Faced with Home Manager retirement, what should a homeowner do? Know your House Facts.  By design, “Variable Air Volume” is the foundation of your house mechanical systems sizing, ducts, sensors and electronic controllers which optimize comfort and operating efficiency.


Know your House Facts:  House “Characteristics" with Home Manager and VAV method. -



1) HVAC ducts are designed for multi-zone VAV operation.
2) HVAC ducts are over-sized by design to work optimally in a VAV system.
3) HVAC ducts are not equipped with "balancing" dampers since VAV is “self-balancing.”
4) By design VAV may have fewer air supply registers in room/area than conventional systems.
5) VAV method monitors temperature in each room/area (not average temperature in a hallway).
6) VAV method heats/cools specific areas per specific requirement. (cools gym, not her office).
7) VAV method adjusts according to active solar loads  (if South too hot or North too cool).
8) VAV delivers both personalized comfort and house-wide efficiency harmoniously.
9) VAV efficiency permits reducing 1 ton of capacity under Title 24, saving on initial costs.

Abandoning your designed VAV method will revert your house to a non-zoned configuration. Be aware this will affect your house comfort, efficiency and energy costs.

Know your House Facts: House “Characteristics" without Home Manager and VAV method. -

1) Cost of HVAC operations will increase at least 30%.
2) Longer average time required for areas to reach desired temperature comfort levels.
3) Some areas will not reach desired temperature under certain internal and solar loads.
4) Some areas will overshoot desired comfort temperature levels causing hot/cold spots.
5) First floor comfort temperature determined by a single sensor (or thermostat).
6) Second floor comfort temperature determined by single sensor (or thermostat).
7) Cooling one bedroom cools all bedrooms.  (Like controlling room lights from breaker box.)
8) Solar loads (East/South/West) create uneven temperatures (too hot/cold) in daylight hours.
9) Reduced tonnage capacity (per VAV design) insufficient for highest heat/cool demand.

HouseWide Utiliti

"My home, better served."

            Contact HouseWide by email at: support@HouseWide.net

Tags: HVAC, Home, VAV, automation

Views: 3374

Reply to This

Replies to This Discussion

It's hard enough to get homeowners to buy complete systems instead of just doing a condenser swap, much less buying an expensive VAV system. What is the difference between VAV and conventional zoning?

The Home Manager multi-zone controller operates the "Direct Air" VAV method, not a bypass method as in conventional residential zoning. The "Direct Air" VAV method introduced in 1985 is proven to be efficient and effective. However, the Home Manager electronic controller is reaching end of serviceable life leading some owners to abandon VAV and revert to conventional or non-zoned HVAC configurations. The article "Know Your House Facts" informs owners and contractors of the benefits of maintaining and draw backs of abandoning their homes existing VAV method. I believe bypass method is now banned for new or expanded residential zone control systems under California 2013 Title 24 regulation.

So VAV is just a zoned system that doesn't use a bypass damper? If the ducts were oversized at the time of initial installation a conventional zoned system wouldn't need a bypass damper either. I never understood the whole bypass damper thing, it defeats the whole point of saving energy with a zoned system. It's much better to set up a zoned system where the zones that aren't calling are opened a little bit to relieve excess static pressure. Better yet just go with separate systems for each floor...

Are you suggesting homeowners replace the control module but keep the rest of the system? Is there a current module compatible with the 30year old system? Is it proprietary or can it be controlled with a conventional zone controller?

RSS

Featured Forum Discussions

What's the Most Profitable HVAC Job for Your Company?

Started by Wayne Melancon in HVAC. Last reply by Wayne Melancon 8 hours ago. 3 Replies

Lighting replacement - 300 watt LED flood light

Started by Mary Sinkler in General Forum. Last reply by Jan E. Graveamker yesterday. 4 Replies

Glass Block Windows

Started by Ken Kalke in Best Practices. Last reply by Sean Lintow Sr on Saturday. 1 Reply

EZ Green Home is Hiring!

Started by Chloe Chapman in General Forum Jan 5. 0 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Michael Dunseith commented on Kirsten Richnavsky's group Retrotec, Inc
"Congratulations on your new postion. Looking forward to working with you in the near future. Best…"
3 hours ago
Michael Dunseith joined Kirsten Richnavsky's group
3 hours ago
Wayne Melancon replied to Wayne Melancon's discussion What's the Most Profitable HVAC Job for Your Company?
"I'll agree with you there Ken. We'll get shopped by residential when the customer already…"
8 hours ago
Horace Douglas Hunt, Jr. commented on Horace Douglas Hunt, Jr.'s photo
Thumbnail

IMG_3138

"and....this was the best looking spot in the air handler. Seal the unit if you want to have any…"
10 hours ago
Horace Douglas Hunt, Jr. commented on Horace Douglas Hunt, Jr.'s photo
Thumbnail

IMG_3139

"Beginnings of mold....due in some part to leaks in air handler pulling hot humid air from…"
10 hours ago
Horace Douglas Hunt, Jr. posted photos
10 hours ago
Eric Kjelshus replied to Wayne Melancon's discussion What's the Most Profitable HVAC Job for Your Company?
"What is your "Key Performance Indicator" dollar per hour? gross dollar per man day? % of…"
19 hours ago
Jan E. Graveamker replied to Mary Sinkler's discussion Lighting replacement - 300 watt LED flood light
"Hi Mary, What is the purpose of lighting the backyard ?  Sense of safety, night time…"
yesterday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service