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Boiler Tank Overflow Problem - Expobar 1 Group
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twiztedwords
Senior Member


Joined: 6 May 2014
Posts: 3
Location: Springfield, MO
Expertise: I love coffee

Posted Tue May 20, 2014, 10:26am
Subject: Boiler Tank Overflow Problem - Expobar 1 Group
 

I've been restoring an Expobar as a pet project.  It's been riddled with problems so I'm pretty stoked I'm down to only one left!...lol.

The issue I'm having is that when water is flowing through the group, the tank fills completely and overflows through the pressure relief valve.  During normal fill the water fill sensor kicks off the pump okay, it's just when the grouphead is running that it overflows.

I figure that it's a problem with the fill tank valve, maybe the coil is bad?  Can someone confirm that I'm on the right track and offer insight?

Thanks
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,853
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 Tue May 20, 2014, 2:06pm
Subject: Re: Boiler Tank Overflow Problem - Expobar 1 Group
 

Hi and welcome
It does kind of sound like a fill valve leaking. The valve should prevent flow of water into the boiler at all times except for when the boiler fill system is calling for water. If the valve is leaking the check valve (different valve) may prevent the boiler pressure from reaching the pump or the pump may be blocking the pressure but when you call for brewing the pump is turned on by the brew system so regardless of what the probe reads, the pump will continue to pump and if the valve is leaking then the boiler will be over filled.

Good luck!

 
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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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Woody
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Woody
Joined: 26 Jan 2004
Posts: 607
Location: Hood River, OR
Expertise: I love coffee

Espresso: La Spaziale Vivaldi I
Grinder: Mazzer Major
Vac Pot: Hoover
Drip: yuck
Roaster: Behmor
Posted Tue May 20, 2014, 8:29pm
Subject: Re: Boiler Tank Overflow Problem - Expobar 1 Group
 

Just when the group is running? I might suspect a hole or leak in the heat exchanger.  I had a boiler overfill problem in a double boiler machine, there was some debris in the fill valve causing it not to close completely.  I wouldn't think this would only occur when the group is running if it was a fill valve.  Callblacksmith has more knowledge than I do.   He'll chime back in I'm sure.

Jon
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acasabia
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acasabia
Joined: 17 Oct 2008
Posts: 620
Location: Westchester, NY
Expertise: I live coffee

Espresso: Expobar Brewtus iv-p,...
Grinder: Quamar M80e, Hario slim
Vac Pot: Yama Vacpot, Aeropress,
Drip: french press
Roaster: hot-air popper.
Posted Tue May 20, 2014, 8:45pm
Subject: Re: Boiler Tank Overflow Problem - Expobar 1 Group
 

Which expobar is this? On plumbable brewtus models the OPV relief pumps into the drip tray, easily re-routed back to the tank if thats what you prefer.

Is the machine reaching and holding pressure? If so, this may be completely normal.

 
Anthony C

Currently pulling:
Path Coffee Roasters (PortChester, NY) Feather in cap espresso.

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Gimme! (ithaca, NY) Moca Java

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DavecUK
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Joined: 21 Sep 2005
Posts: 1,449
Location: UK
Expertise: I love coffee

Posted Wed May 21, 2014, 3:16am
Subject: Re: Boiler Tank Overflow Problem - Expobar 1 Group
 

twiztedwords Said:

I've been restoring an Expobar as a pet project.  It's been riddled with problems so I'm pretty stoked I'm down to only one left!...lol.

The issue I'm having is that when water is flowing through the group, the tank fills completely and overflows through the pressure relief valve.  During normal fill the water fill sensor kicks off the pump okay, it's just when the grouphead is running that it overflows.

I figure that it's a problem with the fill tank valve, maybe the coil is bad?  Can someone confirm that I'm on the right track and offer insight?

Thanks

Posted May 20, 2014 link

It could be a number of things, it's a pity you don't actually say which Expobar model you are restoring., a tiny clue here would help. so at the moment, this is all I can give you.

Bad autofill solenoid valve or valve plunger stucking
wired wrongly
HX in steam boiler leaking

First Remove electrical connections from steam boiler then.

  1. remove connections from solenoid valve and see if it still happens

  2. See if valve is actuating at all and whether the mechanism is sticking
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Woody
Senior Member
Woody
Joined: 26 Jan 2004
Posts: 607
Location: Hood River, OR
Expertise: I love coffee

Espresso: La Spaziale Vivaldi I
Grinder: Mazzer Major
Vac Pot: Hoover
Drip: yuck
Roaster: Behmor
Posted Thu May 22, 2014, 10:42am
Subject: Re: Boiler Tank Overflow Problem - Expobar 1 Group
 

After my 1st post, I can see where on a non-plumbed machine the tank would overfill with a bad fill valve only when running the group, since a non-plumbed would only have pressure at the fill valve when the pump is running.  I was thinking of my plumbed machine, where there is constant pressure coming in.

Jon
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