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Thread: Carrier Conversions
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21-07-2006, 08:11 PM #1
Carrier Conversions
I've been asked to convert 3 x 70kw Carrier air cooled DX condensing units from R22 in preparation for the phase out of R22.
The units are single stage 6 cylinder semi - hermetic compressors (76A flc) with no unloaders. They appear to be recon compressors and operating quite satisfactorily.
Which gas should I choose?
It's an air conditioning application presently evaporating at 5C.
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21-07-2006, 11:11 PM #2
Re: Carrier Conversions
A little bit here Frank by someone else regarding a chiller gas change might be of interest.
http://www.modbs.co.uk/news/fullstor...ler_life_.html
plus this item from earlier...
http://www.refrigeration-engineer.co...hp/t-1727.htmlBrian - Newton Abbot, Devon, UK
Retired March 2015
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22-07-2006, 06:54 AM #3
Re: Carrier Conversions
Thanks Brian - I was considering R59 but I've heard bad reports of oil recovery.
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22-07-2006, 09:34 AM #4
Re: Carrier Conversions
R407c and you can keep TEV.
Renato
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22-07-2006, 11:32 AM #5
Re: Carrier Conversions
Originally Posted by Renato RR
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25-08-2006, 03:01 PM #6
Re: Carrier Conversions
Well you will nedd change it 4-5 times before becomes ok.Cut off all sifons and empty old oil from traps.
Renato
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26-08-2006, 12:00 PM #7
Re: Carrier Conversions
Originally Posted by frank
When the oil is flushed, then it is time to change to the new refrigerant, probably R407c, even though I don't like it, it is probably the only alternative atthe moment.
Hope this helps.
Kind Regards AndyIf you can't fix it leave it that no one else will:rolleyes:
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26-08-2006, 03:38 PM #8
Re: Carrier Conversions
Hi,
I used r407c for replacement of r22. No problem yet.
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07-09-2006, 12:34 PM #9
Re: Carrier Conversions
Conversion from R22 to a HFC such as R407c is frought with problems, and could be a very costly exercise.
Du Pont now offer the Isceon range and we have found Isceon 59 (R417a) excellent as a 'Drop In for R22 on DX systems.
This gas is not cheap and the recommendations by DU Pont to thoroughly leak test must be followed.
You may also have to adjust the TEVv and should use tables for R417a to check superheat & subcooling levels. Sometimes the cage / orifice size may need to be increased.
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07-09-2006, 09:23 PM #10
Re: Carrier Conversions
After studying various reports I chose to convert with R417a. One unit has been sucessfully converted with excellant results but I'm waiting on Carrier to provide further gaskets etc (due in from the States soon I'm told) before I can proceed with the other 2.
http://www.eurocooling.com/articlerhodia.htm
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