can you see what wrong with this system? (boiler)

[stardanny]

Went to a 3 beds house to do a refill and test. House been empty for 3 months. Heating will not work correctly. Boiler fire for 5 seconds then cut out then fire again for 5 seconds without tripping overheat.

Can you see what wrong with this system?

Untitled

• stardanny
• 23 Feb 2012
• 1

 

[Agile]

Which direction is the pump making the flow?

 

[stardanny]

Which direction is the pump making the flow?

downflow.

zone valve bottom is for cylinder, zone valve for 10 rads, 2 of them very large.

 

[Gasop]

Bottom zone valve on backwards.

 

[Dan Robinson]

No it isn't.

 

[Agile]

Does the return reduce to 15 mm?

 

[stardanny]

Bottom zone valve on backwards.

nope.

 

[willsgas]

Air lock on return pipe?

 

[matt1e]

The flowrate through the boiler is hopeless due to the 15mm return
Same as whats wrong with This one

 

[ALEC1]

the 15mm return, and the pumping down on an ov system, are two things that aer wrong for me...

 

[Dan Robinson]

Not exactly the best timer for an S-Plan though.

 

[picasso]

Could do with a bypass but what is the flow connected to on top of the boiler ?

 

[stardanny]

Does the return reduce to 15 mm?

bingo!

pump speed is at max, but couldn't take heat away from boiler quick enough. return pipe from upstair radiators ( 5 ) in 15mm toward to below where it join downstair radiators ( 5 ) in 15mm before tee off to cylinder return to boiler.

also, there is 3 faults. 1. pump is not connected to boiler overrun. 2 con pump run all the time even it is empty 3. no bypass.

 

[matt1e]

Does the return reduce to 15 mm?

bingo!

can I have 2nd prize cos my post took longer to write than Agiles
I thought of it first..... honest guv

 

[Agile]

I am glad that I saw it first but to be fair the picture is far from clear.

More concerning is that there is no gas supply pipe visible but he did say that it would fire up!