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
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
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.
I did have the intelligent thing on for awhile thinking it might be
better. The installers said they always turn it OFF in every install.
The heat pump started coming on earlier and earlier. When it came on
at 3:30am and still couldn't heat the house to 70 by 7am, I turned it
off, opting for gas heat to heat up the house quicker.
Your installers are idiots
How cold was it outside and what was the temp inside when it came on at
3:30?? What is your setback temp??
Last week when it was in the teens here in south Mississippi, my heat was
coming on at 3:30 too... Today it didn't come on until 6:05 because it was
58 degrees last night.... and yes I DO use the intellegent recovery feature
on my stat.... it saves me as much as 18% on my utility bills.
Why the fuck is your house cooling to 64-65 at night with outdoor
temperature at 40???
My house only drops about 2 degrees at night when the weather is in the 40s.
Sounds like you need some INSULATION.
You'll never comfortably heat a leaky barn like that.
I sure would like to know the formula you use to calculate this 18%.
About the only realistic way I can think of is to have an identical
setup running in parallel to your existing, and then chart the
differences each and every day.
Sure, if you said you saved 18% over last year, month etc, but even at
that there's no weather data or setpoint comparisons.
IMO, any supposed 'savings' is nothing but marketing hype, as there's
absolutely no way to verify any savings or not, at least not until you
have identical equipment conditioning identical structures in
identical conditions. Then and only then will you have an accurate
comparison model to guage any 'savings'.
Shut off all of the heat strips here as of Nov of last year, added a second
( open loop wshp ) heat pump as aux instead--looking like probly will be
coming in close to a 50% savings over last year.
Really love that intelligent recovery....currently running the
ChronothermIII units at the shop and in the residence--and when I eventually
get around to adding dampers and zoning the house then will probably use
them there, too.
since all related factors remained exactly the same, ie programming
setpoints, occupancy, yearly weather data, utility rates yada yada,
you can definitively say you've realized an 18% energy savings based
solely on adaptive intelligent recovery?
have you considered being a politician as a second career? :)
based on the first 4 years in this home without a smart stat(it had a
Honeywell, mechanical, auto change-over stat), and tracking the energy
prices, KWH and Therms used, with proper maintenance on the system and no
other changes in the system configuration, then 5 years with the addition of
a Chronotherm III stat, still tracking energy prices, and the KWH and Therms
used by the same system, has resulted in an *AVERAGE* energy usage reduction
in my home of 18%.
You want to see all the bills??
BTW... I currently am using a VisionPro 8000 stat, but only because I wanted
a new toy.
no thanx, I have no desire for the required lobotomy.
I call bullshit!
Your t/stat merely determines the temperature of the room it's located in.
If such savings were possible simply buy changing your t/stat, it would be
front page news, with environmental conservation groups leading the charge
to get everyone to install new stats.
If your heating bills came down, it's for other easons, not because you
installed a new t/stat.
There's no fucking way a t/stat can icrease the efficiency of a furnace by
Too late. It looks like you already paid the 10K. Get another Trane
dealer if that one cant find or fix the problem.
That's kinda stupid of you. Its built into the stat for a reason. So
you dont have to guess how long it will take for your system to heat
up your home. Its also smart enough to know whether it can heat your
home with the heat pump only or if it needs to use the gas furnace to
accomplish this. All this thinking is done for you if you'd just turn
the damn adaptive intelligent recovery option on.
Read above comment. You turned that feature off,
1st stage is heat pump
2nd stage is low fire gas heat
3rd stage is high fire gas heat
High heat will ramp up the blower speed
You need to have someone come out and re-check/change all the settings
to where they belong. You should pay him since you've been in there
"mucking" around with that which you shouldnt have.
The installers turned it OFF by default. They said they always turn it
off because it doesn't work very well. I turned it on myself to see
for myself, and when the system started turning on at 3:30 in the
morning, and still failing to heat the house to 70 by 7am, I turned it
As I mentioned above, turning on adaptive recovery does not do anything
near what I describe in this paragraph. I don't want the heat pump
running at 3 in the morning. It is loud and I don't want it waking me
or my neighbors up. When I described the cycling to the installers,
they didn't have a clue what to do.
So is this then considered a 3H/1C system? Does the thermostat handle
the low/high gas or is it all done independently?
I only changed the adaptive intelligence on/off and the recovery ramp,
measuring how each behaved independently to gauge how it effects the
system. I didn't "muck" with all the settings haphazardly.
really??? and you don't even know what "setback temperature" is??
Call the installing company back and have them send a proper tech out to
correct what you screwed up on the thermostat, and check out the other
At this stage of the game you need to start over. You need to have
everything checked out to see if it is all wired correctly, charged
correctly and installed correctly. From what you've explained Id find
someone other than who you had install it. They are complete idiots or
lazy or both.
The Adaptive Intelligent Recovery feature works very well. It is
designed to save you money by using the first stage heat pump to heat
your home as much as it can. Depending on how far you set your stat
back at night, how cold out it is and the balance point of your home,
your system may come on at 3:30am and even earlier.....much earlier.
It may take several days or more for your thermostat to develop a
memory of how early to start your system in the morning.
Your 14 SEER Trane heat pump is NOT noisey. If it is, it is not
installed properly. They are very quiet.
If your system is wired properly the stat will control all 3 stages.
If the installer were lazy, then the furnace control board dip switch
will control the last stage of heat according to time............and
Yes, you have a 3H-1C system.
As of now, you've wasted a ton of money on a system that isnt working
anywhere near how it should.
Thanks, I figured I'd eventually have to get someone else out here. I
was hoping to learn as much as I can about the system in general from
you folks beforehand so I have some clue as to what to look for.
I can re-enable the intelligent recovery again and see how it goes.
efficient than 2 hours of gas? Is there a general rule of thumb? If
I'm saving a lot with the sole use of the heat pump than I'd feel
better about the long startup.. And yes, the heat pump is quiet, much
quieter than my previous A/C, but at 4am in the dead of night, it can
still wake me up since it's close to my bedroom.
Another thing the installer did that I didn't think was right was
ratchet down the cfm output to try to fix/mask the noise issues. It
was originally set to normal, they dropped it down to medium-low, when
I still complained a week later, they dropped it down again to low.
Won't this affect the efficiency of the system? Should I put it back
to 'normal' since it did nothing for the rumble/vibration issues? They
also have the Comfort-R disabled. Is that something that I should be
I know my way around electronics, is there anything specific I could
check to see if there is any screwed up wiring or settings?
I peeked around the circuit board a bit. Here is what I've found that
It says to jumper W1 and W2 for single stage heating, and it'll use the
time delay to enable second stage. I have W1 and W2 jumpered.
It says for heat pump systems, Y and O should be connected to the
low-voltage terminal board. O is not connected to anything in my
For two speed system, use YLO for low speed, and Y for high speed
connection to the low-voltage terminal board. YLO is unconnected in my
I also see a Heat Pump add-on box attached to the furnace. From what I
can gather, this seems to take the place of the thermostat to control
when the to use heat pump or gas:
"If the outdoor temperature is below the balance point of the system,
and the heat pump cannot handle the load, when the temperature in the
room drops approximately 1-1/2 degrees further, second stage heat is
called for. Second stage turns the heat pump off and simultaneously
brings the furnace on. The furnace will now satisfy the second stage
only. The first stage of the thermostat is still calling. After a
minimum delay of 45 seconds, the heat pump will resume operation. If
the indoor temperature continues to rise, the thermostat will be
satisfied. If indoor temperature does not continue to rise but falls,
the second stage will call and bring on the gas furnace again."
I guess this explains why W1/W2 are jumpered, this add on kit is doing
the work. Why did they choose to use this instead of the system
itself? This might also explain the cycling I experience...
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.