HRV UNIT

Paul S_3

I will be installing a Fantech FLEX 100H (HRV) Heat recovery ventilator. I've never installed a HRV , any kind. I have a few weeks to prepare and research they unit. I will have my top duct man with me, and I will handle all the electrical and start up. Im about to read the installation manual now. But I would like to hear in your own words, what is a HRV ? What does it do? How does it benefit the customer? Thanks Paul s

Paul S_3

HRV UNIT

Here are some pics make & how it's going to bee installed with air handler Paul S

Bob Bona_4

I use the Fantech

1504s a lot. I haven't had luck with ducting the fresh air to ducting in the supply...blow back into the hrv occurs. Instead, I tap it into the return at least 30" past the stale air intake back to the hrv. I use the dehum terminals to activate and use Honeywell Prestige stats to turn it on on a schedule based on the ASHRAE parameters loaded into the Prestige.



I would like to see better fan speed control. They can be a little noisy with hard ducting.



The simple explanation is that air passes over a hxer inside both incoming outside and exiting and the mix tempers the fresh air to building. You don't really want them on too much in humid times.

Paul S_3

thank You Bob

Anymore explanations please. Thanks Bob you explained it great, and the wiring. I just have to turn the air handler fan on with a set of dry contacts on the Hrv? And how importsnt is it to bslance the airflow betwen the 2 systems and can I use a dual port digital manometer to check the airflow via instalation manual. Thanks Paul S

Rich_49

Benefits

These units will provide fresh outside air to the occupants while transferring energy from previously conditioned air to the incoming . As newer stock gets tighter this is certainly needed . If you are connecting to a ducted system and not using this as a DOAS make sure to have the filters changed out regularly and a MERV filter above 11 is a good choice . DOAS is best (dedicated outdoor air system).

  Check out Building Science Corporation , Healthy Heating and Energy Vanguard websites to learn all you need for this .  Check your climate zone also as HRVs after years of installation have been identified as less desirable than ERVs in I believe all but two climate zones in the lower 48 .  You should also check out the Resnet BPI group on LinkedIn .  This first link will probably be the most helpful .  Welcome to the debate , hope you have lots of Advil .

http://www.energyvanguard.com/blog-building-science-HERS-BPI/bid/71488/This-Little-Ventilation-Mistake-Can-Lead-to-Comfort-Problems

 https://www.linkedin.com/groupItem?view=&gid=1110797&type=member&item=5870610683925647363&qid=73ad412a-00a9-4b91-9dd7-8396f5e9ff18&trk=groups_items_see_more-0-b-ttl

https://www.youtube.com/watch?v=gFRu0eWDOEg&hd=1

http://www.energyvanguard.com/blog-building-science-HERS-BPI/bid/73544/Can-Occupants-Be-Trusted-to-Control-Their-Home-s-Ventilation-System