Very informative presentation. My HVAC guy was looking over my 4 zone system that was installed in 2007 and recommended to add the smart bypass zone damper and this video was outstanding for me to understand how it works. 👍🏼
I am having major humidity issues in my home and the bypass i have is static not dynamic so always in one position. Could this be the cause of my problem?
There can be many reasons for this: Short Cycling: VVT systems can cause the air conditioner to short cycle, especially if the bypass damper is open too often. Short cycling means the air conditioner turns on and off frequently without running long enough to adequately remove moisture from the air. Bypass Damper Operation: When the bypass damper is open, it allows some of the conditioned air to bypass the living spaces and return directly to the HVAC system. This can reduce the system’s ability to cool the air in the living spaces, leading to insufficient runtime for dehumidification. Oversized HVAC System: An oversized air conditioning unit can exacerbate the problem. Oversized systems cool the air quickly but do not run long enough to dehumidify effectively. Improper Zoning and Airflow: In a VVT system, improper zoning or poor airflow management can lead to uneven temperature distribution and ineffective dehumidification. If certain zones reach the desired temperature too quickly and shut off airflow, other zones may remain humid because the system doesn’t run long enough to dehumidify those areas. Bypass Damper Settings: If the bypass damper settings are not correctly configured, it can lead to an excessive amount of air bypassing the living spaces. This reduces the efficiency of the system in removing moisture from the entire home. The settings need to be calibrated to ensure optimal airflow through the occupied zones. Lack of a Dedicated Dehumidification Mode: Some VVT systems do not have a dedicated dehumidification mode, which could result in inadequate moisture removal. Advanced HVAC systems with dehumidification modes can operate at lower cooling capacities for longer periods, enhancing moisture removal even if the temperature setpoint is quickly achieved. Good Luck.
Good analogy. At least there is an energy saving component on the secondary side with VFD's on the pumps, no such luck with the air-side bypass damper.
VVT systems are not widely specified anymore as modern HVAC system provide a more energy efficient solution including the VAV system and VRF/VRV Systems.
Very informative presentation. My HVAC guy was looking over my 4 zone system that was installed in 2007 and recommended to add the smart bypass zone damper and this video was outstanding for me to understand how it works. 👍🏼
Glad it was helpful! Thanks for watching.
I just finished this HVAC series and I'm grateful to find such an informative and accurate teaching lessons on UA-cam!!
Thank you
Very informative for a home inspector. Thank you.
Glad it was helpful!
Thank you so much! Easy to understand explanation
Glad it was helpful! Thanks for watching.
Great video. Thank you.
Glad you liked it!
What type of damper is used to control the CFM entering the room
You can use a Motorized Control Damper or a Barometric Type Damper
great explanation 👏
Thank you
Just worked on a VVT system and what a nightmare. 1 zone calling equals high head pressure (in heating).
I am having major humidity issues in my home and the bypass i have is static not dynamic so always in one position. Could this be the cause of my problem?
There can be many reasons for this: Short Cycling: VVT systems can cause the air conditioner to short cycle, especially if the bypass damper is open too often. Short cycling means the air conditioner turns on and off frequently without running long enough to adequately remove moisture from the air. Bypass Damper Operation: When the bypass damper is open, it allows some of the conditioned air to bypass the living spaces and return directly to the HVAC system. This can reduce the system’s ability to cool the air in the living spaces, leading to insufficient runtime for dehumidification. Oversized HVAC System: An oversized air conditioning unit can exacerbate the problem. Oversized systems cool the air quickly but do not run long enough to dehumidify effectively. Improper Zoning and Airflow: In a VVT system, improper zoning or poor airflow management can lead to uneven temperature distribution and ineffective dehumidification. If certain zones reach the desired temperature too quickly and shut off airflow, other zones may remain humid because the system doesn’t run long enough to dehumidify those areas. Bypass Damper Settings: If the bypass damper settings are not correctly configured, it can lead to an excessive amount of air bypassing the living spaces. This reduces the efficiency of the system in removing moisture from the entire home. The settings need to be calibrated to ensure optimal airflow through the occupied zones. Lack of a Dedicated Dehumidification Mode: Some VVT systems do not have a dedicated dehumidification mode, which could result in inadequate moisture removal. Advanced HVAC systems with dehumidification modes can operate at lower cooling capacities for longer periods, enhancing moisture removal even if the temperature setpoint is quickly achieved. Good Luck.
Very informative
Glad it was helpful! Thanks for watching.
Is it too far of a reach to compare this to a primary and secondary water loop? Where the primary loop is basically driven by constant speed pumps?
Good analogy. At least there is an energy saving component on the secondary side with VFD's on the pumps, no such luck with the air-side bypass damper.
So the only difference between vav and vvt are bypass and vfd? Or i dont get it 😅
VVT systems are not widely specified anymore as modern HVAC system provide a more energy efficient solution including the VAV system and VRF/VRV Systems.
good job
Thank you
What is VAV?
VAV is Variable Air Volume. See our Video on VAV's for a better explanation.ua-cam.com/video/jXV3i9_QOhQ/v-deo.html