I have post about this before but did not have and solid numbers. Can't find my old post so here we go since i have all infor now.
I have a carier 59tp6 furnace 120btu in a 3500 house with io controls zoning system. Lately we been hearnig whistle like noise when furnace come on through the house. Last time it happen I went donw to the basement and took door off and listin.
1. inducer motor comes on - non noise, none
2. flame starts - noise is present, whistle like noise. once blower comes on it gets lost but still there.
So I had installing dealer come out and do test. they check gas pressures and look at the burner, but did not find anything out of ordinary. Here are results of the firs visit:
gas pressures
incoming: 7.3 w.c
manifold 1st stage: 1.6 w.c
manifold 2nd stage: 3.5 w.c
all with in spec according to the book and tech. did not get realy why is it making the noise from him. he left and sad his office will call me he will have to return. after reading more here I decide to call and ask for combusion analisys. Diffrent tech return and I was actually home today and watch him doing it. He drill small hole in the exhust PVC pipe and start his testing. from what i saw on the screen it started with him calling for heat, mesuring tool read 20.9%o2 and when burners started it start droping to about 11.1%o2, then i can hear blower comes on and numer still keep droping to 10.6%o2 for a split second. then number just stay there all the time maybe at times it went from 10.6 to 10.5 and back to 10.6%o2. i will attache pictures of the screen he let me take. also co2 stay at 5.8% when he look. He took pictures as well and sad that his office will call me with resutls after his boos looks at them.
We have not use heat that much but now since its cold we been using it more. I just want to have you guys look at it and let me know if there is anything to worry about. My contractor is not that bright I have to push him to do stuff to get anything resolve. I just want to make sure that my heat exchanger is fine. and what else can cause this wierd whistle.
Thank you,
I have a carier 59tp6 furnace 120btu in a 3500 house with io controls zoning system. Lately we been hearnig whistle like noise when furnace come on through the house. Last time it happen I went donw to the basement and took door off and listin.
1. inducer motor comes on - non noise, none
2. flame starts - noise is present, whistle like noise. once blower comes on it gets lost but still there.
So I had installing dealer come out and do test. they check gas pressures and look at the burner, but did not find anything out of ordinary. Here are results of the firs visit:
gas pressures
incoming: 7.3 w.c
manifold 1st stage: 1.6 w.c
manifold 2nd stage: 3.5 w.c
all with in spec according to the book and tech. did not get realy why is it making the noise from him. he left and sad his office will call me he will have to return. after reading more here I decide to call and ask for combusion analisys. Diffrent tech return and I was actually home today and watch him doing it. He drill small hole in the exhust PVC pipe and start his testing. from what i saw on the screen it started with him calling for heat, mesuring tool read 20.9%o2 and when burners started it start droping to about 11.1%o2, then i can hear blower comes on and numer still keep droping to 10.6%o2 for a split second. then number just stay there all the time maybe at times it went from 10.6 to 10.5 and back to 10.6%o2. i will attache pictures of the screen he let me take. also co2 stay at 5.8% when he look. He took pictures as well and sad that his office will call me with resutls after his boos looks at them.
We have not use heat that much but now since its cold we been using it more. I just want to have you guys look at it and let me know if there is anything to worry about. My contractor is not that bright I have to push him to do stuff to get anything resolve. I just want to make sure that my heat exchanger is fine. and what else can cause this wierd whistle.
Thank you,
