Last fall I became a trustee in my church in northern NY, and was immediately assigned the weekly task of 'purging the schmutz' from our newly installed Weil-McLain LGB-8 boiler. Since then I've learned a few things about steam from Dan Holohan videos and this website. While I have questions about why the contractor set the boiler-cutout at 5psi, my immediate problem is a condensate return pump that is not working.
After noticing make-up water being added to the boiler before I purged it, I eventually found a 'stuck open' steam trap feeding an inoperative condensate pump. The condensate was spilling out the overflow pipe into a drain, along with filling that storage room with plenty of steam. The pump motor does not run. It is energized, but the motor doesn't start by itself. Though I can spin the motor 'by hand' using a screwdriver, it turns easily.
The thermal overload protection was cycling the motor coil on and off. I did de-solder the start capacitor and test it with an ohmmeter. As best I can tell, the capacitor is still good (high resistance, slowly decreasing to low resistance).
At this point, I think the start-circuit centrifugal switch is bad. Given the high heat in the room and the (weeks or months) of thermal overload cycling, I think the motor may need to be refurbished & tested, or replaced.
Unfortunately I cannot figure out how to remove the motor from the pump. Considering its age, and rust/decay, I hesitate to get aggressive with it. I don't have a parts diagram that could suggest how to disassemble the unit. We have tried applying WD40 to the head-to-case capscrews and they can be loosened now. But the motor doesn't seem to want to come out.
Given our church's financial situation, made worse by covid, I'd like to see what we can do ourselves before having a contractor tackle this problem. I fear they would suggest replacing the entire receiver, pump and motor assembly. Though that might ultimately be the best thing, given its rusty condition.
Another option is maybe I could install an electronic motor start switch, something like a Samusco ECS112PS . Would this be a bad idea? We just need a few more years of life out of this setup.
Thanks in advance for any suggestions!
Its a Hoffman Watchman WC-8-20 12 GPM 20 PSI pump.
With a Westinghouse 1/3 HP SF 1.35 NP45053-A motor:
Locked KVA - K
Thermoguard type A
Here are some pictures, and a video of my discovery.. The motor is hotter than the receiver https://photos.app.goo.gl/6CJ8Aq8zh8ZAXVGU9