So I have this woodstove…a great way to heat the house. Wood is cheap when Ma Nature provides it in the form of deadfalls and storm damaged wood and all you have to do is cut it and split it and I generally need the exercise I get from cutting it and making it into firewood and stacking it and moving it….
The stove has a heat exchanger and a fan and is tied into the forced air (gas) heating system, and it makes it pretty easy to keep the house warm. Very efficient: the fan cycles on and off as the firebox temps go up and down. EGT has to be beyond 250F or so and then the fan blows air through the heat exchanger until everything cools off….so you control the house temps with the fresh air damper. Pretty simple and you can get a load of wood in the firebox to last about 7 hours and keep the house nice and warm on a cold night….and keep the chimney hot enough to not creosote up.
So the other night, the outdoor tamps were near zero F….I filled the stove up with wood, set the damper to a really low burn rate, and then I went to bed about 11:30 (yeah, I know, what happened to the party animal that was once me on a Saturday night?) and fell asleep shortly thereafter…..and something woke me up about 12:45…I wasn’t sure that it was that woke me. But I was wide awake. I got up, looked around the house, could find nothing amiss, and went back to bed about 5 minutes later.
just as I started to drift off….Bzzzzerrtttt!…. then silence.
“Odd”, I said to myself: “That sounded like a stalled electric motor”…and the other voices in my head agreed that that is what it sounded like…I waited a few minutes, and there it was again….Bzzzrrtt!
I got up and checked the kitchen fridge, then the garage heater (turned on ’cause the elderly abandoned and abused cat that lives outdoors was inside due to the forecast below zero temps)…then the garage fridge, then the downstairs chest freezer….and found nothing, all seemed to be good….then, as I was fixing to go back upstairs, I heard it again. For sure a stalled electric motor.
Yep, it was the stove fan. It is a belt drive setup that turns a squirrel cage blower. I turned the switch off (I put isolation switches on nearly everything like that…..Good practice for such events… There is one for the gas furnace too) and tried to turn the motor….nothing seemed seized. I rolled the drive belt off the pulley, and both the blower and the motor seemed to spin freely.
About that time, I heard the “click” as the thermal cutout reset itself. I turned the isolation switch back on on and sure enough, the motor just sat there and buzzed, loudly…no rotation, even with no load. I turned the switch off, spun the motor pulley by hand and turned the switch back on,,,,and the motor spun. I let it run for a few, and then turned it off. It spun down slowly, not a bearing issue….as it slowed, I flicked the switch back on and it spun up again back to speed….let it spin down to a stop (which it did smoothly, so, again, probably not a bearing/bushing issue…I heard the centrifugal start switch click as it spun down….when it came to a stop I tried to restart it, it didn’t spin…..just buzzed .
So I dunno, a bad start switch? A start winding? It is an old Westinghouse 1/3 HP 1725rpm 48 frame motor….It was old and used and of unknown history (but good condition) when I put it on about 15 years ago to replace the totally trashed Emerson that was there before. I had oiled it and cleaned it but nothing else over it’s life on my woodstove…
I fully closed the damper on the woodstove to starve the fire of air and turned up the gas heat and went back to bed.
Sunday morning I went to the place where I had the spare (used) motor and found nothing. just space…. I may have put that motor in a different blower for a friend last year when his went out during particularly cold week or maybe I used it on the electric concrete mixer or….who knows?……..but I never replaced it. Not sure. All I know is I have no spare. (Which is unusual for me)
Shit.
Amazon has a cheap chinese replacement for $99 on two day shipping, so I bought one. I have no idea of the quality of a cheap chinese made Amazon $99 clone of an Emerson motor. It might be great, it might not last a month. ….And I don’t know it the Westinghouse motor is worth repairing, but I will take it to the motor repair shop today and see. The Emerson or Marathon replacement is $350 or so. The Dayton from Grainger is over $500. I might have a replacement stashed in the pole barn, but I don’t think it is the right mounting/frame type…and I might not even still have it either. Have to go look for it and dig it out and see…But right now it is -2F so that might wait a day.
We shall see.
In the meantime I burn natural gas like a normal person.