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Thread: Capillary Tube
05-08-2010, 05:03 PM #1
I checked out a under counter refrigerator/freezer for a friend today. The company that normally takes care of his stuff said it won't hold a charge and they can't find the leak.
So I check it out. First I check the coils and notice a wiring mess behind the evap panel. So I clean it all up. I fire it up. It runs a 190 head, but suction drops down to 7psi. Then it slowly climbs and compressor shuts down on internal overload. I think it's a clogged cap tube. So I remove the gas on the low side and still have 150psi on the high.
So I conclude it's a clogged cap tube. Now my question is I plan on replacing the cap tube and drier. I searched on the forums about this and saw the supco link for sizing. But it lists low temp or med temp. What if it's both? Also do I really need to replace the oil, like I read on some of the posts.
Btw- It's a Enodis UC4148 refrigerator or freezer. And it has a Copeland AFE11C3E-1AA-301. The 301, I think means it's a non oem compressor?
Any help for a novice when it comes to small refer?
05-08-2010, 05:16 PM #2
I am no expert on this subject but will relay what was explained to be about replacing the oil. Im my experience (very limited) the 2 systems I had run into with restricted cap tubes was caused from the condensors being blocked and the oil turning to wax. I tried blowing out the tube and was informed on some tricks after I was done working on the machine so i did not try them.
1. you can try and heat up the tube and free that wax build up.
2. cut off the first couple inches of the tube and braze it back in as this is where the restriction most likely occurs ( of course assuming this is what caused your problem..
So, replacing the oil, or compressor ( as it was recommended to me) is a not a bad idea to avoid future problems. Both times Quotes were given for the repairs the customer opted for a new unit..
Like is said ASCJ I asked these questions about 2 refrigerators I worked on and these were the agreed responses I was given. Just wanted to pass this info on to you. Good luck.Gotta have the right tool for the job!
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05-08-2010, 05:27 PM #3
05-08-2010, 05:29 PM #4
05-08-2010, 06:31 PM #5
Are we talking 134a and poe oil ? Ascj so is it medium temp or is it a freezer? Describe the evaporator. Is there an evaporator fan? Is there a defrost heater?Challenge yourself, take the CM test --- Certificate Member since 2004 ---Join RSES ---the HVAC/R training authority ---www.rses.org
05-08-2010, 06:39 PM #6
The Delfield (Enodis/Manitowoc) UC4148 is a 48" 2-door undercounter freezer and has a 1/3 HP R404A low temp compressor.
It calls for a .036" x 168" cap tube.
05-08-2010, 07:46 PM #7
05-08-2010, 07:58 PM #8
According to the tag it can be a refrigerator or a freezer........but my friend wants it to be a freezer. It's 404a.
I know the cap tube is clogged and needs replacement. I just really wondering if the oil needs to be replaced.
05-08-2010, 08:26 PM #9
If the capillary tube is plugged, yes you should always change the oil.
These little peanut compressors are so small the only good way to drain them is to cut them loose and invert them...dumping the oil either through the suction port or the low side service tube.
I like to cut the tubing rather than unsweat them. Drain the oil and measure how much you get. Then add the same amount of fresh POE.
To add oil to a 3/8" tube is easy if you make up a few reducing couplings to form a small funnel. Then pour your measured amount...slowly.
It's not that big a deal. It takes me no more than 30 minutes to change the oil in one of these little guys...and it's well worth it.
05-08-2010, 08:46 PM #10
05-08-2010, 09:20 PM #11
Icemeister aren't you going to tell him why he needs to change that oil? POE!! For everyone else's benefit you can NOT remove moisture from poe oil with a vacuum pump, only a good filter drier (and you might have to change it several times if you don't change that oil). And I would get a steel Alco drier not a copper spun one. You will get less pressure drop from an Alco than a Sporlan.Challenge yourself, take the CM test --- Certificate Member since 2004 ---Join RSES ---the HVAC/R training authority ---www.rses.org
05-09-2010, 11:46 AM #12
One thing that plugs up cap tubes can be organic salts created from moisture in the system and subsequent overheating. Also, residual manufacturing lubricants that the POE oil has absorbed from the system will create deposit to clog a cap tube if overheated. The oil itself will break down if allowed to overheat sufficiently.
So the reason for changing the oil is because whatever the junk is that plugged that cap tube, it's still lurking about the system in the old oil.
When changing a cap tube fresh oil, a good filter-drier and proper evacuation are a must if you want to avoid call backs.
05-09-2010, 01:00 PM #13
Thank You Mr. Icemeister! I knew you could shed some light on the details. Thanks for the good info!!Challenge yourself, take the CM test --- Certificate Member since 2004 ---Join RSES ---the HVAC/R training authority ---www.rses.org