Results 1 to 5 of 5
  1. #1

    Having problems Input please...

    I just recently moved to Miami from West Palm Beach because my girlfriend is attending the university of miami school of law. Well that all being said i still live in west palm beach because i work for an air conditioning company. Im not a service technician but i work in the office... Unfortunately the air conditioning company that i work for does not go down this far. So my landlord had an A/C guy come to the house and check it out. These are my issues.

    I live in a 2 story duplex on the 2nd floor the house was built in the 40's i have noticed that the attic has no insulation whats so ever!!! My squarefootage is 700 and theres a 5 year old 2Ton Rheem in here. After the A/C guy left here this is the information he gave me.

    Outlet 68 degree's
    Inleft to A/H 83 degree's
    81 at the Tstat but set to 77degrees
    Anbient tempature 92 degrees

    Pressures 85low, 254high.

    Iv never heard of this but.
    54
    -71
    = 19 degree superchoat.

    He says that A/C is running to manufacture specs. And doesnt the TD seem a little low? Also we are having an insulation company blow R30 this thursday. Maybe the heat low is high during the day because there is no insulation. I dunno thats why im turning to you guys for your help. The A/C runs all day during the day and will only keep the tempature till about 11am then it goes up in the afternoon. Then finally at 1am in the morning it will turn off when it goes to 76degrees and operate normally.

  2. #2
    Join Date
    Sep 2002
    Location
    I don't know
    Posts
    2,903
    Temperature drop in itself can not be used to determine if a system is running at capacity.

    High indoor humidity can reduce the temp drop; wetbulb return/supply temperatures and airflow measurements are required to calculate system capacity.

    The blower speed might be too high.

    Iv never heard of this but.
    54
    -71
    = 19 degree superchoat.
    If you meant superheat, 19 might be a little high at 83F if it's dry; I can't tell without the wetbulb return air temp. The other numbers look okay.

    Edit: I assumed that the metering device is fixed; if it's a TXV you could have a major problem.

    Also we are having an insulation company blow R30 this thursday.
    That will make a huge difference.

    The A/C runs all day during the day and will only keep the tempature till about 11am then it goes up in the afternoon. Then finally at 1am in the morning it will turn off when it goes to 76degrees and operate normally.
    For the record, running continuously for several hours is normal during hot weather.
    General public's attitude towards our energy predicament: "I reject the reality of finite resource depletion and substitute it with my own; energy is infinite, we just need an alternative storage medium to run the cars on. The economy can grow indefinitely - we just need to "green" everything! Technology is energy! Peak what?"

  3. #3
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,888

    Arrow It could be a number of things - get Subcooling

    Quote Originally Posted by omoeseso View Post
    Clipped...
    So my landlord had an A/C guy come to the house and check it out. These are my issues.

    I live in a 2 story duplex on the 2nd floor the house was built in the 40's i have noticed that the attic has no insulation whats so ever!

    My squarefootage is 700 and theres a 5 year old 2Ton Rheem in here. After the A/C guy left here this is the information he gave me.

    Five years old, appears to be a 10-SEER?

    Outlet 68 degree's
    Inleft to A/H 83 degree's 15-F indoor temp-split
    81 at the Tstat but set to 77degrees
    Anbient tempature 92 degrees

    Pressures 85-psig suction.
    254-psig head 119-F Condensing Temp minus 92-F outdoor temp= 27-F Temp-rise. A bit high for a 10 or 12-seer, but could be okay depending on indoor humidity level.

    I never heard of this but.
    54 -71= 17-F degrees superheat.
    -------------
    Suction 85-psig is 51-F SST SLT 71 = 20-F Superheat.
    High for 92-F outdoor temp.

    Is unit & both SA & RA in the attic; not well enough insulated.
    Blower CFM too high?

    Could be drawing hot attic air into Return-Air.

    Could be a little low on charge when heatload is higher, starving E-Coil.

    Liquid-line Subcooling would reveal that, but NO liquid-line temp taken!


    He says that A/C is running to manufacture specs. And doesnt the TD seem a little low? (See above items that need checking.)

    Also we are having an insulation company blow R30 this thursday. Maybe the heat load is high during the day because there is no insulation. I dunno thats why I'm turning to you guys for your help. The A/C runs all day during the day and will only keep the tempature till about 11am then it goes up in the afternoon. Then finally at 1am in the morning it will turn off when it goes to 76degrees and operate normally.
    The insulation will help a lot, but seal everywhere possible to reduce air infiltration, but only to safe levels. - Darrell
    Last edited by udarrell; 08-09-2009 at 12:40 PM. Reason: Appears to be 10-seer?

  4. #4
    The A/H is vertical in a closet. A few days after we moved in i noticed the crappy filter they in the unit was really dirty. I ordered from work antimicrobial sponge filter. The evap coil was a little dirty so i brushed some of the debris away.

    Im not sure what seer the system is but maybe u will know by the model and serial numbers

    Model #14AJ06501C01 OR RCBA2457G
    SERIAL # M520500409

    Like i said at night time it seems to work fine. But during the day it just runs and runs and runs and doesnt keep temp... I dont know maybe the fan speed is just set real high. If i need to adjust witch wires on the fan switch do i need to change around?

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,750
    Put a regular blue fiberglass air filter in.
    And see if that makes a difference.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event