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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:
  23. Replies
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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.
  24. Replies
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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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    Iqbalissa- 1-I'm not sure yet how to adjust the...

    Iqbalissa-
    1-I'm not sure yet how to adjust the superheat on this electronic expansion valve.
    2- I don't see any evidence of a pressure drop through the drier core
  27. Replies
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    Madhat- This is also a temporary chiller hooked...

    Madhat-
    This is also a temporary chiller hooked up to fire hoses running about 80 feet up to the rooftop air handlers on top of a 4-story building. But I'm responsible for this chiller because i...
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    thanks for the tip TAC and bowhunter I'll check...

    thanks for the tip TAC and bowhunter I'll check the sensors now that I found a manual with the readings. and know what to look for Bowhunter: I figured someone out there had ran into the same problem.
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    Graham- I found a Trane RTAA troubleshooting...

    Graham-
    I found a Trane RTAA troubleshooting manual online that goes into great detail about checking the EXV. So I'll have to dig into that.
  30. Replies
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    Graham- I'm not suspecting low charge. No...

    Graham-
    I'm not suspecting low charge. No setpoints have been changed since the chiller was installed about 2 years ago and it has ran without a hitch up until about 3 weeks ago. The fluid being...
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    The sightglass is clear at all times.

    The sightglass is clear at all times.
  32. Thread: Tools

    by koolncali
    Replies
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    [QUOTE=r404a;2016673]Does anyone here throw or...

    [QUOTE=r404a;2016673]Does anyone here throw or break tools when they get mad when overhauling equipment?


    As an apprentice I worked with a journeyman who had half of his index finger missing on...
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    Allstar- I'll check those readings this week and...

    Allstar- I'll check those readings this week and let you know.
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    That's with pressure gauges attached. Also I...

    That's with pressure gauges attached. Also I found that the pressure readings on the adaptive control are very close to my gauge readings.
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    I've had six Governair units running for about 15...

    I've had six Governair units running for about 15 years and they have been reall workhorses. I've never had a compressor failure(knock on wood) but the factory auxiliary switches on the contactors...
  36. Replies
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    Trane RTAA air-cooled chiller nuance trips

    Ok guys I've got a Trane RTAA 125 chiller with the standard adaptive control. About three weeks ago circuit #1 starting going into a "low saturated refrigerant temperature" alarm which shuts down...
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    compressor removal

    hvac-
    I've replaced several compressors weighing over 500 lbs. and setting high off the ground. I make a wooden box and sit it on a four-wheel dolly. I measure the box and dolly to be even with the...
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    Shiffer- I actually have 3 drives to replace....

    Shiffer-
    I actually have 3 drives to replace. For one building I have an air handler with defective Graham(Danfoss) drives for supply and return motors. Another building has a defective Saftronic...
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    sysint- Great information and links you got...

    sysint-

    Great information and links you got for me. I will put those links in my favorites for later. I have to say you know your stuff.
    And you are also right about the college's project...
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    dingman- Thanks for that info. Now I got to...

    dingman-

    Thanks for that info. Now I got to see if I got what it takes to make it run :)
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    dingman- What I'm doing is replacing an existing...

    dingman-
    What I'm doing is replacing an existing Saftronics drive. I'm want retrofit the Saftronic bypass to the new ACH550 which doesn't appear to be a problem. It looks like the easiest thing for...
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    siemens vs lonworks

    Guys-

    Ameresco usually conducts their meetings with an entourage of engineers, so if one stumbles, another is there to fill in the "missing links". Normally in these meetings is an Ameresco team...
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    siemens vs lonworks

    navair-
    Yeah hopefully that will inspire Ameresco to look out for everyone's best interest :). I will for sure be keeping an eye out for who's going to commission all the equipment.

    ...
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    siemens vs lonworks

    krac/navair-

    Yes all public colleges in California are funded by the state. Our new buildings are being funded by a state proposition passed by voters. <b>Krac</b> right now our 'Termgubinator' is...
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    siemens vs lonworks

    sysint-

    Well my boss and I had a meeting with Ameresco on Thurs but only one of their more recently hired mechanical engineers showed up and just took notes as we went through the "plans" which we...
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    siemens vs lonworks

    PS-
    That's good insight into my situation and great advice. I will take all of that into consideration. A central plant with a screwed up control system would be a true nightmare for me and...
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    siemens and abb speed drives

    krac- ok I was just concerned about rotation, but I know I can stop the motor quickly if rotation is wrong. For fan status I'll use a current sensor switch on one of the 480 leads to the motor to...
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    siemens and abb speed drives

    krac-
    Thanks for the good information. The safety contacts(smoke alarm) will be landed on the bypass so I'll jumper 10 + 16. I've got a diagram of the existing bypass but I'll have to find a copy of...
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    tudormatt- An energy project manager has been...

    tudormatt-
    An energy project manager has been awarded a contract to install a central plant at my campus. I have an existing Siemens BAS running on fiber and copper with a little Apogee and mostly...
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    Siemens and ABB speed drives

    Is anyone familiar with using Siemens to control an ABB ACH550 HVAC speed drive? I have to replace a Saftronic drive controlling a 10 HP return fan motor with an ABB drive and use the existing...
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