You would have to use a "suction" filter drier. The external lineset on a
minisplit is different from the conventional systems. Rather than a liquid
line, the smaller line is a feed from the TXV in the outdoor unit. The
larger line is a return line [suction during cooling.]
Otherwise, you would have to locate the liquid line [in both heating and
cooling application] in the outdoor unit, cut and install a "bi-flow" liquid
line drier there. But if you had a severe burn out, I would recommend one
with high capacity carbon [usually designated HH].
What's the manufacturer suggest?
Have no idea what you talking about but if you check with
drier OEMs you find out that filters are made for liquid filtering
and not for gas, in gas line are ineficient and that is why are
never install in gas lines, however you can install them any
place you wish, filters are also made for suction lines oil return
lines but not for gas lines in refrigeration systems.
One time, the parts house suggested a vapor line filter. it was rather
short, and a very wide cross section. Looked like the filter had swollowed a
Unlike the liquid line filters which look like a snake which has swollowed a
Generally, after a compressor replacement, it is recommend that a suction
line filter drier be installed. If it's a burn out, a high in carbon filter
drier is used to help remove acidic particulate.
For the Old & Grumpy, the suction line contains vapor. It is highly NOT
recommended to put any desiccant drier in the hot gas discharge line. Only
in the liquid or suction lines.
Because of limited use of "flushing agents", most Manufacturer's don't
recommend putting anything in a refrigeration system other than refrigerant
and refrigeration oil. After 1990, the use of R-11 as a flushing agent was
banned, [although a good remedy for cleaning and flushing burnt material
from a burn out.]
Because of the metering devices, four way valves, and check valve [in some
systems] desiccant driers are high recommended. Sometimes some
Manufacture's recommend new four way valves as well for burn outs.
Good Luck Mr. O.P.
Anyway, I'm left wondering, what is the problem with placing a bi-flow
filter drier into the gas-line of an inverter driven mini split system
after or with a compressor replacement, or ever?
How, in this repect, would an inverter driven compressor system be
different from a DOL single speed compressor mini-split system?
Is it a Heat Pump? Or cooling only?
Paul feels it wouldn't matter as long as you use a Sporlan Catch - All. I'm
not so hip on using a drier on the lineset outside of the outdoor unit. I'd
put it in the common liquid line inside the outdoor unit. But that's just
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