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Old 06-04-2012, 06:04 PM   #1
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Trane 3.5 ton HVAC


Issue is when the Trane HVAC is in standby mode. The plenum and ducts will increase up to 150 degrees F. If the 240 AC power is removed from the system at the breaker the heat in the ducks will drop to normal. About 84 degrees when a outside temp of 97 (Texas).
A license Trane contractor has looked at it three times and can't find what is causing this. The last thing that was done was the tech removed the power to all the heating coils. Didn't help. All components of the system was replaced 5 years ago and work normally until this spring.
Every month starting in April the power Kw total has double from last year.

What would it be?

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Old 06-04-2012, 06:21 PM   #2
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Find another tech. If power is removed, and heat load goes down, and the air temp in the duct drops. sounds like either aux heat is kicking in, or they are missing a very simple problem with a easy solution.

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Old 06-04-2012, 06:42 PM   #3
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Trane 3.5 ton HVAC


Gotta have some power still going to the strips, from what your describing. Possibility that one of the strips is blown and shorting to ground, so that its being fed 120 volts, and heating constantly. Could also be that the second set of aux is being energized by a stuck relay, that doesn't control the fan.
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Old 06-05-2012, 12:05 PM   #4
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Thanks for the suggestions. I have a different Trane certified service company coming out.
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Old 06-05-2012, 12:42 PM   #5
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Instead, get some ole timer that knows hvac system, vs. some company that is locked in by the manufacturer as to what limits they have, when handling service calls.
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Old 06-06-2012, 08:14 AM   #6
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Trane 3.5 ton HVAC


Was talking to my next door neighbor yesterday and in March the house on the other side of him got hit by lighting. Caused a lot of damage. The next door neighbor also had damage. This was around the same time my Internet provider equipment stopped working and was replaced. I wonder if my system was also damaged.

Maybe I'm grabbing at strews.
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Old 06-06-2012, 12:21 PM   #7
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Could be. Lightning strikes cause emi and wreck havoc on electronics. Also make sure your electrical system is properly bonded to earth ground.

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