How to change oil in a rotary compressor?

Posted by Lars S on July 26, 2009, 2:50 pm

Hello, Im new to this forum.
I have a brand new small R22 Fuji rotary (on/off) compressor which I
intend to
use for 407C and therefore an oil change to Ester type is neccesary.
Can only drain oil (~300ml) out of a hole I drilled close to the
connection (HP) non from the suction line (muffler is removed). From
what I have read there should be some oil also in the lower (suction)
part or...?

/Lars S

Posted by on July 26, 2009, 3:02 pm

On Sun, 26 Jul 2009 11:50:07 -0700 (PDT), Lars S

>Hello, Im new to this forum.
>I have a brand new small R22 Fuji rotary (on/off) compressor which I
>intend to
>use for 407C and therefore an oil change to Ester type is neccesary.
>Can only drain oil (~300ml) out of a hole I drilled close to the
>connection (HP) non from the suction line (muffler is removed). From
>what I have read there should be some oil also in the lower (suction)
>part or...?
>/Lars S

Take it to Jiffy Lube.

Tell them you want 'The Works'.

--
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Posted by Stormin Mormon on July 26, 2009, 9:42 pm

Years ago, I drained the oil out of a window AC rotary, by
tipping it upside down. Then power it up, and the oil blows
out the high side.

You may be able to pump the new oil in, through the high
side line.

Drilling a hole in the compressor shell? I hope you have
the ability to weld it shut?

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

Hello, Im new to this forum.
I have a brand new small R22 Fuji rotary (on/off) compressor
which I
intend to
use for 407C and therefore an oil change to Ester type is
neccesary.
Can only drain oil (~300ml) out of a hole I drilled close to
the
connection (HP) non from the suction line (muffler is
removed). From
what I have read there should be some oil also in the lower
(suction)
part or...?

/Lars S

Posted by Lars S on July 27, 2009, 1:21 am

On 27 Juli, 03:42, "Stormin Mormon"

> Years ago, I drained the oil out of a window AC rotary, by
> tipping it upside down. Then power it up, and the oil blows
> out the high side.
> You may be able to pump the new oil in, through the high
> side line.
> Drilling =A0a hole in the compressor shell? I hope you have
> the ability to weld it shut?
> --
> Christopher A. Young
> Learn more about Jesus
> =A0www.lds.org
> .
> Hello, Im new to this forum.
> I have a brand new small R22 Fuji rotary (on/off) compressor
> which I
> intend to
> use for 407C and therefore an oil change to Ester type is
> neccesary.
> Can only drain oil (~300ml) out of a hole I drilled close to
> the
> connection (HP) non from the suction line (muffler is
> removed). From
> what I have read there should be some oil also in the lower
> (suction)
> part or...?
> /Lars S

Thanks Christopher!
Yes welding is no problem, I know many refr engineers but no one knows
how to change oil...

If I only fill oil in the high side, will the suction side run dry
until oil has been recirculated?

/Lars S

Posted by Stormin Mormon on July 27, 2009, 8:41 am

Someday I should cut open one of those rotary compressors.
As I understand it, the high pressure side goes to the area
around the pump. If it were an automotive engine, what would
be called the crankcase. So, pumping oil in the high side
should be same as filling the crankcase. The oil should
lubricate nearly immediately. You won't get 100% of the old
oil out, so there should be enough to lube for the first
couple seconds.

That's just my experience from trying it with one
compressor.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

Thanks Christopher!
Yes welding is no problem, I know many refr engineers but no
one knows
how to change oil...

If I only fill oil in the high side, will the suction side
run dry
until oil has been recirculated?

/Lars S

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