Reply to Thread

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

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.

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.

Originally Posted by bigtime

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.

Originally Posted by Juleous

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.

Originally Posted by wildtech

I like to see the filter after the sight glass also

It is after the sight glass.

Originally Posted by bigtime

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.

I like to see the filter after the sight glass also

Originally Posted by Juleous

I do not agree about the quality of the installation, the liquid tight isn't strapped down, there is no inverted trap to ensure the oil stays in the unit and not free drain down into the evaporator coil, the liquid line looks crooked and the sight glass is before the drier. Also it's recommended these days to put the drier close to the metering device as possible. On my job site that would be a fail. Plus I keep looking at that disconnect floating out there. I would have secured it to the unit, probably would have put something new and smaller on.

One last thing sounds like you are on compressor number 3 or 4? Just my cents, sorry if I broke any of your forum rules.

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

I do not agree about the quality of the installation, the liquid tight isn't strapped down, there is no inverted trap to ensure the oil stays in the unit and not free drain down into the evaporator coil, the liquid line looks crooked and the sight glass is before the drier. Also it's recommended these days to put the drier close to the metering device as possible. On my job site that would be a fail. Plus I keep looking at that disconnect floating out there. I would have secured it to the unit, probably would have put something new and smaller on.

One last thing sounds like you are on compressor number 3 or 4? Just my cents, sorry if I broke any of your forum rules.

Originally Posted by daytonafan

Ive been installing Trane equipment since 1992 and I never knew they had a 6ton split cooling unit. I learn everyday. Great looking work. What size lineset does that require? 1 1/8th inch I'm guessing.

Yeah I don't know exactly how big they go in split design but I've worked on a Carrier 20ton split before. The 6ton is 3-phase and needs 1 1/8" suction and has the same cabinet design as the residential units. 7.5 ton and up have the commercial grade cabinets.

Ive been installing Trane equipment since 1992 and I never knew they had a 6ton split cooling unit. I learn everyday. Great looking work. What size lineset does that require? 1 1/8th inch I'm guessing.

copper spun driers don't have enough dessicant in them to be true driers. More of a prefilter. Shouldn't be a problem as long as you pulled a good vacuum on it. Trane does usually allow suction oil traps anymore. The increased suction velocities due to higher compression ratio compressors makes it not needed. Nice job.
MK

An extra dryer is not a problem. Nice job.

Originally Posted by eo1scw

i have a trane AC UNIT. its a heat pump model built 10-2006,
model number 2TWA0072A3000AB. i'm told its a 6 ton unit. long story, but i bought this thing for my house and then found out i can't use it because its a 3 phase unit. i paid 1000 for this thing. i've since bought a rooftop package unit for my house, but don't know what to do with this unit. its never been turned on. i've had people come and look at it and they checked the triggers to see if its ever been turned on and they showed me that the electricity has never been applied. any help here would be a blessing. thanks

Well sorry to hear that. You might have a hard time getting all of your money back out of it. If it were me I would go around to some of your local A/C shops that advertise that they do commercial work and see if they would be interested in buying it. Take some good photos of the unit and as much model and serial info as you can to help you sell it. As long as it has never been installed, you stand a better chance of recovering more of your money than if it was installed previously. Good Luck!

i have a trane AC UNIT. its a heat pump model built 10-2006,
model number 2TWA0072A3000AB. i'm told its a 6 ton unit. long story, but i bought this thing for my house and then found out i can't use it because its a 3 phase unit. i paid 1000 for this thing. i've since bought a rooftop package unit for my house, but don't know what to do with this unit. its never been turned on. i've had people come and look at it and they checked the triggers to see if its ever been turned on and they showed me that the electricity has never been applied. any help here would be a blessing. thanks

Originally Posted by cobitech

OrlandoTech,
You are absolutely right! It does indeed have a copper spun liquid line drier going vertically inside the cover.

It is in series with the one that I installed, but I don't see pumping the unit down and recovering refrigerant unless it is adversley effecting the operation of the unit.

Glad you found it. It won't affect the initial operation of the unit but over time it could fool a tech if the factory drier plugs up since the restriction would be downstream of the service port and he doesn't think to check for it. This is why it's a bad idea plus like someone else said you an get a slight pressure drop in the system from the extra drier and the added refrigerant you need to use to charge up the system.

OrlandoTech,
You are absolutely right! It does indeed have a copper spun liquid line drier going vertically inside the cover.

It is in series with the one that I installed, but I don't see pumping the unit down and recovering refrigerant unless it is adversley effecting the operation of the unit.

Originally Posted by RyanHughes

Okay, I'm confused now. So if there are two filter driers it won't hurt the system? I'm sure this happens many times, doesn't it? If someone could clarify the potential issues with this and whether or not it will harm it that would be great.

In my early days of doing installs ( i've been in for 6 years ) I would install a drier on the liq. line all the time and have never had any callbacks for this extra item. I did it not knowing that the factory installed one already or I would peek into the unit and not see one and assume that it needed one. I learned later that on most equipment now it's not needed. As I stated before, it is not the best way but it will not cause any detrimental harm to the system IMO.

cobitech:

On the trane CU's you cannot see the drier by peeking down in through the top. They are mounted outside of the condenser coil on the side behind the quik access panel to the left of the control box. It's the only panel that has two screws along the vertical edge. When you remove them the access panel easily swings open and is removed. On the heatpump models the reversing valve is located here as well. Their mounting location is what used to fool me too. I thought all manufacturers put the guts to the system inside next to the compressor until I looked closer one day and saw the drier. It had a directonal arrow ink printed on the side of it. Oops. live and learn I guess.

Nice,neat install.Next time check for dryer inside though.Really looks good.