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  1. #1
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    Three-and-a-half ton system with 80% furnace

    Did this for a real estate friend of mine who got me a sweet deal on my house so I took care of him gave him a very reduced labor price on this. His existing furnace could only move two tons. After counting all his registers put his blower on high speed and there was probably pushing anything through the Ducks I know I could put at least 1ton more air through the system. If I was 200 CFM short on a 3 and 1/2 ton unit I knew it wouldn't be a big deal it would not ice up. I've worked on those type of systems before. You can move 1 ton more air than the unit is sized four still get a good TD many times.

    Sent from my SM-J700T using Tapatalk

  2. #2
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    Are you serious?
    “Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.”

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  4. #3
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    you really should stop posting on the Wall of Pride.

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  6. #4
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    Thread Starter
    Another super tight fit job and got the house cooling great. I offset the coil. Works excellent.

    Sent from my SM-J700T using Tapatalk

  7. #5
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    Were you wearing a blindfold when you did the job?
    “Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery.”

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  9. #6
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    I don't see anything wrong with this job. The piping is tight nice out of the way. I wasn't going to replace the existing flue B vent is a little old but I'm not going to change all that out. Don't need to and the customer my real estate guy kind of cried about every little Penny had to spend so I had a little bit of pressure on me to keep the cost down. It was a tight fit I had an offset that coil which works just fine I don't really see anything that's wrong with it and it works awesome. From the top of the return box to the supply duct I had about 4in to spare

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  10. #7
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    Mar 2013
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    Parts of that coil are getting no air. BOO HOO if the agent is crying about money. You're on a race to the lowest level of quality. You're doing a huge disservice to the future owners.

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  12. #8
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    Thread Starter
    Quote Originally Posted by HVAC_Marc View Post
    Parts of that coil are getting no air. BOO HOO if the agent is crying about money. You're on a race to the lowest level of quality. You're doing a huge disservice to the future owners.
    Not at all you're completely wrong. The offset is 2 in which I did not have with the return duct. The unit has a very good temperature drop has never Frozen up. I'm sure you think you have to have exactly 1400 CFM for 3 & a half ton machine. That's not always the case I've done installs where I've actually slowed the fan down some and sped it up some. That machine there I have 4 tons of air going through it. And when I counted up all the registers and saw how that place was installed and saw how weak the airflow was from the existing 2-ton system they had no AC on it but it was rated up to 800 CFM I knew it I could push plenty of air in there it was a 2000 square foot house

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  13. #9
    Join Date
    Mar 2015
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    Quote Originally Posted by thekux View Post
    Not at all you're completely wrong. The offset is 2 in which I did not have with the return duct. The unit has a very good temperature drop has never Frozen up. I'm sure you think you have to have exactly 1400 CFM for 3 & a half ton machine. That's not always the case I've done installs where I've actually slowed the fan down some and sped it up some. That machine there I have 4 tons of air going through it. And when I counted up all the registers and saw how that place was installed and saw how weak the airflow was from the existing 2-ton system they had no AC on it but it was rated up to 800 CFM I knew it I could push plenty of air in there it was a 2000 square foot house

    Sent from my SM-J700T using Tapatalk
    "Counting Registers"?????

    Please direct as to which Manual that is found in Sir.

    Did You actually measure the SA & RA Duct work?
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

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  15. #10
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    The coil is 21 in wide the furnace is 17. I didn't want to put a bigger BTU furnace in there then was already in there. So it's naturally offset by 2in you move it over completely on one side it doesn't make a bit of difference

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  16. #11
    Join Date
    Mar 2015
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    Quote Originally Posted by thekux View Post
    The coil is 21 in wide the furnace is 17. I didn't want to put a bigger BTU furnace in there then was already in there. So it's naturally offset by 2in you move it over completely on one side it doesn't make a bit of difference

    Sent from my SM-J700T using Tapatalk
    Do You understand what a "Transition", in relation to Sheet-metal is?
    Hos 4:6 My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you, that you may be no priest to me. Because you have forgotten your God’s law, I will also forget your children.


    "You've got to Stand for Something or You'll fall for anything" (A. Tippin)


    Mat_15:24 But he answered, “I wasn’t sent to anyone but the lost sheep of the house of Israel.”

  17. #12
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    Aug 2008
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    Hibbing, MN
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    Fit and finish is poor. Flue pipe is not plumb. Flex gas line in not professional. You could take a little more time and make it look better without spending more money. Also, your method of system sizing is somewhat unconventional. Normally we do a heat load calc and go from there.
    If God didn't want us to eat animals... He wouldn't have made them out of MEAT.

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  19. #13
    Join Date
    Mar 2013
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    You can argue it all you want. what you did is wrong and you posted it in a picture. the coil extends past the drains. that area is well beyond the opening in the furnace and it hangs off the edge. i'd bet that section frosts and freezes.

    you cant size a system counting registers and feeling air flow. Ratings dont mean diddly when it comes to reality. you habve no data according to your posts. you're guessing and patting yourself on the back.

    please, dont assume what i think or dont think. Even my hack jobs dont meet this level of "stunodicy". yes, I made that up. I hope Timebuilder forgives me.

  20. Likes kdean1 liked this post
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