Hi, I installed my York system 2 years ago July 2011 and this month I found ice on my coils, I have 3.5 ton system with new refrigerant line about 35 ft long. the system came already charged with 4.4 pound of refrigerant which support 15 ft line . the guy who installed it did not add any refrigerant for the extra 20 ft pipe. One HVAC person came to my house and added 3.11 pounds of refrigerant to the system and checked leaks and did not find any by the joints. then said he could do the deal which will cost about $700 dollar, the system still under the warranty, I thought to buy the cliplight Dry R and 937 kit super seal for my 410a system, questions is how good is cliplight and do you recommend it. or do you have any other advice. Thanks

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   I have heard of York having some problems with leaking coils(along with almost all brands). Super seal could be used if this is the case and you have micro leaks, but this would be a band aid approach. If your system is still in warranty I would consider fixing the root problem which has yet to be determined. Sounds like the installer did not properly commission the system. Not knowing if there was a proper vacuum performed at installation, I would recommend the following work performed. Reclaim existing 410a refrigerant and replace/add refrigerant filter drier. Then perform a leak test using dry nitrogen. If there is a leak, fix or replace leaking component.  Once leak is found and fixed perform a proper vacuum to at least 500 microns. Add new 410a refrigerant and subcool or superheat depending on the metering device. Do not reuse existing refrigerant, which could be contaminated with moisture or air, or could have separated one of the mixed refrigerants. Make sure the technician verifies airflow across the evaporator coils before the final refrigerant charge. You will probably be amazed at how well your system will performed compared to before. Good luck!

all refrigerant systems leak.  all roofs leak.  all windows leak. All doors leak.   I use a lot of sealant  and clip light is better of all of them and if need be you can blow out all the "bubble gum"  with flush and dry nitrogen then put a vack  to under 500 Microns but over 200 microns so the oil in compress stays in system.   All the sealant I use works on very small holes and when hits air turns to gum so if the system is "wet"  then the whole thing seals up.  Most hacks do not use vack pumps just "flush the line" and open the valves then moisture just rots inside and     with R-410A  the oil expands with H2O  then the filter dryer fill up then beads get large then screen fills then beads get in to the meter/ cap tube, Then high presser 800 PSIG  then shuts down the compressor.    I have been to whole subdivision with plugged meters TXV's and Rev valves   

You may be focusing on the wrong culprit.  Ice forming on your coils could be caused by too little air flowing over the coil or an over-sized air conditioner.  The evaporator coils on my 3.5 ton AC frequently iced up before the outside compressor failed.  When I replaced the outside condenser and compressor with a 3 ton unit, the ice on the AC coil went away, comfort improved and my bills went down.

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