Multiple Zone Equipment 110304a Flashcards
What are the two main reasons why residential and commercial structures are designed using multi-zone systems
Comfort and efficiency
How are the multi-zone systems providing more comfort and Efficiency
Can be divided into different zones with each having its own separate controls
What are motorized dampers controlled by?
Central control panel
What does each zone have to control
It?
A thermostat
Why is the multi-zone system saving energy ?
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.
Digitally controlled zone dampers used in conjunction with an ECM motor or brushless (DC) in a variable speed become what ?
Smart systems. Constantly registering static pressure and automatically change the speed to maintain static pressure.
What does ECM stand for ?
Electronically commutated
What can closing off too many outlets could cause?
Temperature rise and high limit switch to open
What should be used to prevent a temperature rise and damage to equipment if too many outlets are closed at once ?
Bypass dampers
What are the two types of dampers
Barometric Damper
Motorized Damper
Is it necessary to install a bypass relief damper in smaller zones of larges multi-zone systems?
Yes it is necessary !
Name the two types of dual duct terminal units?
Dual duct mixing
Dual duct non-mixing
What is the main difference for a dual duct mixing compared to the non-mixing?
Set of perforated baffles that mixes the two air stream and passes through a single duct at a pre-set temperature.
What is the main difference of a Dual Duct non mixing compared to the dual duct mixing ?
One duct supply warm air and the other duct supply cool air.
List the two different types of fan powered terminal units
Constant volume
Variable volume
