Cycle Time

MikeBos

I cringe every time I hear my Buderus G115WS/4 cycle on for 1-2 minutes and shutdown after the thermostat stops calling. This can happen multiple times an hour. Mainly happens when the in floor thermostat calls for heat to maintain 70f. Struck me that maybe a thermostat might include a setting that would allow me to define the minimum call cycle time. So instead of 1-2 I would set it to run for 5 minutes regardless if the floor was still in need. I have the diff for the aquastat set at 30f and high at 170f so floor only fires the boiler if boiler is less than 140f. Does any of this make sense? On the other side of things I'm still considering a buffer tank but that is lots of $$ whereas a new thermostat is not lots of $$. THX

Jamie Hall

Does your in-floor thermostat have any settings on it, such as cycles per hour or swing? It's clearly not functioning as it should, and there may be settings which aren't correct.

MikeBos

I have these thermos https://www.watts.com/products/hvac-hot-water-solutions/controls/thermostats/519 . Not a lot of settings . max and min floor temp. Not much more

MikeBos

I'm just reading thru https://forum.heatinghelp.com/discussion/153588/gshp-short-cycle now. I'm going to try to turn off the floor sensor. The sensor is in https://www.watts.com/products/hvac-hot-water-solutions/floor-heating/floor-heating-accessories/smarttrac-panels

MikeBos

@Jamie Hall Would you mind explaining how it is so obvious it is not functioning as it should? My observation has been all along that my Buderus is over sized for these micro loads. I just recently considered that the thermostat might help to get my G115 to a more efficient burn time. Is there an alternative Thermo that I could consider that might have the settings to help avoid the short cycling?

EBEBRATT-Ed

If your boiler is over sized you need a buffer tank. But you already know that.

Put an aquastat or thermostat or sensor on the loop and set it with a big differential. That's all you can do without a buffer tank. Unless you can down fire the boiler

Your making more heat than you need it has to have some place to go

mattmia2

I assume there is a mixing valve that tempers the water for the loop? Perhaps you could lower the loop temp to make it run longer calls.