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Is this your first Autocascade? Have you worked on Scientific refrigeration before? Do you have the manual? The flushing is extremely tricky on these. You have to use a recover machine capable of...

Your mind is anything but Mushy :D Name was close (Britt) and still working on the same stuff at the same place. Nothing much has changed accept the kids are taking more of my time (as it should be)...

Nice work Micheal. Glad to see your still working and sharing projects. Glad to here the new business venture is going well. Hope to see the Cryobug and Cryosprite in production sometime soon.

I agree. I keep my system purged with N2, the POE may only see the atmosphere for 5 minutes during the entire process. The last thing to be brazed in is the FD.

I may give this a try.

The OEM compressors are filled with their own oil. I have seen the setup they use to dehydrate it. Dont quote me but I believe they dehydrate it to 5-10ppm. Once the oil is...

POE oil is the worst thing to hit the refrigeration industry since the Montreal protocol. I have had more systems with POE in them die of mysterious causes than both other oils combined. If POE gets...

Methodology! Thanks Michael, Thats the word i was looking for!

Great work on the stacks.

A full sight glass only indicates that you have liquid up to the cap tube. It doesnt represent a full evap. By adding the additional pound of refrigerant, it increased the amount of refrigerant in...

Let me get to the shop tomorrow. I have national refrigerants number. They have a great refrigerant engineer there. He is very helpful and is very conversational with refrigerants. We had a great...

Thanks for the clarification Kevin. If you measure the evap Inlet and the evap out temp you will see if the evap has enough refrigerant or if its starving. Usually you will only see a Delta T of...

Have you checked here?
http://www.mesagas.com/Instrument%20Grade%20Pure%20Gases.htm

They are in Cali.

Kevin, It sounds like you are making good progress. I am having a little trouble following your descriptions though.



This line in particluar is giving me trouble. As a technician I usually...

2008 price national welders:
17lbs instrument grade +tank= $365
Item number O82542

Micheal,
Have you looked at R245FA yet? Its taken the place of r142B in some commercial units. They are getting much better results out of the units. Units that used to struggle to make -154 are now...

It will be interesting to see how the TXVs work on the system. I have found in the past when trying to run evaps in parallel, while using TXVs, it has been a challenge to get the system tuned. As one...

Pentane does not cause washing of the cylinder walls or piston. It will be a week or so before I am in the shop again, when i get back I will get the exact oil charge and pentane charge for you. It...

Pentane is still used in several cascade systems. Sanyo ULTs use 2oz in both stages. First stage refrigerant is 407d, second stage is suva 95. I dont have the charge particulars with me. I believe...

Buffer tank with pressure controlled inlet valve is pretty much standard in reducing and maintaining discharge pressures. It will also help with pull down and temp recovery should the final evap come...

Micheal,
EPA has approved some hydrocarbons for residential and commercial use.

http://epa.gov/ozone/snap/download/SNAP%20HC%20unofficial%20version%2012-9-11.pdf

Brazing the cap tube is a PITA. I have ended up brazing one end onto the suction line, then puling it tight like I want. Then i use soft solder and flux for the rest of the connection.

On the...

Glad to see you guys doing this and posting about it. It is making me scratch my head and google some of the stuff. I am not sure I understand your diagram in the beginning but still studying it....

RussC, Thanks for the reply. This piece of equipment is for a researcher, the replacement is $14K. I was trying to give it a shot to see what could be done. I did manage to find a collegue that could...

Ok guys I need help from yall this time. I have a obseleted piece of equipment that I am trying to get running. I think I have traced it back to the actual programming. The Microprocessor is an...

Add a dump solenoid onto the high side of the second. Dump it into an expansion tank. Let the tank bleed back into the suction side of the second through a cap tube. Us an adjustable pressure switch...