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Repairing Bezzera Bz99S ...HELP!!!
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ricardo_dacosta
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Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Wed Oct 23, 2013, 4:26am
Subject: Repairing Bezzera Bz99S ...HELP!!!
 

Hey there! After months of hunting and researching for a Hx machine, I purchased a Bezzera BZ99S off Ebay few days ago.

Its in decent condition, so far, but needs some cleaning. I Figured I would start by taking apart the group head, being that it is easy to remove which is a plus on this machines.

As you can see, it doesnt look too good. The gasket inside seems glued to it and coffee residue is thick. Was able to remove the gasket and spent about an hour in my kitchen sink scrubbing the inside with a brush. looks better now but was wondering if its a good idea to soak it in a citric acid solution? Or is that solution used mainly for scale build up

The shower difuser although I was able to clean it, it looks like I might be better of replacing it. Seems like it may be clogged. Would that be a good move?

After im done cleaning and replacing parts of the grouphead, I plan to measure flow rate to see if all is good. Any other suggestions as far as the group head?

ricardo_dacosta: rps20131023_072345.jpg
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jonr
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Joined: 25 Jun 2013
Posts: 294
Location: Americas
Expertise: I like coffee
Posted Wed Oct 23, 2013, 8:02am
Subject: Re: Repairing Bezzera Bz99S - Grouphead
 

Someone once suggested putting a clogged screen on the stove to burn off coffee residue that you can't remove otherwise.  I tried it and it worked very well.
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ricardo_dacosta
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Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Thu Oct 24, 2013, 4:42pm
Subject: Re: Repairing Bezzera Bz99S - Relay click
 

Well...everything was going well...cleaned my group head, replace both green and orange lamps and switches and thought to descale and flush the boiler. Not sure how it happen, but machine was working fine and while flushing my 3rd time through the hot water spout, the wall socket gave up on me :(

Went downstairs to the breakers box and moved the breaker back to on. Turn on the machine and heard a click which made the green light go off and no pump noise nor any of the nozzles operate now. I removed the cover and panels to investigate the source of the sound and whether there was an un-connected wire but everything seem connected. Did notice it is the relay box which is clicking right after i push the orange button on. Picture below.

I can also see a sort of spark as it clicks.

Not sure how bad this is but I couldnt finish descaling it as the machine stopped so there is citric acid solution inside the boiler and HX I supposed. Feeling bummed now :(

Any ideas?

ricardo_dacosta: rps20131024_193107_800.jpg
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ricardo_dacosta
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Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Thu Oct 24, 2013, 7:24pm
Subject: Re: Repairing Bezzera Bz99S - Testing Heat Element Resistance
 

I decided to test the resistance of the heat element as I have read one possibility could have been water causing a short in the heat element. As you see in the picture I got 11.56 for a 1200W element. Not sure how perfect the number should be but seems close to me and there was no fluctuation nor there was any readings when I had one touching the rest of the boiler. So I guess my Heat Element is good.

I also removed the pipes that lead to the grouphead, the steam wand and the hot water wand to see if were clogged but they weren't

Should I just replace the Relay and see? Anyway to test the relay before buying one?

ricardo_dacosta: rps20131024_221648.jpg
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jannus
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Joined: 19 Mar 2013
Posts: 66
Location: South Africa, Cape Town
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Espresso: NS ElliMatic & OLD Via...
Grinder: mazzer sj
Vac Pot: nope
Drip: yup
Roaster: nope
Posted Fri Oct 25, 2013, 3:30am
Subject: Re: Repairing Bezzera Bz99S - Testing Heat Element Resistance
 

It should be quite easy to test the relay, seeing as you have a multimeter.  If it is double pole, just remember to test both poles.  On the other hand, replacing it is as easy, so if testing it will be a problem, it might be worth the few dollars' gamble to just replace it.  Just please be careful when working with live, open wires while testing the relay.  A short there can be pretty deadly to you and/or the machine.

Also remember that the heating element can have a lot more wrong with it than just internal resistance.  If there's a pinhole it can cause a partial short to ground, which will cause problems.  Only way to test that is with a megger.  I don't have one, and on my last rebuild ended up at an outfit that manufactures custom elements.  They were kind enough to test it for me.  IIRC you should have about 20Megs resistance on the megger.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
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Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
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Roaster: gave it a try, decided no
Posted Fri Oct 25, 2013, 8:20am
Subject: Re: Repairing Bezzera Bz99S - Testing Heat Element Resistance
 

Remove both wires from the heater and check from the connector to ground. If you get any reading at all, you have a leak to the heater element and it will need to be replaced.
I'm not clear which device in your pic it is that you said was showing arcs. The Pstat switches the heater on and off so the contacts tend to become arced over and can loose the ability to do their job, much like the points in a car, well, er, on the cars that had them, if you are either old enough to have grown up with them or like to play with "antique" cars :P


As for cleaning coffee tar from components, use the soaps/cleaners that are designed for this, No endorsements of any website, links for reference only.
Pul cafe or Cafiza (I use that one)
http://www.libertycoffee.co.uk/acatalog/Pully.html
Joe Glo http://www.joeglo.com/Pages/JoeGlo%20Jar%20page.html

Personally, I would not try to burn it off. YMMV

 
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!
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ricardo_dacosta
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Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Fri Oct 25, 2013, 1:49pm
Subject: Re: Repairing Bezzera Bz99S - descaling boiler
 

I decided to take the entire boiler apart and found a lot of build up inside. Wondering if this may have clogged anything and prevented the machine to work properly. Im soaking the entire thing in citric acid solution now. Will see how it goes afterwards. Hopefully I can put it all together again. I took a bunch of pictures as suggested here in the forums prior to get it apart :)

ricardo_dacosta: rps20131025_164332.jpg
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ricardo_dacosta
Senior Member


Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Fri Oct 25, 2013, 8:39pm
Subject: Re: Repairing Bezzera Bz99S - descaling boiler
 

I gave a nice soak to the boiler the HX and few other parts and they came out really nice. Put the machine back together hoping that maybe it was a bunch of scale clogging the boiler but no luck...as soon as I turn it on my breaker jump.

I tested the resistance of the heating element just to make sure and interesting enough yesterday read 11.53 and today is reading 8.04. Heating element is supoosed to be 1200W at 110V. Also yesterday when I tested one terminal against any other part of the boiler i would get no reading so I assumed the element was good but today it does give me a reading for a few seconds and then it settles in infinite.

Im thinking I may have a short in my heat element. I'm gonna try heating it up in the oven like orphan espresso suggests and see if that saves it. If not I guess I will have no choice but to rreplace the element.

Im open to any other ideas/suggestions

Thanks!!!

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ricardo_dacosta
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Joined: 30 Jul 2013
Posts: 34
Location: Montclair
Expertise: I like coffee

Posted Sat Oct 26, 2013, 8:39am
Subject: Re: Repairing Bezzera Bz99S - descaling boiler
 

Ended up literally baking the heat element in the oven for a few hours to remove any humidity and yes it did seem to remove the short as I dont get any readings when one cable is on the terminal and the other elsewhere in the boiler.

However the resistance that is giving me is 5.3 now. Supposed to be around 12 as it is a 120V 1200W.

Could this be the cause why is causing the breaker to trip?
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,385
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Sat Oct 26, 2013, 10:09am
Subject: Re: Repairing Bezzera Bz99S - descaling boiler
 

Since the element is suspect, and you have the entire machine apart and cleaned, if the element is affordable go ahead and replace it. Almost like getting a new machine, and worst case is that you would have a spare element.

 
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