Another Vacuum pump enquiry

[johann]

Hi, this is my first post here on the forums!

Im busy getting together the tools for building a phase change unit and after researching on these forums have got everything pretty much sorted except for the vacuum pump.

I want to get a proper one as Im not one for getting frustrated with the wrong tools or tools that dont work propperly.

The one I found that is reasonably cheap but looks like quality is the Javac one with these specs:

CC 31 Vacuum Pump
The JAVAC CC two stage 1.3 cubic foot/minute oil sealed rotary vane vacuum pump is basic equipment to evacuate domestic, automotive and light commercial refrigeration and air conditioning equipment. Suitable for use with R134a, R22 and compatible refrigerants.

SPECIFICATION :
Voltage : .220/240 V 50 Hz
Free air displacement: 36 litres/minute (1.3 cubic feet/minute)
Ultimate vacuum : 0.025 mbar
Motor : 1/4 HP
Motor speed : 1440 revs per minute
Oil capacity :: 350 ml
Dimensions : 330 mm x 143 mm x 255 mm
Net weight : 9.8 kg

Ebay Link (http://cgi.ebay.co.uk/Air-conditioning-vacuum-Pump-By-Javac-Fast-Dellivery_W0QQitemZ5997282870QQcategoryZ20711QQrdZ 1QQcmdZViewItem)

This one seems to be of much bigger capacity, I found the datasheet and it says it pulls a vacuum of 5x10 to the power of -4 milibar (unsure as to how to convert to microns)

Ebay link (http://cgi.ebay.co.uk/Javac-DD150-Vacuum-Pump_W0QQitemZ7543225180QQcategoryZ78222QQrdZ1QQcm dZViewItem)

Any thoughts will be appreciated. Although the latter might be more powerfull it is second hand (Not ot fond of second hand) but its cheaper. If the CC30 in the first link will do the job then I might just as well go for that

Thanks
Johann

[wdrzal]

I don't like those javac pumps, for that much you can get a robinair,ritchie yellow jacket, jb industries and there are others

[johann]

The only one you mentioned that I see now and then on Ebay is Robinair, I see they pull 20 micron vacuums mostly, this is decent right?

[jinu117]

more so than I think. Guys, how far do you really vacuum? Isn't like oil's surface tension lose around 200 micron anyway?

[johann]

I don't like those javac pumps, for that much you can get a robinair,ritchie yellow jacket, jb industries and there are others

wdrzal, have you owned/used a javac pump? Anyone else have had any experience with javac pumps?

[johann]

one problem its 220v stove/dryer plug to operate not a 110v common wallplug

Im in the UK, we have 220v wallplugs all round

[johann]

I found a nice pump, the inlet and outlet is KF25 flange fittings, will that be the right fittings?

[chilly1]

the second pump is the better one These can be services and rebuit there are replacable valves and other internal parts that are cheap.. In the stated a sinilar pmp is 450.00 USD
The first pump in teh Us sells for 150.00 USD

I would get teh second on (Used) and change the oil and test with a micron guage to see what it pulls if it wont pull 100 microns withthe guage attached to teh pump rebuild it.. 30,00 what is that in USd like 45?? No t bad.. worst cast it cost you 100 to rebuild it..and you got a 450.00 pump...

[johann]

OK, i bought this pump as chilly1 reccomended. I will see how it runs and service it if needed. Is there any way of testing its vacuum without a vacuum gauge to see if its sufficient?

My new pump link (http://cgi.ebay.co.uk/Javac-DD150-Vacuum-Pump_W0QQitemZ7543225180QQcategoryZ78222QQrdZ1QQcm dZViewItem)

OK now next thing is a torch, I have it narrowed to two options, they both will cost me approx £50

1) Mapp torch from my local hardware store (Nice and compact)
2) Brazing kit (http://www.proopsbrothers.com/acatalog/Online_Catalogue_Brazing___SilverSoldering_28.html )

which one would you think is the better option?