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Posted by Noon-Air on December 12, 2006, 7:33 pm
>I had a new Trane system installed recently in my home. It is an xl14i
> heat pump and xv90 gas furnace. When the heat turns on, there is a 1
> second rumble/vibration somewhere in the furnace, and about a 2 second
> rumble when the system shuts down. I've had the installer out 3 times
> and they can never fix it. Seems like they make it quieter, but in a
> couple days it's back. The furnace is in the garage and backs to one
> of the walls of our primary living area, so it is rather annoying to
> hear the thing rumble on and off. Has anyone else had similar issues?
> I don't want to pay > $10K for this new system, which is supposed to be
> so quiet I won't even know it's on (yeah, right).
>
> Also, I have some issues with the system heating the house in the
> morning. I have a 2500 sq ft home, 2 floors. The thermostat is
> upstairs. On a typical morning, 45 degrees outside, house is at around
> 65. At 7am I have it programmed to heat to 70. I have the adaptive
> intelligence thing turned off. First thing it does is start up the
> heat pump. After a minute or so it switches over to gas, then it
> cycles back and forth between heat pump/gas, and it ends up taking
> about 2 hours or longer to heat the house up 5 degrees to 70. I went
> into the programming of the thermostat and changed one option to make
> the recovery ramp more aggressive, and it seemed to help some, keeping
> the gas heat on longer, but it still cycles back and forth. I would
> figure the system would be smart enough to immediately go to gas, ramp
> up quickly as possible to 70, then switch to heat pump for the rest..
> Is that too much to ask for? Is there any way I can program this
> better?
>
> One more thing, how do I know if the second stage heat is actually
> working? Should I hear the furnace speed up or feel more air coming
> out of the registers? Does second stage heat system work with both the
> heat pump and gas, or just when the gas is running?
> Thanks for any help
> Jason
>
first off, turn on the intelligent recovery feature on the thermostat, and
give it a couple of weeks to learn when to turn on the system to be at the
desired temp at the desired time like it was designed to. with this feature,
it will try to use the *primary* part of the system(the heat pump) to bring
the temp up to your comfort level, then only use the furnace if the temp is
not at the set point at the desired time. Only one or the other should run
at any given time *NOT* both.
Your installer should have explained all this to you.
Set the thermostat, and let it do its job.
BTW... short recovery time = higher energy usage and higher bills.
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