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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by US Iceman
Now, your suction temperature at the compressor is 70F. If we take the 70F suction temperature minus the -19F, you have over 89 degrees of superheat added to the evaporator superheat of 7 degrees. That's 96 degrees of total superheat at the compressor. That's enough right there to make the compressor very hot.
It would be nice to know the suction pressure now. The suction pressure SHOULD be close the evaporator outlet pressure if nothing else is wrong. A little lower, but not much.
I quoted US Iceman because his comment is very important because we rely on your measurements and we develop a theory, a possible cause based on this figures you give us.
It's therefore very important that we understand each other very well and that you corretc us eventually if we say something wrong or different from what you have measured.
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by Intermez
The problem with the freezer is not gone. It was there in the beginning with the five plates, and is still there now with just the 3 freezer plates.
Now we know something new! The problem was not probably related to the plates, but essentially the refrigeration system that the five plates were originally connected to.;)
Since two plates are now on a separate refrigeration system and working fine, the problem seems more associated to the actual refrigeration system used for the freezer plates.
It the problem is not a "mouse", I bet it is something left there from the previous service tech. Rubber or plastic plugs that may have been left in something and partially melted when brazing was done.:o :eek:
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by US Iceman
Rubber or plastic plugs that may have been left in something and partially melted when brazing was done.:o :eek:
This is something happened by myself.:eek:
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Re: MP66 & Compressor Overheating
Here's what I did yesterday. Didn't stay too long as it was on my own time. After reading all of your comments and thinking about it for a while, I guess the only way to determine if there is a blockage between the plate outlet and the suction port is to make simultaneous pressure measurents at the two points.
My assumption is that during startup with a cool compressor, is this is when the flow rates through the suction side are the greatest. I first took simultaneous measurments between the inlet side of the dryer (service port already there) and the suction port. The liquid accumulator is between these two points. I also opened the TEV wide open to get the greatest flow rates that I could (higher flow should mean higher pressure drops). I saw only 1 to 1.5 psi drop from the dryer inlet to the suction port. I did this for about 5 minutes, stopping again when the outlet temp reached 225F. My conclusion no blockage in dryer or accumulator. Do you guys agree with this?
Next I did simultaneous pressuren measurements between the plate outlet and the suction port. TEV wide open. Here's the series of measurments as the system started to pull down, again over about a 5 min. period.
EVAP Suction
Out Port
Press. Press.
15 16
13.5 15
13 14
11 12
10 11
9 10
8.5 9.5
All readings in PSI. Sopped again when discharge temp reached 225F. ( Don't like the idea of just letting the system run to let it stabalize, ignoring discharge temp as Peter suggested. From everything so far it think I'd fry the compressor because of very low ***** flow). Suction port temps were high starting around 88F dropping to 81F during the above. Conclusion, no blockage between plate outlet and suction port??
This is all I had time to do, will continue with your suggestions on Monday, back through the plates to the TEV. Will also try to take all the measurements suggested.
Many thanks, Kevin
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Re: MP66 & Compressor Overheating
For some reason the table of pressure measurements and the headings for them didn't come out correctly on the post. The first column of numbers, starting at 15 and dropping to 8.5, are the suction port pressures. The numbers immediately to their right, starting at 16, dropping to 9.5, are the plate outlet temps.
Kevin
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Re: MP66 & Compressor Overheating
D****, previous post, not plate outlet temps., plate outlet pressures!
I need to relax!
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by Intermez
I also opened the TEV wide open to get the greatest flow rates that I could...
If I can make a suggestion... Do not adjust the TXV everytime you do something, please. Just because it has an adjustment stem on it does not mean turn the stem.
This is a very common mistake that people continue to make. They assume if the system is not cooling properly, it either has to be low on refrigerant or the TXV needs to be adjusted. The TXV should be adjusted at full load at normal operating conditions. Once the superheat is reasonable, Leave the valve alone.
I don't seem to remember any mention of a suction line filter drier before. What exactly do you have installed in the suction line between the three remaining plates and the compressor suction service valve?
Right now I'm counting a; suction filter drier, an accumulator, and a liquid/suction heat exchanger. Is there anything else?
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Re: MP66 & Compressor Overheating
Iceman,
I agree on adjusting the TEV. It is the last thing usually touch. Problem is this system is not operating normally and there's no way to adjust the superheat correctly with what appears to be low ***** flow.
Yes, there are three things between in the suction line after the plate outlet. Heat exchanger, filter-dryer, accumulator, in that order. The filter-dryer was only mentioned early on. I said that after I first tried to get the system going unsuccesfully the first things I changed were the liquid line and suction line filter driers.
THanks, Kevin
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Re: MP66 & Compressor Overheating
Just reading your post before I go to sleep (11:15 PM) and coming back from helping my wife. It was very busy today
I thought the same about the suction drier. You didn't speak about that before.
A suction drier is something that blocks sometimes, reason why they install 2 measuring points on it.
If it's a suction drier, in fact a filter, then there are normally 2 measuring points. I suppose tehre is no pressure drop over these 2 points.
Can you make pictures of the complete setup?
You will need to make temperature measurements at the inlet and outlet of each component, starting at the TEV inlet.
Somewhere, there must be a sudden temperature rise, otherwise there was something wrong explained in a previous post or we understood it wrong.
I've seen compressors running at more then 225°F for quit some time (in terms of days)
So don't be afraid to let it run for some longer time then you do now.
Otherwise, you never can measure temperatures, it need some time to stabilise.
Perhaps a little schematic with every component on it and the temperatures you have measured. Try also to measure pressure on every point where you can measure it.
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by Peter
I've seen compressors running at more then 225°F for quit some time (in terms of days)
So don't be afraid to let it run for some longer time then you do now.
I agree with Peter. 225°F is getting warm, but not too bad. Now if the temperature was reaching 270-300°F then I would start to be concerned.
Quote:
Originally Posted by Peter
You will need to make temperature measurements at the inlet and outlet of each component, starting at the TEV inlet.
Kevin, this is absolutely critical information to have for trouble-shooting purposes.
If you mentioned the suction filter drier before, I may have missed it or forgotten it during the on-going discussion. Sorry about that.
If the suction pressure loss is not to excessive, then we have to start looking at other things as well. It would be nice to have the respective pressures and temperatures at each component (inlet & outlet). This allows us to examine each component for relative performance we might expect to see.
Quote:
Originally Posted by Peter
Somewhere, there must be a sudden temperature rise,...
If the pressure loss is minimal, then I think this is the next area we have to investigate. The data will tell us which direction to look at closer.
Have you performed a pump down test of the compressor yet?
This is pretty simple. Jump out or bypass the low-pressure switch. Attach your compound gauge to the suction valve port on the compressor. Now close the suction valve all of the way, so that it closes off the suction line to the compressor.
The compressor should pump down into a decent vacuum within a minute or so. Say 25 in.Hg. Shut the compressor off.
If the suction valves in the compressor are OK, the suction pressure decreases fairly rapidly. If it takes quite a while to pull down the suction pressure in the compressor, the compressor pumping capacity may be in error (leaking rings or suction valves).
If the suction pressure increases very rapidly, the discharge valves are broken. If this pressure rise occurs after the compressor shuts off, you might hear a "hissing" sound. That's the discharge gas equalizing back to the suction pressure.
This is a very easy check to make as it only takes a few minutes.
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Re: MP66 & Compressor Overheating
Will make a complete diagram today.
Pull down test: went from 50psi down to 21 in Hg within 1 min. Sat at 21inHg for next 5 min. Turned compressor off and after another 5 min reading still at 21inHg.
Thanks again guys for hanging in there with me. Off to put in more access ports.
Kevin
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Re: MP66 & Compressor Overheating
Kevin,
When you have the compressor running in a vacuum, you should only keep the compressor running for about 1 minute. If the compressor is going to pull a vacuum, it will do so rather quickly. Allowing the compressor to operate in a vacuum for 5 minutes serves no purpose.
I was trying to remember something you need to understand about hermetic motors running in a vaccum. Don't do this for very long.
The insulation resistance of the motor decreases quickly in a vacuum. prolonged operation in a vacuum can cause other probelms that may force you to change the compressor.
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Re: MP66 & Compressor Overheating
some of the guys I know who use them as vac pumps have run them upwards of two days at max vacuum so they can tolerate the abuse apperantly, befor I never knew that. I use a low temp unit to vacuum out my play systems at home, till I can buy a rotory vane vac pump.
Any case 21"mg that seems rather high for a low temp unit.
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Re: MP66 & Compressor Overheating
Thanks for the heads up on pull-down run time. Will not run longer than a minute in the future. Will get to the diagram tonite. Have some temperature measurements, will get more readings and give full report later.
Did find something interesting. Pressure drop from TEV outlet, through three plate runs, and measured at plate outlet is running about 5 psi. Seems a bit high dosen't it?
Will fill that in with more data on pressures and temps.
Kevin
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Re: MP66 & Compressor Overheating
Latest:
Ran system trying to get it to stabalize. Discharge temperature kept rising. Stopped at 295F, no sign of slowing down.
Found that first plate of three appeared to have lost about 50% of its brine. Made me suspicious bacause of pressure drops through 3 plates I had found earlier (5psi). Easier to bypass this plate entirely than to do anything else.
Ran system with only second and third plates. Was able to get system to stabalize somewhat with discharge temperature about 260F. Ran this way for about 30 min. My camera died so can't attach diagram I drew (figures!). Below is a list of the components, starting at the compressor, through the HP side, TEV, LP side.... Numbers before and after each component are the temperature measurements going into and coming out of that component where I was able to measure. System was still pulling down somewhat so readings were not 100% stable.
80F-COMP-260F
250F-CONDENSOR-115F
115F-RECEIVER-110F (@165psi)
VALVE
109F-FIL/DRYER-107F
107F-30FT. 3/8 LINE-95F
95F-HEAT EXCHANGER-80F
VALVE (pressure here 163 psi)
------------INSIDE COLD BOX
70F-TXV- -5F (@3.5psi)
-5F-PLATE 1- -9F
-9F-PALTE 2- -10F (@1.5psi)
--------------OUTSIDE COLD BOX
20F-HEAT EXCHANGER-40F
40F-30 FT 7/8 LINE-65F
65F-FIL/DRYER-67F
68F-ACCUMULATOR-75F
80F-COMPRESSOR-260F (0 psi @ suction port)
Thoughts?
Thanks, Kevin
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Re: MP66 & Compressor Overheating
Kevin,
See notes below. My comments are in red, next to your original data. Everything looks OK until you get to the red areas.
80F-COMP-260F
250F-CONDENSOR-115F
115F-RECEIVER-110F (@165psi)
VALVE
109F-FIL/DRYER-107F
107F-30FT. 3/8 LINE-95F
95F-HEAT EXCHANGER-80F
VALVE (pressure here 163 psi)
------------INSIDE COLD BOX
70F-TXV- -5F (@3.5psi)
-5F-PLATE 1- -9F
-9F-PLATE 2- -10F (@1.5psi) (about 6 degrees of superheat)
--------------OUTSIDE COLD BOX
20F-HEAT EXCHANGER-40F (at this point you about 50 degrees of superheat!, 40F minus -10F)
40F-30 FT 7/8 LINE-65F (now you have an extra 25 degrees of seperheat!, 65F minus 40F)
65F-FIL/DRYER-67F ( 2 more degrees of superheat)
68F-ACCUMULATOR-75F ( 10 more degrees of superheat)
80F-COMPRESSOR-260F (0 psi @ suction port) (+ 5 more degrees of superheat)
Adding up the numbers we have 6+50+25+2+10+5=98 degrees total. If we adjust this for pressure losses we 100 degrees of total suction superheat being added!!:eek: (80F at the compressor minus the saturation temperature at 0 psig = -20F = 80F minus -20 = 100 degrees.
That's why the compressor is hot!
The suction pressure loss does not look too bad, but the superheat is not at all helpful.:mad: :mad:
The superheat looks OK until you get outside of the box. Then somehow, when you are leaving the second plate and getting outside of the cold room you are adding about 30 degrees of superheat. (20F - -10F = 30 degrees). That's way too much! Six degrees of this came from the plates. Then to top it off, the suction heat exchanger is adding another 20 degrees. The two of these equal half of the total!
Does any of the suction line have insulation on it?
Is the suction line outdoors in the sun... Exposed?
Does the accumulator have the liquid line connected to it with seperate connections? Or, does the suciton line come into and leave the accumulator only? Does the accumulator have four connections or two?
Somewhere between the outlet of the second plate and leaving the cold room, you have a major problem...
Pictures of the installation would be nice to have as well as a piping diagram.:o
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Re: MP66 & Compressor Overheating
Just joining again this thread, wasn't able to post sooner.
We finished today a job that normally had to be finshed yesterday. Problem: 3 hermetic units where 3 lines were swapped, even a suction with a liquid line.
Most of the lines were installed underground.
This is a general note for many 'IP-posters': if you're not used to work with psi and °F, then these posts takes much more time to read and to 'understand and translate' them, especially when most of the answering has to be done in the evening after a very busy day. So, most of the times, I stop reading these posts and try to concentrate on other postings.
But this problem is to interesting to let it go now.
See that there were some posts and USIceman answered them all.
A schematic should be very usefull and some pictures is of course the best solution.
USIceman already made the necesarry calculations and conclusions: like already said in my post of 19/08, I think you need to replace the line between last plate and compressor inlet.
But you can do this much moire easily and faster in soft 5/8 copper, 7/8 is in my opinion far too large. And remove the accumulator and the HE at once, you don't need these fancy tricks. The more unnecessary items you install, the more they're prone to failure. (Is thsi a correct expression :) ?)
It's also only 30 ft of 5/8 copper, installs fast and without a lot of soldering.
I also suggest that you desolder it direct from the last plate and look once with a light in the hole if the tube inside the hole hasn't collapsed like the picture I posted in one of the first posts.
What's seems important for me - but USIceman pointed already to this - is the sudden temperature rise after the last cold plate and before the entrance of the HE.
Then in the HE, there's also something wrong.
What about a defective HE where there's an internal bypass between low and high side?
USIceman, with the 4 connections suction accumulator, you're thinking about the type with a HE build into it?
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Re: MP66 & Compressor Overheating
Hi Peter,
Sorry to hear about the underground piping problem. I worked on a job similar to this. Some split units separate by a roof. The installer had the liquid lines crossed between the two condensing units. It was fun to watch the refrigerant move from one system to the next, before I found the problem.:rolleyes: It was even more fun to explain it to the owner of the firm that installed it.:D I have never seen someone get so mad!:p
Quote:
Originally Posted by Peter
USIceman, with the 4 connections suction accumulator, you're thinking about the type with a HE build into it?
That's it exactly Peter. If he has two heat exchangers adding heat to the suction line, that is almost two, too many, if you know what I mean.;)
Quote:
Originally Posted by Peter
The more unnecessary items you install, the more they're prone to failure. (Is this a correct expression :) ?)
Correct on both counts Peter.
The interesting thing is, with the 7/8" suction line he has almost 3.5 to 5 psi pressure loss. This seems very high, but for the time being, I think it is a minor problem.
I cannot see how he would have this much pressure loss in only 30 feet of tubing??? Especially for this low of a capacity system?
Sorry about all of the IP units Peter. I'm facing the same problem you have. I'm trying to help the guy out, and I still have work to do also. A sorry excuse I know.:o
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Re: MP66 & Compressor Overheating
Thanks!!!
Question, could all the temperature readings along the suction side be explained by very low refrigerant flow? Wouldn't this account for all the temperature rise? Pressure readings just don't point me to a particular point of blockage. If the TEV is somehow limiting flow to a low value is it possible to still get a superheat reading of 6F? Just a thought.
Suction line is insulated completely except for the heat exchanger. Suction line is indoors. Accumulator is 2 port, suction side only, no liquid line heat exchanger in the accumulator. Remember also that these readings are not an instantaneous snap shot. It took 5 or 10 minutes to get them.
The heat exchanger is coming out. Question about heat exchangers: I agree that thermodynamically it dosen't gain anything, but 1) dosen't the higher suction line temperature after the heat exchanger reduce heat gain along a long suction line because it is so much below ambient? and 2) in a cold plate system doesn't the lower liquid temperature create more rapid plate pulldown? In a cold plate system people are interested in pull down times more than total energy usage it seems.
Will take some pics as soon as I get camera working. I agree with replacing the 7/8 line with 5/8 line, pain in the butt, due to routing of line, but it is the right thing to do. It's impossible to get a view into the plates without totally unmounting them. They're right up against a panel on the top side of the plates with rt. angle flare connections. Not even sure how to disconnect the lines without removing the plates......which I'll have to do anyway to put in 5/8 line now that I think of it.
Supper time, must go NOW according to wife.
Kevin
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by Intermez
1) dosen't the higher suction line temperature after the heat exchanger reduce heat gain along a long suction line because it is so much below ambient? and,
2) in a cold plate system doesn't the lower liquid temperature create more rapid plate pulldown?
1) heat transfer wise, the lower TD would add less heat to the gas. So, in theory you are correct. I still don't think the ambient is adding this much heat, unless the suciton line goes through a VERY warm space.
2) Cold liquid does add capacity, which would reduce the pull down time.
Quote:
I agree with replacing the 7/8 line with 5/8 line,...
Unless the suction line has a kink or blockage in it somewhere, I would stay with the large size. One thing that might be proven quickly by changing the line is to see if the system works any better. Normally I hate to recommend this, but then, since I can't see the system I'm down to trying things.:(
Earlier in another post you mentioned one of the plates had leaked the glycol out of it. Where did the glycol go?
At this point, pictures are badly needed .
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1 Attachment(s)
Re: MP66 & Compressor Overheating
On the picture I post now, you can see also a leak I had, the TIG welded seem was teared. The picture needs to be turned 90°
So mostly they leak due to the continuous expansion and shrinking of the ice.
A standing plate tears mostly somewhere against the floor, mostly through a very small leak.
This becomes a really s**y job.
Quote:
in a cold plate system doesn't the lower liquid temperature create more rapid plate pulldown? In a cold plate system people are interested in pull down times more than total energy usage
Yes and no, lower liquid temperatures means indeed faster pull downs in case this subcooling was created by other means of the system itselves (additional cooler, the ground, lower outside temperatures,..)
But with a HE you expanded also the suction gass with the warm liquid - energy was transfered from one to teh otehr side - so, indeed less liquid must be circulated due to the higher enthalpy of it but on the other hand the compressor must pump a larger amount of expanded gas, so a smaller mass flow at suction side.
So, in my opinion, the first compensates the second and thermodynamically seen, you can't 'create energy' in a HE.
I once read a paper - and I have stored it somewhere on my computer - about the benefit of a HE where they calculated the savings.
Can someone provide me a link to the used TEV of Sporlan? Searched for it in teh weekend but didn't find it.
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Re: MP66 & Compressor Overheating
But with a HE you expanded also the suction gass with the warm liquid - energy was transfered from one to teh otehr side - so, indeed less liquid must be circulated due to the higher enthalpy of it but on the other hand the compressor must pump a larger amount of expanded gas, so a smaller mass flow at suction side.
Trying to get the "quote" to work as you guys use it. Quote is the above in case it doesn't work.
Understand what you said, but will the compressor in the above situation work harder, pull more amps, and add energy to the system....allowing faster pulldowns? Not interested in creating energy for a free ride with a heat exchanger, but interested in getting more out of the compressor allowing faster pulldowns. Have you ever seen an analysis of pulldown times with/without a HE regardless of energy consumed by the system?
Parker/Sporlan page very out of date. Will look for specs/info on the TEV in system.
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Re: MP66 & Compressor Overheating
Here are two links that you've probably already seen. The TEV is a GF-1Z that isin't specifically referenced. Unit is one ton, R-12 low temperature bulb charge.
http://www.sporlan.com/10-10.pdf
http://www.sporlan.com/210-60.pdf
Question: If there is a blockage somewhere in the suction side after the TEV why don't I see high pressure readings when I measure the pressure immediately after the TEV?
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Re: MP66 & Compressor Overheating
Here is a link to a very good source that one of our other members posted:
http://www.refrigeration-engineer.co...ead.php?t=5590
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by Intermez
Not interested in creating energy for a free ride with a heat exchanger
The first Law of Thermodynamics states that the amount of energy in any given thermodynamic system is constant. Energy cannot be created nor destroyed.
Energy is described as the ability to do work.
A heat exchanger just exchanges heat energy.
No free ride I'm afraid :)
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Re: MP66 & Compressor Overheating
Kevin,
To use the quotes, try this:
First type in... Left bracket then quote=Screen Name then right bracket
Type or copy the quote you wish to add here.
Then type in... Left bracket then /quote then right bracket
This is the syntax required. What you should end up with is between the brackets, including the brackets. Does that help?
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Re: MP66 & Compressor Overheating
[ quote=Snarfawidget ] blah blah blah [ /quote ]
like that but with out any spaces inside the brackets. Or simply use the word buble thing up top that says "wrap in quotes" after high lighting the text to be quoted.
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Re: MP66 & Compressor Overheating
Quote:
I once read a paper - and I have stored it somewhere on my computer - about the benefit of a HE where they calculated the savings.
Here's one that says a liquid suction heat exchanger does not improve COP.
http://www.irc.wisc.edu/file.php?id=49
To quote the conclusion of a tedious paper:
Even though the liquid-suction heat exchanger has a negative impact on system performance, the system does benefit from the heat exchanger by preventing vapor in the liquid line before the expansion valve. The system designer must thus be very careful in choosing when to install a liquid-suction heat exchanger in a refrigeration system.
What makes sense to me is that any heat gained in the suction line after the evaporator is wasted work. Thus, transferring as much as possible from the suction line to the liquid line is going to reduce ambient heat gain and improve COP.
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Re: MP66 & Compressor Overheating
Thanks for the directions on using the "Quote" function.
Did some digging on heat exchangers. It seems the answer isin't so simple. See http://www.irc.wisc.edu/file.php?id=49
It seems that it all depends on the refrigerant used, mostly. Food for thought.
Kevin
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Re: MP66 & Compressor Overheating
Seems that this link isn't working.
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Re: MP66 & Compressor Overheating
Peter,
Tried clicking on the lick a few times. It worked for me. It's a PDF file. Here's the link for their HTML version:
http://72.14.209.104/search?q=cache:...&ct=clnk&cd=12
Hope this works, VERY long link.
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Re: MP66 & Compressor Overheating
Peter,
I think this is the report I sent to you earlier this year. It is probably the one you were thinking of.
PS. Kevin, what has been happening with the project? We went from a problem job to the pro's & con's of liquid/suction heat exchangers...
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Re: MP66 & Compressor Overheating
Got sidetracked on another job. Working on putting in a temporary 5/8 line to bypass the 3/4 to see if that makes a difference. If that works.......then I'll have a least another day to make it permanent. You wouldn't beleive where the 3/4 is routed, but that's another story. Also laid my hands on another TEV, perhaps better (1/2 ton rather than 1 ton and externally equalized), that I'll try. I'm at the point of trying things to see if they make a difference. Another thing I thought of is that since the system was originally R12 with mineral oil, might have some kind of oil/wax mixture sitting in the plates that's causing a partial blockage. Just don't think it is this bacause the pressure drop isin't terrible. If the 5/8 line and other TEV don't do anything I'll try flushing the plates.
Question: If there is a blockage after the TEV somewhere, why don't I see bigger pressure drops on the suction side? Wouldn't I build up liquid before the blockage and see a temperature drop after it?
Thanks, Kevin
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Re: MP66 & Compressor Overheating
why are some owners so frugaly inclined? By now I'd have had the system teared out and a new one put in, then sell the old one as parts.
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by The MG Pony
why are some owners so frugaly inclined? By now I'd have had the system teared out and a new one put in, then sell the old one as parts.
Selling parts with probably a fault in it? And selling cold plates already used? It's already a small market for these systems.
And I also disagree with your way of solving this problem, there' most likely nothing wrong with all the plates nor the compressor. So why replace those?
There's somewhere a fault in the system that must be localised and repaired afterwards. That's all.
Replacing all the parts, well, everybody can repair this way everything.
I then even can repair this way a Rolls Royce Trent 500 jet engine.;)
This isn't the right way because your don't learn anything doing it this way.
These kind of problems, well you can learn so many of it.
Wonder why so few join this thread.
What does "frugaly inclined" means?
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Re: MP66 & Compressor Overheating
HI Peter,
Quote:
What does "frugaly inclined" means?
A fancy way of saying someone is cheap, or will not spend money.
Quote:
Originally Posted by The MG Pony
By now I'd have had the system teared out and a new one put in...
This is the difference between a good service tech and a parts changer. Anyone can change parts. Not very many can find the problem and then fix it correctly.
Quote:
Originally Posted by Peter
I then even can repair this way a Rolls Royce Trent 500 jet engine.;)
That's true Peter.:D I want to be a brain surgeon, but I cant find any spare parts to change.:p
The system Kevin is working on is one of those he will remember I'm sure. These are the type of problems that make a good service tech better.
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Re: MP66 & Compressor Overheating
Quote:
Originally Posted by US Iceman
The system Kevin is working on is one of those he will remember I'm sure. These are the type of problems that make a good service tech better.
"Voila" said the French tech.
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Re: MP66 & Compressor Overheating
Peter,
You are such a master of the languages!:D
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Re: MP66 & Compressor Overheating
I hate to repair things by swap out. Peter....your suggestion I believe......change the 7/8 to 5/8 suction line bypassing all the "stuff". Unfortunately, I happen to agree with you in this case although the readings don't directly support it. The TEV, that's all my idea, will take full responsibility for that one. Compressor and plates, can't be there.....I hope.
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Re: MP66 & Compressor Overheating
So do I but if time is important on a production system and as you said it was old to boot then seems like the logical choice. Over time I have learnt that after a point there is no reason to continue fixing it up. I've been interested to see the problem solved as well, but an old system that had issues be for hand well like I said thats me.
FYI I didn't say swap out I said flat out replace the whole lot, I'd re-assemble the old one just to figure it out, sell of what was worth any thing.