Announcement

Collapse
No announcement yet.

How do you prep a used semi-commercial machine?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Re: How do you prep a used semi-commercial machine

    FC - I was lucky enough to get mine in a running and excellent condition and was able to pull shots and steam before buying and got it for a steal. Took it home plumbed it up and with some mucking around with the plumbing got it working as it had been but with a new water filter and softener....and to replace the machine as it stands with a new version (that looks identical BTW) would cost me thousands ++. So I was lucky, but most people I guess would not get the opportunity to buy a used, well loved commercial - most are probably in need of some attention. I agree though with Dennis that a lot of people buy to restore. Having said that if you can get a commercial machine for what you might pay for a Silvia say, that is really just plug and go then more power to you.

    Cheers

    Comment


    • #17
      Re: How do you prep a used semi-commercial machine

      I cant wait to get my paws and dremel toolkit sledgehammer(oh that last ones for silvia) pull the sucker apart wonder what the hell Im doing then put it all back together again, hide the parts that were left over and flick the power switch and wonder why the lights went out,
      but seriously being the insanely curious person I am, a project machine just like project motorbikes Ive pulled apart and put back together(which can do some nasty things to your anatomy if you get it wrong) and had them checked then rode them is the best feeling if you are so inclined, having said that its not everyones bag.
      Most might be happy to spend large and flick power presto theres coffee.

      I do have one question about the pump on htese 2-3 groups obviously theres some mechanism beit magnetic switch microswitch or whatever, how can you tell if the boilers got water and when the pump will kick in. Will a machine automatically start the pump? Yes one of those how long is a piece of string questions,

      also
      the 15amp puppies, does reducing the amount of elements connected ie removing 1 out of three really drop the amps to 10? Im assuming that the current needs to be checked and you cant just pick off one at random can you?

      Yes there was a serious question in my usually usless post

      Comment


      • #18
        Re: How do you prep a used semi-commercial machine

        Sullo, with many of these machines there is a sight glass where the water level is visible.

        They also are likely to have an autofill probe so that as the water in the boiler drops, its automatically refilled to level.

        Yes, you can drop the amperage down by disabling one of the elements.
        I havent noticed any corresponding drop in performance .

        Get your Dremmel ready. Better still, put it away and get your open-ended Sidchrome spanners ready, along with a couple of screwdrivers and a mltimeter wont go astray either.

        -Robusto


        Comment


        • #19
          Re: How do you prep a used semi-commercial machine

          Ever since my lung collapse I had to stop riding bikes and trying to repair them
          My trusty spanners will breathe life again
          IGOR FLICK THE SWITCH!

          So without seeing a circuit diagram or exploded view of one, would I be correct in thinking that it really wouldnt matter which element or could that be more machine dependent? And how can you verify if youve not seen the pump in action that its working, is there a way to test the auto refill switch without damaging the elements?

          Comment


          • #20
            Re: How do you prep a used semi-commercial machine

            Sullo,

            Yep, my passion is the DIY bit as much as the end result.....

            Not only does MY machine make great coffee, but I RESTORED it into a state where that is the result..... and for me that is half the fun.... but not everyone is like me.....

            The pump detects water level in the boiler by one of two main methods:

            The most common is the level probe.... a probe which passes through an insulated gland into the boiler. The tip of the probe when it touches the water completes an electrical circuit and shuts of the pump (or if you like, when the water level drops it opens the circuit and switches on the pump to fill the boiler..... The level of water is adjusted by inserting or withdrawing this probe.

            The problems with this type:
            1......If you use distilled/demineralised water the water wont be detected and the boiler will keep filling.... until the pressure relief opens (the pump is supplying 9 Bars..... the OPV opens at less than 2 Bars..... and that sprays water everywhere inside the machine - not good!

            2......If scale builds up on the level sensor it wont conduct enough to sense the water same happens as in 1 above.

            The other type uses a float with a magnet in the boiler and a reed switch on the outside to detect the level.... as the float rises the magnet comes closer to the reed switch.... and the motor is switched off. The La Cimbali has this type....

            Less problems with this type.... water can be pure and the float wont care..... You can get scale build up on the float which will affect the level a little... but not as drastic as the type above.

            Water level is adjusted by moving the reed switch...

            OK heaters..... Commercial machines have 3 heaters (so they can be run on 3 phase) .... so using mine for example.... 4000 W total heater power...

            Each element uses 4000/3 watts or 1333 Watts.... to covert that to Amps devide by the voltage (nominally 240V here in Aus) so 1333/240 equals 5.6 Amps for each heater....

            On three phase the heaters will draw 5.6 amps on each phase.... or if wired for single phase and all heaters in circuit it will draw 16.8 Amps.... plus there is the pump.... normally about 300W... starting current is higher so lets say an additional 2 Amps..... All up 18.8 Amps .... so I have a 20 Amp run....

            Now if I disconnect 1 heater Ill have 11.2 Amps for heaters and 2 Amps for the pump.... total 13.2 Amps.... sweet on a 15 Amp outlet...

            Disconnect 2 heaters..... The machine draws 5.6 Amps on the heaters plus the 2 Amps.....7.6 Amps.... which is fine for a single normal outlet...

            So From the specs for the machine (on the plate attached) you can calculate how many heaters you can afford to run for a given power point type....

            The "cost" of using less heaters is slower warm up time and slower recovery between shots.... neither of which will be an issue - unless running a cafe at home.

            Comment


            • #21
              Re: How do you prep a used semi-commercial machine

              Sullo,

              Most if not all commercial machines have a sight glass as Robusto commented above.... and have a two position power switch.

              The first position is everything other than heaters.... if the water in the sight glass is at the correct level.... nothing will happen.... if too low, the pump will start (you will hear it) and run until the water level is correct and then stop.... If it doesnt see my earlier answer.

              Once it is at the correct level - and the pump has stopped.... switch to position 2 and the heaters will start heating the water....

              Comment


              • #22
                Re: How do you prep a used semi-commercial machine

                thank you for explaining that Ive been going thru parts diagrams from CPs site,
                so a unit thats plate reads 3000W would be 12.5, three heaters with one disconnected would be approx 8.4 plus 2 for  the pump. could that be run on 10amp household socket? Although Id prefer to have the 15amp circuit run thru so I dont fry the 10amp rated wiring, that correct?

                Comment


                • #23
                  Re: How do you prep a used semi-commercial machine

                  Sullo,

                  That is spot on.... a smaller machine will also have a smaller pump.... so my 300W monster will not be in most machines.... so 2 heaters plus pump would almost certainly be less than 10 Amps

                  Household wiring is 15 Amps (most modern houses are 16.8 Amps).... the outlets are only designed to supply 10 Amps.... you wont fry your house wiring...... the fuse (just as long as you havent put a nail in the holder instead of a wedge / breaker : :) will blow well before the line fails.

                  Comment


                  • #24
                    Re: How do you prep a used semi-commercial machine

                    You have to hear the pump of course.

                    Autofill: disconnect the ground wire from the probe and the pum should start pumping. Ground the wire --on the probe or any metal-- and it should stop. Though some machines, I believe, can bypass the pump by opening a solenoid and allowing mains pressure to do the job. There may also be a manual valve you can use to fill the boiler without using the pump.

                    You may -- as I did -- work out which element to disable. My machine has direct feeds to some of the terminals, and jumpers from one terminal to another. I removed a jumper, thereby taking that element out of the circuit. A DMM may come in handy here.

                    If its a volumetric unit, make sure the soft touch pads work. Replacing the computer, or the pads, can be expensive.

                    Flowmeters are about $160 each. So its preferable that all works.

                    -Robusto
                    -Robusto

                    Comment


                    • #25
                      Re: How do you prep a used semi-commercial machine

                      thanks guys appreciate the help here, Ive emailed a few places to try find a parts diagram so I can investigate further before laying out the cash,
                      Im sure I can hear my tools getting excited already at the thought. My day job although Im called a technician most days a trained monkey could do my job, then again thats what they pay for....
                      Just figured out that the machine Im currently looking at is rated at 3000/single phase, I dont wanna be messing with 3 phase! All that electrickery n all.
                      Cheers
                      Steve

                      Comment


                      • #26
                        Re: How do you prep a used semi-commercial machine

                        Off topic replies have been moved to [link=http://coffeesnobs.com.au/YaBB.pl?num=1186397419]This Thread[/link]

                        Comment

                        Working...
                        X