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Thread: mitsi R22 to 410a systems..
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03-02-2004, 12:03 PM #1
mitsi R22 to 410a systems..
hi guy's
anyone round here fitted one of those new mitsi units which allows you to use the existing R22 pipework on their new 410a unit
as it has a dipswitch which 'cleans' the pipes out for 2 hours prior to running in 'normal'
cheers
richard
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03-02-2004, 03:36 PM #2
hi richard,
never did such job but from what I know you need different type of copper pipes fore R410.
I think you can find more at: http://www.410a.com/
chemi
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03-02-2004, 04:46 PM #3
chemi
these mitsi units can use te old copper by having a scavenging cycle which when you first install it, it runs for 2 hours 'clening' the old pipework out of oil and contaminants
http://www.bsee.co.uk/news/fullstory...r%92s_gem.html
http://www.mitsubishi-aircon.co.uk/p...cification.doc
cheers
richard
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03-02-2004, 07:33 PM #4
Pressures on the field piping are not that much higher then you have now with R22. Both are low pressure lines between in- and outdoor. But the thickness high pressure pipes in the outdoor units needs to be more then with R22.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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03-02-2004, 08:34 PM #5
so, if I'm wrong, why then, are R-410a compressors have a thicker shell?
I would use the thicker pipes even just to be on the safe side.
You might get another summer like last year.
you will need a ladder to see where the high pressure gone up to.
chemiLast edited by chemi-cool; 03-02-2004 at 08:40 PM.
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03-02-2004, 10:02 PM #6
Mitsubishi recommends to use normal copper lines.
Also according to PED legislations, this is not needed.
Inside the compressor shell is indeed a higher pressure then we usual see but because expansion is in the outdoor unit (thicker tubes are used for discharge lines installed in the factory), therefore at the outlet of the two service ports you have twice a low pressure: 'low pressure not evaporated yet liquid' and suction gasses.
Pressure = +/- 27 bar for 45°C condensing (30 bar for 50°C), low pressure of +/- 7 bar for tv =0°C.
We needed another set of manifolds for these. Connections are made different to avoid accidents.Last edited by Peter_1; 03-02-2004 at 10:10 PM.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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04-02-2004, 06:54 AM #7
I have heard our American friends saying that they have been to R410a training sessions where it has been stated that you can use the same copper thicknesses as R22.
However, in Australia the tubing manufacturers have been running a "Think Pink" campaign where ACR copper for R410a has pink plastic caps as opposed to the normal yellow plastic caps.
I assume that standards and conditions vary from country to country, so there will be no universal answer to this question.Mark Baker
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05-02-2004, 08:03 PM #8
This link is quite interesting and I think it answers most of the questions here. http://www.ccbda.org/pdfs/28e.pdf
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25-01-2011, 09:40 PM #9
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25-01-2011, 09:45 PM #10
Re: mitsi R22 to 410a systems..
ac king
Check the dates !!!
That thread is 7 years old.
WEY HEY!!
Cheers
StuTool's ? check ! Condom's ? check !
If you can't fix it , f*ck it !!!
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25-01-2011, 09:50 PM #11
Re: mitsi R22 to 410a systems..
did 5 power inverters in peterborough using the original r22 pipework. re do the flares,adjust 1 dip switch if liq line is 1/2 pressure test to 40 bar,evacuate as normal then open service valves and add any additional charge then run the self clean mode for upto 2 hrs. then flick the dip switch and off u go.
mitsi do state that the original systems havent had compressor failure and it is possible to pump down. check with mitsi theyres a procedure sheet.Last edited by install monkey; 25-01-2011 at 09:54 PM. Reason: old post
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26-01-2011, 09:38 AM #12
Re: mitsi R22 to 410a systems..
All Manufactures make these systems now a days but they do specify you flush the pipe work then use Ofn and then fit dryer to each system.
Flushing kit cost about £100.00
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27-01-2011, 07:22 PM #13
Re: mitsi R22 to 410a systems..
Over the counter pipe sizes up to 7/8 are okay for pressures of up to 43 bar in the annealed copper condition, ie very soft and maleable. You need to ensure that you switch to lower gauges for 1 1/8 upwards. I researched this for two years so I can promise you it is correct. Contact me if you want the details. Never known a Mitsi replace to go wrong.
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27-01-2011, 09:28 PM #14
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28-01-2011, 10:54 PM #15
Re: mitsi R22 to 410a systems..
Cheers for the polite reply Stufus the Dufus.
I will remember to make sure I check everything in future especially the dates. I will also try not to be helpful and post insulting posts like yours instead.
This site is supposed to be for trading knowledge and helping each other. If you want to post childish nonsense I suggest you ressurect fridgeman.com
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