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Hvac questions

jJon G

Active member
Joined
Oct 2, 2011
Messages
32
Location
Newfoundland Canada
This might be a bit wordy but I want to make sure I cover all the info
I live in St johns Newfoundland Canada temperature range in the winter is -8c to 3c but can get down to -15 and more with the wind chill. The summer range is not that much better 8c to 14c so all in all our weather fluctuates a lot and this causes a wet climate. Our weather is Crappy ……..
So my house is around 8 years old it is a split entry 32’x32’ with an unfinished basement.
I have a venmar constructo 1.5 air exchanger. It WAS in the back left hand corner of the house with the exhaust exiting on the back of the house and the fresh air intake around the corner on the left hand side of the house with a storm cover over the intake (bigger hood)
The air exchanger was working when we bought the house. But the pipes were all torn up and not insulated. It was a messy install at best and the previous owner had it apart. The house was ALWAYS cold.
I decided to move the air exchanger to the front of the house (front left hand side) as it will be over the hot water tank and free up more room in the back. To do this I just extend the hoses from the intake and exhaust with new longer flex pipe running in between the floor joists. Regular 6’’ flex for the exhaust and insulated 6’’ flex in a plastic sleeve for the intake. My joins for the fresh air intake are sealed with no air getting in. 6’’ clamp on flex and then red tuck tape on plastic sleeve.
Moving forward I am in the process of starting to finish my basement and looked at the fresh air intake and the insulation is soaked with water! So I followed the pipe and you can feel the wet insulation 15’ from where the intake goes through the wall. I do not think this is due to snow or rain ingestion. I am thinking it is due to condensation on the fresh air intake.
My house is Allways cold and the snow around the exhaust is melted from the machine pumping out my heat …..
So what are your thought on this ? what can I do ?

Thanks
 
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derkperk

Well-known member
Joined
Feb 3, 2016
Messages
108
You are on the right track with the condensation. A shorter or better insulated flex would help.

As far as you house feeling cold I would guess that your air exchanger is causing a negative in your house, sucking the cold air in through every gap and crack. One thought is to reduce the amount of exhaust air from the ventilator allowing more of a positive pressure in your house.

Sent from my XT1565 using Tapatalk
 
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DC73

Well-known member
Joined
Dec 27, 2014
Messages
1,627
Location
Lubbock TX
There are some building science gurus who hang out on the Q&A forum at GreenBuildingAdvisor who should be able to give you some solid advice to go along with what derkperk has told you.

DC
 

justinjoyal

Well-known member
Joined
Apr 30, 2015
Messages
888
Location
Quebec
Entry-level HRV, poor installation techniques, i would guess no airflow balance... you get that kinda results.

Make sure the insulation is good, replace all accessible flex duct with rigid, have the system balanced.

Should help quite a lot.
 
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