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Thread: New line set??

  1. #1
    Join Date
    Sep 2005
    Posts
    2
    Having a new system installed Infinity calls for a 1 1/8" lineset, old unit (30 years) had a 1 1/8" line. It is hard pipe is it fine to leave it but have the line purged?

  2. #2
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    6,058
    Are you replacing with r22 or r410A?

    What is the tonnage of old unit? How big is new unit?

    For thirty years that size line set would have to be a commercial application.

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
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    18,836
    I'd reuse it if it's the correct size,unless it's very easily replaced.If the old system didn't have a burnout,purge with nitrogen,if it did "Rx Flush" to clean the line set.

  4. #4
    Join Date
    Sep 2005
    Posts
    2
    Old unit was a Carrier 4T, new unit is Carrier Infinity 5T so that is Puron or 410a. I do believe the unit may have been a commercial unit in a residential application. I trust the HVAC contractor knows what he is doing but I am just an perfectionist. thanks

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Going from a 4 ton to a 5 ton systems ,often requires modifications to the old duct system,for the added air flow.

    Might want to ask them to test the ESP(External Static Pressure),it's the resistance of the ducts to air flow.

  6. #6
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793

    smaller lines

    may cost you some SEER rating (maybe .5) but more important is to know what % silver braze was used on the old and be sure to flush them chemically

  7. #7
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    A current five ton unit would require a one and an eigth inch suction line.

    Thirty years old? I am having serious doubts about whether the size you posted is accurate.

    Seven eighths would be more in line with a four ton of that era.

    How big is the liquid line?

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