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Posted by Rod on May 13, 2008, 10:09 pm
> I maintain a couple office complexes with multiple fujitsu and mitsubishi
> minisplit systems in the southeast. One particular unit developed a leak d=
ue
> to building exterior wall (heat expansion on a 95F day) causing a stress o=
n
> the suction lines, fastened through the wall inside a conduit that runs in=
to
> the condensing unit outside.
> Manufacturer rep stated that they recommend an unconditional evacuation an=
d
> re-weighing of the factory charge (2 lbs 5 oz) every time a leak is
> corrected.
> Sounds a little extreme but am planning on taking care of it this week.
> These are all 410a systems.
> Tom
Most if not all mini split manufactures recommend this. R410A is a
blend of 2 different refrigerants and depending on which camp you
believe, one refrigerant may boil off or leak out quicker than the
other and leave you with a compromised mixture of freon that isn't up
to snuff (instead of the original 50/50 blend it may end up 60/40).
Some 410A training I've taken has said this can happen and some has
said it can't. Better safe than sorry I guess. Remember you have to
add freon for any additional lineset over 25' for most of these
systems.
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