units, called coils, located when a hydronic system is used?
In the duct work above the zone it’s used in
Where is the evaporator located in a central air conditioner?
1) In the return air before the furnace
2) in the supply air above the furnace
3) typically on the side of the house
4) it usually goes on the roof of the dwelling it supplies
2) in the supply air above the furnace
What are two types of makeup air units? (MULTI-SELECT
1) delay interlocked
2) variable air
3) indirect fired
4) direct fired
indirect fired
direct fired
What is the difference between a direct fired and an indirect fired make up air unit?
1) The direct fired unit has a heat exchanger
2) the indirect fired unit has a heat exchanger
3) the products of combustion enter the space in an indirect fired
4) An exhaust fan must be interlocked with a indirect fired unit
the indirect fired unit has a heat exchanger
What are the 3 most commonly used centrifugal fans
1) Backward curve
2) Forward Curve
3) Radial
4) Axial
1) Backward curve
2) Forward Curve
3) Radial
Which bearing does not need lubrication?
1) sleeve bearing
2) ball bearing
sleeve bearing
What is the L on the end of a belt type mean?
Light duty
Make sure belts are always fully lubricate to extend the belts life
False, belts don’t need to be lubricated
The narrower the space between the two halves of an adjustable sheave, the faster the fan will spin (assume the blower has a fixed sheave)
T or F
True
What is the minimum fresh air that must enter a building?
10%-20%
What is the purpose of a Make up air unit?
to replace exhausted air
Why do you not oil sleeve bearings?
the sleeve bearing loses its lubricating lead
Why is the slinger fan used in a window shaker?
Efficient removal of condensate
Which fan style is the most efficient for high volume flow rates and high static pressure?
Airfoil
