My central heating pump has been rattly for a long time now but this morning it gave out a death rattle and died. It is also red hot. It is a grundfos 15-50. I am going to replace it with a wilo yonos as our local screwfix has one in stock. My question is my grundfos has been fitted upside down, presumably so the electric connectors were easier to get at when it was installed. It has been working like this for the last 20 plus years but I need to know should I put the new one in upside down as well? Is my electric connector theory sound or will it have been put in upside down for a reason? The water pipe connections are still vertical so surely the pump will still be spinning the same way whichever way the pump is installed. Your thoughts will be much appreciated
Central heating pump
- Thread starter abssm
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Thank you. So that is why the old grundfos was put on upside down then as the body and pump house couldn't be rotated?
The motor and rotor in the pump will rotate the same way.
The pump will suck water into one of it's port and push it out from the other port. the direction the water flow through the boiler will depend od which way the ports are connecte to the pipe work.
The pump will suck water into one of it's port and push it out from the other port. the direction the water flow through the boiler will depend od which way the ports are connecte to the pipe work.
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Will there be an arrow or some other mark showing the direction? On the old one and the new one? Sorry if I'm being a bit thick
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Stamped onto the casting is a directional arrow. Whatever pump you buy, fit the pump with the arrow going in the same direction. If for whatever reason you need to rotate the motor section, then you can undo the allen bolts to remove the motor from the cast body and rotate to the desired position.
Be careful to do this with the pump dry, do not 'lever' the motor from the casting (you risk snapping the impeller) And tighten up the allen bolts evenly and squarely.
Mick
Be careful to do this with the pump dry, do not 'lever' the motor from the casting (you risk snapping the impeller) And tighten up the allen bolts evenly and squarely.
Mick
Many thanks for all your replies.
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If you are diy'ing you may find it easier to drain the system to the required level (lower than the pump), then buy a Grundfoss 15-50/60 pump. The castings should be the same, which means you can transfer the motor from the new pump over to the old body just by using the allen bolts. This can be a lot easier than trying to remove the pump valve nuts, which sometimes can involve hammer and small cold chisel, to get them undone. Again if you do this, make sure the old body is clean and DRY before transferring the motor.
and dont fit a Wilo pump get another grundfoss
I still fit the standard efficiency ones Dan, does that make me a parts changer ?
Are the old Wilo pumps no good ? The bloke that changed my Grundfos for a Wilo said that a Wilo was better as it was a "tight" (?) pump. Was he talking out of his derriere? Hope someone replies before a mod blocks me as a lot of posts I've contributed to are vanishing.... I'm going to check out the Screwfix site.
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