You're probably referring to the section regarding a domestic hot water tank used w/a backflow preventer.
Some municipalities now require a backflow preventer on the water main entering the house. If you had one- and you heat your domestic hot water to 140F that would build dangerous pressure in your domestic water system- so you use an expansion tank specifically made for domestic water pressurized to 70+ PSI on the cold side of the DHW tank and that adsorbs the pressure buildup.
Even though your boiler expansion tank isn't ideally located- it will function, and your boiler fill backflow preventer is installed correctly.
That info was just under backflow preventor and didn't mention anything about dhw. I'm ok with where the expansion tank is if the warranty is intact. I'll have to get clarification from HTP as we aren't using it for dhw. Attached is a photo of the part of the manual im looking at. (Bottom part)
Rob, can you post an up close picture of your vent for the condensate line? I'm assuming they didn't use it due to the gas pipe being right under it. Doesn't seem like it would fit the vent with their tube without bending it/creasing it. The plumber said the pump being vertical was fine due to 20psi or more but taco just responded to my support inquiry stating that model has to be horizontal and if we used an 007 it could be vertical with 20psi.
Leon, both my rinnai and HTP do not have a neutralizer due to it pumping into laundry drain and the soap neutralizes it.
I'll have to call them back and have them fix the pump as it voids pump warranty and I hope they still have the original drain that came with the HTP.