Hydronic Baseboard long run questions

[Kaizen]

I just finished installing a 45 foot run and a 45 foot return of 3/4 copper baseboard on the second floor. There was never baseboard up there before. Due to my houses construction this run and return back to the same wall was the easiest thing I could figure out. I would say i'm a mediupm to good solderer. I have about 20 joints to solder and i obviously want to get this right on the first try. Just want to run the plan by the community and make sure it makes sense. All joints and fittings were sanded and fluxed. I plan to begin where it comes up and end at the other side where the picture of the return is as i'm thinking the pipe will expand as i go. I will use heat cloth under and behind the fittings. The joints are at least 6 feet apart but with the smoke exhausting to the vent at the end will it melt the flux in the joints i have not gotten to?
At the end I had to use a brass fitting so i could use an air valve or i'd never be able to bleed it. I have a street elbow and small piece connecting the two. With the brass taking much longer to heat up how should i apply heat and work this joint? If i start at the bottom will the longer heat soak of the top brass fitting remelt the bottom?

 

[TurnipTruck]

I did the same thing in three places in my remodeled house. I would recommend soldering subassemblies and pressure test with sharkbites rather than soldering it all in one fell swoop.

 

[Kaizen]

I did the same thing in three places in my remodeled house. I would recommend soldering subassemblies and pressure test with sharkbites rather than soldering it all in one fell swoop.

It goes through 3 walls so it was a real pain to put in. I only have like an inch of play at that one corner i showed so i thought this would be better. Does that bleeder work? I thought it had to be the highest point? I'm contemplating using a air scoop you find on a boiler. Personally never had luck with the sharkbite fittings.
Definitley going to put air in at the drain on this line in the basement and soap up every joint. I just redid this whole upstairs and if i get a leak i'm jumping out these beautiful new windows i just put in.

 

[brewchief]

I go low to high, stick a heat resistant blanket behind and have some wet rags and a squirt bottle of water at the ready, when done inspect with a mirror.

If it's piped properly at the boiler there is really no need for a vent, I would not put any type of auto vent as they have a higher probability of leaking then a simple xoin vent.

 

[Kaizen]

I go low to high, stick a heat resistant blanket behind and have some wet rags and a squirt bottle of water at the ready, when done inspect with a mirror.

If it's piped properly at the boiler there is really no need for a vent, I would not put any type of auto vent as they have a higher probability of leaking then a simple xoin vent.

Good point on the vent. I should be able to isolate this branch and run full water pressure through it to fill it and get it moving. My concern is this is the highest point so in theory any air not caught by the boiler can fill up the upper pipe. Just trying to plan for worst case scenarios and the easiest fix for them.

 

[TurnipTruck]

I installed that pipe plug as a drain, since the 4’ baseboard is in an otherwise unheated underground well house attached to the basement, just in case the heat experiment failed.
The sharkbite comment was intended as a way to pressure test subassemblies, not as anything permanent.

 

[Ford12508]

If it's piped properly at the boiler there is really no need for a vent, I would not put any type of auto vent as they have a higher probability of leaking then a simple xoin vent.

A loop where the radiators or baseboard were fed by mono flow or venturing tees would require bleeders at the highest points for proper bleeding

 

[fitter30]

Copper expands 1.3" per 100'. 70° to 180° make sure there's room for expansion. They do make expansion compensators (pricey).

 

[fitter30]

Delete

 

[Kaizen]

Thanks all for your guidance. As usual the anticpation and concerns wash away with the first joint. Didnt burn the house down and kept the whole floor windows open so at 25 degrees I didnt have any bleed over heat isses besides the last one with the brass elbow that came out ugly. I'll be connecting it in the basement and putting air at it to check for leaks soon.