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wiring RMB-1 to OM-180


First, this is a basic closed radiant system heating 2 zones in a garage. I have an OM-180 boiler, then the RMB-1, then 2 zone values, and then the manifold for the larger zone and a single line for the smaller zone (back room).

I looking for advice as to how to wire my Taco RMB-1 to my OM-180. There is one boiler 2-wire connection on the RMB-1, but I do not know where to connect it at the boiler. The response from the Taco tech help is copied below.

From Taco:

The boiler contact are interfaced with the low voltage thermostat terminals usually located on the boiler aquastat relay. hopefully that helps; if you need additional information on the boiler, I suggest contact the boiler mfg. thanks

I do not see any thermostat terminals on the boiler circuit board. Any guidance here would be great.

OM-180 manuals:

<a href="http://www.digelair.net/pdfs/TECHLIT/TOYOTOMI/HEATING/WATER/OM-180_INSTALL.pdf">http://www.digelair.net/pdfs/TECHLIT/TOYOTOMI/HEATING/WATER/OM-180_INSTALL.pdf</a>

<a href="https://www.toyotomiusa.com/OwnersManuals/Water%20Heaters/Name%20begins%20with%20OM/OM-180%20">https://www.toyotomiusa.com/OwnersManuals/Water%20Heaters/Name%20begins%20with%20OM/OM-180%20</a>(Type%20D)%20Operation.pdf

RMB-1 manual

<a href="http://www.taco-hvac.com/uploads/FileLibrary/102-151.pdf">http://www.taco-hvac.com/uploads/FileLibrary/102-151.pdf</a>

On page 10 of this manual, under "wiring the boiler", it states "Connect the Boiler relay in series with the control circuit of the boiler"

I just don't know where on the OM-180 circuit panel this should be.

Thanks for any guidance!