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Gaggia TN to TD conversion: HX Injector tuning
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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, 1:53pm
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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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 290
Location: Americas
Expertise: I like coffee
Posted Fri Nov 22, 2013, 9:31am
Subject: Re: Gaggia TN to TD conversion: HX Injector tuning
 

The ideal temperatures (and profile) delivered to the coffee depends on the coffee and your taste.  Try an above grounds temp of 93C dropping to 90C at the end of brew.

The electric group heater should give you some control over the early brew temp.  Ie, bump it up or down a little.  But I expect that you will still need a very accurate HX temp.

Let us know how consistent you get it with the normal variations in ambient temp, supply water temp, boiler temp, flow rate and exact flush time.
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