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Thread: high head?..

  1. #1
    Join Date
    Feb 2004
    Location
    southern illinois
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    5,522
    did a start-up today on furn' chg. out i did a couple months ago...it was 78 out,71 in,i had 300 psi head on this unit....i thought it was kind of high..would a condenser motor that had been changed out have something to do with this..22 super heat and delta t of 20 though?

  2. #2
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
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    607
    Condenser motor change. Absolutely, I'll bet the condenser air discharge was unusally hat also.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,095
    Its possible, check if its the right rotation.

    Is there any chance you put a kink in the line while changing the furnace.

    What was the suction pressue.
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  4. #4
    Join Date
    Feb 2004
    Location
    southern illinois
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    67-68psi..discharge temp was 122, liq. line temp of 115...

  5. #5
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,002
    You never opened up the system? if you did not the system probably has been running these pressures before you touched it. What was the suction? if it was normal, the condenser may need a good bath, or check temp. on each side of the liquid drier. Just some thoughts.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  6. #6
    Join Date
    Feb 2004
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    southern illinois
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    condenser was not plugged or anything....

  7. #7
    Join Date
    Jul 2004
    Location
    West TN
    Posts
    983
    Guess its that time of year again to dust off the old
    air conditioning brain cells.

    http://www.hvac-talk.com/vbb/showthr...threadid=55974
    Extend to others the grace that God has given you.

  8. #8
    Join Date
    Feb 2004
    Location
    southern illinois
    Posts
    5,522
    no dryer,no kinks,and i recovered refrig. took out coil cleaned it and pulled vacum recharge new refrig....by the way this is cap-tube coil..

  9. #9
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,002
    Originally posted by mo-flo
    by the way this is cap-tube coil..
    O I hate it when that happens

    Any cap tubes freezing up? what was the suction pressure?
    and the furnace is geared for the right amount of cfm's for the evap. coil? was it very humid inside the house when you started the system? this can cause a higher than normal head until some of the humidity is removed.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  10. #10
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    you sure you didnt over charge the system
    some of the old cap tube coils ran low back arround 55 to 60. if the blower is not putting out enough cfms it will be lower. very easy to over charge a cap tube since we are used to today coils with 70 to 90 lb back

  11. #11
    Join Date
    Apr 2005
    Location
    Ms.
    Posts
    3
    clean the od coil. picking up heat may not be getting rid of it.

  12. #12
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,002
    Originally posted by mo-flo
    condenser was not plugged or anything....
    I have run across them that looked pretty from the outside then I got out the water hose and it looked like a mud slide on the slab.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  13. #13
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,002
    Originally posted by tinknocker service tech
    some of the old cap tube coils ran low back arround 55 to 60.
    This is true! Tin, we are telling our age.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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