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Thread: Carrier RTU

  1. #1
    Join Date
    Nov 2014
    Location
    Chicago Illinois
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    6

    Carrier RTU

    Wow I feel bad for this customer in a way. They are renting a office space and they have a carrier 48TFE009. The circuit board was burnt out at the beginning so got it up and running no problem. a few days later I got another call for no heat at the same place but this time the board was fine but bad gas valve. Replaced that got it running again no problem. A week later I got yet another call for no heat. This time im getting rollout bad with a cracked heat exchanger. Unreal! when it rains it pours. Anyone else have a similar crazy call issue like this?

  2. #2
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,498
    On any initial call for an old unit like this, I inspect the HX. If it is after September, I try the heat.

    If The HX is good and I need to replace a board, I will write up a rollout as well.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #3
    Join Date
    Nov 2006
    Location
    Wisconsin
    Posts
    294
    Quote Originally Posted by timebuilder View Post
    On any initial call for an old unit like this, I inspect the HX. If it is after September, I try the heat.

    If The HX is good and I need to replace a board, I will write up a rollout as well.
    I agree with time builder. Most of our custimers have seasonal maintenance, which would include a check of the hx for the heating pm. On the customers that only call for service, I will always check the hx.
    I probably found half a dozen hx's that were bad on non maintenance plan customer's units. Not only did this prevent a future service call (rollout), but it also gives me peace if mind that the unit is operating safely.
    Besides, on most rtu's, it doesn't take that long to get access to the hx anyway.

  4. #4
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    4,830
    If you would have gone thru the unit thoroughly on the first call you wouldn't have had to return.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    With a burned board I would have held my nose and told the customer that I can't check the gas valve or other functions properly until I get the unit powered up.

    The board is needed to run the inducer and make the spark, along with opening the gas valve. That's a lot of jumpers if it's a 208 volt unit, and something I would not usually do unless the customer asked if he should replace the unit instead of repairing it. In that case, I might get out my jumper collection and pretend that I am the board.

    BUT, I would not attempt it with a 460 unit.

    If I tell them in advance about all of the board functions, and that I need to replace it to really check the unit, then they are not surprised if a gas valve has gone bad.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,498
    Duplicate post.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







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