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Navien Domestic Hot Water Heater Integration

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#1 giesen


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Posted 23 June 2018 - 09:25 AM

I recently purchased an NTI GF200 Furnace ( https://www.ntiboile...ucts/GF200.html ) which includes an integrated Navien NPE-240A instant hot water heater ( https://www.navienin...oducts/npe-240a ).

I'm looking to integrate control of the hot water heating functions (temperature and recirculation control, access usage data, diagnostics) with my ISY994i. They offer a kit called NaviLink ( https://www.navienin...sories/navilink ) which plugs into the unit and appears to communicate via RS485.

There don't seem to be any docs describing the RS485 protocol or an API for the NaviLink unit that I could find. The NaviLink doesn't even seem to have a web interface that I could scrape (judging from the manual, access is only via smartphone).

I've reached out to both NTI and Navien to see if they're willing to provide any information, but I'm not hopeful.

What I'm wondering is if anyone has integrated with one of these units either directly without the NaviLink unit, using RS485; or through the NaviLink unit?

Edited by giesen, 23 June 2018 - 09:26 AM.

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