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Old 01-09-2011, 10:59 AM   #1
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


My unit is a Trane XL 1200 gas pack and when the temps get down in the low 20's this unit just has a heck of a time keeping the house warm (66 degrees is the setting and it was 63 in here when I got up this morning). The air from the register's is noticeably cooler when it gets this cold. The house is about 1700 sq ft. heated space. I do know that I have a "spider" duct system that is probably a major part of the problem. I have been in the crawlspace and checked to make sure none of the connections have come undone.I don't know if the heat exchanger is on it's last leg or not because I haven't had a look at it recently. But I wanted to see if you guy's could tell me anything else to look for. BTW, I have recently changed the filter.

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Old 01-09-2011, 11:49 AM   #2
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


check for codes on control board when system not keeping up

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Old 01-09-2011, 11:57 AM   #3
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


Will do. I have replaced that board twice too, LOL. No more trouble with it in the last few years though
I'll set the T-stat for a call for heat and see if any codes pop up. Of course now the outside temp is up to 34, so I doubt there will be any codes.
One other thing I have noticed when the unit won't keep up, is that the you hardly see any smoke from the exhaust fan of the unit. Does it make sense that it just gets so cold that the natural gas isn't spreading out on the HE to produce enough heat?

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Old 01-09-2011, 12:16 PM   #4
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


Just went out while it was calling for heat and had a look at the board. According to the info that I have for this board it is operating as normal (lid green). That said, I could lay my hand down on top of the inducer motor fan exhaust and it was luke warm. Shouldn't that thing be pretty hot?
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Old 01-09-2011, 12:31 PM   #5
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


it depends... with unit calling for heat and it has stopped producing heat then check the board. have you done that? check for air leaks where your ducts hook up as well.
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Old 01-09-2011, 12:55 PM   #6
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


It's heating like it normally would now that the outside temperature is above 30 degrees. But when it's colder than that it just can't keep up. No bad connections in the duct system. I'll have to check the board tonight after the temp drops to see if it is producing any codes.
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Old 01-09-2011, 01:03 PM   #7
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


is the gas pack a h/p with gas backup or is your only heating source gas
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Old 01-09-2011, 01:04 PM   #8
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


All NG.
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Old 01-09-2011, 01:55 PM   #9
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


Could be low gas pressure. Something restricting the manifold.
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Old 01-09-2011, 02:41 PM   #10
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


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Could be low gas pressure. Something restricting the manifold.
There could be a restriction in there somewhere. I'm just wondering why it the trouble always starts when the outside temp gets into the low 20's or colder. Seems like if there was a restriction it would happen a majority of the time. I was just out there and I couldn't put my hand near the exhaust because it was hot.
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Old 01-09-2011, 04:49 PM   #11
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


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Originally Posted by DIY DUDE View Post
There could be a restriction in there somewhere. I'm just wondering why it the trouble always starts when the outside temp gets into the low 20's or colder. Seems like if there was a restriction it would happen a majority of the time. I was just out there and I couldn't put my hand near the exhaust because it was hot.

Restriction to gas flow, wouldn't show up as much at warmer temps. Since just enough gas could be flowing to heat the house.
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Old 01-09-2011, 05:15 PM   #12
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


My Trane XL1200 was a heat pump. I believe you have the equipment model incorrect.
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Old 01-09-2011, 07:17 PM   #13
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


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My Trane XL1200 was a heat pump. I believe you have the equipment model incorrect.
The number is correct and mine is a gas pack. I've worked on it enough times to easily remember that number, LOL!
Actually Trane built a gas pack, gas/electric and heat pump with the same model number.

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Old 01-15-2011, 01:05 PM   #14
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


After a week of the unit keeping the house at 66 degrees as set on the TS, this morning the temp inside dropped to 64. Today's outside temp was 45 degrees when I went out to try and do some trouble shooting. Again, I could put my hand over this inducer exhaust fan and it was luke warm. So I took the panels off and check the board. All was showing normal there, I then tapped on the regulator to see if there was a blockage or whatever. Unit continued to run luke warm, so I then flipped the breaker to reset the system. When I started it back everything sounded normal (inducer fan buzz from ig-nighter then the whoosh from the HE lighting. While it was running as "normal" I noticed that it would sound as if it was relighting in the HE chamber (no buzz from the ig-nighter when this was happening) this happened a few times and didn't happen again. The inducer exhaust got real hot, too hot to touch and has been running normally so far. Does this still sound like a regulator issue or does it sound like the HE is on it's last leg.
Oh yeah almost forgot, I was getting a bad odor in the house where the gas wasn't completely being burned off.

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Old 01-15-2011, 01:55 PM   #15
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2.5 ton Trane XL 1200 ain't keep'en up with the cold


good possibility of bad HE

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