my 1st evocade <see what i did there lol

[EvoCarlos]

hello and welcome
well i been off work for a week and need'd something to do (i was bored and build this)

parts

airwell ac unit may 70 ebay £50
random roto from posty (thanks dude)
platex hx again (thanks posty)
ranco hpco eaby £2
1/4" solanoid valve (bes) £16
1/2" flex (bes) £9.50
evap Curtsey of bazx thanks man :p
co2+ reg £30
2nd stage hi side mano with 1/8 npt - 1/4"flare £8 RPW
armaflex (bes) £4


some images and a step by step

the base


this is a thru the wall ac unit so its sort of a casset type
here it is with the unit out the case and with the lid off


comp


elecs


unit on the phaze bench ready for destrution


heres some thing you dont see posted much the proper way to remove gas
line tap

fitted

the r407c was bottled for futer use
hole left by line tap


gutted

more gutted

shrade fitted and gassed up with R507 for testing

[EvoCarlos]

water chiller any one lol

degassed and removed the evap and fitted the platex hx


-38 to hx

bored gutted even more

new f/d and hi side service port

new pipe lay out (under vac)

gassed with r507 again and cap tube lenth thanks to peter (piotres) thanks matey

location location location lol

comp mounts


big ass condencer was split for 2nd stage dsh

and piped up what a pain in the ass

[EvoCarlos]

hot gas bypass


2nd stage cap tube 3m but i think its to long and some pipe work of 2nd stage hi side

pressure test and just waiting on evap

cooking evap for breckfast lol


out with the old and in with the new

done and fitted

2nd stage vac and gassed with 200psig of co2
the first frost on evap

some r507 in with the co2

some case modding

hpco bolted down and other part mounted

side veiw

lid back on and time for some tuneing need to get a cpu on it for load testing and tuneing but thats later


ive had some truble with the 2nd stage with it fluctuating on the low side and droping in temp i also think the 1st stage is over charged but i will see going to recover the gasses and vac it down and start again with the charging any tip and advice from the guys that build cascades will be greatly aprecated
thanks for looking carl....

[sjg0]

Sweet! Very intuitive!

CO2 + Regulator = 30 pounds(~$60)? Could you post a pic of that setup please?

[EvoCarlos]

Sweet! Very intuitive!

CO2 + Regulator = 30 pounds(~$60)? Could you post a pic of that setup please?

hey yeah the co2 was an old pub bottle that i had filled by a friend
the reg was cheap from a local guy new in the box
heres the reg


the bottle is in the images above at the end of the table you can just make it out

[yngndrw]

I've been wondering about them Airwell airconditioning units - Did you get the 7000BTU version ?

Good job upto now.

[EvoCarlos]

I've been wondering about them Airwell airconditioning units - Did you get the 7000BTU version ?

Good job upto now.

yep thats the one it the may 70 there is a may 90 but thats £100 and its not really that diffrent from the may 70

oh and thanks still got loads to do before it ready

[teyber]

very nice

id love to see ethylene in this. but i wouldn't recommend this until you get a very good vacuuming procedure and vacuum pump. not gunna start a flame thread here tho :P

do you work incredibly fast or do you take lots of pictures and post them at once?

nice

[EvoCarlos]

very nice

id love to see ethylene in this. but i wouldn't recommend this until you get a very good vacuuming procedure and vacuum pump. not gunna start a flame thread here tho :P

do you work incredibly fast or do you take lots of pictures and post them at once?

nice

i love to see it on r23 or ethylene to but i have nether of them and know no one that has any i can try in it

teyber dont spose you got one of your temprite 900 spaire you could send to me in the uk?? got oil logging on the snd stage

oh and the vac process is fine 2 lbp comps in tandum and purged with co2 between vac's they pull down to -29 on the gages and atm a vac pump is far to much cash for me to shell out i got to use what i got

yeah i took all the images and built the unit then posted it all @ once had to post 3 time to get all the image in lol

[tiborrr]

I don't think you have as much oil clogging problems as you do have dry ice forming problems. More R507, less CO2, but that will get your temperatures higher

Good job nontheless, small and compact cascade this is!

[EvoCarlos]

I don't think you have as much oil clogging problems as you do have dry ice forming problems. More R507, less CO2, but that will get your temperatures higher

Good job nontheless, small and compact cascade this is!

no dry ice yet it dont pull full vac it just bounce the gage on the low side with no oil sep i bet its pushing the oil in to the hi side and then it goes to the cap and dips the gage then back up when its clear dry ice would be just all vac all the time more 507 will aid the flow of oil greatlly but like you said temp will be cack

[EvoCarlos]

update
ive added an manual oil sep to the 2nd stage and its working alot better
no more bouncing of the the low side gages but i cant get past -70c with co2i try'd it with 250psig of just co2 and it worked down to about -60c then it hit dry ice so i add'd some r407c lol i ment to add 507 but picked up the wrong bottle i got it past -70c but then after some time i had ice all round the bottom of the compressor
not sure what to do now lol need a better gas 1st off
ive also done a bit more lagging to the system

i have a problem with my wiring cant find it tho i had a small shock from the unit last night may be its cause it has a 2 pin euro plug on it going to swap it out for the standard 3 pin jobby also the control box was out of the case and i dont think it was earth'd properlly
did not want that to happen need to put my earth leakage device so i dont get any more shocks

[firerx]

Nice work , Evo

[EvoCarlos]

bit more progress with the cascade i'm working on the controller for this beast now and trying to put all the bits into the orignal ac pannel some images you see what i mean

stock ac front


parts and clear pannel


how it shold look when its done just need to cut out the mano hole

[Postal Dude]

dude that looks great. Hows the second stage doing? Is it playing nice yet?

[EvoCarlos]

dude that looks great. Hows the second stage doing? Is it playing nice yet?

thanks

the 2nd stage is working alot better now i have fitted the oil sep but temp is only -70c but it is only co2 i'm trying to find the right gas atm("" rembers to steal r290 from dad's 47kg bottle)
im making a few enquireies the unit has been off for 3 days and i have been watching the presures just to make sure there is no leak's,
i.ve got loads to do but im busy @ work so aint had much time to work on it roll on friday then i will do more i may even get the main case back on
need to send some pm's to nice people who could help me lol
and then get a cpu on it and see if its any good

[Postal Dude]

Aw your holiday finally came to an end then?

Im in talks at getting an Evap that will be capable of holding some sort of load lol.

Hope you can get it to hold a decent load on your quad.

[EvoCarlos]

right i done a bit more to the cascade had to strip it down to do some mods on the 1st stage and i must say i am absoultlly useless @ ac wiring think i figured it out tho now lol had trouble with the temp probe on the controller it would not go below -26 even tho the k-type in the same place was @ -40
also the 1st was very very over charged as i was getting ice on the compressor and it was running cold

so things i have done tonight
1-rapped the cap tube arond the suction line for subcooling
2-wired up lights/switchs/compressors/controller tested
3-fitted new k-type and moddified the controller probe for 2nd stage swith on
4-exstended low side service port on 1st stage as had some trouble with the shraders frezzing up not nice (its cold by the way)
5-bolted down the 2nd compressor properly

pic's

red light - over pressure warning
blue light - 2nd stage on
green light - 1st stage on
amber light - hot gas bypass on
green switch lit - mains power on
amber switch lit - hot gas bypass on


need to make the oil sep smaller or get auto one


1st stage temps and pressures after moddifcation
hx is now hovering between -51c to -48c it was @ -40c ish so some improvement


with co2/r290 in the 2nd stage the highest i saw was -78c for about 3/10 of a second after about 20mins it drops to about the -70c mark and sits there

i just want to get it all built now and get a cpu on it
its so much ball ake haveing to backpedal @ this stage i'll get there in the end

carl..

[EvoCarlos]

bit more progress and some more images

ohhhhh -81c

i think ive over done it with the armaflex on the suction line lol

@teyber do you mean like this?

shrink tube came today and i managed to get 3 layers of 13mm @ the evap lol

my mounting device and lagging its huge

damn load testers a bad whan they got armaflex on them


put mine on the cascade tonight @200w lol it held for about 15mins @ -60c with co2 /r290 in the 2nd stage then i had to hit the hot gas
bypass to test it then it went all down hill from there and then came the smoke from the heatloader it was was way to hot for the evap that
was @ -13c from it not recovering from the hot gas bit lol
still playing and testing
more progress soon
thanks for looking
carl...

[teyber]

yes exactly what i ment!

looks great man! great temps at load for the first load test!

cheers

[EvoCarlos]

right the cascade is @ a full stand still

as of wedsnesday my employer has put us on a 3 day week so now i have no money for the r1150 i was going to get or the vac pump
"puts his head in hands and crys like a little girl endlessly" lol
it looks like the cascade will never get to the stage i wanted it (well it will only be co2 cascade) and thats pants was hoping for -100c but looks like -70c will have to do
i will get the case back on and finnish up the install and try the q6600 on it but i doubt it will hold

carl..

[Lu523]

Don't give up on it. So far it is looking very good.

[EvoCarlos]

working to make the cascade betterrrr soon
thanks to teyber for the floated oil sep thats going to make the 1st big diffrence
i'll up date as soon as ive got some bits and done the work

[EvoCarlos]

right so a bit of an update i think i am now a member of the -100c club
its been a long time getting here but im here
most of the recent updates are over on benchtec
here --->> http://www.benchtec.co.uk/forums/showthread.php?t=2481

[runmc]

very nice - welcome to the club