Our Valued Sponsor
OpinionsConsumer ReviewsGuides and How TosCoffeeGeek ReviewsResourcesForums
Espresso: Questions and Answers
Nuova Simonelli Oscar - No Steam!
Find the Right Machine...
Package deals on the best machines from Izzo, Quick Mill, Rocket, La Marzocco & more.
www.clivecoffee.com
 
Not Logged in: Log In to Postlog in
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered  
Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Discussions > Espresso > Q and A > Nuova Simonelli...  
view previous topic | view next topic | view all topics
Author Messages
enda1
Senior Member


Joined: 5 Aug 2013
Posts: 5
Location: London, UK
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Mazzer Super Jolly
Posted Mon Aug 5, 2013, 8:41am
Subject: Nuova Simonelli Oscar - No Steam!
 

Hi all,

I've semi-recently won a NS Oscar on ebay. I had good stable use for probably 3 months but of late I'm having trouble maintaining steam pressure. I've cleaned it out with citric acid solution and replaced the grouphead gasket. I've got a pressure gauge to attach to a portafilter with which I measured that I have loads of brew pressure (the pressure rose to above 16bar - the max the scale reads to).
What should I look out for and how will I fix my issue if I see that the pressure is dropping off mid steam?

The machine's a good few years old and does not have the Sirai pstat.

It takes about 30s to 60s of steam release for it to drop to virtually (and sometimes actually) nothing.

I've been looking to replace the pstat if this could be a fault. Maybe I should measure the water temperature? I have a very good food electronic thermometer which I could use for that.
back to top
 View Profile Link to this post
calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,942
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Mon Aug 5, 2013, 9:42am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

That machine is sounding a bit sick.

When you got 16+ bar, was that on the brew cycle? If so, you have way too much pressure, you should be at around 9 bar for brewing.

For boiler temp, you should be about 240F give or take a little, or around 1.2 or so bar. If you connect the gauge to the steam wand and open the valve (I know it is a button) you will be reading boiler pressure and indirectly what the boiler temp is.

Helen (Coffeenewbee) has much more time inside the Oscar than I have and is pretty up to scractch on how to adjust inside there. She is drawn like a moth to a flame to Oscar threads so I am sure she will get here as soon as she sees the post!

The first thing to do is to get the normal operating specs to spec. Then work on any steam issues.

Oscar has a pretty good size boiler so you should not be seeing that radical drop in steam pressure. The main reasons for limited steam pressure time is a small boiler, low power heater, small air space in the boiler (think of it as a steam "spring" storing steam. However if it is too big, the heater is exposed and that is bad too.) Scale can play a part in both coating the heater and taking up room in the boiler thus reducing the volume of water available to make steam. If the machine has had poor service, even a one time descale may not be enough. I have seen neglected machines have more than half the space in the water chamber filled with scale sludge and that often requires more drastic action than just citric acid.

The inrush of cold make up water can also drop steam pressure. Oscar has a auto fill circuit and it will fill the boiler any time it wants to.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
back to top
 View Profile Visit website Link to this post
enda1
Senior Member


Joined: 5 Aug 2013
Posts: 5
Location: London, UK
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Mazzer Super Jolly
Posted Mon Aug 5, 2013, 10:10am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

Thanks for your reply.
Because the Oscar doesn't have an over pressure valve, I was lead to believe that a brewhead pressure would rise to 16bar (that of the pump).
I've ordered an OPV + anti VAC kit anyway in the meantime to modify the Oscar, but I believe it is normal for the Oscar to show that pressure at the brewhead.
I'm measuring this pressure using a portafilter with a pressure gauge attached where the spout would normally screw on.

I don't have anything to measure the steam pressure, though as it drops to 0 usually before the heating cycle kicks in, its safe to say it's too low.

I'm also pretty sure it's not a cleaning issue as when I empty the boiler it has no problem flowing through the steam wand. I've also checked the water level meter to make sure it was clean and properly inserted.

I've a feeling the temp of the boiler is too low and that this is directly linked to the steam being too low. So I guess it's probably the pstat that's done in as the machine is 6-8 years old.
back to top
 View Profile Link to this post
enda1
Senior Member


Joined: 5 Aug 2013
Posts: 5
Location: London, UK
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Mazzer Super Jolly
Posted Tue Aug 6, 2013, 8:01am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

Any more thoughts from anyone?

I think I'll go about charging the pstat and installing the OPV and anti-vac like I mentioned whilst I've the case off.
Hopefully that will bring my boiler pressure back to normal.
back to top
 View Profile Link to this post
frank828
Senior Member


Joined: 23 Feb 2011
Posts: 581
Location: Los Angeles
Expertise: Professional

Posted Tue Aug 6, 2013, 9:00am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

i was playing with my steam yesterday(steam ironing a shirt haha) and noticed that the steam will not be steady for 30-60seconds.  most of your steaming should be complete before 30 seconds so i wouldnt think it would be a problem.  even with a 2 hole steam tip installed, i dont think i ever reached needing even 20 seconds of steam.  with the 4 hole tip, i literally will be done steaming in less than 10 seconds.
back to top
 View Profile Link to this post
enda1
Senior Member


Joined: 5 Aug 2013
Posts: 5
Location: London, UK
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Mazzer Super Jolly
Posted Tue Aug 6, 2013, 2:18pm
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

frank828 Said:

i was playing with my steam yesterday(steam ironing a shirt haha) and noticed that the steam will not be steady for 30-60seconds.  most of your steaming should be complete before 30 seconds so i wouldnt think it would be a problem.  even with a 2 hole steam tip installed, i dont think i ever reached needing even 20 seconds of steam.  with the 4 hole tip, i literally will be done steaming in less than 10 seconds.

Posted August 6, 2013 link

I don't think you quite get me when I say the steam is weak.
It's feeble even to begin with before fading to almost nothing. I cannot foam 100mls of milk even!
back to top
 View Profile Link to this post
enda1
Senior Member


Joined: 5 Aug 2013
Posts: 5
Location: London, UK
Expertise: I love coffee

Espresso: Nuova Simonelli Oscar
Grinder: Mazzer Super Jolly
Posted Mon Aug 12, 2013, 6:13am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

Steam glorious steam! Replaced the pstat with the new Sirai one. The old MA-TER one is tiny in comparison.
So it seems to have fixed the issue. I want to run it for a good week and recheck all seals before confirming it's fixed.

Next job is to install the OPV and Anti-Vac
back to top
 View Profile Link to this post
Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,046
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Mon Aug 12, 2013, 11:19am
Subject: Re: Nuova Simonelli Oscar - No Steam!
 

I love my vac valve, I did not bother with the OPV.

 
Coffeenoobie

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

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
back to top
 View Profile Visit website Link to this post
view previous topic | view next topic | view all topics
Discussions > Espresso > Q and A > Nuova Simonelli...  
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered     Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Not Logged in: Log In to Postlog in
Discussions Quick Jump:
Symbols: New Posts= New Posts since your last visit      No New Posts= No New Posts since last visit     Go to most recent post= Newest post
Forum Rules:
No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.
No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.
No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.
No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.
Who Can Read The Forum? Anyone can read posts in these discussion boards.
Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.
Who Can Post Replies? Any registered CoffeeGeek member can post replies.
Can Photos be posted? Anyone can post photos in their new topics or replies.
Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.
Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.
Donate to Coffee Kids
Coffee Kids works with farming communities around the world, improving lives. Donate today.
www.coffeekids.org
Home | Opinions | Consumer Reviews | Guides & How Tos | CoffeeGeek Reviews | Resources | Forums | Contact Us
CoffeeGeek.com, CoffeeGeek, and Coffee Geek, along with all associated content & images are copyright ©2000-2014 by Mark Prince, all rights reserved, unless otherwise indicated. Content, code, and images may not be reused without permission. Usage of this website signifies agreement with our Terms and Conditions. (0.272243022919)
Privacy Policy | Copyright Info | Terms and Conditions | CoffeeGeek Advertisers | RSS | Find us on Google+