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How do I attach copper lines to an AC compressor?

PicoHydro on Tue January 10, 2012 12:46 PM User is offline

I'm using an auto AC compressor for a non-automotive application. (A heat pump). The balance of the system piping is copper lines. Does anyone have a suggestion how to adapt from copper tube and connect the AC compressor?

HECAT on Tue January 10, 2012 1:18 PM User is offline

I must assume from the question that you do not have what fits the compressor. The factory hose or fitting arrangement could be found from a donor car that uses the same compressor, or new replacement parts. Then you can use various threaded adapters and/or connectors; or by fabricating, welding, brazing, "sweating", flaring, or whatever is required to make the most approriate, reliable, leak free connection.

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PicoHydro on Tue January 10, 2012 5:54 PM User is offline

Thanks for the reply, HECAT!

The compressor is a Sanden TRSA12. It looks like it comes with a few different connection types. Would one style work better than another? Is there a particular hose set that would be easier to adapt to?

My cross-reference shows that the TRSA12 fits in:
2005 - 2007GMCEnvoy SLE
2005 - 2007GMCEnvoy SLT
2002 - 2004GMCEnvoy XL
2005 - 2006GMCEnvoy XL SLE
2005 - 2006GMCEnvoy XL SLT
2004GMCEnvoy XUV
2005GMCEnvoy XUV SLE
2005GMCEnvoy XUV SLT
2003 - 2004IsuzuAscender
2006IsuzuAscender
2005 - 2006IsuzuAscender LS
2005IsuzuAscender S
2007IsuzuAscender S
2002 - 2004OldsmobileBravada
2006 - 2007Saab9-7X 4.2I
2005Saab9-7X Linear
2004 - 2005BuickRainier
2006 - 2007BuickRainier CXL
2002 - 2004ChevroletTrailblazer
2002 - 2004ChevroletTrailblazer EXT
2005 - 2006ChevroletTrailblazer EXT LS
2005 - 2006ChevroletTrailblazer EXT LT
2005 - 2007ChevroletTrailblazer LS
2005 - 2007ChevroletTrailblazer LT
2002 - 2004GMCEnvoy

HECAT on Tue January 10, 2012 9:31 PM User is offline

You could buy any hose set to cut off the pad. You find pads by searching Docs Blocks. You are going to have to fabricate your own solution.

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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

FLUSHING TECHNICAL PAPER vs2.pdf 

Dougflas on Wed January 11, 2012 5:17 AM User is offline

Get a fitting from Docs Blocks as Hecat said. Get the steel version. Then use 45% silver solder with the proper white flux and braze the copper to steel.

NickD on Wed January 11, 2012 5:45 AM User is offline

Typically, HVAC compressors operate at a much higher pressure, have copper fittings, are direct driven, and have an oil sump where oil is not circulated throughout the system.

MVAC compressors, operate at a much lower pressure, rubber hose type fittings, can be made of aluminum, are belt driven that greatly reduces the efficiency, and circulate oil throughout the system, that also reduces the efficiency and will give you a calculation problem.

Would consider using an HVAC compressor for your application. Even not knowing what it is.

ice-n-tropics on Wed January 11, 2012 10:01 PM User is offline

There are only 2 basic TRSA12 configurations for GM but both have similar ports, just rotated on the comp housing. There are 2 mounting configurations for GM, one for 6 cyl and one for V8 application.
Chrysler electric vans had a semi hermetic 33cc scroll comp used as a heat pump with Ranco reversing valve because hp used less battery power than resistance heat.
hotrodac

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

PicoHydro on Thu January 12, 2012 7:42 PM User is offline

Thanks again for the helpful replies. I especially appreciate the specific instructions Dougflas.

NickD, I've been designing with your considerations in mind. The upper high side operating point is 200psi. I'll couple my power source directly to the compressor shaft - no pulley. I plan to use an oil separator, such as the Henry S-5185. Would you suggest another? I had hoped to use a TRSE09 with a built in oil separator, but it was too small. Could you suggest a scroll open drive HVAC compressor? A volume 150 - 200 cc would be helpful.

hodrodac: Do any of the TRSA12 models have CCW rotation? It seems that models 3450, 3452, 3454, 4910 have CW (right hand) rotation.

I looked at Docs Blocks - What block style mounts to which TRSA12 model?

Edited: Thu January 12, 2012 at 8:21 PM by PicoHydro

ice-n-tropics on Fri January 13, 2012 6:03 PM User is offline

CCW Nope
Temprite seperator best
hotrodac

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

PicoHydro on Wed February 08, 2012 8:25 PM User is offline

Thanks for the Temprite separator tip, hotrodac.

I didn't have much luck calling Docs Blocks - the sales lady said they had no technical staff to answer questions. I bought a TRSA12 and a hose set from a Chevy Trailblazer. The metal parts are aluminum. Can I make an effective flare connection to the aluminum tube on the hose set? The suction line is .75" OD, and the discharge is .61" OD.




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