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Resurrection of a CFEI 100 KVA Induction Furnace

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John Rudd:

--- Quote from: russ57 on April 03, 2020, 05:26:06 AM ---A diy regas? Depends I think on what the gas is.

-Russ

--- End quote ---

If you can buy the gas...

Sea.dog:
You didn't state it explicitly, But I assume that when you first connected with the phases wrong that the compressor did work, is that correct?

If so it's strange that simply reversing the direction has caused it to fail.

awemawson:
Graham I think the phase reversal was just co-incidence as the starting current was pretty massive. Not sure how these sealed units operate - this one is apparently a four cylinder model - but years ago it definitely worked with the phases connected such that the pump and fans were spinning in the correct direction.

Recently before it failed, and with the Grunfos pump and fans spinning the wrong way, the refrigerant unit was working and cooled the water tank from 8 degrees down to 3.5 degrees. So I'm not sure how the internal pump in the sealed unit works. Reading the manufacturers documents they are NOT sprinkled with dire warning re direction .

The internal motor has failed I'm sure evidenced by the enormous current it's drawing (90 amps on two of the phases!) so sadly it's a bit more than just re-gassing it .

Sea.dog:
That's really bad news, Andrew. I've no idea about the internals of this type of pump, but I'd assume they're a reed valve or something similar, so direction shouldn't be an issue.

I stand to be corrected.

awemawson:
I understand that the sealed unit compressor / coolers have an oil charge and a gas charge within the envelope.

When I re-built the Grundfos pump there was a tide mark of 'something' that had dried to a hard varnish like substance (indeed I think that's what did for it's seal & spring) and I'm just getting this nagging doubt whether the immersed bit of plumbing in the water tank from the compressor unit has sprung a leak, released the oil into the water which over the years evaporated leaving the varnish tide mark.

This would of course explain the demise of the compressor (no oil) but if this is the case I'm surprised that it did actually chill the water and I was not aware of masses of  bubbling in the tank from an alleged leak.

. . . this is forensic engineering !!!!

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