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Combustion Efficiency Test On Old Large Boilers
Can someone please tell me where the right place to do Co2 test on an old large boiler. Yesterday I worked on an old American Standard A-5 boiler. The stack temp was 400. The co2 was 6.5. I drilled a hole in the flue before the regulator to do test. My chart says thats 76% efficiency. However it hasn't been cleaned in a long time. Last recorded test was in 1990 and then also reads 76% on the oil company's efficiency sticker. Some people told me on old boilers you do all the tests above the fire and not in a drilled hole in the flue pipe before the regulator. Others told me in the flue. The reason I feel unsure again is because on my own Peerless Jot 175 with Riello burner I recently got 575 stack and only after cleaning went down to 450. I feel the A-5 I worked on has its flue pipe coming out of the top of boiler like 5 feet above the flame. (its very tall) and thats why the stack is low temp. I can't believe not being serviced in many years, that its still same efficiency as 20 years ago.
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