Ok Ok. So I'm a little behind. I live just outside Scranton, Pa and I fired up the burner for the first time this season just yesterday.
I bought my house three years ago. I instantly fell in love with the coal heat. I was just learning how to work the Harman and would frequently starve the fire or accidentally let it soar to 500 degrees according to the stick-on magnet thermometer stuck to the box.
Through all that, my thermally protected fan never kicked off.
Then last season, I noticed that the fan would trip off often ( for my taste, at least ). I'd say that between Oct of last year thru March of this year, it kicked off 10 times (that I know of). Why? I don't like that.
THEN......I light 'er up last night. All was fine (I'm a pro with starting and regulating now). When I came down this morning to sit in front of it with my coffee........The motor kicked off right as I sat there! Temp gauge on the box read only 225 degrees. Inside the fire looked normal.......red bed with the dark top layer just doing it's thing. I felt the motor and yup, it was very hot!
I slide it out and put it on the back deck for 1/2 hour to cool it off.
It's back on right now and running. But I hate that it's kicking off! That isn't safe, is it? It certainly isn't heating my home well when it's off.
Here's the stats:
Fasco Centrifugal Blower model# 50752-D500http://tinyurl.com/ykd73k
This will give the dimensions
The dataplate says the motor is 2,800rpm and it has that model number, but the Fasco website says 135cfm @ 3,100rmp.
Is my model old and in need of replacement?
What should I do?
Gary in Pennsylvania