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  1. #1
    Join Date
    Apr 2007
    Location
    Pa
    Posts
    758

    carrier rtu economiser

    Hey guys,
    I have a Carrier rtu M# 48TJF01658AQ S# 2401F90581. Ok my problem is the economiser. I was called out to a job just to make sure the unit was working ok, and it wasn't, and when i got there the compressors where running and it was 45* outside. So with that temp and the setup i know there was a problem. Well i found that the economiser control (which is white in color) was flashing 7 times and that means "return air sensor problem". Well carrier said they never heard of this. Carrier says they have mixed air sensors, discharge sensors and outdoor sensors on this economiser. They think I am nuts but on the control it states " 7 green flashes is return air sensor". I ohmed out the "return air sensor" and got nothing so i know its bad. Does anyone know what I am talking about? And are all of the economiser sensors/thermistors 10,000ohms? If anyone has part numbers that would be greatly appreciated too. Thanks
    Chris

  2. #2
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,148
    How do they plan to use differential dry bulb changeover without a return air sensor?

    I don't have access to the old part numbers, but they exist.

    Here are the current sensors. I don't think they are the same as the old one.
    Perhaps you should have read the instructions before calling.

  3. #3
    Join Date
    Nov 2004
    Posts
    210
    do you know which controller it is,novar,penn johnson or a premier link? i think the penn johnson is the only one with code 7, does the controller have 4 potentiometer dials, a status led and a config. button?
    Last edited by airdata870; 04-05-2008 at 12:05 AM.

  4. #4
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,702
    Hey kid your missing a letter or number in your M# and I believe you have a johnson controller and a johnson actuator. Actually missing a few letters or numbers
    Last edited by Dallas Duster; 04-05-2008 at 04:54 PM. Reason: new info

  5. #5
    Join Date
    Apr 2007
    Location
    Pa
    Posts
    758
    I wasn't able to find any more info/numbers on the unit. The controller does have a green led light/status light and has four dials on it maybe it is the Penn controller?

  6. #6
    Join Date
    Nov 2004
    Posts
    210
    Quote Originally Posted by HvAckid82 View Post
    I wasn't able to find any more info/numbers on the unit. The controller does have a green led light/status light and has four dials on it maybe it is the Penn controller?
    hvAc82,see if this helps.let me know
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