6 Ton Trane

[Juleous]

An inverted trap on the liquid line would serve no purpose.

Are you kidding me? I didn't say liquid line, I didn't think I needed to say suction line.

[Juleous]

I like to see the filter after the sight glass also

It is after the sight glass.

[bigtime]

Are you kidding me? I didn't say liquid line, I didn't think I needed to say suction line.

You dont need one in the suction line either. Oil is not going to drain down the refrigerent pipes to the evaporator. I dont know of any manufacturer that calls for an inverted trap. If you know of one that does let met know so that I can learn something.

[orlandotech]

You dont need one in the suction line either. Oil is not going to drain down the refrigerent pipes to the evaporator. I dont know of any manufacturer that calls for an inverted trap. If you know of one that does let met know so that I can learn something.

Well as far as I know, in most residential installations they don't require it anymore but in commercial some manufacturers will in certain situations. I had to install two on a lineset once for a Liebert system I put in for a LAN room in a building. The lineset had a vertical rise of 40+ feet so they required a trap about every 20 foot and we had to upsize the line size to 1 1/8" on a 3ton due to the length (we were maxed out on the total recommended line length too).

If you look at some of the IOM's for larger, 2 stage Carrier units, they will spec that you use a double suction riser with traps. Trane and Lennox may have something similar as well ( I can't really remember right now). I did a changeout on a resi condo setup once (2 ton) that had an oil trap on it at the AHU. To my surprise, when I pulled the trap off the lineset it didn't have a drop of oil in it and this unit was about 3 floors below the CU on the roof. I think technically there should be one in all installs where the CU is above the AHU but most people don't bother with it now, especially a double suction riser. It doubles the install labor and adds a significant amount to the materials cost plus the installers actually have to know how to pipe it in correctly. I would have to study a piping guide pretty good to get a handle on it since I've never had to install one before. I doubt you would see any contractor installing one without the engineer standing over him to watch it go in or at least threatening them with a redo.

[Juleous]

Proper piping practice is all I was saying, and a reverse trap at the top of your vertical rise so all the oil you get there stays there would be proper practice, plus if you have over 20 vertical feet you need to think about oil traps at all points in the system. That said oil trap practice is changing due to the increasing use of Poly oils, but still check with the manufacturer cause I had to cut open the wall on the second floor of nice new building to install an oil trap cause LG wanted one on their ductless split. The rough-in tech did not read the instructions where it mentioned this so I had to weld in a very tight enclosed space. If I didn't do this and we started to eat compressors then what are we going to do, most likely no one would know there wasn't a trap if I didn't take the extra time to find out for sure.

[green jumper]

Last I checked trane didn't require a trap until after 60ft or so on that size of unit. But that was a few years ago.

Also surprised to see a 6ton in that cabinet I thought they changed to the commercial cabinets at that point.

Would of liked to see a better support for the disconnect, i have a feeling it'll be kissing the ground soon.

[koldair]

It looks like a builders model, also shouldn’t the sight glass be "after" the drier? Maybe secure the whip also.