I've been pretty busy these days, part of why I just haven't been posting much. This is why...
It's much better than my first one, though the compressors are a little smaller, the results are consistent, and there's no start issues on these. Gasses are R290/402a about 30% 290 on the High stage, and R290/R23 for the Low stage. Just a little R290 on the Low, and it's smoothed things out nicely. I charged to about 10psi with 290, then R23 from there.
Right, used my MP14FB 1/2HP compressor for the High stage, changed the oil to mineral. Got the higher viscosity stuff for it cos the compressor tends to run a little hot. GS4 I think? GS3 is standard. Well whatever it is, it ends in 3 but the viscosity was a little higher on this mineral oil.
Used a new/old stock FR10A R12 1/3HP compressor for the Low stage. not a big compressor, but decent. Worked well, and it's got a super tiny starter on the side that's just great. No start issues at all. I'd never seen one, and I hope it's the way I'm supposed to hook it up, but I tried changing to a standard coil and start cap setup on the FR7.5A I have as well, and it wouldn't work right with it. Went back to this little starter thing and it was perfect. Who knows. I should take a piccy of it, but my cam is pretty bad so it would just be fuzzy anyway.
This is a full captube kit. 5.5' of .031" cap for the High stage, and 7.2' of .031" cap for the Low. The HX is a coil in coil I put together. I wasn't sure about it cos I didn't have any 5/8" so I used 1/2" and 1/4". About 11' long coiled up. I really wasn't sure if it could be long enough, or would be decent for evaporation, but thought I'd try it out. I wanted to save the DII coax for the Auto, if my supplier ever gets the last couple of bits I need into stock. Anyway, the results speak for themselves on that one.
Yes that's a Tagan 'silent' PSU box lol I prewrapped the HX in armaflex tape, then into the box and expanding foam did the rest. Sure expanded the box though.
Where the line comes from the bottom of the HX for the Low stage, there's a little bend down, that's the filter/dryer, just a bullet type. Was perfect as it takes the captube right to where the 3way is for the oil return, and the flexi attached, so was straight on to wrapping the captube.
That's a 15cm fan, loud but effective. I tried a 12cm but just didn't do it. Small desuperheater just in front of the fan as well. Tight fit, but I was trying to make it somewhat compact. Henry oil sep, float type. Little hand-grenade for the filter/dryer on the low stage, was a little higher capacity than the copper bullets. Had a little 'accident' with the expanding foam, and had to scoop some out from the desuperheater. My hands are a mess lol but got most of it off, and just a little messy spot.
I think that desuperheat coil will help a little on the discharge on the Low stage, as it did get a little warmer after a longer time of running. I'm going to build a box around it, and put a matching fan on the exhaust at the back, so the airflow on that coil will do a little, and every little counts.
Just a back view, shows a little of the pipwork, though it's hard to see it well with the insulation. The High stage suction is from the left on this view, over the top, then down and loops up to the compressor. I was hoping that long run would help with flooding and it did a decent job, though really if I'd have had an accumulator or even some 7/8" reducers to make one I would. I might still, and if I do, I'll be using 90% 402a when it's recharged, but I haven't decided yet.
The Low stage suction is down under that desuperheat coil on the little compressor, along to the other side and up to the 3 way for the oil return. The size of that run ended up being perfect. When I charged that one, I set it to just barly frost to the compressor, and the frost hardly moved. After insulation tight to the compressor, I could feel it was a bit cold at the compressor but no frost, and under load it was still just a little cold there, though not as cold, so the charge, and the setup on the pipework, was ideal.
Cont.
It's much better than my first one, though the compressors are a little smaller, the results are consistent, and there's no start issues on these. Gasses are R290/402a about 30% 290 on the High stage, and R290/R23 for the Low stage. Just a little R290 on the Low, and it's smoothed things out nicely. I charged to about 10psi with 290, then R23 from there.
Right, used my MP14FB 1/2HP compressor for the High stage, changed the oil to mineral. Got the higher viscosity stuff for it cos the compressor tends to run a little hot. GS4 I think? GS3 is standard. Well whatever it is, it ends in 3 but the viscosity was a little higher on this mineral oil.
Used a new/old stock FR10A R12 1/3HP compressor for the Low stage. not a big compressor, but decent. Worked well, and it's got a super tiny starter on the side that's just great. No start issues at all. I'd never seen one, and I hope it's the way I'm supposed to hook it up, but I tried changing to a standard coil and start cap setup on the FR7.5A I have as well, and it wouldn't work right with it. Went back to this little starter thing and it was perfect. Who knows. I should take a piccy of it, but my cam is pretty bad so it would just be fuzzy anyway.
This is a full captube kit. 5.5' of .031" cap for the High stage, and 7.2' of .031" cap for the Low. The HX is a coil in coil I put together. I wasn't sure about it cos I didn't have any 5/8" so I used 1/2" and 1/4". About 11' long coiled up. I really wasn't sure if it could be long enough, or would be decent for evaporation, but thought I'd try it out. I wanted to save the DII coax for the Auto, if my supplier ever gets the last couple of bits I need into stock. Anyway, the results speak for themselves on that one.
Yes that's a Tagan 'silent' PSU box lol I prewrapped the HX in armaflex tape, then into the box and expanding foam did the rest. Sure expanded the box though.
Where the line comes from the bottom of the HX for the Low stage, there's a little bend down, that's the filter/dryer, just a bullet type. Was perfect as it takes the captube right to where the 3way is for the oil return, and the flexi attached, so was straight on to wrapping the captube.
That's a 15cm fan, loud but effective. I tried a 12cm but just didn't do it. Small desuperheater just in front of the fan as well. Tight fit, but I was trying to make it somewhat compact. Henry oil sep, float type. Little hand-grenade for the filter/dryer on the low stage, was a little higher capacity than the copper bullets. Had a little 'accident' with the expanding foam, and had to scoop some out from the desuperheater. My hands are a mess lol but got most of it off, and just a little messy spot.
I think that desuperheat coil will help a little on the discharge on the Low stage, as it did get a little warmer after a longer time of running. I'm going to build a box around it, and put a matching fan on the exhaust at the back, so the airflow on that coil will do a little, and every little counts.
Just a back view, shows a little of the pipwork, though it's hard to see it well with the insulation. The High stage suction is from the left on this view, over the top, then down and loops up to the compressor. I was hoping that long run would help with flooding and it did a decent job, though really if I'd have had an accumulator or even some 7/8" reducers to make one I would. I might still, and if I do, I'll be using 90% 402a when it's recharged, but I haven't decided yet.
The Low stage suction is down under that desuperheat coil on the little compressor, along to the other side and up to the 3 way for the oil return. The size of that run ended up being perfect. When I charged that one, I set it to just barly frost to the compressor, and the frost hardly moved. After insulation tight to the compressor, I could feel it was a bit cold at the compressor but no frost, and under load it was still just a little cold there, though not as cold, so the charge, and the setup on the pipework, was ideal.
Cont.
I can't wait to see yours, it's probably gonna be alot prettier than mine 
was sad to see it die.
