Deep Purple cascade

Hi

That had been planned as a strong 2 stager with nice purple case. With bypass valve. I use very strong 230V rotaries, two plate HXes (one as a SLHX) and 6.0kW condensor with BIG and strong 350mm fan. It's mine second try with 20+ kBTU compressors in 2 stager . Is it worth to use such strong compressors ..I'm not sure now.

But ...it works

.

Specs :

compressors: LG GP280 on 1st stage, plus Siam SCI NN33VAAMT on 2nd stage
evap: steeper 54mm
XV: ALCO TI-HW / captube 0.9 mm
HX: 2x plate HX , 20 plates each, one as a SLHX on 2nd stage
condenser: 6.0 Kw, alu-cu, cooled by FENGDA FDA350E4/G 350mm 230V fan
refrigerants : R507/R1150
oilseparator : Shine Year automatic
safety : 2x Danfoss KP17WB cut-offs (one to each stage), Torrecilla 2.4l expansion tank
case : Laser cutted and powder coated case (violet , RAL 4007) 69 x 69 x 54 cm, wheels
others: Bypass valve - Castel handvalve, 4*REFCO panel gauges repainted on black, ANACONDA shocks absorbers on 1st and 2nd stages suction lines, Dixell XR20CX controller (turn on 2nd stage automatically when 1st stage is enought cold), big PID controller as a temperature display on 2nd stage, clear paint coated pipes, 350mm EBM fan on back wall, cork sound insulation, aditional 230V socket on back wall of cascade - to plug PC there.

During building I got some problems ..compressors died (I've got used compressors for this project), also one brand new 350mm EBM fan was bad and stopped suddenly causing 25+ bara pressure in 1st stage :eek:. After that I decided to mount cut-off also for 1st stage and change fan for very powerful FENGDA fan.

Frame under baseplate MAG welded by me ...then powdercoated. Those compressors are VERY heavy and baseplate can easily bend witout that :yepp:.

Refco gauges were painted black ..owner want to have possible all outside adds in black color so I repaint also gauges, because I can't buy any black

One evening friends came to mine workshop :

: (I'm not smoking

First time was CPEV on 2nd stage ...but it works completelly bad (regulation wasn't work almost at all :shakes:) so later I replaced it with 0.9mm captube.

Second plate HX as a SLHX in 2nd stage...

One compressor worked bad, take way over 20A from socket ...crap. I changed it to another which works fine.

New high flow 350mm fan , to replace bad EBM one :shakes:.

Some numbers without load...

Electric completed . Power to 230V socket on back wall of cascade is cut off when any two of safety devices cut any stage off. So when anything with cascade goes wrong , power to PC which will be connected to back wall socket will be also turned off.