potterton sumprima 30 - 80

[desrob]

went to this today because it is over heating and pumping over badly,indirect cylinder,3 port,cold water tank with vent pumping over from hot water vent,not a sealed system no expansion vessel gauge etc but no vent from heating side am i missing some thing

 

[glenno1]

Have you checked cylinder stat

 

[desrob]

Have you checked cylinder stat

sound mate, it's more the piping arrangement,ther's an f and e with no vent

 

[desrob]

sound mate, it's more the piping arrangement,ther's an f and e with no vent

when i say f and e ,i mean a vessel for topping up the central heating side, feed ,not expansion.u get me.

 

[diamondgas]

when i say f and e ,i mean a vessel for topping up the central heating side, feed ,not expansion.u get me.

the vessel has a feed and a vent yeh, vent off the hot water flow pipe yeh? If that's so then the pipework configuration is wrong!

 

[desrob]

the vessel has a feed and a vent yeh, vent off the hot water flow pipe yeh? If that's so then the pipework configuration is wrong!

yeah mate a vent of hot water,seperate tank (f&e)cold feed to heating side no vent

 

[desrob]

combined feed and vent...

 

[Kev the gas]

Sounds like a single cold feed pipe from the expansion tank.

Providing the boiler has an over heat thermostat this was and is acceptable, as long as the pipe is in 22mm.

Still trying to deciphre the problem you have though, if you are saying the hot water tank open vent pipe is pumping out water when the boiler is on, I would guess the coil in the cylinder is split.

 

[diamondgas]

combined feed and vent...

Combined f&v's can't "pump over" desrob. However it should be teed in to the flow before the pump. If it's coming off the hot water flow then it puts the f&e under positive pressure and a lot of the system under the negative effect of the pump!

 

[glenno1]

Is hot water discoloured

 

[desrob]

Combined f&v's can't "pump over" desrob. However it should be teed in to the flow before the pump. If it's coming off the hot water flow then it puts the f&e under positive pressure and a lot of the system under the negative effect of the pump!

yes your correct,but it's the hot water vent from cylinder thats pumping over,not the heating side because i you rightly said ,it can't as it's combined into f&e.and in answer to the coil being split water is not discoloured

 

[diamondgas]

yes your correct,but it's the hot water vent from cylinder thats pumping over,not the heating side because i you rightly said ,it can't as it's combined into f&e.and in answer to the coil being split water is not discoloured

The domestic hot water open vent is pumping out water? Is the immersion knackered? Bog standard 'y'plan and indirect cylinder desrob?

 

[dave1]

Check all mixer taps and valves, make sure your not getting mains water pushing back up the hot.
I've even found this before where the washing machine was connected incorrectly causing this.

 

[diamondgas]

I'd also wonder if some plonker has put a heating open vent into the domestic tank

 

[desrob]

I'd also wonder if some plonker has put a heating open vent into the domestic tank

plonker.... you maybe right, i went to the upstairs toilet and the water,when i flush it was hot,,,,they had a new cylinder put in not long a go,, so the it could be wrong

 

[diamondgas]

plonker.... you maybe right, i went to the upstairs toilet and the water,when i flush it was hot,,,,they had a new cylinder put in not long a go,, so the it could be wrong

Toilet cistern could be tank fed from the same one that has theplonker vent pumping over desrob?

 

[DirksPlumbing]

I think it is about high time to shut the boiler/immerser off. If the tank is heated up. They are build to withstand high temperatures for a certain period of time. After that its luck. Don't get me wrong it usually works fine but in the occasional case you may not have a properly supporting base or other problems that can cause an accident.
You led most wrong by using the phrase "over pumping". That is a CH problem.
Is the water coming out at a steady rate or in bursts?
The latter points to the immerser. First one points to cross flow in a mixer tap or bath mixer for example. Does the hot outlet get coldish?
The question after the discolored water tries to point you to the possibility of a damaged coil. But you stated that the cylinder is fairly new?