3-stager unit "Grosse Bertha"

[before]

This project started few months ago. My aim was to turn my late 2-stager to a 3-stager.

Specifications:

1st stage
LG NP407P (25000Btu/h)
AC Condenser + Fan
Copper filter dryer
Captube .8mm (1.9m)
HX 14 plates
R404a

2nd stage
Matsuchita (sic) 2K32 (19,000Btu/h)
Manual Oil separator
REFCO manometer for HSP
Expansion tank
Desuperheater (huge Condenser split into 2 parts, one for 2nd stage and one for 3rd stage)
Johnson Controls Pressostat
2 Copper filter dryers (one before and another after 1st stage HX)
Captube .8mm (2.05m)
Coaxial HX
R1150 or R290/R50

3rd stage
Sanyo C-RV167H11AB (10,000Btu/h)
ShineYear Oil separator
REFCO manometer for HSP
Expansion tank
Desuperheater (huge Condenser split into 2 parts, one for 2nd stage and one for 3rd stage)
Johnson Controls Pressostat
Filter dryer
Captube .8mm (2.55m) passing into the succion line
Pgeo's "Marguerite" evaporator
R14/R290 or R14/R290/R50

I'd like to thx my friend Luigi for all he has done helping me for this project. Also, Xialis lent me a helpful hand...

Some results

1st Stage R404a @-46C
2nd Stage R1150 @-103C too cold IMO
3rd Stage R14/R290 @-130C unloaded

Cold-bugged X6800 at 5.2GHz @1.8v



1st Stage R404a @-41C
2nd Stage R290/R50 @-75C too "hot" IMO
3rd Stage R14/R290/R50 @-137C unloaded



Some pics: more to come





I'm currently waiting for the 23400Btu/h compressor in order to replace 1st stage compressor and finish the cascade.