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Post by birkie on Oct 4, 2018 13:31:13 GMT
Last night I also attached a funnel to the suction line and took out the schrader core in the valve that had been previously installed, it is located in the line the feeds in from the float. How do you like that positioning (at the end of the liquid line) for an access port, vs somewhere on the suction line? It sure is a convenient and low-risk place to put it. The one thing I worry about is its suitability for measuring suction pressure, as it is well below the surface level of the refrigerant in the evaporators; but I don't know if that matters in a practical sense. The nominal fill of 13 lbs of SO2 calculates to be about a gallon and a pint 🍺, so that makes sense!
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Post by solarmike on Oct 4, 2018 18:46:32 GMT
The nominal fill of 13 lbs of SO2 calculates to be about a gallon and a pint 🍺, so that makes sense! Wow I had no idea they took that much SO2...... I figured it was about the same as a FEA with freon.... That's amazing...
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Post by Travis on Oct 4, 2018 19:38:21 GMT
DR’s are little piggies 🐷. That’s my main reason for wanting to convert them to something more friendly.
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Post by coldspaces on Oct 13, 2018 2:47:25 GMT
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Post by turbokinetic on Oct 13, 2018 9:58:53 GMT
Wow, that looks like quite a lot of debris was in the evaporators! Is that hard and gritty, or more like softened varnish?
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Post by coldspaces on Oct 13, 2018 13:05:49 GMT
Wow, that looks like quite a lot of debris was in the evaporators! Is that hard and gritty, or more like softened varnish? A few pieces were larger and hard still. The stuff from the last flush done is still in the pan and all the Clean Shot has evaporated. It is real fine and fells like talc powered if rubbed between the fingers.
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Post by turbokinetic on Oct 13, 2018 13:16:04 GMT
Wow, that looks like quite a lot of debris was in the evaporators! Is that hard and gritty, or more like softened varnish? A few pieces were larger and hard still. The stuff from the last flush done is still in the pan and all the Clean Shot has evaporated. It is real fine and fells like talc powered if rubbed between the fingers. That's really interesting. Makes one wonder what is breaking down into a powder? I would expect if it were compressor mechanical wear particles, it would be more metallic and sludge-like. It's almost like it was a precipitate formed by some chemical process over the years; or possibly residue left in the system which migrated into the evaporators. Another theory would be failure residue from the original cotton winding burnout. It could have emitted "smoke" into the system which was entrained into the oil. Or; it could be a result of moisture reacting with SO2; forming an acidic environment. The acid could have reacted with something in the system, leaving a precipitate? Just a lot of things can happen in 80 years!
Regardless, it's great that you got it out.
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Post by coldspaces on Oct 14, 2018 3:26:06 GMT
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Post by birkie on Oct 14, 2018 14:55:06 GMT
I did two more flushes tonight and made a couple quick videos for you all. 1st me spinning the Pigs with Clean Shot inside. Wow, that makes it look easy! I love the sounds of the liquid slowhing around in them. That looks very effective for getting every inch of interior surface clean. I've been reading about the cleaners you've been using. CF20 is patented: patents.google.com/patent/US5643860It looks to be mostly glycol ethers, which have high boiling points of around 200C. The patent specifically mentions its ability to dissolve carbon deposits and tar. From its MSDS, it looks like Clean Shot is a mixture of about 50-70% trans-1,2-dichloroethylene, which is a degreaser kind of like TCE ( Famously used by IBM, leading to a major groundwater cleanup), and PERC (dry cleaning); except DCE has much less toxicity and very good wetting characteristics for getting into all sorts of nooks and crannies. It is also a good solvent for glycol ethers (the cf20 The rest is a mixture of R134a and HFC-365mfc. Neat stuff. So the evaporator flipper plus the CF20 plus the Clean Shot look like quite a winning combination on paper too!
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Post by Travis on Oct 14, 2018 15:20:26 GMT
Grrr, so that is the stuff that’s stuck in my poor 27’s check valve.
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Post by coldspaces on Oct 14, 2018 17:35:05 GMT
Grrr, so that is the stuff that’s stuck in my poor 27’s check valve. Not necessarily, it could have a splinter! Found this in pan after the last flush. (the one I videoed) I was trimming tree limbs just before this with a chain saw so there is some chance it fell off of me but it dos not look freshly cut to me. Since the original windings were held in place with wood it may be from that.
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Post by Travis on Oct 14, 2018 17:59:00 GMT
That's too funny.
The stators will be coming to you this week! I know Garrett is excited.
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Post by ckfan on Oct 15, 2018 13:19:41 GMT
That rig you made is awesome!
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Post by coldspaces on Oct 20, 2018 3:54:01 GMT
Their back!! Looks like they made it back without any shipping damage, they had them packed in a plywood lined box. For now they are living in a CG that is off,keeping them where they won't get banged into. Been extremely busy fixing/replacing furnaces the last 7 days. Garrett and I spoke last week and even though I have used over $250 in coil flush (wholesale cost with tax, expect to pay more normally) so far I am still getting some real fine debris out of the coil. That's after soaking with CF20 and 7 Clean shot flushes so far. I plan to do at least 2 more flushes since we can't open these evaps up and clean them.
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Post by Travis on Oct 20, 2018 4:04:16 GMT
If those aren't the greatest pics, I don't know what is. I was thinking of the DR35 today as the Hotpoint we were playing with has one of the same evaporators.
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