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Hi,customer wanted Navien Combi ch 240. We installed boiler as per manufacturers specs,primary/secondary,sch80 on exhaust,etc.
So the boiler has been running for a couple of weeks now and customer is very happy which is great.I asked a heating consultant I know to come and calibrate the boiler and test for efficiency.
By the way there is two heating zones with a taco switching relay and room thermostats.
Boiler was running at 83% eff.it condensed a little on fire up but after a few minutes it stopped condensing.So we installed ODR.Now boiler wont fire.
We call tech support.It appears you cant use the odr if you are using two zones .We are told that the remote control that comes with boiler has to be used as the room thermostat and then the odr will work as long as you have only one zone.
I went to a Navien class and this was never mentioned,we were actually told to put the remote inside boiler away from the homeowner.
I am not here to knock Navien,I would just like to know if anyone has had a similar experience or is there a way to correct the problem because right now I do not have a condensing boiler.