Trane Air Handler Fan Constantly Running

loamyroots11

Got it, I’ll spray it down and see if I can locate it, thanks!

mattmia2

are you sure the caps on the service valves were tight before you closed them?

loamyroots11

I had slightly tightened the caps on the service valves yesterday before I pressure tested the entire system. And I'm pretty sure I sprayed the caps too to check for bubbles, but I can't remember exactly as I checked so many different areas.

However, after I pressurized the entire system to 150 PSI today, I removed the caps (in order to ratchet the service valves closed) and did not hear any hissing sounds coming out of the service valves.

EBEBRATT-Ed

The other place to check is the compressor motor wiring terminals. They are not usually a problem but if you can't find the leak anywhere you might check.

Microchannel condensers do not have a good track record and evaporator coils are a prime suspect as well.

If you replace it I would go R-32 Daiken/ Goodman.

R454B price is way out of wack.

Watch some of Steve Lav's recent videos on you tube he talks about it as well

loamyroots11

Good to know, thanks! Watched a few videos, looks like I could try using MAP-Pro torch and some aluminum brazing rods to patch the coil if I can identify the leak. A few people even posted just patching it with JB MarineWeld, while certainly easier, I'm not sure how long that would even last.

Yeah I saw Steve Lav's and a few other guys discussing the topic. If I end up needing to replace this system or another in the near future, I'm leaning more towards R-32 Daiken/Amana/Goodman.

Would it be worth finding a replacement condenser coil or even replacing the entire condenser to hold off a complete system replacement for a few years until supply issues improve?

ratio

I've replaces no fewer than two compressors that blew out the terminals (& sprayed burning oil all over the roof!), just in time for the new A2L refrigerants.

Spray thickly along the connection between the extrusions (fins) & the manifolds on either end, inside & out. Also spray any dings you might see on the faces of the coil. 120 lbs will drop faster than lower pressure for the same leak, but if the leak is bad enough the soap will be blown off without forming bubbles. That'd be a pretty big leak, though.

It's possible to repair Microchannel coils, my success rate is about 60%. On the failures, I end up with too much melted Al on the accessible side of the break so I can't get to the back side of it. Probably a problem with my technique.

mattmia2

I want to see how this turns out.

loamyroots11

Plan is to tackle the condenser on Saturday, will definitely keep you posted!