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Thread: Help with La Cimbali M20 1-group Setup

  1. #1
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    Help with La Cimbali M20 1-group Setup

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hello,

    I recently purchased a used La Cimbali M20 1-group. *Unfortunately, it came with no documentation whatsoever. *Im trying to wing it. *I could use help. [smiley=undecided.gif]

    The 220V hookup is pretty straightforward, and theres a nice chart under the electrical box lid.

    The problem Im having is with the plumbing. *In particular:

    • Whats the right inside diameter thickness for the water supply lead? *It looks like the unit accepts 3/8" connector, but the standard wall box valves for refrigerators and those types of accessory water lines is 1/4". *Will I hurt the unit by using a small diameter tubing such as 1/4"?
    • Is there a certain inlet pressure requirement? *Doing a search on water supply for M20 showed where someone mentioned needing some sort of pressure restrictor. *My house water pressure is probably roughly around 80psi.
    • The drain tube appears to be a high-temperature-resistant, industrial strength tube. *Is there a specific heat requirement for the drain lines?
    • Am I correct in assuming that a cold line feed is all thats needed? *No need to send hot water to the unit, is there?


    Any other pointers or advice would be greatly appreciated. *Plus, if someone had a PDF of the owners manual or service manual, Id love to get a copy. *:)

    Thanks in advance,
    Dave

  2. #2
    Senior Member
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    Re: Help with La Cimbali M20 1-group Setup

    Hi Dave and welcome to CoffeeSnobs....

    Ill answer your questions as best I can.

    Whats the right inside diameter thickness for the water supply lead? It looks like the unit accepts 3/8" connector, but the standard wall box valves for refrigerators and those types of accessory water lines is 1/4". Will I hurt the unit by using a small diameter tubing such as 1/4"?
    Well mine is 3/8 between the machine and the water softener and then a standard 1/2 inch to the supply...... I personally wouldnt go as small as 1/4 inch but it might work...You will restrict the water flow with 1/4 - and that would make the pump work harder.

    Is there a certain inlet pressure requirement? Doing a search on water supply for M20 showed where someone mentioned needing some sort of pressure restrictor. My house water pressure is probably roughly around 80psi.
    Yep between about 3 bar and should not exceed 5.5 bar (1 bar = 14 psi ) so 80 psi is just over the upper limit - again you might get away with it - just (keep your fingers crossed)

    The drain tube appears to be a high-temperature-resistant, industrial strength tube. Is there a specific heat requirement for the drain lines?
    The drain should be normal plumbing pipes... which can withstand boiling water. PVC plumbing is fine - but not the thin walled drainage pipe. I have used all rigid piping - if you intend to use flexible then yes, you would need to get high temp hose.

    * Am I correct in assuming that a cold line feed is all thats needed? No need to send hot water to the unit, is there?
    Nope - no need for hot water.

    Any other pointers or advice would be greatly appreciated. Plus, if someone had a PDF of the owners manual or service manual, Id love to get a copy.
    Ensure you have adequate current available from the mains - even the single group uses quite a bit of power.
    I have two manuals for other models (multi group and more recent)..... None seem to be available for this model. I can email you those if you wish, the models are all very similar. PM me your email address if you want them.

    Good luck with your M20. They are a great machine and make excellent espresso.

  3. #3
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    Re: Help with La Cimbali M20 1-group Setup

    Welcome JJ007.

    Ok in shorthand:

    Whats the right inside diameter thickness for the water supply lead? *It looks like the unit accepts 3/8" connector, but the standard wall box valves for refrigerators and those types of accessory water lines is 1/4". *Will I hurt the unit by using a small diameter tubing such as 1/4"?

    There will be NO problem upsizing or downsizing the size of the inlet water line. Yes the standard on full size Italian machines is 3/8" but you can convert that any way you like...I dont know where you are but if in Australia you can convert by way of the usual brass "nipples" to the standard Oz fitment which will be 1/2". Please fit a water filter /scale inhibitor & 350kPa water pressure reduction valve, if you need I can supply but I think you should take that off site to my private email.


    Is there a certain inlet pressure requirement? *Doing a search on water supply for M20 showed where someone mentioned needing some sort of pressure restrictor. *My house water pressure is probably roughly around 80psi.

    Answered above. I dont speak psi anymore that was a long time ago, 350kPa as above.


    The drain tube appears to be a high-temperature-resistant, industrial strength tube. *Is there a specific heat requirement for the drain lines?

    No, but it is better to use a drain tube that has something like wire reinforcing in it so that the warm draining water from the drip tray doesnt collapse the drain tube and cause a blockage that will leak everywhere from the collector box under the drip tray when it backs up...


    Am I correct in assuming that a cold line feed is all thats needed? *No need to send hot water to the unit, is there?

    Yes cold water only. DO NOT connect hot water to it.


    Sorry cant supply an owner booklet but you can take solace in the fact that they usually contain very little that could be helpful to someone who is new to a commercial espresso machine...ie wont be understandable
    a) from a technical ie "how to use" point of view and
    b) because the Italian to English translations are seldom any good hehe.

    Good luck,
    FC.


  4. #4
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    Re: Help with La Cimbali M20 1-group Setup

    Hehe JavaB, u beat me by 41 seconds!

    Ragardz,
    FC.

  5. #5
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    Re: Help with La Cimbali M20 1-group Setup

    Wow, you guys are fast! :)

    Thanks for the tips.

    Combining the two comments, it appears:

    [list][*] Water inlet size might not matter, but its probably better to stick with a larger diameter.
    [*] Pressure does matter. Thanks for the specifics (and the conversion - yes, Im in the antiquated US, with our old English measurements).
    [*] Standard PVC plumbing should be adequate for carrying the drainage, as long as it can stand up to ~100 degrees C. For flex-tubing, the kind with the metal wrap (which is what came with the unit) is suggested to avoid heat causing warpage-->pinched-->clogged drain line.
    [*] Cold water only
    [*] I plan on using a 220V circuit with 10/2 wire and a 15A circuit breaker.
    [*] JavaB, Id like to take you up on your offer for the manual PDFs. Ill send you my email offline.

    Ill try to let you know how it goes.

    Cheers!
    Dave

  6. #6
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    Re: Help with La Cimbali M20 1-group Setup

    Behmor Brazen - $249 - Free Freight
    Quote Originally Posted by JavaJunkie007 link=1164951907/0#4 date=1164954400
    [*] I plan on using a 220V circuit with 10/2 wire and a 15A circuit breaker.
    Youll need a 3 conductor plus ground wiring harness for the 220v connection unless its an older model with no grounding wire. As far as I know the National Wiring Code still says 14ga is rated for 15 amps with 12ga being used for 20 amp circuits and 10ga being used in 25 and 30 amp circuits. Even if the M20 does not have a 4 wire connection the last time I checked the national building code standards still requires the 3 conductor plus ground connection between the main panel and the outlet.

    I would also double check and verify that the unit only needs a 15a circuit rather than a 20a one.

    A word of warning on the cold water line hook-up. Do not use the cheap poly tubing as seen in most ice maker and water filter hook-ups. It is not designed to deal with the heat it will be subjected to underneath the espresso machine.


    Java "Hhhhmmm....Cimbalis!" phile



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