internal traps

[roofdude]

Hi all, I've seen some old carrier units with internally trapped drains. My question is: if an external trap is added will this cause drainage issues? Also there is usually a sticker or something to notify the installer that it is internally trapped. If the sticker isnt there how do you identify the internal trap? I was thinking it was the shape of the pan. Thanks.

[The Doctor]

There will almost assuredly be drainage problems. Your results may vary.
There were stickers on most of those, once upon a time.

[rscamaro]

If the sticker isnt there how do you identify the internal trap? I was thinking it was the shape of the pan. Thanks.

I remember those, they originally came with stickers that said it was naughty to put traps on them. The way to tell is by looking at the pan itself, as it was a totally different design than just the strait pan under the coil. This subject has come up before, do a search, I sem to remember something about using a finger...

...Ron

[timebuilder]

Yes, you stick your finger in the threaded opening. If you hit a plastic wall, that's the trap.

I have seen some units where an idiot poked a hole in the plastic, so a conventional trap was needed after that.

[valdelocc]

The drain opening was higher compared to a regular rtu and there was a sticker right above it, after a while they get plugged up and leak, by the time that happens the sticker is gone and the tech responding to the call thinks the reason for the condensate leak is the "missing trap" and put one there.
I think it was a crappy design.

[OldSchoolMech]

What Carrier Rooftops are these units you guys are talking about? Model# Pics??

The Green weather makers? Or the Grey ones?

[valdelocc]

What Carrier Rooftops are these units you guys are talking about? Model# Pics??

The Green weather makers? Or the Grey ones?

they were green,havent see one in a long while, they came out 15-20 years ago.

[timebuilder]

What Carrier Rooftops are these units you guys are talking about? Model# Pics??

The Green weather makers? Or the Grey ones?

Green. Plenty of them still out there. Retail is the the land of AC dinosaurs.

And it was only the guys who didn't know what they were doing who had a problem with them. Clean the pan like you are supposed to and no problem.

[2sac]

What Carrier Rooftops are these units you guys are talking about? Model# Pics??

The Green weather makers? Or the Grey ones?

I believe pre 1994 CYA and verify with Carrier/Bryant

[roofdude]

Thanks to all for the reply. Yes these were the green weather makers. Year 1990, don't remember model #. Sounds right, new customer location complaining of recurring water leaks. The units had traps on them.

[timebuilder]

Thanks to all for the reply. Yes these were the green weather makers. Year 1990, don't remember model #. Sounds right, new customer location complaining of recurring water leaks. The units had traps on them.

Once you confirm that no idiot has put a hole in the trap wall, remove the traps permanently and flush out the pans. When you think you have flushed too much, it's probably just right.

[hvac wiz 79]

Weathermakers with the rubber doors .. Can't speak for all weathermakers but more than i prefer to still see

[hvac wiz 79]

I keep a 4' piece of 3/8" copper with a 1/4"service port brazed in on one end. Fits nice when needing to unplug these & other types of drains with nitrogen on a service call. If I'm bringing a hose on the roof for a pm ill do it then flushing back n forth

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