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Wilo Pump Capacitor Replacement

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Marko!

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Hi All, new member here.
I have a Wilo Gold RS50 pump fitted to a solar thermal system. I suspect the capacitor is faulty and wish to replace it. However, I cannot see the method to disconnect one of the capacitor leads (sited between the L & N connections). It is very tight and I don't want to damage the connection such that I cannot install the new one.
The other capacitor lead is held in with a clip and is easy to remove.
Any advice appreciated.

IMG_2621.JPG
 
Prob soldered to a board
 
Cheers guys. I can't think why they would solder one side in but not the other?? It looks just like it's pushed in but I don't want to yank on it too hard and potentially damage the connection. Unfortunately the orientation of the pump makes it difficult to access too. I would swap the pump but the main complication is that the system is pressurised and full of glycol. I was hoping a new capacitor would be an easy/cheap fix...
 
Any chance of a pic of the connector ?
 
Marko! said:
Cheers guys. I can't think why they would solder one side in but not the other?? It looks just like it's pushed in but I don't want to yank on it too hard and potentially damage the connection. Unfortunately the orientation of the pump makes it difficult to access too. I would swap the pump but the main complication is that the system is pressurised and full of glycol. I was hoping a new capacitor would be an easy/cheap fix...
Click to expand...

Because they may prefer to sell you the full pump , maybe .
 
TBH cut and strip the wires back and chock block them
 
YorkshireDave said:
No. Sorry Shaun. Use Wago blocks as both safer & reusable as cannot be overtightened.
Click to expand...

Too big by the looks of the space love wagos but size looks an issue
 
Be careful swapping capacitors fitted to motors because they need to be rated to both the correct capacitance and voltage for the application. You may find the back EMF effect of the motor may lead to stray voltages significantly higher than the 240v input.

On another tack, I don’t think I’d replace a anything electrical with a non OEM part. If the pump later catches fire etc (unlikely I know) you’re leaving yourself wide open liability wise. A judge would have you’re pants down.
 
OffshoreGas said:
Be careful swapping capacitors fitted to motors because they need to be rated to both the correct capacitance and voltage for the application. You may find the back EMF effect of the motor may lead to stray voltages significantly higher than the 240v input.

On another tack, I don’t think I’d replace a anything electrical with a non OEM part. If the pump later catches fire etc (unlikely I know) you’re leaving yourself wide open liability wise. A judge would have you’re pants down.
Click to expand...

OSG that's what I said! Match or exceed the existing spec. So long as you have the same or better then no one can come back at you.
 
In my world it would have to be like for like, part number for part number. May be different for you guys.

I’m not sure I’d expose myself to the extra risk. It’s not going to be much cheaper by the time you’ve got the right cap and gone back.

Chances are if the caps had it a bearing or seal won’t be far behind. You’ve then got a naffed off customer badmouthing you to all and sundry.
 
OffshoreGas said:
In my world it would have to be like for like, part number for part number. May be different for you guys.

I’m not sure I’d expose myself to the extra risk. It’s not going to be much cheaper by the time you’ve got the right cap and gone back.

Chances are if the caps had it a bearing or seal won’t be far behind. You’ve then got a naffed off customer badmouthing you to all and sundry.
Click to expand...

I have got the precise spec for the capacitor. I would never fit anything other than the same spec as original. I am also the ‘customer ‘ myself so even more reason to want it done correctly! Cheers.
 
I just coincidentally pulled a few old pumps apart and removed the capacitors.
Some of them are the Wilo as above
 
Marko! said:
Wow, that’s a coincidence and a half! How was the connection made?
Click to expand...

This is going to sound strange, but I am not sure. I was stripping the outer electrics and plastic parts of the various motors. Capacitors are off but I do remember cutting some of the cables.
Think some are soldered into a board.
Will take a look now.
 
Best said:
I have some of the black capacitors from old Wilos.
Looks like I snipped the ends of the wires. Think they were soldered into a board
Click to expand...

I think that is most likely as I can't see a way to disconnect it. I would have liked to test the old one first but didn't want to take it off without having a replacement. I've ordered a new one now, so should be able to swap it soon. I'll post the outcome afterwards. Cheers
 

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