York DH150N15Q2BMA3D
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  1. #1
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248

    York DH150N15Q2BMA3D

    This system keeps going out on high head pressure for both circuits (400psig). Both condenser fans are running, and both coils are clean. When I spray a hose with water on the condenser coil and have it run it runs just fine, but as soon as I shut the water off it go's out on high head?

    It just started today, but could it be low on charge? It's not even 100 out like it was last week, and didn't have a problem.


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  2. #2
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,136
    Are you sure both fans are spinning the right way?

    Could be a bad cap making 1 spin the wrong way.

  3. #3
    Join Date
    Jul 2012
    Location
    Richland, WA
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    248
    Name:  ImageUploadedByTapatalk1343690193.544788.jpg
Views: 60
Size:  51.8 KBMaybe, so here is a picture of the caps, the one thing I'm not liking is they don't say which cap is for with fan motor.


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  4. #4
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,136
    Read the wiring diagram, that will tell you.

    Or pull wires off and see which one won't run.

  5. #5
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    Boss called and said just replace both caps since I'm there, they both read 9.5mdf and there 10mdf


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  6. #6
    Join Date
    Sep 2007
    Location
    NH
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    1,136
    Have you checked rotation or at least stuck you hand over the blades. You should be able feel the air is not right.

    Or shut the unit off when it's running and look at the blades as there slowing down.

  7. #7
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    After replacing both now it's running and hasn't gone out on high head pressure as of yet


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  8. #8
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078
    I would clean the coil. I have had many that were "clean" but when you actually clean it the dirt poors out.


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  9. #9
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    I cleaned the coil when I first got there and didn't get any major dirt to come out. Cause that was my first though that it was dirty coils.

    We just had one of the other techs do roof PM all all the condensors and Evaps for all the rooftop units less than a month ago.

    Quote Originally Posted by qwerty hvac View Post
    I would clean the coil. I have had many that were "clean" but when you actually clean it the dirt poors out.

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  10. #10
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    4,508
    Quote Originally Posted by caheiman30 View Post
    I cleaned the coil when I first got there and didn't get any major dirt to come out. Cause that was my first though that it was dirty coils.

    We just had one of the other techs do roof PM all all the condensors and Evaps for all the rooftop units less than a month ago.
    Never assume the other tech did his job properly. Just because a coil looks clean, doesn't mean it is. Not to be condescending, but do you know how to tell if a fan is running the proper rotation? I have run into techs who don't know. In fact, I'm training one right now.
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  11. #11
    Join Date
    Jul 2012
    Location
    Richland, WA
    Posts
    248
    I didn't notice right off the bat, but I put my hat over both fans I noticed that one fan was trying to force my hat to fly out of my hand while the other one was sucking my hat down. So I then changed out both caps since they both tested at 9.5mdf when they were 10mdf, once I did that they both were trying to make my hat fly out of my hand.

    Quote Originally Posted by 2sac View Post
    Never assume the other tech did his job properly. Just because a coil looks clean, doesn't mean it is. Not to be condescending, but do you know how to tell if a fan is running the proper rotation? I have run into techs who don't know. In fact, I'm training one right now.

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