Recent content by David Philips

Great, thanks Dana!

Tangentially related anecdote on baseboard with low water temps: NHB-80, main zone is 67' of Slantfin 30 baseboard. The current ODR curve raises indoor temp about 1º per hour while zone is calling for heat (on/off cycling is triggered by T-stat). At 48-50F outdoor temp, boiler setpoint is ~100F...

I spliced the aquastat line so it runs to both the boiler CN12 and to the Taco relay priority zone TT. Now the Taco relay knows to not run the other zone circs when the DHW is calling. When the DHW is satisfied, circulators for calling zones are powered and boiler temp drops back down to ODR...

Taco relay has jumper between zc-zr. Boiler cn10 (TT/ CH) is connected to Taco isolated end switch (X, X). Boiler cn12 (TT / DHW) is not connected to Taco (indirect aquastat is connected directly here). Adding a connection between this and the Taco priority zone TT (while keeping the aquastat...

I realize this is too late for the OP, but I came across this thread while searching and thought this might be helpful for others with this problem. I had the same issue with my install (Navien NHB-80, Superstor Ultra 45 indirect, Taco zone relay, and three Taco 007-F5 circulators: two heat...