Range with back boiler all rads cold !

Thelostcountry

HI guys.


So as stated above , I have no heat in any of my radiators , bleed them all, circulation pump was replaced , boiler had too be removed (there was a leaking joint? Hot water in the tank in the attic , water in rads stone cold , boiler on back of range is hopping hot! Have hot water at taps . Am I missing something obvious here? The cylinder did had too be drained completely (in order too be able too lift it out). Thanks.

_Brian

Sounds like there is a valve turned off stopping the water circulating to the rads.
Possibly near the cylinder, it could be a manual valve or an automatic thermostat valve.

bessboroughboy

Thelostcountry wrote: »

HI guys.


So as stated above , I have no heat in any of my radiators , bleed them all, circulation pump was replaced , boiler had too be removed (there was a leaking joint? Hot water in the tank in the attic , water in rads stone cold , boiler on back of range is hopping hot! Have hot water at taps . Am I missing something obvious here? The cylinder did had too be drained completely (in order too be able too lift it out). Thanks.

Is there a thermal switch attached to the output from the range which activates the circulation pump to the rads depending on the temp. it's set to switch on at?

Are valves at both sides of circulation pump in the open position?

Is there a non-return valve in the system that the pump may not be powerful enough to open?

Airlock in circulating pump?

Is the pipe, as far as the pump, getting hot?

Has any plumbing work been done since the system last worked?

Thelostcountry

Thanks guys.

The line where pump is connected is hot hot really hot , but when the pump runs the line goes cold!

Leak was fixed and new emersion fitted .

Only has a blow off valve fitted on back boiler line (manual) that was fitted new too

Faulty pump May be ?

Thelostcountry

I beld the pump rads a few time. Pump fitted the right way round.

John.G

Thelostcountry wrote: »

I beld the pump rads a few time. Pump fitted the right way round.

A few items there, you say that you have hot water at the taps...does this mean that the range is heating the hot water cylinder? (no immersion on) and is the cylinder coil gravity fed from one side of the range or is all the circulating water (cylinder coil and rad circuits) taken from one side of the range?.
You also say that the tank in the attic is hot?, is there any water coming out of the vent pipe over this tank (feed&expansion)
How old is the circ pump?. Is it the high (A rated) efficiency type?.

monseiur

How is the circulating pump controlled ? I assume it's by a pipe stat. Seeing that you fitted a new pump, removed cylinder etc. you should double check that pipe stat & pump are correctly wired up and operating correctly. If stat is OK your pump may be faulty, both items should be easy enough to check as a process of elimination then move on to motorised valves, air locks etc.

M.

bessboroughboy

Thelostcountry wrote: »

Thanks guys.

The line where pump is connected is hot hot really hot , but when the pump runs the line goes cold!

Any chance pump is going in wrong direction?

Think there may be an arrow on the casing

John.G

Thelostcountry wrote: »

I beld the pump rads a few time. Pump fitted the right way round.

Just re read your posts and saw that it is a new pump.... these pumps can be operated in a number of different modes including constant head and variable head, as your old pump was more than likely a fixed speed pump then it might be advisable to operate the new pump in constant head mode as well at say 3M or 4M and see how you get on. Ideally, if you know/knew the old pump settings then the new pump could be set up likewise and rule this out as a problem?. You might like to post the make/model of this new pump.

jimf

does your cylinder have a balancing valve fitted

whats your hot water supply like

John.G

jimf wrote: »

does your cylinder have a balancing valve fitted

whats your hot water supply like

To recap the OP says:

"circulation pump was replaced
Have hot water at taps
Have hot water in the tank in the attic
The line where pump is connected is hot hot really hot , but when the pump runs the line goes cold!
I bled the pump rads a few time. Pump fitted the right way round."

jimf

John.G wrote: »

To recap the OP says:

"circulation pump was replaced
Have hot water at taps
Have hot water in the tank in the attic
The line where pump is connected is hot hot really hot , but when the pump runs the line goes cold!
I bled the pump rads a few time. Pump fitted the right way round."

thanks for that

note to self read threads fully in future before commenting

agusta

jimf wrote: »

thanks for that

note to self read threads fully in future before commenting

:cool:

jimf

agusta wrote: »

:cool:

John.G

jimf wrote: »

thanks for that

note to self read threads fully in future before commenting

No offence intended..I really only posted that to remind myself of the pertinent
facts.
Its interesting in that the line from the pump gets cold very fast and the tank in the attic gets hot, I wonder if the pump is pulling in cold water from the cold feed and sending it up to the F&E tank if that,s whats meant by the tank in the attic, but one would think that this tank would then get very hot accompanied by pitching. That,s why I inquired about the new pump settings.

jimf

John.G wrote: »

No offence intended..I really only posted that to remind myself of the pertinent
facts.
Its interesting in that the line from the pump gets cold very fast and the tank in the attic gets hot, I wonder if the pump is pulling in cold water from the cold feed and sending it up to the F&E tank if that,s whats meant by the tank in the attic, but one would think that this tank would then get very hot accompanied by pitching. That,s why I inquired about the new pump settings.

no problem john no offence taken

me just being me have a bad habit of not reading posts fully


no toys thrown from pram at this moment :D

jimf

my thinking was if the tank has a balancing valve would the cyl be robbing all the hot water if valve is fully open

John.G

jimf wrote: »

my thinking was if the tank has a balancing valve would the cyl be robbing all the hot water if valve is fully open

It could of course but the cylinder can only absorb so much energy and with the range output well beyond this then the heat has to go somewhere.

Thelostcountry

Thanks everyone. Now apparently the circulator pump is "NEW TOO THIS HOUSE" not brand new!! Going too buy a new one......

It's fecking cold this morning

jimf

John.G wrote: »

It could of course but the cylinder can only absorb so much energy and with the range output well beyond this then the heat has to go somewhere.

namely the f&e tank in attic

John.G

jimf wrote: »

namely the f&e tank in attic

I don't think Attic Sauna's are legal!.

John.G

Thelostcountry wrote: »

Thanks everyone. Now apparently the circulator pump is "NEW TOO THIS HOUSE" not brand new!! Going too buy a new one......

It's fecking cold this morning

You said that the pipe goes cold when the pump starts, you can check easily enough if the pump shaft is actually rotating by removing the brass screw/plug at the end of the pump, just put a towel under it as you will get a little water coming out.

demanufactured

Is the pump on the feed or return pipe to the range?
There has to be a valve or some restriction.