This is a Defy fridge and this compressor is a Sicom made in Brazil.
There is a blockage in the system but we are lucky, it's not completely blocked, there is
still a bit of circulation but we've got to clear the blockage.
Now what I did was I removed the suction from the compressor and the capillary here, and
we weld a valve on each side.
like that Now what I did was I used a bottle of 404
gas which has a pressure slightly higher than 134a
So we attach the charge line and we blow it up the capillary and we blow it here, so we
move the dirt around inside until we get to a point where the dirt can be blown out
So by just adding a bit of 404 here, it does come through the capillary now, but its still
not completely clear.
Now, it's nice to know if you find out what caused the blockage now on this particular
compressor, the Sicom, the copper wires inside the winding has a coating on it.
This coating dissolves when the compressors run very hot and this dissolved coating goes
into the system and it will block the capillary.
Now we find when it blocks like that it's normally the end of the capillary closest
to the inside that blocks.
So what we do is, we actually put some thinners, normal thinners in the system which actually
dissolves it, but you don't want thinners in the compressor it harms it, so what I do is,
this charge line here I connect to a vacuum pump and we have a little container with thinners
here and we suck a vacuum and that will suck a little bit of thinners up the capillary
tube and then straight away blow it out with the 404 gas.
Okay, we've connected a charge line onto our vacuum pump, and this is the thinners.
So we just pour a little bit of thinners into a container
Put the end of this, which is the valve to your capillary, in the thinners
and we switch the vacuum pump on.
Now it will suck a vacuum up the suction in the system which will allow a little bit of
thinners to be sucked into the system.
Now you don't want to suck too much in, if the thinners finds its way back through into
the vacuum pump it can damage it.
So we do this for about 30 seconds, a little bit of the thinners will go into the system.
Switch the vacuum pump off and then I normally put this in to see what comes out of the system.
So straight away from a vacuum we go onto the 404 gas.
We open it, and there its blowing the thinners out and hopefully some of the dirt as well.
You can hear it blowing and it comes out with the dirt and the thinners mixed and its dissolving
the resin and the dirt.
Now we can see what came out of the system, its mostly thinners but there is a lot of
dirt in the thinners as well.
What the thinners does is it dissolves the resin inside the capillary but it moves the
dirt around and once the thinners dries this resin is even harder than before, so you want
to blow it out as quickly as possible and we use the 404, until we come to the point
where it blows evenly, then I will put some thinners on this side.
I will apply thinners in here and we'll probably blow about 50 ml of thinners through the
system with the 404 until this comes out clean and we are sure we've got all the resin out
of the system and then the thinners that's left behind I will clean with a refrigerant
flushing system there is quite a few on the market but I don't use the flushing system
to clean the dirt, I use it to remove the thinners once we have cleared the blockage.