Leaking Linea........
At work there is an older 3 group LaMarzocco Linea. Due to city moratorium the machine drain can't be hard piped and is drained into a 5 gallon bucket. Problem is when the machine is OFF overnight it is filling the bucket up and running over, creating a mess to say the least. Doesn't seem to be any leaking while the machine is ON. The machine is a refurb and has been in use at work for 6-7 months. I've only been there 2 months and asked them if it has been backflushed and they have no idea what the process is or what it involves. Could dirty group valves cause leaking like this? The last few weeks I have started a backflushing regimen. How often should this be done with Cafiza? With just water? We serve anywhere from 25-100 people with espresso based drinks. BTW, this issue was apparent before I started backflushing, which is why I decided to start doing it in the first place. Thanks in advance. Later!
Replies to This Discussion
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Permalink Reply by Jesse -D-> on
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with water every hour if you can, every night with cafiza or equivelant. I don't think that this is your biggest problem though.
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I asked our tech guys about this, they said to check your sight glass to make sure that the machines auto fill function is working properly. Also you expansion valve may need adjustment. This is located in the drain box found underneath your drip tray. IT is the bigger brass fitting in the box. Turn it left for less pressure and right for more pressure. Your pressure gauge should be stable and read between 9-11 bar when filling. Good luck.
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Permalink Reply by nik orosi on
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on steam boiler you have two sensors for the lowest and highest water level, maybe water is to hard and due to using that kind of water, sensors are getting wrong info about water in boiler so fill in pump is working over night and true your expansion valve (the one next to this two) water is going out from boiler cos is overfilled. shot out lm, take this two low and high out and clean their bottoms...put them back...one of solutions...lm is easy on hard water...thou i dont understand why when is off. also, take care of shooting off your lm. gaskets are going off faster, your pipes and everything is heating and cooling and all is changing due to that. some minor energy savings, but machine is suffering form not stable all the time...im strange but i was thinking of this all to many times
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Permalink Reply by Alun Evans on
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A you have mentioned the machine does not seem to be leaking when on...which may actually mean the leak is not where you are expecting it (ie I guess you are thinking it is coming from the groups). My guess is if its coming through the waste hose it could be the boiler release valve/tap could be the fault. This empties the boiler normally into the catchment under the drip tray. It would also be leaking during the day, but as its out of sight it would be unnoticed.
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Permalink Reply by Bill Warnock on
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im gona go with jesse on this one most defiantly and also to fine tune it pull a shot and while pulling the shot check your brew pressure should be on the bottom of the pressure gauge make sure its at 9 bar while pulling (not an empty portofilter!!) if you have the pressure relief and pressure set properly you should have no problem with too much leaking, the pressure relief will almost always drip but i think 5 gal is a bit excessive
btw adjust pump pressure with the adj screw sometimes a nut on most lm pump heads i've seen a straight screw driver should do.
Jesse -D-> said:I asked our tech guys about this, they said to check your sight glass to make sure that the machines auto fill function is working properly. Also you expansion valve may need adjustment. This is located in the drain box found underneath your drip tray. IT is the bigger brass fitting in the box. Turn it left for less pressure and right for more pressure. Your pressure gauge should be stable and read between 9-11 bar when filling. Good luck.
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Permalink Reply by Mickael on
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If you look inside your drain box you are going to see two fittings. the one on the left (cylindrical shaped) is your expansion valve. When your unit is heating there should be a small flow of water coming out. This is called your expansion valve it allows some of the pressure to escape due to the water expanding while being heated. This can be adjusted and/or replaced. If you have water flowing from the right fitting (called the brake drain) then you have a leaking group valve that will have to be replaced.
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