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Thread: Replacing A/C

  1. #14
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    10,551
    Post Likes
    Should run constantly when it gets to design temperature. I’m showing summer design temp at 95*F at Trenton and Newark. Your unit should run constantly at that temp.
    Sounds like the original installer and the new contractors are using rules of thumb. Which are wrong.
    “I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison

    “It’s not whether you get knocked down, it’s whether you get up.” - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486

  2. #15
    Join Date
    May 2019
    Posts
    15
    Post Likes
    Thread Starter
    Assuming a 2.5 ton is the correct size -with the 2 quotes listed below with the duct work.... comments on the duct work is appreciated. Thanks!

    1st - Rheem Condensing Unit Model RA1324AJ1NA
    Rheem Air Handler Model RH1O2417STNJA

    Installation Shall Include:
    Remove and junk old Air Handler and Secondary Drain Pan
    Install new Air Handler on top of new Drain Pan
    Install new Metal Truck Line and Flex Ducts
    Construct new plenum and connect to Duct Work and Air Handler
    Construct new Return Box and connect to Air Handler
    Run Return Flex Duct and connect to box
    Remove and junk existing Refrigerant Line Refrigerant Lines
    Run new Refrigerant and Drain Lines and connect to Air Handler
    Run Refrigerant and Drain Lines down exterior of house encased in Slim Duct
    Remove and junk old Condensing Unit
    Place Condensing Unit on level pad
    Connect Refrigerant Lines Condensing Unit
    Install new thermostat
    Wire System
    Vacuum System
    Complete start-up and check of system

    Rheem Factory Warranty:
    Ten (10) years on parts IF registered on line OR Five (5) years if not registered
    One (1) year on labor

    Rheem warranty must be registered on line at www.registermyunit.com
    Thermostat is warranted for five years

    2nd quote
    Remove and dispose of existing Air conditioner and Air handler.
    Remove existing refridgerant line set.
    Supply and install Armstrong 16 seer 2.5 ton air
    conditioner and Armstrong 2.5 ton air handler with PSC motor.
    Supply and install new refridgerant line set. All existing ductwork to remain. System comes with new Honeywell T4 Pro Thermostat.
    System comes with 10 yr parts and 5 year labor warranty

    Remove all existing fiberglass supply ductwork. remove all flexible branch duct work.
    Supply and install new sheetmetal supply ductwork and plunum.
    Supply and install new r8 flex branch supplies to each register. Insulate all ductwork with r8 foil wrap. Note:
    All ceiling registers to be reused.

  3. #16
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    20,893
    Post Likes
    Quote Originally Posted by Sam7552 View Post
    Assuming a 2.5 ton is the correct size -with the 2 quotes listed below with the duct work.... comments on the duct work is appreciated. Thanks!

    1st - Rheem Condensing Unit Model RA1324AJ1NA
    Rheem Air Handler Model RH1O2417STNJA

    Installation Shall Include:
    Remove and junk old Air Handler and Secondary Drain Pan
    Install new Air Handler on top of new Drain Pan
    Install new Metal Truck Line and Flex Ducts
    Construct new plenum and connect to Duct Work and Air Handler
    Construct new Return Box and connect to Air Handler
    Run Return Flex Duct and connect to box
    Remove and junk existing Refrigerant Line Refrigerant Lines
    Run new Refrigerant and Drain Lines and connect to Air Handler
    Run Refrigerant and Drain Lines down exterior of house encased in Slim Duct
    Remove and junk old Condensing Unit
    Place Condensing Unit on level pad
    Connect Refrigerant Lines Condensing Unit
    Install new thermostat
    Wire System
    Vacuum System
    Complete start-up and check of system

    Rheem Factory Warranty:
    Ten (10) years on parts IF registered on line OR Five (5) years if not registered
    One (1) year on labor

    Rheem warranty must be registered on line at www.registermyunit.com
    Thermostat is warranted for five years

    2nd quote
    Remove and dispose of existing Air conditioner and Air handler.
    Remove existing refridgerant line set.
    Supply and install Armstrong 16 seer 2.5 ton air
    conditioner and Armstrong 2.5 ton air handler with PSC motor.
    Supply and install new refridgerant line set. All existing ductwork to remain. System comes with new Honeywell T4 Pro Thermostat.
    System comes with 10 yr parts and 5 year labor warranty

    Remove all existing fiberglass supply ductwork. remove all flexible branch duct work.
    Supply and install new sheetmetal supply ductwork and plunum.
    Supply and install new r8 flex branch supplies to each register. Insulate all ductwork with r8 foil wrap. Note:
    All ceiling registers to be reused.
    Your units probably oversized on undersized duct work like 75% of the tract home systems out there.

    Get it sized properly
    have the ducts checked if they'll handle the required air flow
    choose the contractor over the name on the box's

    You know what ASSUME stands for!

  4. #17
    Join Date
    May 2019
    Posts
    15
    Post Likes
    Thread Starter
    perhaps I didnt remember right...I beleive it did run alot when it was hot outside....it kept the house comfortable ..it was a good unit Heil 30yrs old

  5. #18
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    20,893
    Post Likes
    The only way to know what size is needed is to have a Manual "J" heat Load/Loss calculation performed.
    not what was there
    not X amount of years doing this
    not we know

    Once you KNOW what size is needed then the ducts need to be checked too see if there correct

  6. #19
    Join Date
    May 2019
    Posts
    15
    Post Likes
    Thread Starter
    Any recommendations on who performs the Manual "J" heat load/loss calc in north NJ? Of the 3 quotes not one did the calc. Hearing the usual been doing this for many
    years.

  7. #20
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    20,893
    Post Likes
    Quote Originally Posted by Sam7552 View Post
    Any recommendations on who performs the Manual "J" heat load/loss calc in north NJ? Of the 3 quotes not one did the calc. Hearing the usual been doing this for many
    years.

    Unfortunately its not worth the labor in most residences. 4 - 8 hrs spent with possibly no return on time spent!

    If you can use a ruler you can get one done on line.

  8. #21
    Join Date
    Jan 2014
    Location
    New England
    Posts
    4,996
    Post Likes
    Geez, for a minimal amount of effort and cost they should install a new OD disconnect switch and whip ( sealtite from disconnect to OD unit ) also at 30 years old why not replace the existing ( probably oversized amprege wise ) breaker/fuses with a matched between the minimum/maximum size that the manufacturer recommends located on the OD unit electrical data plate. If they plan on replacing OD disconnect and whip they should specify that in the contract. Nothing like a new system and a new breaker IMO. New units are so much more energy efficient ( use less amprege ) than those old dinosaurs. Another minimal cost item for the Contractor. Nothing pops more than all new materials by the OD unit.

    Worst case if the electrical data plate at the existing OD unit is visible take a picture of those amprege draws then compare to the new unit. Same with the ID section. May even state the HP sizes also.

    If your existing unit still runs have them check the amprege draw of the compressor, OD and ID fan motors, then replace system and check those three points again to get a general idea in % of the less amprege draw at similar OD temperatures.
    Last edited by Bazooka Joey; 05-18-2019 at 08:54 AM.

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