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  1. #1
    Join Date
    Jul 2006
    Posts
    3
    I had an a/c condensor installed and during the install
    the installer told me to turn on a/c in the house.
    As I turned a/c on the installer ran into my house to
    tell me to stop and NOT turn a/c on, but it was too late
    furnace blower had already started up so I know it signaled
    the a/c condensor to start. I immediately turned off a/c
    at the thermostat and went outside. The installer had just
    got done pulling a vacuum and had forgot the open the service valves prior to telling me to turn on a/c at the
    thermostat. Installer said the a/c condensor never kicked in because it was on a delay
    but I tried it for myself after he left and found the condensor starts about 1 second before the furnace blower
    motor kicks in so I'm pretty sure the a/c condensor DID
    startup even though he said it didn't. The condensor is
    a 13 seer Carrier scroll compressor with high and low
    pressure switches. Is it possible the pressure switches
    prevented the compressor starting up, or is there a chance
    the compressor was damaged by this startup with the service
    valves closed? The compressor probably only ran for a
    few seconds if it did start up, would this be long enough
    to damage the compressor?
    After opening the service valves he told me again to go
    turn on the a/c and when I did it started up fine, and seemed OK, but I noticed him looking alot down into the
    top of the condensor unit. After he left I looked down
    into the condensor to see what he was looking at and noticed
    some oil in the bottom of the unit, I think I noticed some
    oil in the bottom when I was checking it out when he first
    set it in place before we ran the a/c because it looked
    like the paint in the bottom of the condensor had runs in
    it but on closer inspection later I found it was oil and
    NOT paint runs. Do scroll compressors have a relief valve
    that would give off oil if compressor is started with
    service valves closed? Would a few seconds of running
    with service valves closed damage compressor? I later
    sprayed out the bottom of unit with water to rinse out the little bit of oil in the bottom and to see if more oil returned when I ran the condensor some more. No more
    oil showed up and unit seems to run fine, but I need
    to know if unit was damaged by earlier startup with
    valves closed. Could oil in the bottom possibly be
    there from spillage during manufacture or installer unhooking freon line with freon valve still open.
    Any opinions welcomed. Should I call Carrier to see
    what they say? Thanks in advance, Jack

  2. #2
    Join Date
    Feb 2004
    Posts
    2,597
    why did he have to come inside to turn it off. he could have pulled the disconnect.

  3. #3
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    Originally posted by billva
    why did he have to come inside to turn it off. he could have pulled the disconnect.
    Probably no disconnect...

  4. #4
    Join Date
    Jul 2006
    Posts
    3
    Why he didn't pull the disconnect I don't know, it's mounted
    on the wall next to the a/c condensor. He had pulled it
    before when he was wiring up the condensor. I guess he
    though he could stop me from turning in on in the first
    place. Not really sure why he did't just pull disconnect.
    Jack

  5. #5
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,846
    Originally posted by BSCHVAC
    Originally posted by billva
    why did he have to come inside to turn it off. he could have pulled the disconnect.
    Probably no disconnect...
    What no low voltage wire also to cut or pull?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  6. #6
    Join Date
    Dec 2005
    Location
    Cleveland, OH
    Posts
    2,137
    A few seconds of running with the service valves closed likely did not do any damage. I run into this a lot in new construction - the electricians install disconnects and leave them on, and the customer runs them even if we haven't done a startup.

    I had one run 12 hours with the service valves closed, after fixing the lines and letting it sit, it started right back up. I also had one run 8 hours like this, it sounded like someone pouring gravel into a coffee grinder.

    A few seconds should be no problem. Don't worry about it. I wouldn't worry about oil in the base pan on a new unit - this could just be from the manufacturing process.

    Good? Bad? I'm the guy with the gun.

  7. #7
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,707
    if unit has low pressure switch there is no way running unit would damage it. it would do the same thing as pumping the unit down this is a procedure we do all the time. as said before oil is probably from manufacturing. if charge was ok when unit was started up i would not worry about it.

  8. #8
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    Originally posted by mx5ed
    I
    Installer said the a/c condensor never kicked in because it was on a delay
    but I tried it for myself after he left and found the condensor starts about 1 second before the furnace blower
    motor kicks in so I'm pretty sure the a/c condensor DID
    startup even though he said it didn't.

    It might have a time delay in the t-stat or unit for x amount of minutes after a power outage. You don't sound very trusting of your installer....someone off the street corner or a friend of a friend of a second cousin?
    If everything was always done "by the book"....the book would never change.

  9. #9
    Join Date
    Jul 2006
    Posts
    3
    Thanks for the replies. Condensor ran fine all day today.
    After reading the replies it sounds like the compressor
    probably will be OK. That's a relief.

    Thanks, Jack

  10. #10
    Originally posted by mx5ed
    The condensor is
    a 13 seer Carrier scroll compressor with high and low
    pressure switches. Is it possible the pressure switches
    prevented the compressor starting up, or is there a chance
    the compressor was damaged by this startup with the service
    valves closed? The compressor probably only ran for a
    few seconds if it did start up, would this be long enough
    to damage the compressor?
    The low pressure switch would have cut out right away. A few seconds shouldn't break anything anyways.

    BTW, my Goodman condensing unit had some oil in the bottom when it was new. I think it's to protect the condenser from corrosion during shipping. I'm not sure what type of oil it is, but it does not harm landscaping. Don't worry about it.

  11. #11
    Join Date
    May 2003
    Location
    Dixie
    Posts
    1,344
    don't worry..be happy

  12. #12
    Should not be a problem. Even air conditioner pump down is carried out by closing the liquid line service valve.

    It's a relief isn't? All the best

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