Navian + iFlow advice on new house install

[iflower]

I have a Navian boiler with an iFlow air system that provides air around the house via high velocity conduit. It's just over a 1 year old property and I just moved in and found the heating suboptimal.

I have had a plumber indicate the system is designed and installed incorrectly, which the builder disputes. I am filing for a warranty claim but curious if I could get some internet stranger bias or advice one way or another.
Issues:
Heating in most rooms is poor, room does not reach temperature set point on thermostat of 23c
Boiler/heating comes on and off frequently (every 20-30 mins)
No return airflow from upper level into boiler/hvac, possibly causing balancing/pressure issues
There's open ducting going from the mech room directly outside
Boiler intake not connecting to fresh air inlet

The plumber claims
the high velocity ductwork is incorrectly designed and needs to be re-done
there's leaking or missing ducts in crawlspace
gas line code violations
incomplete iFlow setup
no recirculation
pipes un-attached (pressure relief valve?)
incorrect material used (90' ptex connectors?)

Can anyone provide their opinion based on the photos and confirm the plumbers concerns?
Thanks

[samihabib]

What a shit show , the builder needs to sued to oblivion with that install, total hackery, primary loop is wrong , I don't see a secondary circulator which is another issue. Expansion tank no where to found

[Porcupinepuffer]

I like the air eliminator that's not only installed horizontally when it needs to be vertical, but at the lowest point on the air handler.
And is the red pex actually attached to the pressure relief outlet at the boiler? I can't see a fitting to transition it to the pex. That would be a safety and code related violation for sure.

I can also just imagine what would ever happen if a/c was to be added to that existing a/c coil that isn't connected. I'd bet it isn't made for horizontal use.

[Sergroum]

Oookey.


Dude.  This is beyond shit installation. This is a "guy helped someone install stuff for a week and then decided to do it himself" level of installation.   These aren't just mistakes, there is a distinct lack of understanding on how things work.

I don't think you should rely on us to point out every mistake. There ARE mistakes. You should hire someone to go in and write you up a report on everything, document it properly, etc.

[Hgye]

Where are you located?  That is one of the worst hack jobs I have ever seen.  You have so much wrong.

[NoDIY]

100% have a licenced gas fitter in to go over everything. Get it in writing and expect warning tags to be written.

[Sergroum]

I'm actually using these pics to scare my colleague techs into nervous gigglesnort laughter.