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Type: Posts; User: koolncali

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  1. Replies
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    MKnyc- I agree, the RTAA needs to start the pump...

    MKnyc- I agree, the RTAA needs to start the pump and it does both start/stop of the pump and lets the pump run for 5 minutes after chiller is disabled. I use the remote contacts on the RTAA board to...
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    Graham, Yeah last October was about the last...

    Graham,
    Yeah last October was about the last time I had time to really look at this problem.
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    Chiller, The RTAA onboard computer controls the...

    Chiller,
    The RTAA onboard computer controls the pump. I installed a pressure differential switch which is monitored by the BAS for proof of pump before the chiller is enabled. The pump runs for 5...
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    Thanks my friend :)

    Thanks my friend :)
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    Freonrick-Hadn't thought of that one yet, thanks...

    Freonrick-Hadn't thought of that one yet, thanks I'll include this in my troubleshooting.
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    rtaa trips

    One thing I've learned and that's that this can be tricky problem on a RTAA.
    My stage 2 runs perfect. But stage 1 constantly trips on "low saturated refrigerant temperature". I've ran the EXV...
  7. Thread: VFD training

    by koolncali
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    chillerguy- It used to be that when I needed a...

    chillerguy-
    It used to be that when I needed a vfd replaced I would call for the ABB drive (we are sticking to ABB) factory rep and coordinated his visit with the EMS rep. But I stuck my neck out...
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    jayguy- thanks for the word of encouragement, I...

    jayguy- thanks for the word of encouragement, I just need to get back into the habit of double checking everything.
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    Thanks fcs

    Thanks fcs
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    Graham- thanks for trying to get me to think....

    Graham- thanks for trying to get me to think. sometimes i have to be knocked over the head :).

    And thanks to everybody who tried to help.

    It's really a great feeling that there are so many...
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    jayguy- Talk about troubleshooting from afar!...

    jayguy-

    Talk about troubleshooting from afar! Let me tell you that you hit the nail on the head! I read your post then I went and did what I should have done (and normally do) and double checked...
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    chiller- another interesting possibiliy. first...

    chiller- another interesting possibiliy. first I'm going to concentrate on the sensors I replaced since the new alarm started after I replaced them. Then I'll have to look elsewhere if necessary....
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    Psycho- this one is going off on low pressure...

    Psycho- this one is going off on low pressure cutout but I realize that temperature is being converted to a pressure reading so it's all related. I'll keep in mind your input about the solenoids.
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    Graham- Thanks for the great advice, I really do...

    Graham- Thanks for the great advice, I really do appreciate the input from you and all the other guys here.

    Yeah with the discrepancies of readings between my gauges and the UCM readings it looks...
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    Graham- Thanks for the input. My chiller (I work...

    Graham- Thanks for the input. My chiller (I work at a jr college) is an RTAA125 and it does have a low pressure switch for each compressor (2). Looks like 12vdc comes out of the module, passes...
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    Ok jayguy I see what you're saying is that if the...

    Ok jayguy I see what you're saying is that if the pressures are not actually what the UCM is reading and telling the low pressure cutout to open, then it can throw it out of balance and maybe cause...
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    Plugger I ran a check on circuit #1 EXV at the...

    Plugger I ran a check on circuit #1 EXV at the module and it ran the check ok.
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    Graham- it's a RTAA125 chiller. I replaced the...

    Graham- it's a RTAA125 chiller. I replaced the "saturated evaporator sensor" and the "suction temp sensor" because the chiller was tripping daily on "low saturated temperature". I ran the...
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    Maxpower- no it's a packaged chiller sitting on a...

    Maxpower- no it's a packaged chiller sitting on a rack. It has two low pressure switches at the outlet of the chiller barrel.
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    RTAA trips on Low Pressure Cutout

    I need help from anyone who is knowledgeable on Trane RTAA chillers. I previously had a thread because my RTAA chiller circuit 1 was shutting off on "low saturated evap temperature". I replaced both...
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    Excellent advice Paceleader. I will check for...

    Excellent advice Paceleader. I will check for proper load/unloading of the compressor at the conditions you mentioned.
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    Yeah there is i guess i'm in luck.:cool:

    Yeah there is i guess i'm in luck.:cool:
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    Bowhunter- Thanks for the info now I just have...

    Bowhunter-

    Thanks for the info now I just have to see where I can get the part.
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    Cntrl- Thanks I'll check the manual for sh...

    Cntrl-
    Thanks I'll check the manual for sh adjustment. It's a temporary chiller set-up with fire hoses and primary flow only (one pump). The flow is constant. I hadn't thought about flow as an issue...
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    Bowhunter- Thanks for that advice. This morning...

    Bowhunter-
    Thanks for that advice. This morning circuit #1 was in a latched fault "low saturated refrigerant temperature" alarm once again. I took some readings on ciruit #1 while still in alarm and...
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