Settings For Trane TAM7, XR16 and VisionPro IAQ with EIM
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  1. #1

    Settings For Trane TAM7, XR16 and VisionPro IAQ with EIM

    Hi,
    Thanks for great responses before installation, now I have some questions post-installation:

    The TAM7 has 2.5 ton coil XR16 HP is 2 ton. I was told AH settings were changed to a 2 ton, 800 CFM (400 CFM per tone, per installer). This is a replacement installation using existing ductwork.

    This is day 3 post-install, and I do not know how fast or whether anything is to "learned" by system or than Adaptive Recovery (which I choose to use even though not always recommended with HP).

    Some questions:

    1. The airflow is not fast enough to turn the air, so the warm air stagnates at about waist height, noticeably cooler below. The old system was probably too fast, but I need think a LITTLE more is needed. I believe that this is an adjustment?

    2. The proposal included that the airflow be adjusted by use of temp change across the coil for each stage (4h/2c), and adjust to mfg requirements. Is this still the way system CFM is adjusted? If not, how is it supposed to be correctly determined for the existing ductwork? What should I be asking for?

    3. I do not recall hearing a vacuum pump (or see one) being used to evacuate the system. Lineset is about 40 feet, about 15 across, the rest up. Is it possible that lineset was not evacuated since the compressor is supposed to have enough gas for 15 feet, and I saw that additional gas was added? Would that just affect efficiency, or would system simply not work. Right now, it is unusually warm for February in Atlanta, so I would not know if the system was inefficient.

    4. Visionpro IAQ was installed with Remote INDOOR sensor, and it appears wired in. However, Temp at thermo (using 3 thermostats) is consistently NOT averaging the two. Installer Settings show that it is set for Averaging (#340 Selection 2). I am showing, e.g., 67 on VisionPro, (Verified as 67) and 63 at Sensor (Verified as 63). I guess that Installer needs to test wiring, etc? No error codes, so I presume the sensor is being recognized.

    5. I wanted Outdoor sensor under the eaves away from the unit. Installer wanted to install it in the unit. Neither will be in direct sunlight. The Sensor Instructions do not mention anything about installing it in, or even near the unit (and especially not above the XR16). Is there a difference? For one, under the eaves is about 20 feet off the ground and is an open area.

    6. If I ran the VisionPro Testing Mode for the 4 stages of heat, without any error code being generated, may I presume that the system is functioning with 4 stages of hear?

    7. With IAQ and EIM, what controls the TAM7 ramp-up profiles? Are there options on the TAM7 board? I know that on cool, there is to be a dehumidifying ramp-up.

    8. The IAQ EIM was to be set to lower the fan speed slightly if the dehumification profile was on occasion inadequate. Is this best implemented through the IAQ Dehumidifier setting (which might affect ramp-up dehumidification) or should I use the separate Dehumifier control that I had on old system (close on rise) to manually cause the Fan Speed on cool to be lowered (presumably, by some fixed percentage).

    I know that these are some technical questions, and a number of them. I really appreciate everyone's input.

    THANKS!
    JBR

  2. #2
    Join Date
    Aug 2010
    Location
    West Monroe, LA
    Posts
    1,528
    In this case I will address the cfm setting for the unit. You need to call the installer back out and get them to check the settings on the dip switches!

    With the new tam7 air handlers their is a chart with install packet that will show them how to set up for the proper cfm needed. While this sounds easy what I have found on the new tam7 air handlers is you have to pay close attention to all the settings as the chart can be miss leading unless the installer understands how and why to choose the cfm settings.

    Also you have two chosses with the new Trane air handler torque mode or cont. cfm which will need to be slected by your dealer. They will have to set it up for the best results with your existing ductwork.

    As far as some of the other questions go I don't understand the 4 heat setting on the t-stat for heat with out knowing the kw aux heat pack size. More then lickly you have 8-10ke aux heat? With is staged but that would only require 3 heat/2 cool with your selection in less i am missing something?

    Again call and ask for the installing company to come back out and check all settings on the air handler and ask about the other problems you are concerned with as their are too many variables to give a precious answer for. Keep us posted on what they say!

  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by jbroberts38 View Post
    This is day 3 post-install, and I do not know how fast or whether anything is to "learned" by system or than Adaptive Recovery (which I choose to use even though not always recommended with HP).
    Adaptive recovery is always recommended with heat pumps, for maximum energy savings. With it on, the system will attempt to have the temperature at the set temperature by the programed time, and it will attempt to do it a little at a time using only the heat pump. It will take some time for it to "learn" how early it needs to start coming on.
    If it doesn't make it to the set temperature on time, the electric aux heat will kick in to bring the house up to temperature.
    Some people don't like the heat coming on before the set time though, so for them I turn it off.
    Without the recovery feature on, the system will wait until the set time, then bring on all stages of heat to bring it up to temperature.
    1. The airflow is not fast enough to turn the air, so the warm air stagnates at about waist height, noticeably cooler below. The old system was probably too fast, but I need think a LITTLE more is needed. I believe that this is an adjustment?
    The airflow can be adjusted, but register types and throws should also be looked into.

    3. I do not recall hearing a vacuum pump (or see one) being used to evacuate the system. Lineset is about 40 feet, about 15 across, the rest up. Is it possible that lineset was not evacuated since the compressor is supposed to have enough gas for 15 feet, and I saw that additional gas was added? Would that just affect efficiency, or would system simply not work. Right now, it is unusually warm for February in Atlanta, so I would not know if the system was inefficient.
    If no evacuation was performed, the system won't ever work at full capacity/efficiency, and the compressor will likely have a shortened life span.
    Most vacuum pumps are not particularly loud, so it could have been used without being noticeable from inside the house.

    5. I wanted Outdoor sensor under the eaves away from the unit. Installer wanted to install it in the unit. Neither will be in direct sunlight. The Sensor Instructions do not mention anything about installing it in, or even near the unit (and especially not above the XR16). Is there a difference? For one, under the eaves is about 20 feet off the ground and is an open area.
    In the unit is easy, as the wires are typically already there. Running it to the eaves requires extra wiring.

    6. If I ran the VisionPro Testing Mode for the 4 stages of heat, without any error code being generated, may I presume that the system is functioning with 4 stages of hear?
    The thermostat only knows it sent the signal for each heating stage, there is no feedback to tell the thermostat that anything actually happened.

    7. With IAQ and EIM, what controls the TAM7 ramp-up profiles? Are there options on the TAM7 board? I know that on cool, there is to be a dehumidifying ramp-up.
    The controls in the air handler control the blower profile.

    8. The IAQ EIM was to be set to lower the fan speed slightly if the dehumification profile was on occasion inadequate. Is this best implemented through the IAQ Dehumidifier setting (which might affect ramp-up dehumidification) or should I use the separate Dehumifier control that I had on old system (close on rise) to manually cause the Fan Speed on cool to be lowered (presumably, by some fixed percentage).
    Use the demand dehumidification on the IAQ, it does the same thing the separate control on your old system did, and doesn't interfere with the normal ramping profile of the blower, other than reducing the final blower speed.[/QUOTE]
    If more government is the answer, then it's a really stupid question.

  4. #4
    You two are great. In my profession, I can read the tax code without falling asleep.
    I had started reading the AH manuals, saw the torque vs. flat CFM discussion, couldn't figure it out--and realized I had dozed off!

    I am going to wait for the inspector to come out Tuesday, then call the installer. I hope they have a "geek" that they can send out.

    Duckman, as for the 4 heat stages, the XR16 has two stages HP, then the 10kw (nominal) unit is to have two stages of 5kw and 5kw. Since the VisionPro Test doesn't show an error code, Mr. Beiser notes that the VisionPro only shows that the signal was sent, not whether the strips powered up (and since I was taking a while, I did not stick around to see whether the AUX light came on).

    I am going to pick up a DATS to confirm that the staging is occurring. For the minor cost on A***, I don't have to run up to the attic to confirm the temps.

    I will get back if there are more questions.
    JBR

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