Multi Equipment Systems Flashcards
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When might we need to use more than 1 piece of HVAC equipment?
On a large job, or a complex job.
what controls multiple roof top units (RTU) in a multi-equipment system?
Individual thermostats.
What are some examples of residential multi-equipment systems?
Furnaces Fan Coils Heat Pumps Boilers/Radiant Heat c/w HRV Geothermal heat pumps
What is used to provide heat in a multi-equipment fan coil system?
Boiler or tankless hotwater
What is an advantage to using a heat pump multi-equipment system in residential HVAC?
Provides heat in the winter and cooling in the summer.
What is a major disadvantage to using a radiant heat type system in a home supplying ventilation by using an HRV?
Cannot add cooling to the system.
When using a boiler to provide primary heating to a home, what is a good way to also provide cooling in the summer and humidity in the winter?
Adding a furnace or two for the remainder of the house.
What are three items that can be heated using a geothermal system?
Domestic hot water
In floor heating
HVAC
What is the main advantage to having a multi-zone system in a residential home?
Individually controlled zones, better comfort.
What are two disadvantages to not having a proper ventilation system in a new home?
Uncomfortable
High utility bills.
What controls the amount of conditioned air that will be delivered into a specific zone?
Motorized zoning dampers.
When installing two furnaces into a two story house, how is the house separated into two zones?
Typically the basement and main floor has one furnace, 2rds floor has its own furnace.
How can we avoid too much air going to one zone if the zoning dampers are closed from other zones in a residential HVAC system with a standard one speed blower?
Bypass damper.
What three advantages are there in having a variable speed multi-zone HVAC system?
Efficiency
Comfort
Control
Where is the bypass relief damper typically installed?
Between supply air plenum and return air drop.
List three things that can be emphasized in a superior mechanical system?
Extra ventilation
Filtration
Energy efficiency
What are two main factors additional and optional equipment may be required in a residential HVAC system?
Health
Comfort
Does the difficulty in designing a superior HVAC system affect the difficulty of installing it? (Yes or No)
Yes
When installing the trunk lines in a HVAC system, who should be communicated with to verify that there will be no conflict with the lighting or final aesthetics due to bulk heads used to conceal the duct?
Owner and general contractor.
Name 4 pieces of PRIMARY equipment?
Gas furnace
Geothermal heat pumps
Kitchen range fan
Condensing boiler
Name 4 pieces of SECONDARY equipment?
Electronic air cleaner
Steam humidifier
Motorized zone dampers
Evaporator coil
What are 3 components you will likely find in a radiant heating multi-zone residential system?
Boilers
Pumps
Piping manifolds
When ventilation and cooling options need attention what is the equipment of choice used in a radiant heating/boiler system?
Water source fan coils.
In which scenario would a high velocity fan coil unit be the system of choice?
When homeowners don’t want bulkheads.
What are two disadvantages of a high-velocity fan coil system?
Grill placement becomes critical
More noise
What type of ductwork and blower are used in a standard fan-coil HVAC system?
Standard blower, standard duckwork.
What are two factors that would make installing an HRV in a home a good idea?
Air Quality
Energy cost
What defines a fully dedicated HRV system?
One that is not coupled with any other HVAC equipment and stands alone with its own ductwork.
Which type of multi-equipment installations commonly use a fully dedicated HRV system?
Radiant heating system.
How is fresh air distributed in a partially dedicated HRV system?
Uses the ductwork of the primary air mover.
Which code requires a proper amount of ventilation within a building?
National Building Code
In which climates do we typically find packaged conventional heat pumps?
Climates that rarely drop below -10%C.
What are six types of exhaust fans typically found in commercial and residential buildings?
Kitchen range fans Ceiling mounted fans Inline centrifugal fans Up blast fans Cabinet fans Utlility fans
Where are kitchen range fans installed?
Over a kitchen range.
Where do you typically find ceiling mounted exhaust fans?
Washrooms and storage rooms.
In a residential application where would we use a inline centrifugal fan?
Primary ventilation.
Give on example of where we would use an up blast fan?
Manufacturing.
Where would you sometimes find a utility fan installed?
Restaurants.
What type of pressure will a utility fan overcome?
Static pressure.
What controls a motorized control damper?
Digital logic control center.
What is constantly measured in a digitally controlled zone system that communicates with the dampers in order to open and close them depending on demand for different zones?
Static pressure.
What are three types of humidifiers used in a multi-equipment HVAC system?
Steam humidifier
Flow through
Barrel type (drum)
What 9 components you may find on a integrated make-up air system?
Inline centrifugal fans Motorized fresh air dampers Inline electric duct heaters Duct thermostats Pressure and flow switches Interlock relays Time delay relays Intake hoods and ducting Glycol coils
What type of air may need to be replaced by integrated make-up air in a residential application?
Air exhausted by a range hood.
What opens a motorized fresh air damper?
Electrical current.
How are inline electric duct heaters rated?
Kilowatts
What monitors the air temperature within a duct and sends a signal to an electric duct heater to turn on?
Duct thermometers.
What can be used to regulate when a signal is sent to the integrated make-up air and tell it to energize?
Pressure switch.
Where are pressure switches typically installed on a duct system?
Externally on exhaust ducting.
What type of air pressure will initiate a current to the integrated make-up air to energize?
A increase in static pressure.
What type of switch is mounted within the duct and activated if there is airflow within the duct?
Flow or sail switch.
What device links the exhaust system to the make-up air system?
Interlock relay.
What device ensures the motorized damper is open prior to the make-up air system engaging?
Time delay relay.
When referring to integrated make-up air systems, what can cause low air volumes in the air delivery system?
Restrictive air flow.
In a large residential home, why would we need to install a integrated or field assembled make-up air system?
To make up air exhausted by the range hood.
What is an advantage for using a cased evaporator coil?
Matches the furnace opening.
What type of evaporator coils are typically installed in a plenum on a renovation or replacement project?
Uncased coil.
How is a bypass filter connected to the HVAC system?
Inlet on the supply air plenum/ outlet on the return air drop.
What is the air channeled through on a turbulent flow precipitator?
Series of perforated plates.
What are 3 reasons why roof mounted HVAC equipment is widely used for commercial structures in multi-equipment systems?
Provided fresh air requirements
Service without disturbing occupants
Doesn’t take space from the interior
Which building type uses a multi-equipment configuration, requires a higher-than-average amount of cooling due to high internal heat and infiltration?
Convenience stores.
What are 2 advantages of multi-equipment systems?
Comfort and efficiency.
What one word describes why multi-equipment systems are more efficient?
Zoning.
Zoning helps to eliminate cold and hot areas and gives the _______ to the individual living or working in that particular area.
comfort control
In a residential forced air system, using zone dampers, where should a bypass relief damper be installed?
In between supply and return-air plenums.
In multi-equipment configurations, every furnace and fan coil requires it’s own _________
return air trunk-line.
A dedicated HRV system is used to provide _______ in areas or zones that otherwise have none.
ventilation
Which four items below make up the connections for an HRV unit?
- Defrost air outlet
- Exhaust air outlet
- Fresh air inlet
- Recovered supply air outlet
- Stale exhaust air inlet
- Ventilation air inlet
Exhaust air outlet
Fresh air inlet
Recovered supply air outlet
Stale exhaust air inlet
