Pump wrong way around

[craigtrekker]

Hi all,

Inherited this system.

When I turn the heating on, I was expecting heat to leave the boiler, through the pump and then hit the two zone valves, then go on its merry way.

Instead, it seekm the “return” pipe gets hot first and the “flow” is last to get hot.

Looking at the pump, it’s clear someone has replaced the head but left the old red body in place. Looking at the pump instructions, and pictures on Google, it seems the pump is pumping water through the filter, into the boiler and back out, so in reverse.
Do you agree with this and should I turn it around? There’s no issues with the system that I can tell having been here for 3 weeks. It all works fine.

 

[denso13]

Looks like it may be like that deliberately, the zone valves seem to be pointing towards the pump. Can you confirm which way the arrow is point on the zone valve body?

It was common to have the pump on the return on older systems.

 

[craigtrekker]

Seems you are right , very odd.

 

[ericmark]

My own the pump is on the return, so are the zone valves, that was how it was done, so the pump did not run so hot, but when TRV heads came in, the standard changed, so a by-pass valve could be included.

 

[Harry Bloomfield]

Instead, it seekm the “return” pipe gets hot first and the “flow” is last to get hot.

I would double-check, if you have not done already, with the boiler manual - which is the flow and return at the boiler, so you are certain it's working backwards...

Looking at the pump, it’s clear someone has replaced the head but left the old red body in place.

What makes you think the pump head has been replaced?

The pump body, the red painted part, sets the direction of flow - so if the head has been replaced, it was pumping the wrong way from original install, or perhaps a the boiler has been replaced, where the pipe layout was different.

Either way, get it checked/corrected.

 

[craigtrekker]

Thanks all,

I downloaded the manual.

“
9.2 The flow and return sockets are located at the rear of the

appliance, two at high level (flow) and two at low level (return).

Connection of the flow and return sockets can either be made on

diagonally opposite sockets or on the same side of the boiler.”

I followed the pipe from the pump into the boiler and it does indeed go into the return at the bottom ( it drops down behind the boiler despite looking like it goes into the top.

Seems it’s all fine.

 

[denso13]

Seems it’s all fine.

Yes, nothing to worry about.

 

[Johntheo5]

Thanks all,

I downloaded the manual.

“
9.2 The flow and return sockets are located at the rear of the

appliance, two at high level (flow) and two at low level (return).

Connection of the flow and return sockets can either be made on

diagonally opposite sockets or on the same side of the boiler.”

I followed the pipe from the pump into the boiler and it does indeed go into the return at the bottom ( it drops down behind the boiler despite looking like it goes into the top.

Seems it’s all fine.

You could also run that UPS3 on either CC1, one sold green LED at 4.2M which will be sufficient for most systems, or, certainly, CC2, one solid green followed by one solid yellow LED at 5.2M which will satisfy 99% of systems, should have no need to run at CC3, one solid green followed by two solid yellows at 6.4M, rarely if ever required, Just press the setting button briefly to change settings.