01-26-14, 10:39 AM | #21 |
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R410a
By the way , you all probably already know this . But , on the off chance some one does not , I will throw it in .
I read R410a is a blend / mix of 2 types / kinds of refrigerants . Instructions say to always charge with liquid ( tank up side down ) . On my leak , I was fortunate enough to catch it while it still had a little pressure in the system . I valved off both service valves , so I did not have to worry about air / moisture entering the system . Of course , it did when I re-flared the small line . When I vacuumed the system down , I was really only pulling a vacuum on the lines and the indoor fan coil unit . I have read of the 3rd world method of just purging the lines with a little R410a gas . With the equipment , copper , insulation , tooling , etc. , plus the labor that went into the install . I was not about to take a chance on that method ! Besides , I had already made one dumb mistake ! :-( And , I had long ago acquired the tooling to evacuate the system . By the way , my unit has only a 1/4" service fitting , on the large service valve . But not on the small service valve . I have since learned not to call them high pressure and low pressure valves / lines . I read that , in heat pump mode , the high side becomes the low side , and vice versa ? I have read there MAY be a service fitting on the small line , inside the condenser cabinet ? I am surprised , I figured the mini split would use the service fittings found on automotive R134a systems ? But mine does not . God bless Wyr |
01-26-14, 11:14 AM | #22 |
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Nylog Blue also works on R22 and R12.
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01-26-14, 12:16 PM | #23 |
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Good to know , Thank you . :-)
I did not know if it would contaminate the mineral oil ? I have read that Nylog is polymerized refrigeration oil ? In the case of Blue , I guessed it was POE ester oil ? Before I start up my central A/C condenser , next spring / summer , I need to swap out the Schrader valves . ( I have the tool to do this w/o discharging the R22 . ) The system has a very slow leak , that I have not found anywhere else in the system & Schrader valves are a likely suspect ? I had planed to coat the new Schrader valves with mineral oil , but from what you have told me , Nylog Blue would be OK , too ? God bless Wyr |
01-26-14, 03:32 PM | #24 |
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Service valve leaks are very common, especially if the installer didn't remove the valve cores while brazing the connections.
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01-26-14, 05:13 PM | #25 |
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Huh???
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01-26-14, 05:48 PM | #26 |
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Most central units in the US use brazed connections.
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