skydragondave Senior Member Joined: 18 Feb 2013 Posts: 167 Location: Ontario, Canada Expertise: Professional
Espresso: Commercial Only Grinder: Commercial Only Roaster: Has Garanti HG5
Posted Tue Nov 19, 2013, 12:53pm Subject: Gaggia TN to TD conversion: HX Injector tuning
Hi all, Wondering if anyone can help me. I've got a TN machine designed for Nespresso pods in my shop and I'm evaluating it for conversion to conventional groups. The groups themselves are still available and less than $100 each, and the boiler is the same capacity as the TD Compact (4.9L), but the heat exchanger tubes in the TN boiler run longitudinally whereas the TD boiler exchangers are shorter and running transversely. What I'd like to do is alter the length of the injector pipes (if necessary) to get the temperature profile required during brewing. Does anyone have a graph showing what the temperature needs to be over time so I can get these HXs dialed-in reasonably close? The TD/TE groups use a plug-type heating element in the group head and a single feed pipe rather than a true thermosyphon, so I'm hoping th eelectric group head temperature regulation will make it less critical to get a super precise HX temperature. Thanks for any advice. Cheers
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