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Retrofitting large split system
The rising cost of R22 has got some of our customers ready to start replacing there 17 Year old units. The first unit they want replaced is a 20 Ton carrier split system. From my experiences in the past I can make the existing evaporator work with 410 with a loss of SEER rating. And the lower service area of the existing evaporator is also a concern to me. I am all about doing things right and I don't feel comfortable with this route. I just thought I would see what you guys were doing out there with these retrofits. I have a lot more chillers out there than split systems I was wondering if they did make a R134 20 ton split that would work with a 10 SEER evaporator. If it were my unit I would just put a drop in replacement refrigerant in the system and I may suggest that to the owner if the cost of this gets too great. The air handler is located above a suspended ceiling in a restaurant. And evaporator replacement is going to run close to 10,000. Any suggestions would be greatly appreciated.
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I would look at POE and 407C.
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2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
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The best solution I have seen recently is a retrofit program from Samsung VRF. I am not totally sure on the qualifications for the existing indoor coils for this but it sure makes life easy on a number of levels if yours is a candidate . You will have to contact them for more info but here is the commercial products page.
https://dvmdownload.com/DVM-S-Series-(VRF)/
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I hesitate to become a beta tester of VRF because of the highly proprietary nature of the equipment. Virtually all parts come from one source, and that source has you by the short hairs....
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2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
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Originally Posted by
timebuilder
I hesitate to become a beta tester of VRF because of the highly proprietary nature of the equipment. Virtually all parts come from one source, and that source has you by the short hairs....
I can truly appreciate where you are coming from. The really disappointing reality though is that even the domestic products have gotten that way. Heck , the original manufacturer of the system in question couldn't care less about it. And to be able to convert it in place to a variable capacity machine and having it work better than it did when it was new is a win / win .
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I have a 40ton with an 06E and an 06D running on POE/407c for going on 2 years now without issue.
I also did a dozen 10-14ton package units and all are marching hard. The conversion was straightforward. Hardest part of the whole project was . . rust remediation.
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Thanks for the input guys after a discussion with the sales man and the business owner the decision has been made to replace the R22 condenser with 410 and leave the existing evaporator. The 407 retrofit was my first chose but the owner does not want to invest that kind of money in a 17 year old unit. I can appreciate where he is coming from I would hate to retrofit the existing system and have a compressor go out a year later. I would never hear the end of it and would probably loose a good customer. I have explained to him that there will me a slight capacity and seer loss with the existing evaporator and he was fine with that. A new 20 ton condenser sale versus a retrofit is good for the revenue.