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  1. #1
    Join Date
    Aug 2006
    Location
    ohio
    Posts
    259

    carrier 30gxn225 low economizer pressure transducer fail-2

    I have a 225 with an occasional trip of this code t099 when off for a while. This translates to econo pressure is less than 12# less than suction pressure. I have watched this pressure from the navigator and on a start-up it climbs slowly, so after a reset it will be fine. This is on circuit b the single stage compressor. So maybe there is a shrader under the transducer from the factory that is not open fully or what. This is not a brazed plate economizer it is the tank style. So here is my scenario- the exv doesn't close off 100% so the evap fills with liquid above liquid level setpoint, then when the chiller starts up the exv stays closed until level drops and due to it being closed the econo pressure will drop below suction pressure on a cold start up. But this backpressure valve from the oil separator with the 3/8 line does what for the system? I would think if this was open to the econo pressure line then this would cause the pressure to rise faster? Am I over thinking this or am I close? With this type of econo tank I can not see the valve operate through the sight glass because there isn't one. But when I use the test mode and I open then close the valve you can hear the refrigerant equalizing well after clicking from the valve closing occurs.

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,720
    How about a log of pressures and temps and do you have suction service valves?
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  3. #3
    Join Date
    Aug 2006
    Location
    ohio
    Posts
    259
    Well when it runs, it runs fine, I left it off overnight and started it this morning and it didn't trip off the econ press stayed at least 8# over the suction press. And no, I have no isolation valves.

  4. #4
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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    Last edited by jpsmith1cm; 04-19-2013 at 07:35 PM. Reason: non AOP Pro Member

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,677
    sfb840

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

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