Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
I have a new customer who has a large building with air handlers some in the attic and some wall units, but all are coils and fans, the boiler is a New NTI TFT 175. The whole thing works very well, except one problem. It cycles, a lot. The heat loss on the building is 110K it has 25% Glycol mixture due to the attic piping, the boiler outputs around 140 minus the glycol effect. I stopped in yesterday, (it was 40 degrees outside) and what I found was the main auditorium which has 1 sensor that tells the Honeywell Tstat the temp, (which doesn't seem to have a built in differential) basically drops maybe a half of a degree (the stat set for 69, calls at 69) and calls for heat. The boiler is set for a anti short cycle of 5 minutes, the stat calls every 5-10 minutes. This cycles the boiler A LOT. I made the adjustment to the anti cycle to push it to 20 minutes, now when the stat calls the boiler won't start but gives off it's left over temp and that is typically enough to satisfy the call. The problem is the boiler the runs for 2 minutes every 20 minutes, to satisfy a minor call at least at 40 degrees outside and that drives me crazy. I want to be able to adjust the ASC for occupied and unoccupied, if I could then I could do a solid hour on the ASC during unoccupied which would allow the boiler to run a bit longer and catch up. The boiler control can't do an unoccupied and occupied. My fear is during occupied that a long ASC would make it blow colder air on people and the complaints will be endless. Should I do a tekmar or a Buffer? I will be changing the auditorium thermostat to find one with a 2 degree differential and adding a couple of sensors to allow it to average better.