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  1. #14
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,775
    Quote Originally Posted by fbhero View Post
    I have a new(days old) unit 5 ton lennox with 3/4 inch line and after checking power consumption it is using exactly 25 % more power than my OLD 10seer unit, this unit is 15+seer.. so something is about to hit the fan
    So how many more BTUs is it removing then your old 10 SEER unit was?
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    How many times must one fix something before it is fixed?

  2. #15
    Join Date
    Sep 2002
    Posts
    13,549

    Ask your HVAC tech to prove it

    First ask to see the calculated refrigerant velocity for each size line and have him both calculate and measure the actual suction line pressure drop.

    Let's just start with - an undersized suction line, if it did anything; would tend to make your compressor work easier, not harder.

    PHM
    ------




    Quote Originally Posted by stempelman View Post
    Our HVAC tech was out and just noticed that the original installer used the wrong size suction line. The Lennox specs called for 1-1/8 inches and they used 3/4. This is for the HS26-060.

    Our tech said this would cause premature compressor failure (10 years instead of 15-20) and 30% higher energy usage on our AC bill.

    The original install was done 7 years ago so I believe any install warranty is long gone.

    The run is 30 feet and I am wondering if I should get the suction line replaced or if the damage has already been done - our tech said the compressor already sounds like it's been overworked.

    Please help!

    Thanks,

    Steve
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  3. #16
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Last edited by jpsmith1cm; 02-17-2013 at 10:57 PM. Reason: non AOP Member

  4. #17
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,928
    hvacty

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

    You can find the rules for posting and qualifications here.

    Additional infractions may result in loss of posting privileges.

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