Buderus G115 Water Temp

kevin coppinger_4

on the low side. is that just at start up? Sustained temp. that low would not be good.The 115 can handle better than many.Does the 363 have some boiler protection built in?
I hate to beat a dead horse as to the burner, but until riello get their act together w/ that post purge control I would not use that BF series burner...the Carlin EZ1-p10 is far better. It has been a long road for riello for everyones sake I hope they solve it soon. kpc

bruce pirger

Finally have the heat on! YAHOO!

Radiant slab application. Buderus G115-21 (61,000 BTU/HR), Riello BF3 (no purge cycle currently, jumpered out as it failed, awaiting replacement!) Primary/Secondary piping. Tekmar 363 control handles the direction injection mixing pump, the P/S pump (P1), the manifold/zone circulator (P2), and the DHW (plumbed off the primary secondary with it's own 010 circulator).

I love the 363 controller. I only wish I could easily connect it to my PC to record all the settings/temperature and make a nice long time plot...but the monitor functions are great (hours on burner, pumps, etc)

Slab sensor sets min/max slab temp and the 063 provides indoor temp feedback as well.

Boiler cycle average length right around 10 minutes.

I see my boiler temperatures range from about 150 max to some 100 min. The floor injection ranges from about 105 target to 50 or so when it exceeds the limit by a degree.

Should I be worried at all about the lower temps on the G115? I know many other boilers should be kept at more like 140 degrees min. The 363 is set to control the min/max on the boiler temperature in AUTO mode.

I know condensation problems can result with "cold firing" all the time. Should I be concerned?

Mike F

why did you use p/s piping? i was considering p/s for a mix temp job i was doing with a buderus. the rep talked me out of it. the main advantage of p/s is to keep the supply to return differential at no more than 20 deg. but the buderus can handle any differential as long as a min of 103 deg( i think) is maintained. i used the buderus logomatic control which shuts of pumps when temp is below 103. i also used motorized 3 way mixing valves controled by logomatic control with room and outdoor sensors. i think slab sensors are avaliable. the cost was significanty less than with additional p/s control and piping. just something to think about.