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In this Discussion
After the old forum software breaking in a way that we were unable to fix, we've migrated the site to a new platform.
Some elements aren't working as we'd hoped - some avatars didn't survive the transition, and we're still having issues with attachments that weren't added as inline images, but we're hoping to have that all sorted out soon.
Some elements aren't working as we'd hoped - some avatars didn't survive the transition, and we're still having issues with attachments that weren't added as inline images, but we're hoping to have that all sorted out soon.
Lever Machines running from mains or tanks supply
This doesn't have a particular point or a focus on any specific Lever machine. It also should be read knowing that the requirements for HX based levers are different to dipper tube levers in their requirements.
Based on some chat over the new Bezzera Strega (including some ill informed speculation elsewhere) and some practical hands on first hand knowledge of running Lever machines on Tanked supplies that were designed for mains and vice versa and with a 15 year background in pumps here is a place to chat about getting water into your lever machine. Also to dispel one of the principal reasons NOT to buy the tanked Strega and convert it to plumbed in (obvious warranty issue aside).
Levers can be run successfully on tanked or plumbed in supplies.
1: Water supply pressure requirements are just over boiler pressure so say circa 2-3 bar is heaps.
2: Volume requirements vary from machine usage but even at 5-6 double shots a minute with steam on my 3 group that is under 1 l/min.
So from these basic specs any of the 240V Vibe or Rotary Vane pumps will generally used in coffee machines will nail it for the pressure requirements and unless you are running a multigroup hard then even a vibe pump will keep up with a lever.
The biggest pet hate of mine is that sort of pump won't suck water from a tank. PUMPS DON'T SUCK !!! Without getting into detailed discussions on NPSH or fluid calculations consider pumps when primed being capable of drawing water from tanks under a counter with Vane Pumps being better at this job than vibe pumps. Vertically the metre or so shouldn't be an issue if you fit a non return (check) valve at the tank outlet and fill the pump and line with water. A better plumbing arrangement is like a lot of tanked machines to have the tank above the machine and if that means mounting the pump under the counter then that is fine too.
insert pics here tomorrow
Based on some chat over the new Bezzera Strega (including some ill informed speculation elsewhere) and some practical hands on first hand knowledge of running Lever machines on Tanked supplies that were designed for mains and vice versa and with a 15 year background in pumps here is a place to chat about getting water into your lever machine. Also to dispel one of the principal reasons NOT to buy the tanked Strega and convert it to plumbed in (obvious warranty issue aside).
Levers can be run successfully on tanked or plumbed in supplies.
1: Water supply pressure requirements are just over boiler pressure so say circa 2-3 bar is heaps.
2: Volume requirements vary from machine usage but even at 5-6 double shots a minute with steam on my 3 group that is under 1 l/min.
So from these basic specs any of the 240V Vibe or Rotary Vane pumps will generally used in coffee machines will nail it for the pressure requirements and unless you are running a multigroup hard then even a vibe pump will keep up with a lever.
The biggest pet hate of mine is that sort of pump won't suck water from a tank. PUMPS DON'T SUCK !!! Without getting into detailed discussions on NPSH or fluid calculations consider pumps when primed being capable of drawing water from tanks under a counter with Vane Pumps being better at this job than vibe pumps. Vertically the metre or so shouldn't be an issue if you fit a non return (check) valve at the tank outlet and fill the pump and line with water. A better plumbing arrangement is like a lot of tanked machines to have the tank above the machine and if that means mounting the pump under the counter then that is fine too.
insert pics here tomorrow
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