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Thread: blown out filter dryer
02-24-2010, 06:41 PM #1
blown out filter dryer
filter dryer blew desiccant through r- 404 system. Took out headmaster and and txv! How do you make sure desiccant is out of the system? the refer rack is on the fourth floor the evap on the first.
what caused this? how to prevent this? hows the best way to clean up the system?yes its cold in Michigan. 8x8 box, single evap cooler.
02-24-2010, 07:05 PM #2
02-24-2010, 07:22 PM #3
I'm going to lean towards the filter being plugged very badly, and the pressure differential across the dessicant media became such that it caused the dessicant material to break because it couldn't withstand the difference in pressure.
I say this with no REAL knowledge of the cause, but only offering an opinion.
I have seen the results of this ONCE.
It was an Alco drier in an oil line. It was a new account (to us, anyway) very poorly maintained. I found the beads in an oil regulator. I did my level best to clean them out, but I've got no simple solutions.
I'm seeing disconnect the evap and condensing unit, blow the lines out with Nitrogen. That would be a start, but not enough, I don't think.
I don't envy you.
02-24-2010, 07:54 PM #4
I am having a hard time understanding how dessicant ended up in the headmaster, since the drier should be downstream of it. To the original poster, is the drier installed in the liquid line, or did someone put it in the discharge line?
If it is installed in the liquid line, I would want to be very certain that the high pressure control cuts out at the proper setting, and making sure that the headmaster is functioning properly, so as when the headmaster throttles down, it is only sending hot gas into the receiver to push the liquid down the liquid line, and not just pushing very superheated vapor through the drier, which may cause breakaway of the dessicant.
02-24-2010, 08:02 PM #5
Crap happens, lots of nitro and more nitro and when your sure you got it all you didn't, Large cubic inch and high capacity Liquid line dryers and Suction line dryers should be used, after the system has run for a week or so & I would blow out the lines again and replace the dryers. Location of dryers also can help for instance you can orientate the liquid line dryer closer to the txv to protect it from potential crap clogging up the metering device. Pull it all apart and inspect.
02-24-2010, 09:00 PM #6
safety cut out at 400. unit was off on safety. headmaster loaded with with powder the spring was totally full of it. the txv screen was plugged , the equipment is 4 yrs old same as building. filter dryer 083 is in the discharge off receiver. Has someone else worked on it !I'd say yes because of electrical tap over insulation of txv feeler bulb and bulb mounted wrong ! this is a big mess
02-24-2010, 11:32 PM #7
I would try one of those flush kits that you would use on retrofit systems. The liquid will help force the dessicant out of the lines.
How did it get in the headmaster???
02-24-2010, 11:34 PM #8
02-25-2010, 07:04 AM #9
02-25-2010, 08:10 AM #10Professional Member
- Join Date
- Sep 2008
- Cedar Rapids, IA
Don't forget to check the compressor inlet screen. If this is a can compressor I would pull it out and dump the oil then flush it out with some of that burn out flush chemical a few times.
It may not be the drier. I've found foreign material in systems. For instance a dead bird in a drier can. If whoever installed it originally didn't keep the lines capped until installation or even worse forgot to remove a few rubber plugs you could have a pretty bad mess. I've found the remains of rubber plugs in units that had been running for years and suddenly crapped out.
02-25-2010, 07:32 PM #11
cut open the old dryer it was still in-tacked. pressures would go to 350 and cut out on safety. ? would super seal turn into a fine powder inside a r 404 system ?
I'am totally lost as to what caused this. the headmaster had more powder in it than the txv screen
02-25-2010, 08:04 PM #12
02-25-2010, 10:12 PM #13
NOPE! just like a lot of things I've come across lately seem strange. but we all know the stuff is out there.Now a days you can buy it Shoot it In it's all good ????.. what the heck its only money. IF I KNEW I WOULDN'T ASK??? I was told they had a lot of trouble during the first year and at start up. I'm very reluctant to use dyes or sealer never been trained to use it. nitrogen ,snoop,big blue no co2 inside system either.