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help with backflushing a NS Oscar
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shmish
Senior Member


Joined: 20 Jun 2009
Posts: 27
Location: Vancouver BC
Expertise: I like coffee

Espresso: Krup 964
Posted Tue Apr 24, 2012, 7:09am
Subject: help with backflushing a NS Oscar
 

Hi,
The Oscar comes with a blind filter and I thought it would be a good idea to backflush it.  I've never seen how this is done, so I looked at a few videos on youtube.  What I've seen is that while backflushing, the water comes out of a spout somewhere.  However, on the Oscar the this does not happen. With the blind filter in place, I turn on the pump and pressure builds but the water is not actually flushed out anywhere (not that I can see).  So I'm really not too sure what is happening here, I don't see where the "flush" part comes into play.

thanks
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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,135
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Tue Apr 24, 2012, 10:28am
Subject: Re: help with backflushing a NS Oscar
 

There is a tube that is behind the front panel that goes to the drip tray.  

I lock in the blind filter and turn pump on for 10sec then turn pump off, sometimes the flow doesn't happen until the PF is unlocked.

After a session of making shots I always do a scrub of the group head then a water back flush, repeat.

Every week I do a chemical back flush. I start by unscrewing the screen and brass diffuser to scrub and soak in cleaning solution along with PFs and baskets. I reinstall diffuser and screen and put a scoop of cleaner in the blind PF basket and back flush the group. Repeat 5 times and then scrub and fresh water flush.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 2,972
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Tue Apr 24, 2012, 11:02am
Subject: Re: help with backflushing a NS Oscar
 

Don't forget the portafilter wiggle!  I will see if I can find a video to show you.  I can't find the one that has the portafilter wiggle. You just wiggle it in holder carefully so that the hot water comes out the sides of the blind basket to help clean off the group head gasket.  I backflush with water every session and do the wiggle almost every time.

this is a good video:


http://www.youtube.com/watch?v=k1Vkfj83uyg

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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shmish
Senior Member


Joined: 20 Jun 2009
Posts: 27
Location: Vancouver BC
Expertise: I like coffee

Espresso: Krup 964
Posted Wed Apr 25, 2012, 3:10am
Subject: Re: help with backflushing a NS Oscar
 

germantownrob Said:

There is a tube that is behind the front panel that goes to the drip tray.  

I lock in the blind filter and turn pump on for 10sec then turn pump off, sometimes the flow doesn't happen until the PF is unlocked.

After a session of making shots I always do a scrub of the group head then a water back flush, repeat.

Every week I do a chemical back flush. I start by unscrewing the screen and brass diffuser to scrub and soak in cleaning solution along with PFs and baskets. I reinstall diffuser and screen and put a scoop of cleaner in the blind PF basket and back flush the group. Repeat 5 times and then scrub and fresh water flush.

Posted April 24, 2012 link

Thanks, I now see the outlet.  Similar to you, there isn't any flow for the 10 s that I have the pump on.  Once I turn off the pump, there is a short burst like a "pffft" where some steam and a bit of water comes out.  There isn't any real flow of water though.  Does that sound normal?

cheers
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faaparasite
Senior Member


Joined: 19 Jun 2003
Posts: 290
Location: Dallas Metroplex
Expertise: I love coffee

Espresso: Bezzera BZ99
Grinder: Mazzer Super Jolly
Drip: Technivorm
Posted Wed Apr 25, 2012, 6:50am
Subject: Re: help with backflushing a NS Oscar
 

shmish Said:

Thanks, I now see the outlet.  Similar to you, there isn't any flow for the 10 s that I have the pump on.  Once I turn off the pump, there is a short burst like a "pffft" where some steam and a bit of water comes out.  There isn't any real flow of water though.  Does that sound normal?

cheers

Posted April 25, 2012 link

Yep, that's how it works.  If you didn't have the 3 way valve, when you remove the portafilter the accumulated pressure would spray grounds and hot water all over the place.  The sound you're hearing is the 3 way valve doing its job.
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germantownrob
Senior Member
germantownrob
Joined: 2 Dec 2007
Posts: 2,135
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Wed Apr 25, 2012, 9:03am
Subject: Re: help with backflushing a NS Oscar
 

faaparasite Said:

Yep, that's how it works.  If you didn't have the 3 way valve, when you remove the portafilter the accumulated pressure would spray grounds and hot water all over the place.  The sound you're hearing is the 3 way valve doing its job.

Posted April 25, 2012 link

And when you do a chemical back flush it usually puts more flow through the 3 way valve and tube especially when on the 3rd or fourth press of the brew button. Probably would do the same when doing a water back flush but only loosen the PF and then lock it again then press the brew button, see if you see more flow.

The left side of the group is another tube, that is the opv side and let's off pressure during the shot if it goes higher then what the opv is set at.
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