Problem with vapochill classic gassed with r-290

[BB mods's]

I got my old clasic up and running with a new bd35f compressor..install was fine, all i did was add a 82" piece of .028 cap tube to it and put new foam on the suction line,gased ip up and turned it on..slowly added gas untill i got ico to form on the evap, then slowly added gas untill it shut the compressor down, let some out then started bleeding it out untill i got it down to -50 (was a slow drop below -35*c ) that was all good and i was happy, slap a 75w pelt on it and fired it up,let the evap drop to -35*c then turned the pelt on,allmost as soon as the pelt got it's 12v the evap's ice turned to water and ran off, then the evap temp rose to +45*c :confused: :confused: forgive me here but the stock r-134 a charged system was suposed to be able to handle 100w at sub 0 temp..and r-290 + better fan on the condin and adjusted cap was suposed to give it even more cooling power.soo.....what's going on with this thing????

[blinky]

its undercharged, add more propane while its under load from the pelt

[gkiing]

Yeah, definatly undercharged. Also your capillary may be too long, try 8' of 0.028".

[BB mods's]

I will readjust tomorrow and test again.this thing is destin to be wall art for sure :D

[i_like_penguins]

um 82" is less than 8'

[BB mods's]

8' = 96" and i feal that's to long for thit tiny compressor.Any more idea's?????

[gkiing]

Captube sizing should be independant of the compressor used; you size it for a heatload not for the compressor. The only difference is a higher power compressor will be able to run a lower temperature at the same heatload with the same captube. I was assuming that you were adding the length of captube to the original length.

[BB mods's]

So do i need to add more cap tube or take some away?????Im going to the shop right now to pull it down and change the evap.

[gkiing]

If you have 82" of 0.028 captube now, add 14 inches and charge it till the lowside is running 2-4" (-2 to -4 psi on the manifold gauge) with nothing on the evaporator and the suction line insulated. I attached a cap tube sizing chart for r290.

[BB mods's]

hmm how much total wattage do u think this bd35f can handle? (im a nub on small compressor's)

[BB mods's]

gona try for 210w @ 59" of .028 maby it will work out ok. :confused:

[Overklokk]

gona try for 210w @ 59" of .028 maby it will work out ok. :confused:

I think BD35 with r134a can handle 120-130w @ - 5c

with R404a it can handle about 180w @-5c (thats the speck on vapo XE)

[BB mods's]

Since i dont want to drive 2 hour's to get some 404a from a buddy what can i get on 290? i went with 58" tonight,did ok i guess, dident have any big time ice lost like b4 but i also dident get temp's eather, so tomorrow it's 51" time with 290 and if all fair's well ill do 51" with 404a later next week when i have to make the run to my buddy's house,i also fixed some of my problem,while i was redoing the evap i found that most of the low side line was closed up with silver >_< i redid the whole low side and got it flowing right,gased it up and made ice,shut it down and im letting it sit right now...tomorrow we test with 51"!!!!!!!!


BTW..that small pelt is all i have..what else can i use to load test it????

[BB mods's]

Ok this is weird.....regased the system but cant get a neg pressure on the low side now...it get's cold but not as cold as b4...wtf?

[gkiing]

With a longer capillary tube (51") you get a far larger capacity (~200W) but at a higher temperature. In my opinion having capacity is far better than low temps but no capacity. Having it run 0-5psi is o.k

[BB mods's]

got it to hold -35*c tonight...ill be testing it on a junker amd setup that's sealed from top to bottom in RTV :D amd's make awsome load test machines, over volt 1 and they makes a ton of wattage. :p:

[BB mods's]

Bad new's...i got 51" of cap tube in...as i was rebrazing the evap i realized that i was out of brazing rod's!!! and it will be wednesday b4 my pound of them get's here!!! :( Ill update as soon as i get every thing back up then ill test it on the axp rig.

[BB mods's]

Vapo classic is back up and cooling just fine, got started on my next single stager, i made the condincer by hand out of a larger one.

http://www.snt-systems.com/tommy/xtream/Phase.jpg

http://www.snt-systems.com/tommy/xtream/Phase2.jpg

[kayl]

http://www.xtremesystems.org/forums/attachment.php?attachmentid=22561


With a longer capillary tube (51") you get a far larger capacity (~200W) but at a higher temperature. In my opinion having capacity is far better than low temps but no capacity. Having it run 0-5psi is o.k

that compressor BD35 vapor chill classic is very similar to the matish compressors alot of ppl here at the forms seem to have.
how many Hp is the BD35?
with a full overclock -30c under load is good a good figure, well thats what i get. if use really short capillary line like have and as gkiig said low side 0-5PSIG is good.
i run mine about 6psig at load about 3c difference between idle and load temps.
i use 8' of 0.031". low side idle about 4psig, then under is creeps a little closer to 6psi at full load which makes sense.

also try laying the condenser flat so get better flow through the condenser.

[BB mods's]

i think i confused u a little :-/ the pic's that i posted are of a matsu:banana::banana::banana::banana:a compressor the bd35f is FAR smaller,and it doesent have near the hp of the matsu compressor.

[gkiing]

Hey kayl do you have any idea of the horsepower of those matsush|ta compressors? I've got a few laying around and was thinking of starting a co2 cascade.

[JSU]

1/3hp, 10.84cc displacment if my memory serves me correctly

[gkiing]

1/3hp, 10.84cc displacment if my memory serves me correctly

Awesome, way more power than I thought. I'm going to use one in the high stage (FN91Q11G) and a 1/4hp tecumseh AE1380A for the low stage.

[BB mods's]

I got a nother 1 of them Matsu's on the way..what should i do with it? single stage again? or maby a small 2 stage with 1 of the other compressor's i have...??