Question about Heating & Cooling

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For ruud achiever 10 ac unit uaka-030jaz. Unit was working fine saturday...sunday we noticed air was not cold anymore. I have checked all my breakers, put a new battery in the thermostat, cleaned the filter on the furnace unit, and opened the exterior unit to see it the relay was burned( appears ok as long i understand which part is the relay.). When we turn on the ac the furnace unit in the attic will come on and blow air..however it never gets cold and nothing in the outside unit appears to come on at all. please help!

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  • tinscho Jul 20, 2010

    ok checked the disconnect...it does not have fuses..just the pullout style breaker...actually says no fuse inside on it...but i looked behind the cover to be sure and made all the connections were tight. Had the wife turn on the breaker inside again and the thermostat..no noises from the compressor or the fan at all. I did take a closer look at the contactor i believe it is...that has the power wires coming in to a largish plastic piece with brass screwes on top of a coil...and the center springloaded piece appears to have some scorch marks where it comes down to connect the 2 side of the unit with power. ( hope that describes it ok) ...could that be bad?

  • tinscho Jul 24, 2010

    thanks so much for timely answers and comments...I was eventually forced to call someone to come work on the unit. I knew it wasnt getting power for some reason but I'm no electrician and lack the tools to properly check it. The technician was able to diagnose the problem right away, my unit has a bad time delay switch out there next to the contactor which was not kicking the power on to the contactor. He was able to bypass it ( as i understand most digital thermostats have a built in time delay) and we were up and running again immediately. He then showed me some great tips on checking the line for proper coolant amounts and keeping the coil clean. All in all a good learning experience with help from you and the tech that came. Thank you again.

    tinscho

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  • Master
  • 1,515 Answers

Hi, the problem is in the outdoor unit if the indoor unit comes on and is blowing air. At the unit, you will have a disconnect box, 220 volts. Inside there will be 2- fuses. If you can't see them its because they are behind the plastic cover. You may have blown a fuse. This is where to start. Its best to replace both of them, as if 1 blew the other is close behind it. You say the outdoor unit is doing nothing, this is where the compressor and condenser fan is and if this unit is not running, you will have no cooling. So, find out why by checking for power to this condenser. If you replace the fuses and it starts, take a garden hose, kill the power and wash out the coil. Careful not to bend the aluminum fins with to much pressure. Turn power back on and let it cool. We have to find out why its off and this will be the place to start. Please keep me posted and we can go from there.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Posted on Jul 20, 2010

  • 3 more comments 
  • Robert Horton
    Robert Horton Jul 20, 2010

    Hi, I am surprised the box had no fuses, even with the pull out block, but it doesn't. Yes, what you are looking at is the contactor. This coil on the bottom is 24 volts and on a call from the thermostat it closes and sends high voltage through the contacts to start the unit. If the points are a little black, this is normal. What has to be determined is if you have high voltage to this contactor where the 2- hot lines come in. Now, if when your wife turns the a/c to cool, turn it way down to test, you should watch this contactor and if there is 24 volts going to the coil, it will close the contacts, you will see and here it. If this happens and the unit does not start, you have lost the high voltage that powers this outdoor unit. Re check breaker to make sure its set. High voltage at the box. What I am trying to say here is if you have no high voltage there, the thermostat should energize the contactor anyway, and close the contacts. If there is high voltage there when she does, it will energize and start. So, if you no for sure you have high votage to the contactor, and when the stat is set to cool and the contactor does not close, you have lost the 24 volts to the unit. This can be caused by this unit having a freon leak and its off on its low pressure switch. It may be your thermostat not making the R to Y contacts close. You can expose the wiring on the stat and take a jumper wire and touch across the terminals R to Y and it should come on. If it does, the stat is bad.Try that also. Just remember, you must have 24 volts from the stat to the outdoor unit to energize the contactor, and high voltage to run everything when the contactor closes. Check these things and get back to me please. I will wait to hear from you.
    Shastalaker7


  • Robert Horton
    Robert Horton Jul 20, 2010

    I just wanted to add, you have 2- high voltage breakers for a split system, one for the outdoor unit and one for the indoor. Check the out door as we know the blower is running.
    Shastalaker7
    PS, we will get it going.


  • Robert Horton
    Robert Horton Jul 20, 2010

    Hi, I don't know how far you are, but if you have no voltage meter, you can go to the outdoor unit also. This contactor that is scorched, you can use your finger or a insulated screw driver and push down on the spring loaded contacts. If there is power there, the unit will start. You are just closing it manually. This is the thermostats job, is to close this coil. We know you have power to the stat or the blower wouldn't work. So if you have high voltage to the out door unit, and the stat does not turn it on, more then likely, the cooling part of the stat is the fault. This is why I need you to jump across R to Y terminals, it will spark, but no danger to you and the outdoor unit should run. I don't believe you have lost your freon over night. Its just a simple voltage problem. I believe its the stat. We know you do have 24 volts to the stat, so if you turn it to cool and nothing at all happens to the contactor, the stat is the problem. Take your time, but let me know, I am here to help you.
    Shastalaker7


  • Robert Horton
    Robert Horton Jul 20, 2010

    Hi, just checking in on you. It is possible the contactor may be bad. If you have 24 volts to the 2- wires on each side of the coil with the thermostat calling for cooling, and you know you have high voltage at the contactor with nothing taking place, than yes, it would be the contactor. They do short out. But I have a feeling its the stat. If you had a cheap digital meter that read ac volts you would know real fast. If I were on site I could solve this for you fast, but I feel that you can also if you follow what I have said. Please keep me posted.
    Sincerely,
    Shastalaker7


  • Robert Horton
    Robert Horton Jul 25, 2010

    I am sorry you had to call someone out and that I was unable to get you there, but almost. Yes, I am very familar with the compressor time delay relay, and I have by passed many in emergencys. Thank you for the great rating and I am happy that he was a good and quick tech!!
    Shastalaker7


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