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Fresh air is a code requirement. I have a Vanee HRV2400 going in on the main systema and a Vanee 150E75NS going in on the second. They aren't really suitable for make up air on large kitchen...

That's not a code requirement here. Make up air is only required when there are unvented combustion appliance like gas furnaces, water heaters, fireplaces or when cooking exhaust fans exceed 600cfm....

What are those specific requirements?

Those vents have a much bigger open area and don’t force the air around two 90 deg bends.

ACCA manual T, next bedtime reading

Yeah, I like the look but then killed the idea when I looked at the vents. They are a bit deceptive even with the open area specs as the air hits a wall then has to bend around two other walls before...

OK, Thanks. That kinda lines up with a discussion with the HVAC engineer about using the supplies to balance the temperature. It's good information for a site meeting with my HVAC contractor to run...

If you can't or won't add anything constructive, please don't distract the discussion. Thank you.

So I asked the engineer to add a third supply to the far bedroom. That should help with balancing then.



Would that not decrease the airflow from the far returns and have the system behave as...

Didn’t say I was hvac engineer disputing it. Just an engineering background that makes me think it may not be optimal, just like your experience would lead you to have an opinion. That’s why I’m...

Just one HVAC engineer and one HVAC contractor. I’m stuck in the middle trying to figure whose opinion is going to make my system work better.

Not a dispute...yet. Just a constructive discussion :grin2:

The contractor modified the second floor system as well. I think for the better. I spoke with the Engineer about a return in the skylight shaft but he said it wasn't required and put a supply there....

That's a good idea, thanks. I think mechanical dampers can be put in the ducts and accessed in the mechanical room. I speak with the job foreman about it before the basement runs get put in.

No, the engineer designed them and the HVAC contractor enlarged two and added an additional return. I'm considering returning them to closer to the engineering design. And no, I'm not a guy with...

I'm currently building a new house and am at the rough in stage. The HVAC design was done by an HVAC Engineer and stamped by the building departments for my permits. The contactor added an extra...

Thank you for taking the time to test it and post your results. I have been considering one of those, but will likely pass now.

Unfortunately my site is currently a 1950s house that's going to get knocked down by an excavator and become a hole in the ground.

The basement is about 7 to 8 feet in the ground with 9 ft ceilings. The R20 in the basement must have a continuous insulation component. It can be met with ICF, R20 spray foam or R12 rigid or spray...

Therein lies my biggest issue. These systems are not the bulk of what most contractors install. When I ask for referrals or look for examples of past work, most of it is single or 2 stage Payne,...

The HVAC design is required for the building permit and is to certify that everything meets code, hence the use of code design parameters. The code is not that bad. There is no way to practically...

It's 2500 sq ft on the main floor with a full basement. Second floor has a separate system. I'm in Ontario and the heat loss was done by the HVAC engineer. They use minimum building code specs for...

I'm building new custom house and the HVAC design (done and signed by a certified HVAC engineer) has the first floor heat loss calculation specified an 88,000 BTU furnace and 4 ton AC. Our...

Climate is Zone 5A in Southern Ontario Canada. Normally there will 2 people in the house, and sometimes 4. I was planning to have the combination of variable AC, air handler and smart thermostat...

Gah, I'm rusty at posting images and can't figure out how to edit. Maybe a mod can remove the extra, please?

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Haven't posted here in some time. Looking for feedback on an HVAC design for my new build. Just received the design. The home has two separate systems. Priority is comfort/air quality,...

Wow, thread brought back to life. So what I ended up doing was the following:

1. Adding a damper to the fresh air intake
2. Enlarging the first floor return grille by about 50%
3. Adding a 6"...

9 ft ceilings. Wanted to use a termination kit, but pipes run perpendicular to floor joists, so had to go with two pipes

It only snows a couple times a year, accumulation is not much and just more to clean out accumulation of leaves, grass, etc and it won't be used below 40.



Personal preference to use the 98%...

About 2 feet more or less. I guess it's easier access to panel. Either way, no one looks at that side of the house, so it's neither here nor there. We talked about the pump ups and decided against...

Finally got some pics of the outdoor unit. I think the York Affinity's are one of the better looking units (if there is such a thing)

Hope the little Lattitude unit last 2 more years :(

I think it was a bonnet sensor they put in. It went in under the A in the coil.

Should the LTCO and BP be set at the same temp? This morning is was below the BP outside 36 deg. but the HP ran. ...

Thanks, but I thought you were God :D

I think they have hot HP enabled. I'm not sure I understand what you meant.

Since I bought the Y9C furnace at 98% efficiency, I'm not totally obsessed with max efficiency, but leaning towards max...

And have you guys comment on how sloppy the mastic looks! :p I prefer th look of the tape and they can always retape it at a service.



It's on an IAQ. Speaking of which, question for BT. I...

Here are some inside pics of the completed furnace, the damper on the fresh air intake and the new return. I asked them to have it hard pipe and a low profile against the wall. They said no problem.

This is the second time you have referred to the contract. Wouldn't you want to just discuss it with them first to see what they said. I wouldn't expect any residential contract to spec every...

LOL! I don't think so. Before I signed, he said if I wasn't happy, he would take it out and give me my money back. I think he was serious. It would take a lot for me to even consider asking, but...

Thanks for the feedback. They came back for Day 2. Day 1 was just the install and to get heat pump in. The came back to vent the furnace, put the damper in the fresh air intake and add a return. ...

You guys are a tough crowd :p 4 out of 10 for being sloppy!

[QUOTE=acvrt;2991152]Should I do this now, before it gets hot or take my chances? The better half thinks we should wait till the old system dies. I think that's not a great idea, but there is...

Why are you asking? If you are looking to get work done, wouldn't it be easier just to get some quotes and see of they work for you?

I just did that and IMO, it's a little easier to schedule...

I'll try to get some pictures of the outdoor unit. They installed it with the access door facing out for a couple reasons. One so it could be accessed easily and the other was based on where the...

Here are some after. Furnace is not vented yet. System is running on HP right now.

The Affinity 8T is huge and super quiet. The furnace is tiny!

Here are some before pics

NCToad,

I recently went through the same process. Every spring my wife and I would speculate if the AC would crash and hope for the best. With the tax credit, we decided to replace the AC...

I'm not sure what you are asking. There is a poll on three manufacturers from good installers, yet you list different options of HP and strip heat and furnace and different lines between them.
...

What do they use in unconditioned attics?

Even hacks might hack less with a comfortable space. :D

No one likes to work in cramped quarters. Even though you are paying them, they are still professionals (unless they are hacks :p). I...