Can a CH pump wear out?

[sambotc]

I see that your cold feed connects to a tee at the return emerging from the cylinder, and the vent connects to a tee at the flow that goes into the cylinder. If the pump is before the vent then this is a significant factor in the pumping over.

Softus I think from what i can make out, the pump is on the return, so the cold feed and vent are behind the pump, just with a cylinder in between them!

Sound's like a pumped conversion from an existing solid fuel/gravity set up to me.

Does the flow into the cylinder go into the top connection, or bottom. Which pipe get's hot first?

Firstly i would put pump on setting 1 as long as it is circulating all rad's it will be fine for a short term fix. Does this fix the pumping over?

Sam

 

[JohnD]

...new water which is already orange.

 

[DIYedboy]

Old water already chucked, what about the pipework boys, do I need to chop bits out or what?

 

[Softus]

...new water which is already orange.

I see. So were you asking if the water in the F&E cistern, which was orange after the pump change, had turned black?

 

[Softus]

Old water already chucked, what about the pipework boys, do I need to chop bits out or what?

You're using words that I don't understand.

When you say "chucked", does that mean that you drained the system before changing the pump?

I have other questions:-

1. Why did your pump age 20 years within one week?
2. Where does the flow split into the flow to the radiators and the flow to the cylinder?
3. Do you have any motorised valves?
4. Do you have a room thermostat?
5. Do you have a cylinder thermostat?

 

[JohnD]

I see. So were you asking if the water in the F&E cistern, which was orange after the pump change, had turned black?

No of course I wasn't

he said it was pumping over from the vent, but not reaching the overflow.

Therefore I deduce it is coming up the vent and going down the F&E, therefore mixing with the rest of the system water.

 

[Softus]

I see. So were you asking if the water in the F&E cistern, which was orange after the pump change, had turned black?

No of course I wasn't

I see. But when I asked why it wasn't already black, you referred to a statement about the water in the F&E, which I suspect wasn't black, isn't black, and never will be black.

So if you weren't asking if the water in the F&E had turned black, then you must have been asking if the water not in the F&E had turned black. i.e. the water in the radiators etc.

So, why wasn't that water already black?

 

[DIYedboy]

Right on SambotC, pump is on return, top connection of cylinder gets hot first, lower cylinder connection is 15mm with feed also going into it. Water in system is sort of black/brown (been in there 2 days).

So it goes boiler, cylinder with expansion, cylinder return in 15mm with flow, pump, boiler. There is one zone valve on flow to rads

 

[JohnD]

I see. But when I asked why it wasn't already black, you referred to a statement about the water in the F&E, which I suspect wasn't black, isn't black, and never will be black.

So if you weren't asking if the water in the F&E had turned black, then you must have been asking if the water not in the F&E had turned black. i.e. the water in the radiators etc.

So, why wasn't that water already black?

keep up man

It has been pumping over all this time, so the water in the F&E will have been about the same as the water in the rads

He said it was orange earlier

Then he added X400 so I asked if it had gone black

 

[DIYedboy]

Softus, you are a bit of a monkey, but never mind, everyone has a 'personality' don't they?

In the past 3 weeks I must have drained the system 6 times, fitted a new pump two days ago, water then was orange. Sludge in tank today was brown, the bit of water I drained out tonight was black. This system had a new boiler 10 years ago, otherwise it aint been touched since it was fitted in 1970, (the house has been owned by my uncle since 1950)

 

[Softus]

So, why wasn't that water already black?

keep up man

I'm fully up to speed.

It has been pumping over all this time, so the water in the F&E will have been about the same as the water in the rads

That's not a fact, that's a presumption.

He said it was orange earlier

That's pretty easy to understand, and even easier to predict - if he'd emptied or drained the F&E cistern, and then added water to it, then it would look orange, unless he's replaced the cistern with a brand new one that contained no rust particles.

Then he added X400 so I asked if it had gone black

And I asked you if you were referring to the water in the F&E cistern, and you said that you weren't. As yet the only thing I fail to understand is your reluctance to give a straight answer to a straight question.

 

[ChrisR]

Suunds like it's thus. Blockages will be around the green area.

 

[Softus]

Softus, you are a bit of a monkey, but never mind, everyone has a 'personality' don't they?

If, by "bit of a monkey", you mean "someone who successfully repairs heating system", then I suppose that I am.

In the past 3 weeks I must have drained the system 6 times, fitted a new pump two days ago, water then was orange.

Which water? The stuff in the F&E, the stuff you drained out, or the stuff that appeared when venting?

Sludge in tank today was brown

Of course it was. It always is, even in a clean system.

the bit of water I drained out tonight was black.

Of course it was. It always is, in a dirty system.

I've never asked you what the colour of the water is/was. However, I've asked you a whole raft of other, far more important, questions, most of which you seem to have ignored.

This system had a new boiler 10 years ago, otherwise it aint been touched since it was fitted in 1970, (the house has been owned by my uncle since 1950)

In that case, if that boiler has a steel heat exchanger, then you should start saving for a replacement.

 

[Softus]

Blockages will be around the green area.

Quite often they will. But the OP says that this system is pumping over, and declines to reveal enough information to determine whether it's C, Y, S, or no plan whatsoever.

 

[sambotc]

Thats how i imagine it, if so i'd be inclined to try this as an easy upgrade.

Untitled

• sambotc
• 11 Dec 2008
• 1

Removes any possible blockage and put's the cf&v in a better position. Can't see there being a blockage mind if the system has been drained and refilled so many times. How quickly did it fill up each time?

Sam