Hi,
I'll start by saying I have site admin permission to post this thread.
As some of you may recall, I had posted earlier asking about a pressure switch. I was given a crash course on the importance of the pressure switch
as well as information on a possible other outcome for the no-heat situation, namely the secondary heat exchanger. That information is immensely helpful
as I was not aware of the settlement nor was I aware of the extended warranty on the secondary heat exchanger.
I was originally scheduled to have a service call later in the week but was put on the calendar today and the tech completed his inspection. He started by
turning the system on, which it did do. I was surprised it came on as I was not expecting it to, it also kind of annoyed me as I know from experience, it's
infinitely harder to fix something when it's working. He then went outside and smelled the air around where the vent is. He said he didn't smell the usual air
associated with a faulty primary/secondary heat exchanger.
He zerod his analyzer in the same space as the furnace, something Testo said not to do in their YouTube video.
He then tapped a hole in the pipe and inserted the probe of his Testo 310 analyzer. The readings are as follows:
o2 11.5%
co 34ppm
Fluegas Temp 95.1f
EFF 95.2 (is this efficiency?)
Ambient Temp 65.6f
Excess air 110.3%
co2 5.22%
Undiluted CO 77pm
Ambient CO and Pressure are blank.
He checked the heat exchanger drain, it was not obstructed. The switch on the side of the burner which he said has to be manually reset
if it trips was not tripped and I didn't even know it was there so I sure didn't reset it! He checked everything visually and didn't see anything else out
of the ordinary other than the inducer was missing a plug. He put putty over it to plug it.
So, the big take away for me is two fold....that my heat exchangers are ok. This is a big relief. Then second, the damn thing turned on for him.
There's nothing I love more than things working perfectly in the presence of the tech all the while it didn't work right up until then.
He did make one observation. Our A/C is a Trane. He said the carrier is a 17" wide unit and aside from a very small lip, the opening is essentially
the full 17" whereas the Trane, due to the coil positioning, is about 12". He said that drop is restrictive and could cause my limit trip issues.
He showed me a switch behind the inducer motor and said if the restricted airflow causes a problem, the limit switch will go open and I will see it
on my DVOM. He said it's also possible the upper area of the furnace will get hot of the airflow is restricted enough.
He didn't have a solution other than replacing the A/C unit or the furnace.
I asked him why then has it worked for the past 5 years....he equated that to how a 75 year old man can't do the same things he did at 25.
That the switch behind the inducer is just "tired".
Does this jive with you based on the information I have presented??
I'll start by saying I have site admin permission to post this thread.
As some of you may recall, I had posted earlier asking about a pressure switch. I was given a crash course on the importance of the pressure switch
as well as information on a possible other outcome for the no-heat situation, namely the secondary heat exchanger. That information is immensely helpful
as I was not aware of the settlement nor was I aware of the extended warranty on the secondary heat exchanger.
I was originally scheduled to have a service call later in the week but was put on the calendar today and the tech completed his inspection. He started by
turning the system on, which it did do. I was surprised it came on as I was not expecting it to, it also kind of annoyed me as I know from experience, it's
infinitely harder to fix something when it's working. He then went outside and smelled the air around where the vent is. He said he didn't smell the usual air
associated with a faulty primary/secondary heat exchanger.
He zerod his analyzer in the same space as the furnace, something Testo said not to do in their YouTube video.
He then tapped a hole in the pipe and inserted the probe of his Testo 310 analyzer. The readings are as follows:
o2 11.5%
co 34ppm
Fluegas Temp 95.1f
EFF 95.2 (is this efficiency?)
Ambient Temp 65.6f
Excess air 110.3%
co2 5.22%
Undiluted CO 77pm
Ambient CO and Pressure are blank.
He checked the heat exchanger drain, it was not obstructed. The switch on the side of the burner which he said has to be manually reset
if it trips was not tripped and I didn't even know it was there so I sure didn't reset it! He checked everything visually and didn't see anything else out
of the ordinary other than the inducer was missing a plug. He put putty over it to plug it.
So, the big take away for me is two fold....that my heat exchangers are ok. This is a big relief. Then second, the damn thing turned on for him.
There's nothing I love more than things working perfectly in the presence of the tech all the while it didn't work right up until then.
He did make one observation. Our A/C is a Trane. He said the carrier is a 17" wide unit and aside from a very small lip, the opening is essentially
the full 17" whereas the Trane, due to the coil positioning, is about 12". He said that drop is restrictive and could cause my limit trip issues.
He showed me a switch behind the inducer motor and said if the restricted airflow causes a problem, the limit switch will go open and I will see it
on my DVOM. He said it's also possible the upper area of the furnace will get hot of the airflow is restricted enough.
He didn't have a solution other than replacing the A/C unit or the furnace.
I asked him why then has it worked for the past 5 years....he equated that to how a 75 year old man can't do the same things he did at 25.
That the switch behind the inducer is just "tired".
Does this jive with you based on the information I have presented??
source https://hvac-talk.com/vbb/showthread.php?2223941-Follow-up-to-no-heat-with-Carrier-58MCA080&goto=newpost
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