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  1. #14
    Join Date
    Feb 2008
    Location
    Dallas & Longview, TX
    Posts
    629
    I thought it sounded like the condensation was after the drain, in the supply plenum.

    As stated high static can lower cfm's to create the moisture/water out of the ducting close to the plenum.

    Another thing to have the contractor check is the p-trap if the evap. coil is on the negative side of the blower. May be no trap or open clean out uphill of the trap.

  2. #15
    Join Date
    Jul 2009
    Location
    Florida
    Posts
    9

    Confused Vent, register, duct size information

    Three branchs come out the main trunk. The first one is 9 inch (master bedroom 7 inch, master closet 4 inch, and master bathroom 5 inch), the second one is 8 inch (bedroom #1 5 inch, bedroom #2 6 inch, hallway bath 4 inch), and the third one is 12 inch (kitchen 6 inch, living room 7 inch, and family room 7 inch). Detail for duct size, vent size, and register in the attachment. All distributer boxes are very small.

    Thank you for all your helps.
    Attached Images Attached Images  

  3. #16
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    From the duct sizes,sounds like they are too small.

    If the rest are undersized,then that could be your issue.

  4. #17
    Join Date
    Jul 2009
    Location
    Florida
    Posts
    9

    Confused Duct size, register, and vent

    How do you calculate the duct size per each register? If duct size are 7, 5, 6, and 4 inch what register size can use with it. What happen if the register size smaller than duct size? For example, the duct size is 7 inch and register is 4 inch what is the CFM do you get out of it? My installer/dealer said they cannot change the register box because it connect to the house frame. Is this correct?

  5. #18
    Join Date
    Jul 2009
    Location
    Florida
    Posts
    9

    Thumbs down How to find the trusted dealer?

    Does anyone know how to find the trusted dealer these days? I look on bbb.org, angelist.com, company with long service, and state license but still cannot find the right dealer. What is the secret to find the right answer? I don't know anything about air conditioning therefore I can't tell what is really trusted answer.

  6. #19
    Join Date
    Jul 2009
    Location
    Alabama
    Posts
    63
    If I'm reading you right based on .08 static for the main supply duct you have around 1075 cfms or 2.5 tons based on 400 cfms per ton. The supply branches only add up to around 865 cfms or 2 tons based on 400 cfms per ton/865 cfms. This is grossly undersized for a 4 ton system/1600 cfms.
    Yes register boxes can be replaced unless the structure prevents access to them.
    I bet the return is just as bad. As already stated you need a load calculation to figure the proper size system for you home and duct designed to the size unit you need.
    The thermostat should not be near any supply registers preferably in a location close to the return. If you have one return it should be located as close to the center of the home if possible.

  7. #20
    Join Date
    Jul 2009
    Location
    Florida
    Posts
    9

    Confused How the results?

    DLR - Could you give me the fomular of how to calculator to get the result? Can 9 inch duct go with 6 inch diameter register and 18x10 vent?

  8. #21
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,148
    Quote Originally Posted by motoguy128 View Post
    Assuming the main trunk is sized adequately and you have enough return... a 4" duct can handle around 60CFM, a 5" 90CFM and a 6" about 150CFM. So with that in mind, the most airflow your supply branches can handle is about 1020... or as you mentioned, abotu 2.5 Tons of airflow. Even with that, you'll have some noisy vents. So shoving 1600CFM throught there is not adviseable. I'd guess the static is so high, it's unliekly the unit is even reaching 1600CFM. SO that might also be why you're getting so much condensation.

    I wouldn't be suprised is a load calculation says you only need a 2.5 ton system... so a 3 ton 2 stage unit might have been OK.


    Have the contractor come back and first fix the drain issue at minimum.

    Beyond that...well good luck.
    Are you a mechanical engineer?
    Perhaps you should have read the instructions before calling.

  9. #22
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by jrbenny View Post
    Are you a mechanical engineer?
    How are the house ticket sales going??

  10. #23
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Just got an email from them,two days left,come on guys $50 and you could win a house,good cause,and the winner can't go wrong.

  11. #24
    Join Date
    Jun 2009
    Location
    Jesup GA.
    Posts
    83

    Hmm air hander sweating !!!!

    Quote Originally Posted by uname2000 View Post


    I just got installed the new Trane XL16i 4 tons about 6 days ago. Following are the problems that I am having:

    1. Excessive moisture outside air-handle
    2. constant cooling cycle even already change option 220 and 230 from the thermostast TCONT900AC43UA
    3. The dealer update system from 3 ton to 4 ton without do air balancing
    4. The vent direct hit the thermostat made the system shutdown fast


    The most concern is why too much moisture developing outside the air-handle?

    Does anyone have experience on Trane 4TEE3C07A1000A (air handle), 4TTX6 (outside unit), and TCONT900AC43UA (thermostat)?

    How do I measure the CFM at the register? The dealer said it should be right but the register was designed for 2.5 tons when the house had not modified.

    There are 4 settings for Airflow Performance on air-handler (290 CFM, 350 CFM, 400 CFM, and 450 CFM). The current setting is 400 CFM for 4 tons. If change it to 350 CFM is it means the system will run as 3.5 tons and 290 CFM is 2.9 tons. Will the cycle is going to be longer if decreasing the CFM?

    Thank you,
    You may have a air flow problem! if the duct was size fir a 2/5 ton unit.If you lower the fan speed all this will do is lower sencable heat cap. and raise the latent cap. The compressor needs to have a lower cap. 2 stage or two compressors for low ambeint temp. Yue duct work probley needs up grading to handle the units cap. hope this helps.

  12. #25
    Join Date
    Jun 2009
    Location
    Jesup GA.
    Posts
    83

    I AGREE

    Quote Originally Posted by DLR View Post
    If I'm reading you right based on .08 static for the main supply duct you have around 1075 cfms or 2.5 tons based on 400 cfms per ton. The supply branches only add up to around 865 cfms or 2 tons based on 400 cfms per ton/865 cfms. This is grossly undersized for a 4 ton system/1600 cfms.
    Yes register boxes can be replaced unless the structure prevents access to them.
    I bet the return is just as bad. As already stated you need a load calculation to figure the proper size system for you home and duct designed to the size unit you need.
    The thermostat should not be near any supply registers preferably in a location close to the return. If you have one return it should be located as close to the center of the home if possible.
    Manual J first then Manual D and then manual s (for unit) and findly manual T for regesters Works GREAT. You will be very happly. Good luck!
    ste

  13. #26
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,148
    Quote Originally Posted by dash View Post
    How are the house ticket sales going??
    They are real close to 5000. I think they are going to hit it, but it will be close. They can use all the help they can get.
    Perhaps you should have read the instructions before calling.

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