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Thread: Trane Air Cooled Chiller
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22-03-2007, 06:31 PM #1
Trane Air Cooled Chiller
Hi,
Does anyone have access to a Trane service manual ?
Twin Helirotor compressors. Lead compressor tripping (every few days) on high oil temeperature. Ran the machine today for most of the day and no problems have reoccurred, exept an alarm for the condenser fan variable speed drive. Setpoint for entering water temp was set at 6 degrees C, thought this was too low as a few evaporator temp trips had been happening so increased to 9 degrees (no glycol in water) and the oil temp seemed to stabilise at about 70 degrees C.
Even better if anyone else has come across this and has an idea. Using R134a refrigerant.
Thanks
a problem shared is a problem halved
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22-03-2007, 07:48 PM #2
Re: Trane Air Cooled Chiller
High oil temp (are those compressors from J&E Hall?) is probably caused by excessive superheat, but also to low evaporating temperature.
Entering water temperature setpoint for HVAC application should be set to 12°C, definitely not to 6°C.
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22-03-2007, 08:04 PM #3
Re: Trane Air Cooled Chiller
Badged as Trane compressors but probably manufactured under licence. I had at first thought that either part load conditions or undercharge may be the problem (not enough suction gas cooling motor). Anyway, reset setpoint up on water, and will have to see what happens. I did have a similar problem once and it was all because of a failing suction temperature sensor.
a problem shared is a problem halved
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22-03-2007, 08:13 PM #4
Re: Trane Air Cooled Chiller
Oh, yes, part load also causes high discharge temperature
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22-03-2007, 08:55 PM #5
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22-03-2007, 10:27 PM #6
Re: Trane Air Cooled Chiller
What type of unit is it?
Normal oil temperature is a few degrees above condensation temperature, not 70 dgrC
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22-03-2007, 10:30 PM #7
Re: Trane Air Cooled Chiller
Also please give me suction temp, discharge temp, liquid temp. entering and leaving water and entering and leaving air, RLA, oil temp and suction and discharge pressure both from display as well as gauge!
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22-03-2007, 10:54 PM #8
Re: Trane Air Cooled Chiller
a problem shared is a problem halved
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22-03-2007, 11:05 PM #9
Re: Trane Air Cooled Chiller
You probbably mean RTAB200!
Trane chillers work on leaving water, not entering!
Suction around setpoint should be around 2 bar!
You should have a UCM-LCD controller, please check and see if pressures in UCM are almost the same as gauge-pressure!
If you can provide me with the other data i'll know more!
Partial load shouldn't matter since it has an electronic expansion valve and UCM will try and keep superheat at 3,5K
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22-03-2007, 11:42 PM #10
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22-03-2007, 11:45 PM #11
Re: Trane Air Cooled Chiller
No I mean RTAP200.
This is only an only an intermittent fault not one that occurs more than every few weeks.
Anyhow, I have rescheduled a return visit to check for any reoccurrence, which I don't expect, as this oil fault was always occuring with a low evaporator temperature fault. The setpoint is on entering water temperature and not leaving water temperature. It is the entering water setpoint that is the value that the chiller controls. It was set at 6 degrees C, and was running with an entering water temp of 6.3 and a leaving temp of 5.3 degrees.
Thanks for all input.a problem shared is a problem halved
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22-03-2007, 11:48 PM #12
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22-03-2007, 11:50 PM #13
Re: Trane Air Cooled Chiller
Are you sure about the setpoint! Please let me know!
Checked the trane site and there is no RTAP!
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22-03-2007, 11:51 PM #14
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22-03-2007, 11:53 PM #15
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22-03-2007, 11:59 PM #16
Re: Trane Air Cooled Chiller
I'll be honest, I work at Trane and never heard off an RTAP! All our chillers work on leaving water, except for a few smal scroll chillers!
If a suction temp sensor is changed, the saturated evaporator sensor also needs to be changed since they are a pair!! That's why I asked!
Let me know what you saw!Last edited by Lowrider; 23-03-2007 at 12:09 AM. Reason: spelling
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23-03-2007, 12:07 AM #17
Re: Trane Air Cooled Chiller
An aircooled screw chiller from Trane has an oilcooler at the top on each site of the condensor. Oil from the separator will go through the condensor into the screwcompressor. Here's the oil temp sensor. The sensor should be 10k ohm at 25dgrC.
Possible the sensor is defect, check with 50k ohm meter, or the ucm is at fault. This can be checked by placing a 10K ohm resistance after removing the sensor wires on the ucm. if it's off by more than 2 dgr above or belowe, replace the board on which the sensor is connected!
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23-03-2007, 12:10 AM #18
Re: Trane Air Cooled Chiller
a problem shared is a problem halved
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23-03-2007, 04:52 AM #19
Re: Trane Air Cooled Chiller
US Iceman, I was on the Trane website and did notice a RTAA air cooled, helio compressor section, with literature. use this link and click on product literature
http://trane.com/Commercial/
Hope this is what your lookiing for
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28-03-2007, 06:31 PM #20
Re: Trane Air Cooled Chiller
In your post you mentioned the condenser variable speed drive fault.Since the oil is cooled via the condenser air flow maybe at low ambient temps there is not enough cooling for the oil made worse if the drive is playing up.Have seen this on York chillers at low load.
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31-03-2007, 07:27 PM #21
Re: Trane Air Cooled Chiller
Did you visit the site yet and if so, what did you find?
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10-04-2007, 01:09 PM #22
Re: Trane Air Cooled Chiller
Well, Sanderh is right - there's no such thing as a RTAP.
It may be a RTAD? Sometimes the name plates aren't too clear. Or is it a rental chiller? They may have a different model no.
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10-04-2007, 05:14 PM #23
Re: Trane Air Cooled Chiller
RTAD is possible!
A RTAD has a lcd touchscreen, techview. The RTAC has the UCM-CLD.
If it's a rental than they must have renamed it. In the Trane datbase there's no RTAP.
I think a RTAD would be more logical!
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10-04-2007, 09:36 PM #24
Re: Trane Air Cooled Chiller
Sander, it's the other way around.
RTAD = UCM-CLD
RTAC = CH530 (Techview)
I reckon our chap has a RTAD 200 LN (SE or HE??)
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10-04-2007, 11:19 PM #25
Re: Trane Air Cooled Chiller
Well you're right and you're not! They've both been produced with techview and ucm! But the new RTAD's, at least in Holland, come with Techview. RTWB's still come with UCM-CLD! RTUC's and RTHC also both and RTHD's with techview!
The LN is Low Noise. SE is standard efficiency, HE is High Efficiency. I'll need the serialnumber and manufacturing code and if possible the complete modelcode to tell what's in it (tonnage, compressors, fan's, condensor etc!)
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11-04-2007, 08:50 AM #26
Re: Trane Air Cooled Chiller
I've yet to see an RTAD over here with a Ch530?? I guess I'll have to go check. Wouldn't like to assume anything where Epinal are concerned!
As far as I know any C series rotary chiller has a CH530 (Techview for anyone who hasn't heard of a CH530), as well as most of the current scroll based chillers (the CGAN's have the CH532).
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11-04-2007, 08:30 PM #27
Re: Trane Air Cooled Chiller
We even have CGWN's with CH530.
At the moment we are building 6 cooling/heating centres complete with BAS (Tracer Summit) ranging from 8MW to 26MW.
Also a lot of coolcentres with multiple RTWB's and Chiller plant manager!