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IECC (2015, section C402.5.5) states that the outdoor air supply and exhaust opening be supplied with Class 1A motorized dampers with a maximum leakage rate of 4 cfm/ft2 at 1 in. Wg when tested in accordance with AMCA 500D. Greenheck’s volume control dampers meets the requirements of ASHRAE, California Title 24 and IECC. Suncourt Motorized Zone Dampers. Control airflow to individual rooms. The ZoneMaster Zone Control Dampers save money on heating and cooling by controlling temperatures in individual rooms. Normally open or normally closed configurations. 100% airflow shutoff.
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I work for a large university, and many of our dedicated fresh air dampers are motorized because they are controlled through the Building automation system off of a return CO2 sensor or CO2 sensor located in the space. If the CO2 level rises then the fresh air damper opens to bring in more fresh air and vice versa.
It saves energy by only bringing in the amount of fresh air required to satisfy what is needed by the occupants and not having to condition a specific amount of outside air constantly that you would with a manual damper. I believe me try to keep the CO2 level below 800ppm.
I work for a large university, and many of our dedicated fresh air dampers are motorized because they are controlled through the Building automation system off of a return CO2 sensor or CO2 sensor located in the space. If the CO2 level rises then the fresh air damper opens to bring in more fresh air and vice versa. It saves energy by only bringing in the amount of fresh air required to satisfy what is needed by the occupants and not having to condition a specific amount of outside air constantly that you would with a manual damper. I believe me try to keep the CO2 level below 800ppm.I see that a lot, and have had to program the same sequence, but have a fundamental issue with it. Essentially you are forcing the co2 level up to a point just short of making people sick. I know, gotta save energy.Sorry, rant mode off.Oh, and here they usually make me measure osa co2 and control 400 ppm above that rather than a fixed setpointSent from my ADR6300 using Tapatalk 2. I see that a lot, and have had to program the same sequence, but have a fundamental issue with it.
Essentially you are forcing the co2 level up to a point just short of making people sick. I know, gotta save energy.Sorry, rant mode off.Oh, and here they usually make me measure osa co2 and control 400 ppm above that rather than a fixed setpointSent from my ADR6300 using Tapatalk 2People will not get sick from CO2 levels above 1,000 ppm.CO2 is used as marker of people occupancy indicating the need for fresh to purge the indoor pollutants. The CO2 is not a dangerous pollutant.Regards TB.
It apears that I did not explain my question properly. Let me clear it up.With manual dampers, you can adjust the percentage of fresh air (outdoor Air) from zero and up., normaly 15% ( code Requires??) for unit over 5 tons is recomended to presurize the building.
Equipment brings the outdoor air regardless of low or high OA. There is no sensor.
You get warm air in the summer, cold air in winter as long as the blower fan runs. There is some aluminum filters to prevent insects and rain to get in the retun side.Now they changed the code and want motorized damper to open blades to let OA get into the retun air.
Also there is minimum setting from 15% and up. As soon as blower fan starts, actuator opens the blade to preset position.
The damper motor opens the blades as long as blower fan motor runs. And it spring closes the blade when there are no power to damper motor.
There is no sensor no thermostat, nothing, no control but blower fan motor low voltage. Now my question is that what is the purpose of this Motorized damper which is inspector asking for it? I just Like to know what's the logic behind it. The manual damper wouldn't do the same? It apears that I did not explain my question properly.
Let me clear it up.With manual dampers, you can adjust the percentage of fresh air (outdoor Air) from zero and up., normaly 15% ( code Requires??) for unit over 5 tons is recomended to presurize the building. Equipment brings the outdoor air regardless of low or high OA. There is no sensor.
You get warm air in the summer, cold air in winter as long as the blower fan runs. There is some aluminum filters to prevent insects and rain to get in the retun side.Now they changed the code and want motorized damper to open blades to let OA get into the retun air. Also there is minimum setting from 15% and up. As soon as blower fan starts, actuator opens the blade to preset position. The damper motor opens the blades as long as blower fan motor runs. And it spring closes the blade when there are no power to damper motor. There is no sensor no thermostat, nothing, no control but blower fan motor low voltage.
Now my question is that what is the purpose of this Motorized damper which is inspector asking for it? I just Like to know what's the logic behind it. The manual damper wouldn't do the same?I think the other guy that replied about closing the damper in the 'off' cycle answered your question. Quick Navigation. Site Areas.
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Proper ventilation within your home or business is vital to the health and comfort of the occupants as well as to the efficiency and energy usage of your HVAC system. A well-functioning ventilation system will allow for the smooth flow of warm or cool air and will also effectively move and filter air through the ductwork to remove allergens such as pollen and dust.One way of improving airflow in the ductwork of the HVAC system is through the use of dampers. Dampers work as valves within the ductwork to either stop or redirect the flow of air. Think of them as doors or plates within the ductwork that can be closed to shut off airflow or angled open to direct airflow.Dampers can be mechanical, operated by hand with a crank or handle to rotate the plate open or closed; one example of this is dampers used in the flue of a chimney to open the structure for smoke to escape when a fire is burning. Dampers can also be motorized, such as dampers used as part of an HVAC system to maintain climate zones within a home, office, or commercial building. Motorized dampers may be wired to and controlled by a thermostat or may be part of an overall building control system. Benefits of a Motorized DamperAdding motorized dampers is an efficient way of creating heating and cooling zones within a building.
Often referred to as Volume Control Dampers, or VCD, these motorized dampers are controlled by a thermostat. You can program them to control the climate and temperature of different parts, or zones, of the home for specific times of the day. For example, living areas may be zoned for higher volumes of air during the daytime while bedrooms may be zoned to receive more air at night.Motorized dampers offer greater control of airflow and air volume than merely closing a vent in a wall or on the floor. Dampers function system-wide throughout the ductwork to direct the flow and volume of air. Closing the supply vents doesn’t stop the outflow of air in the system and may actually cause a buildup of air pressure within the ductwork, putting a strain on the HVAC system.Motorized dampers offer energy efficiency benefits for your home or business as well. With the use of VCDs to create climate zones that match occupant use of the building, energy usage will decrease when compared to heating or cooling all parts of a home or building 24 hours a day. With zones, you can also take into account the number of floors and the impact of heat rising to the higher floors as well as areas of the building that receive greater amounts of sunlight and are naturally warmer due to ambient heat.
We Have a Motorized Damper for Your NeedsAlan Manufacturing offers a wide range of motorized dampers to keep your building comfortable and your HVAC system energy-efficient. For more information about how motorized dampers can improve the ventilation and climate control of your home or business, or view our motorized damper systems products below!