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  1. #1

    Trane x15 trane with xv80 gas furnace

    I purchased a new x15 trane with xv80 gas furnace. I'm noticing that the motor tends to ramp up to quite loud right before it shuts down. Is this normal?

  2. #2
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by iid2012 View Post
    I purchased a new x15 trane with xv80 gas furnace. I'm noticing that the motor tends to ramp up to quite loud right before it shuts down. Is this normal?
    It should not ramp upwards. What is the model # of the outdoor unit?

  3. #3
    Quote Originally Posted by second opinion View Post
    It should not ramp upwards. What is the model # of the outdoor unit?
    I purchased 2 outside units, 2 gas furnaces and 2 coils. Trane, 4 tons, both variable speed fan, 16 SEER, 13 EER. The model numbers for the outside compressor, furnace and coil are:
    4TTR5049E100B
    TUD2D12089V5VB
    4TXCD009CC3HCB

    I have a few concerns - I was told that with the variable speed I will hardly ever hear the fan on. When the a/c kicks on, the low fan is on at first then immeditely ramps into a louder fan. Runs for 10 minutes or so at that speed and right before it shuts off it ramps even louder then shuts off. I don't understand why my motor would run so high if my inside temp = set temp. Shouldn't the low fan run most of the time since the desired temp is already achieved?

    I also don't understand why the motor blows really hard right before shut down. That makes no sense to me. I would think I'm using more energy for this. I purchased this product to save energy!

    Also, I'm confused on how I should be running the fan - On, Auto or Circ. I live in AZ where it was 110 degrees yesterday. I'm hearing conflicting stories on most efficient way to run the fan with the units I've purchased.

    Thank you so much for your assistance!

  4. #4
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Ask the company to come back and verify the settings, for Comfort R, and the ventilation mode.

    Rather large furnaces and AC. What size home is it?

    What model thermostats?

  5. #5
    2800 sq ft of living area. I originally had 3.5 tons for both units and I was told that 4 tons with variable speed motors would not be overkill in my house. I was told this repeatedly by many dealers. The thermostats are Honeywell Vision Pro 8000s.

    Thanks.

  6. #6
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    These are 2 stage units?

    Sounds like the "fan" only speed is set to 100% rather than the 50% speed and a short fan off delay is enabled.

    Wow, 8 tons for 2800 sqft. Holy cow. I'd expect 6 tons to be plenty even if this was Houston, TX. Where are you located. some entire 3000 sqft homes can be cooled with 4 tons.... mine included.

    If you actually NEED even 7 tons of capacity, your highest summer electric bill should be at least $400-500.

  7. #7
    I live in Scottsdale, AZ so it is pretty hot here. I had 2 3.5 ton units for my house and I was paying over $400/month in electricity while keeping both units at 87 degrees from 8AM to 2 PM, then 85 degrees after 2 PM. My old units were 26 years old and needed changing.
    the 4 ton variable speed units I purchased are 2 stage units. What I don't understand is why the fan blows mostly loud during it's approxmate 10-12 minute run. With a variable speed fan/motor, isn't it supposed to run at a slower speed to be more efficient? I'm just wondering if this is an installer issue because I was told the fan would run at slow speed most of the time, which is not the case.

    Thanks.

  8. #8
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,627
    Im betting on installer error and undersized duct work ,although im not there and they probably are oversized

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