19 seer Trane problem

[bullshoot]

Just wondering if anyone has messed with the 19 seer Trane (2tw29030, two compressor, two stage)units much? The company I work for installed one a few months ago and there has been nothing but problems with it so far. The problems is, it is not matched with the correct air handler. It should be hooked to a 40 air handler and it is actually hooked to a 37 (twe037ebfb1). I think the 40 has a lot more capacity.
This unit is a 2.5 ton system with 9 runs. It runs high head pressure all of the time. We have the blower speed set up as a 3 ton to get the head pressure down some. We have also taken out a couple pounds of refrigerant. (it holds a little over 19 lbs.)
I also noticed something last time i was there. The recommended line sizes are 5/8 and 3/8. The 3/8 line is actually 1/4.
I know that the sure thing is to install the right air handler, but can anyone suggest something else that might help?

[AllTemp]

[i]
I know that the sure thing is to install the right air handler, but can anyone suggest something else that might help? [/B]

Come on this sort of hackery only happens to Jani Junk...lol

[beenthere]

Proper line set size would help.

The factory charge is 19lbs, or did your company over chare it.

[jacob perkins]

Originally posted by bullshoot
. The 3/8 line is actually 1/4.
something else that might help?

No,Ive never worked on one of those,but I aint afeared to!
Get the book out and check all the install differences you can find.Then make the changes before it is too late.

I would verify duct design and airflow as a start.What does the return look like?

[jacob perkins]

Originally posted by beenthere
Proper line set size would help.

The factory charge is 19lbs, or did your company over chare it.

It is 2 compressors?

[dmoneyc22]

the 19 seer you are discussing can be installed with the 37e air handler however i think you may have the wrong sized lines in the sytem
you need to charge the system in high speed to get it correct
also do you have the trane t-stat for this system installed have seen problems with the wrong stat installed??
as you know the dip switches in this air handler should be set properly as well

[Edited by dmoneyc22 on 03-19-2005 at 08:43 AM]

[mjr]

It's not a 19 SEER anymore!

[41gasman]

mjr. Now that was funny!!! :}


41GASMAN

[BobbyBJr]

Oh my, we have installed many of these machines and learned the hard way too that the instructions are not just suggestions. On every single one of these installs you should have the correct air handler, the correct line size, the correct tstat, the correct air flow, the correct charge and the correct everything else. If not, you'll spend more money is gas running back and forth that you would have spent to install it correctly from the get go. The biggest problem we had was when our estimator decided to not change the lineset that was too small. After the third compressor in the first year, he realized the error of his ways.

Bobby

[berad]

1/4" liquid line will definately make the head pressure jump. If it did it to r-22 why not 410 a. Inside the unit there is a little envelope. It contains a packet labeled service facts. This little guy has everything. Line sets sizes, charging info, breaker size. It even has charts that take your given indoor unit, outdoor unit, and operating condition info and will tell you exactly what your pressures should be and your supply air temp. Service facts come in every Trane outdoor condenser.

[bullshoot]

Thanks for all the replys. I can always count on getting some good ideas or remarks and some fast help right here.

Accoring to the fact sheet inside, the only air handler listed for this application is the 40.
It is a two compressor model with r22.
The unit was charged with 19.5lbs. as listed on the cabinet and about 6 onces was added for the extra line length. There has been a total of about 5 lbs taken out.....It has a regular Trane tstat.

One of the problems besides the miss matched air is the air flow. There are 9 runs and that is about the very minimun amout of air. There are two returns and they are correctly sized. I think it would benefit from at least one more run.
It is a two compressor model with r22.

I can see it is not right, but cannot do anything about it. I have not been doing this long and no on is gonna listen to me.

if "It's not a 19 SEER anymore!"....what is it?<---- Like i said, i am new at this.

[mark beiser]

It is suposed to be installed with the TWE040E air handler, and is suposed to have a 7/8 vapor line and 3/8 liquid line.

According to my Trane performance data CD, that air handler and refrigerant line sizes are the only ones the 2TWZ9030 heat pump are rated with.

The smaller coil in the air handler your company installed my have to low of a coil volume compaired to the monster coil in the outdoor unit, so you get high head pressures and possibly even a pulsing, throbing, or buzzing sound coming from the indoor coil when the system is in the 2nd stage heating mode.

The drasticly undersized refrigerant lines will give you all the usual problems that undersized lines cause.

Your company needs to bite the bullet and put in the correct air handler and refrigerant lines. Call it a learning experience.

Matched with the correct air handler and refrigerant lines, the system is listed at 17.9 SEER with an HSPF of 8.80, high COP of 3.38 and low COP of 2.18

We have put in quite a few of them without any problems.


[Edited by mark beiser on 03-19-2005 at 12:56 PM]

[J4]

The system requires other than "regular Trane heat pump thermostat".