Central heating pump incorrectly installed

T

TOMUL

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23 Sep 2004
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We've bought a house where the central heating pump is forcing the water the wrong way through the boiler. :(
It is a Grundfos selectric UPS15-50 Pump. Is there any way I can reverse the flow direction without completely removing the pump from the system and turning it around?
For instance can I change the motor direction and flip the impeller around?
 
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does your pump not have an isolator valve either side of it?

even if you could do as you suggested it would be quicker / better to turn the pump around
 
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Why CAN'T you just turn it round, if its been put in the wrong way??
 
If your pump really is the wrong way round, reverse it quick. My boiler was wrecked by an idiot plumber who fitted a replacement pump upside down.

Like most boilers (I imagine, not being a pro) mine had a thermostat reading the water temp at the outflow (upper port). If the flow is reversed, it's measuring the cooler return water as well as trying to defy gravity. This plays havoc with the temp settings - the boiler thinks it's never up to heat and is constantly in overdrive. That finished my old boiler off.

As Breezer says, turning it round is easy if it has isolator valves each side. Otherwise you'll have to drain the system (or plug-freeze the pipes?).
 
might be being an idiot but what problems is he pump being around the wrong way causing?
 
how can he be sure its the pump maybe the boiler pipework is crossed,just a thought :idea:
 
Tomul, you can easily check if it's the right way round. There is an arrow on the side showing the flow direction. If the pump is fitted on the "hot" side of the boiler (the pipe coming from the upper port), it should flow AWAY from the boiler. If on the return (lower port), it should flow INTO the boiler.

As Corgiman asks, it would be interesting to know what symptoms Tomul is seeing. Assuming the boiler hasn't melted already...
 
I,ve got my pump fitted wrong way round.What did you finnaly do.
 
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