Noisy Heating System

[NathanNaylor]

I have an indirect heating and hot water system - I think. There is a Grundfos Mark II Class F pump on it. It seems to be on all the time and is vibrating the pipes.

Should it be on all the time?

How do I stop the noise?

Nathan

 

[Diyisfun]

Has it always been on all the time?
If yes then thats how it was wired
If no then there is fault

 

[seco services]

you don't want it on all the time.
is it a s or y plan system ?
need more info.

 

[NathanNaylor]

Has it always been on all the time?
If yes then thats how it was wired
If no then there is fault

It's always been on, since we moved in in July. It just seems to have got louder and really vibrates the pipes. What does the pump do? Is it for the heating?

 

[NathanNaylor]

you don't want it on all the time.
is it a s or y plan system ?
need more info.

What is an S or Y plan system?

 

[D_Hailsham]

S PLan Layout

Y plan layout

The Y plan has one three-port motorized valve, the S plan has two 2-port valves.

The pump should only run when the boiler is on, though it could run on for a few minutes after the boiler has gone out.

The pump circulates the hot water from the boiler through the radiators and the coil in the hot water cylinder. then back to the boiler to be reheated.

What boiler do you have? Make and Model

 

[NathanNaylor]

S PLan Layout

Y plan layout

The Y plan has one three-port motorized valve, the S plan has two 2-port valves.

The pump should only run when the boiler is on, though it could run on for a few minutes after the boiler has gone out.

The pump circulates the hot water from the boiler through the radiators and the coil in the hot water cylinder. then back to the boiler to be reheated.

What boiler do you have? Make and Model

We have a Baxi Solo 3 40 PF.

As for the Y/S plan that may take me a little longer to work out as I know absolutly nothing about plumbing.

 

[D_Hailsham]

We have a Baxi Solo 3 40 PF.

This boiler has the pump wired directly to the boiler so it can run for a few minutes after the boiler goes out (it's called pump over-run) the purpose is to prevent the boiler overheating.

On some boiler the overrun is controlled by a thermostat in the boiler, which is easy to replace. The Solo, to be difficult, uses a timer, which is part of the Circuit Board: not a DIY job to replace.

If the pump runs continuously the timer is faulty.