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RTAA High Oil Temperature
Anyone know why I would get a high oil temperature latched fault if the temp is below 150? Circuit does not seem to load and unload properly either. I checked the solenoid operation while running using the toggle method and it does respond but not on the UCM. I was gearing toward a bad/faulty sensor since the superheat is running between 2.9 and 3.4 and everywhere in between.
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clean condenser and make sure fans are running.,
no signature
blast'em man blast'em
!!!KILL THE TERRORIST!!!
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Originally Posted by
Eastcoastchiller
Anyone know why I would get a high oil temperature latched fault if the temp is below 150? Circuit does not seem to load and unload properly either. I checked the solenoid operation while running using the toggle method and it does respond but not on the UCM. I was gearing toward a bad/faulty sensor since the superheat is running between 2.9 and 3.4 and everywhere in between.
What do you mean by circuit not loading and unloading properly?
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oil temp trips most of the time come from fan's or dirty coils. and if you don't use a pressure washer, you are pissing in the wind.
and I am curious of the loading thing, start up chiller, should run unloaded for a min or so, then work itself up to 100% or so depending on load, then as evap load diminishes the compressor will unload/ step unload down to 48-50% RLA, until conditions exhist that it doesnt need that circuil to maintain LWT setpoint.
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provides more data on oil temperature, complete model of the machine, you have to load the test manual compressors
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Probably does it's trick at night when your not looking. Low load, high head, high superheat, high oil temp.
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Originally Posted by
Eastcoastchiller
Anyone know why I would get a high oil temperature latched fault if the temp is below 150? ...
the high temperature diagnostic trips at 170F...so how close do you think you are to this temperature? you say under 150F but what is it really?
what is your ambient temperature? the oil temperature is going to run about 40-60F higher than ambient IF EVERY THING IS CLEAN AND EVERY FAN IS RUNNING AND IN THE RIGHT DIRECTION.
if your ambients are higher than 120F, then you may trip on high oil temperature even with a clean condenser.
of course, you could have a failing sensor.
"Right" is not the same as "Wise".
Don't step on my favorite part of the Constitution just to point out your favorite part.
Just because you can measure it, doesn't mean it is important. Just because you can't measure it, doesn't mean it isn't important.
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I replaced all sensors except for leaving/entering water temp. I thoroughly cleaned all condenser coils and checked rotation and amperage on fans. Everything seems to be operating good. Circuit A oil temp gets as high as 150 Circuit B gets to 170 and runs a while and shuts down. Yes it seems to happen after we leave the site and once water temp is near setpoint. I was thinking that there might not be enough oil in there? I am going to check that on my next trip there. When I changed the 204 sensor there wasn't any trace of oil on the thermistor which made me think there was not enough oil. It will occasionally run below 150 when unloaded. But immediately goes up to 168-170 when loaded up. Head is 270 and the ambient is right around 102. Full serial and model to follow.
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Everything your describing points to a female step loader that isn't energizing. When a circuit runs fully unloaded for an extended period of time, the oil temp will keep rising and the controller will energize the female step loader to drop the oil temp. You stated the circuit doesn't load/unload properly. When the circuit starts, it should pull about 40-45% RLA, then the female loader will step the current up to about 50-55% RLA, then the male unloader valve will modulate with infanate control. If you don't see that first "step" your female unloader isn't working. Also, check for magnetism at the coil with a pocket screwdriver to check if it's working electrically but the valve could be mechanically stuck.
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19xrv high oil and bearing temps
Having a problem with a 19xrv. Thrust bearing and oil temps climb up to 180. We changed oil cooler/motor cooling filter drier but the nothing changed. Chief engineer tells me that a piece of what he was told was for sound attenuation was removed from the discharge line at at the isolation valve. It was standing up on the top of the condenser and extended thru the isolation valve in the discharge line. This was discovered when they tried to isolate the condenser to pump out the evaporator to replace sight glass o-rings. Machine was put back together but not ran as it is used mainly for winter cooling as it has hotgas bypass. Could this problem be caused by Material from the compressor finding its way into the float chamber? Motor temp is ok 56 degrees.
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Originally Posted by
smith21
Having a problem with a 19xrv. Thrust bearing and oil temps climb up to 180. We changed oil cooler/motor cooling filter drier but the nothing changed. Chief engineer tells me that a piece of what he was told was for sound attenuation was removed from the discharge line at at the isolation valve. It was standing up on the top of the condenser and extended thru the isolation valve in the discharge line. This was discovered when they tried to isolate the condenser to pump out the evaporator to replace sight glass o-rings. Machine was put back together but not ran as it is used mainly for winter cooling as it has hotgas bypass. Could this problem be caused by Material from the compressor finding its way into the float chamber? Motor temp is ok 56 degrees.
Welcome my friend.
You need to start a NEW thread by going back to the main chiller forum and clicking the "new thread" button in the upper left hand corner. You don't want to hijack eastcoastchiller's thread about a Trane RTAA.
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I don't no this paticular machine real well but would not your oil temp preaty much follow your discharge superheat. Check compressor B compared to A right at the discharge line. May be your suction temp is a little high causing your discharge temp to rise. I would think there should not be more than 40 discharge superheat.
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OKAY...changed all the solenoids, valves and previously the sensors. It's still tripping on 170 oil temp. It seems now that circuit will not back off. I think something is broken inside the slide valve. It is trying to back off the coil energizes and everything it just doesn't. The Serial # is U96J37008 and the model # is RTAA0804XH01A3D0BFK. All the fans are working and pulling normal amps, the UCM is responding normally it just seems to me that it is the slide valve. I worked it back and forth and saw the difference in pressure at the cavity schrader going from 60 to 200 psi and then to 150 then to 60 again. I tried to service pump down but it just ran and timed out. Third day on this. Is this slide valve something I should tackle, replace the compressor or call in the factory techs?
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Originally Posted by
R123
Everything your describing points to a female step loader that isn't energizing. When a circuit runs fully unloaded for an extended period of time, the oil temp will keep rising and the controller will energize the female step loader to drop the oil temp. You stated the circuit doesn't load/unload properly. When the circuit starts, it should pull about 40-45% RLA, then the female loader will step the current up to about 50-55% RLA, then the male unloader valve will modulate with infanate control. If you don't see that first "step" your female unloader isn't working. Also, check for magnetism at the coil with a pocket screwdriver to check if it's working electrically but the valve could be mechanically stuck.
agree with the above 100%
It's hard to stop a Trane. but I have made one helluva living keeping them going.
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Originally Posted by
Eastcoastchiller
OKAY...changed all the solenoids, valves and previously the sensors. It's still tripping on 170 oil temp. It seems now that circuit will not back off. I think something is broken inside the slide valve. It is trying to back off the coil energizes and everything it just doesn't. The Serial # is U96J37008 and the model # is RTAA0804XH01A3D0BFK. All the fans are working and pulling normal amps, the UCM is responding normally it just seems to me that it is the slide valve. I worked it back and forth and saw the difference in pressure at the cavity schrader going from 60 to 200 psi and then to 150 then to 60 again. I tried to service pump down but it just ran and timed out.
Third day on this. Is this slide valve something I should tackle, replace the compressor or call in the factory techs?
When you worked it back and forth, did you see a change in amp draw corresponding to your pressure going from 60 to 200psi? Did you check the FEMALE step unloader as I described in my previous post?
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you can also hook a manifold up and apply pressure to loaders and work them, if it does not load its stuck and the head has to come apart.
It's hard to stop a Trane. but I have made one helluva living keeping them going.
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Originally Posted by
Eastcoastchiller
OKAY...changed all the solenoids, valves and previously the sensors. It's still tripping on 170 oil temp. It seems now that circuit will not back off. I think something is broken inside the slide valve. It is trying to back off the coil energizes and everything it just doesn't. The Serial # is U96J37008 and the model # is RTAA0804XH01A3D0BFK. All the fans are working and pulling normal amps, the UCM is responding normally it just seems to me that it is the slide valve. I worked it back and forth and saw the difference in pressure at the cavity schrader going from 60 to 200 psi and then to 150 then to 60 again. I tried to service pump down but it just ran and timed out.
Third day on this. Is this slide valve something I should tackle, replace the compressor or call in the factory techs?
I would not tackle it w/o propper support, compressor replacement no, not needed, but it is a pretty food job, if it is in fact the slide valve I would get factory support, you can cause major damage if not done right.
It's hard to stop a Trane. but I have made one helluva living keeping them going.
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It's very unusual for a slide valve to stick on these GP compressors.
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Originally Posted by
Eastcoastchiller
OKAY...changed all the solenoids, valves and previously the sensors. It's still tripping on 170 oil temp. It seems now that circuit will not back off. I think something is broken inside the slide valve. It is trying to back off the coil energizes and everything it just doesn't. The Serial # is U96J37008 and the model # is RTAA0804XH01A3D0BFK. All the fans are working and pulling normal amps, the UCM is responding normally it just seems to me that it is the slide valve. I worked it back and forth and saw the difference in pressure at the cavity schrader going from 60 to 200 psi and then to 150 then to 60 again. I tried to service pump down but it just ran and timed out.
Third day on this. Is this slide valve something I should tackle, replace the compressor or call in the factory techs?
Did you pull out and toss the pill filters when you removed the solenoids ???
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