- #Anemostat variable volume reset control full#
- #Anemostat variable volume reset control registration#
- #Anemostat variable volume reset control free#
Acombination of the 2 will give you your min air flow requirement. Think of it this way both ducts are independent of each other. If your question does the Heating box go below its min if you are calling for cooling i would say No it doesnt not on the older style its not smart enough to do that. Hopefully this made some sense if not let me drink a few beers then i will try again lol. Usually they will supply a chart on the side of the box to use in conjunction with your pressure reading across your high and low pick up tubes. In this case the box manufactures make it really easy for you they know the opening because they made the box. Once you know the velocity going through a known size opening you can figure out your CFM. The formula for velocity pressure is total pressure - static pressure = velocity pressure. High side measures total pressure your low side measures static pressure. On a call for cooling your heating duct stays at 50 cfm and your cooling duct opens up to to meet your space load requirements not to exceed your cooling duct max air flow setting.Įach duct depending on how old it is should have what is called a velocity controller, there are a few different names for this controller. Acombination of the 2 will give you your min air flow requirement.Įxample Your min air flow requirement is 100 CFM, when the room temperature is satisfied both ducts or dampers will go to there min 50 CFM each. But, if there is nothing electronic or digital about these boxes, then the cold deck doesn't know what the hot deck is doing and vice versa.Ĭan anyone clear me up with this? I need to write the sequence of operation for the spec and this is blowing my mind.Ĭan anyone clear me up with this? I need to write the sequence of operation for the spec and this is blowing my mind.Think of it this way both ducts are independent of each other. So, effectively, once both decks are somewhat open, they should be allowed to drop below their individual min. The box should be allowed to reach min discharge airflow, while getting a portion of warm and cool air blended along an infinite variable ratio). My confusion is when the hot and cold decks are at min position. If room temp falls further, then the cold deck goes closed and the hot deck opens to its max position (approx 60% of max cooling airflow). Once the box reaches min airflow (approx 25% of max) if the room temp falls further, the hot deck opens(also has a min position equal to the cold deck min position). Go from max heat load (max cooling airflow) and airflow drops off as load drops via the cold damper.
I do not understand how these can function. We are adding 4 new boxes to be dual duct and we want VAV and to match the pneumatic controls so everything is the same style and type for future mantenance concerns.
The boxes are dual duct VAV around the perimeter and single duct VAV (cold deck for interior spaces). It has a hot deck and cold deck air system driven by 3 150HP vane axial fans and 2 60 HP vane axials all with variable pitch in the penthouse. I just did a one floor reno on a 72' building.
#Anemostat variable volume reset control registration#
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#Anemostat variable volume reset control free#
#Anemostat variable volume reset control full#
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