Stack temperature

bink

I have a Buderus G115/4 with Beckett nx burner. The nozzle installed is a .75 x 60 b. When this was installed in 2015 the techs measured stack temperature of 300 degree f. Today the tech said it was 350 degree f. Efficiency was around 84 %. He used manual
equipment not testa. Is there a problem with the set up . I called back and am waiting for a call back from the tech. What information should i ask for when he calls?
Thanks for any advice.

EBEBRATT-Ed

Stack temperature will vary depending on the the temperature of the boiler room when the test is taken (ambient temperature).

Ask him for stack temp
efficiency
ambient air temperature
Co ppm
Co2 %
02 %

I wouldn't be concerned with 350 if all the #s are good and he cleaned the boiler properly. 300 is actually a little on the low end

bink

Ok thanks for reply and advice

STEVEusaPA

Draft and excess air also are a factor in stack temperature measurements.

HVACNUT

If he doesn't have a digital combustion analyzer that can print a report, then I wouldn't bother getting him back. Find another company.
Did he do a smoke test and check/adjust draft? Should be -.02 breech on the G115.

newagedawn

buderus are like new cars takes time to break'em in, not surprised the stack temp went up alittle, you'll be fine i used the old school combustion kit till about 5 yrs ago, never had a problem but digital combustion is so much easier,lol