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02-05-2013, 08:12 AM #14Professional Member
- Join Date
- Aug 2012
- Gainesville, FL
R-22 Alteratives Pro's and Con any help
02-07-2013, 03:34 AM #15
mixing two will not work,as both the refrigerants are having different boiling point,critical point etc. Compressor oil is also different.As the POE oil used in R410A systems is very sensitive to moisture,thats why it is recommended to achieve atleast 300 micron vaccumm level in 410A system.
Still wondering how system will behave at high ambient conditions?
02-07-2013, 02:29 PM #16Regular Guest
- Join Date
- Apr 2008
I can see we are still at the starting point and I'm getting same stuff from other Vendors out there and also from supply house's anyone has a Dif opnion.
The following is a little bit of information concerning refrigerant replacement for R-22.
There are a number of so called drop in replacements for R-22 on the market.
The following is a sample list: Dupont M099 which is actually R-438A, ICOR NU22 which is actually R-417A and ICOR NU22B which is R-422B.
You also have R-422A,R-422C, and R-422D.
The upside to retrofitting is: Cost of replacement refrigerants are presently about ½ the cost of R-22. Retrofitting may help put off replacement of equipment until the customer’s budget will allow.
The downside to retrofitting: All replacement refrigerants at present experience a capacity loss which may be 7 to 30 % if installed correctly.
It is possible that leaks will occur at elastomeric seals after replacement. These seal include Schrader cores, solenoid valves , ball valves, receiver gaskets ,etc.
Leaks are not a given but the older the system the greater the chance for leaks.
Systems that have present oil return problems such as long line length or oil logging in the evaporator due to air flow or ambient operating conditions may have to remove 10 to 25% of the existing mineral oil and replace the removed oil with the same amount of polyol ester oil. If this needs to be done extreme care should be taken when installing the polyol ester oil as it is extremely hygroscopic.
There is no true drop In refrigerant replacement on the market that meets the exact design of R-22. All replacements have potential issues even though the customer might find these issues are slight.
The contractor must replace driers and install driers that are compatible with the replacement being used.
The newer the existing system is the less chance of problems and more cost effective retrofitting will be as R-22 will continue to rise.
The older the system the greater the chance there will be a problem such as leaks , oil return, etc.
The refrigerant replacements are HFC which depending on the one used is a Near Azeotrope and or Zeotrope which must be charged in a liquid form.
After a system is put into service it may require adjustments to expansion valve to maintain proper superheat .
04-19-2013, 05:03 PM #17New Guest
- Join Date
- Aug 2011
04-19-2013, 08:03 PM #18
04-19-2013, 10:10 PM #19
407c is a great replacement for R22. The problem is with the oil difference. I have only used 407c when changing the compressor. That way I can dump out the mineral oil in the compressor and replace it with the appropriate POE oil for 407c.