Hello! A problem has arisen.

I have removed an old cast iron pipe drainage stack because there is a new stack.

I thought it was completely unused but it turns out when I removed the last part in the attic that the ftx unit has its drainage on that stack...

What can I do now to fix the drainage?
 
Insulation and a white cable in an unfinished wall space, with wood shavings on the ground.
 
Not much to do other than directing the drainage to another outlet, e.g., the ventilation of the sewer if such exists. It's enough to make a hole, insert the pipe, seal around it, and let it drip into the ventilation. Just make sure you have a suitable slope on the pipe and that it is well insulated all the way.
 
Becomes very troublesome. The new trunk that remains is much more difficult and further away from the ftx aggregate. Unsure how I will manage to pull it with a good slope..
 
And you don't have a floor drain in any room "downstairs," so you can go into the wall a bit and then out to the well?
 
No, it will take about the same time as going onto the new trunk. Is that gray insulation that you just put around the pipe enough to prevent it from freezing?
 
B bighenk said:
No, it's about the same distance as going into the new line. Is gray insulation that you just put around the pipe enough to prevent it from freezing?
There's likely no significant risk of it freezing. Condensation water from the heat exchanger only comes in drops.
Suggestion: start by placing a bucket underneath to get an idea of the water amount, so you can size the drainage accordingly.

By the way, what is "such gray insulation that you just put around the pipe"?
Foam plastic? If so, it should work fine.
 
Just checked my condensate drain. It is insulated with about 3 cm of glass fiber with paper for the first half meter, then it dives down under the attic insulation on its way to the vent pipe. It's been working well for over 30 years, so it's probably sufficient.
 
Managed to fix the problem! Wasn't super easy

A white insulated pipe installed under a roof with exposed wooden beams and dust, part of a home renovation project involving plumbing.
Dug away the insulation in the sloped roof until I reached the blåbetong
Insulated pipe passing through a hole in a sloped attic wall, with wooden beams and concrete blocks visible around it.
Drilled through the hole and slid over pipe insulation before I drilled into the drain
Close-up of insulated pipe against a concrete wall in confined attic space, showing part of a home renovation project focused on drainage.
Pipe with brass coupling joint in an attic space surrounded by wood shavings and insulation materials.
Then I connected it with the pipe in the attic

..
Narrow naltajävulst in the side attic to succeed in drilling up
 
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