Hi, I've recently had a new boiler installed and had the exhaust lined with 6" flexible liner to update the heating in my home. The safety on the doiler keeps tripping every 20-30 minutes. My HVAC guy has no answer other than he thinks the exhaust liner needs to be increased from 6-7"
Bottome line is I've done what I could and I'm still not able to heat my house. Let me provide the details. Please give me some honest advice if you can. Thanks.
I live in an 1850 row house in Baltimore that was in pretty sad shape when I purchased it a few years ago. The boiler was circa 1930 and the exhaust dumped into an unlined chimney. Well the chimney collapsed, causing the smoke to vent into the 1st floor instead of up and out of the chimney.
I had the chimney lined and the contractor used a 6 inch flexible liner. It is about a 35 foot run up from the basement to the top of the chimney. A new furnace was installed a few weeks later, so now I have the following pieces of equipment exhausting up through this 6" liner.
Smith Boiler Model# GB 100-W-5-INTO
Normal Input 100,000 BtU/hr
Normal Output 83,000 BtU/hr
Rheemglas Imperial Water Heater Model # 22A1-402-1
Normal Input 38,000 BTU/hr
Normal Output - Not available
So after the new boiler was installed in late Feb last year everything went well. The boiler did shut off a few times for some unknown reason, but by an large everything ran smoothly through the latter half of the winter and the spring.
Within the last 3 months, the safety on the boiler has begun to trip out regulary. I would reset the boiler, and it would run for a day or longer at first, and more recently, it trips out every 20-30 minutes.
My HVAC guy suggested that the problem is that there are too many BTU's exhasuting out of my boiler and water heater. I countered with if that was the case then it should have occured last year as well.
To test this theory we shut off the water heater and the the boiler ran for about a day before it again tripped the safety. I am now back to resetting the boiler every 20-40 minutes in an effort to get the house to stay at even 60 degrees.
HVAC then suggested that their is a constriction of some sort in the exhaust tube, such as a bird etc or an internal collapse which has kinked the flexible exhaust piping. The top of the exhaust is capped so there is no opportunity for anything such as a bird to fly into the liner. I checked from the top down and I can see a collapse so I'm assuming the liner is undamaged.
Could this be a cause for a larger liner. If yes, why wasn't this a problem for 3-4 months last year.
If this is not the case, does anyone have any suggestions as to what could potentially be the cause of the safety continually tripping on this 1 yr old boiler?