New member here and want to start off by saying this website is phenomenal. You are all such an asset to anyone willing to just try and understand their system before wrenching away.
Now, onto the entree;
I have a small 100 year old four story 12 unit property, two adjacent buildings with one ~20 year old boiler (read as long steam main runs to risers).
As of a year ago, we have upgraded to the entech boiler control, with space temp sensors and a bunch of sensors for flue temp, dhw(aqua/coil/mix temps), return, pressure and outdoor readings.
As of now the system typically takes approx. 20-30 minutes to build 1PSI, then continues to do so as normal, up to its current settings which cut out at 5-6PSI and then restarts if target temp is not achieved. I'd like to try and optimize my settings and operation but before doing so want to ensure i fully understand what to do and what to expect from its operation. Some background, i have begun insulating the horizontal main runs with fiberglass wrap, they are approx. 40ft long x 2.5" pipe, risers are 2" pipe buried in walls and in some places exposed within apartments. The boiler also provides dhw with two 10gpm tankless coils through a 1.25" watts n170-m3 mixing valve.
I have changed out the two old and leaky hoffman 75 main line vents with Barnes & Jones Big Mouth Vents and the risers at the top most point have a drilled and tapped hole with a #D 1/8" Angle Air Valve (four risers, each with #D vent).
So, my question is the following, What does it seem like i can do to get heat faster or more economically. Is there anything that can be done for dhw - perhaps this mixing valve is not properly sized or is dhw with steam boilers just a picky issue in general. Alternatively, if this is good enough of a setup it would also be ok with me. The boiler room naturally is a small basement space with beautifully narrow halls and access. Also, if posted in the wrong category, i do apologize. I've spent a couple days searching and have been trying to piece together more info.