Multiple Zone Equipment 110304a Flashcards

1
Q

What are the two main reasons why residential and commercial structures are designed using multi-zone systems

A

Comfort and efficiency

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2
Q

How are the multi-zone systems providing more comfort and Efficiency

A

Can be divided into different zones with each having its own separate controls

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3
Q

What are motorized dampers controlled by?

A

Central control panel

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4
Q

What does each zone have to control
It?

A

A thermostat

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5
Q

Why is the multi-zone system saving energy ?

A

Not all zones requires energy at the same time, therefore certain zones dampers can be closed while some are open reducing the energy needed. Allowing for a shorter run time.

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6
Q

Digitally controlled zone dampers used in conjunction with an ECM motor or brushless (DC) in a variable speed become what ?

A

Smart systems. Constantly registering static pressure and automatically change the speed to maintain static pressure.

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7
Q

What does ECM stand for ?

A

Electronically commutated

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8
Q

What can closing off too many outlets could cause?

A

Temperature rise and high limit switch to open

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9
Q

What should be used to prevent a temperature rise and damage to equipment if too many outlets are closed at once ?

A

Bypass dampers

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10
Q

What are the two types of dampers

A

Barometric Damper
Motorized Damper

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11
Q

Is it necessary to install a bypass relief damper in smaller zones of larges multi-zone systems?

A

Yes it is necessary !

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12
Q

Name the two types of dual duct terminal units?

A

Dual duct mixing
Dual duct non-mixing

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13
Q

What is the main difference for a dual duct mixing compared to the non-mixing?

A

Set of perforated baffles that mixes the two air stream and passes through a single duct at a pre-set temperature.

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14
Q

What is the main difference of a Dual Duct non mixing compared to the dual duct mixing ?

A

One duct supply warm air and the other duct supply cool air.

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15
Q

List the two different types of fan powered terminal units

A

Constant volume
Variable volume

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16
Q

Describe a Three Deck multi-zone unit

A

Three deck has a neutral air stream, hot and cold air never mixes. The mix of the flow happens at the AHU. This system saves energy,

17
Q

Does a multi zone AHU deliver high or low velocity

A

Low velocity