Hot water on - reverse flow ? into CH

[jjpearce05]

S-Plan system.

When HW on, radiators get hot. Checked motorised valves, they appear to be OK.

BG engineer reckons the fault is with my return pipework which is not covered by their servicecare agreement.

Any ideas what needs doing/where to look to resolve it ?

Also, would it be worth changing the manual bypass to an automatic bypass ?

Untitled

• jjpearce05
• 7 Nov 2009
• 3

 

[kevplumb]

changing the bypass won't solve anything fella

you need to trace the pipework back

 

[seco services]

i would say you have probably got two returns on the radiator pipework back to the primaries causing reverse circulation.

by the looks of it they'll be under the floorboards.

 

[jjpearce05]

thanks - I was considering changing to abv to make the system more "efficient", not to solve the reverse circulation issue

 

[kevplumb]

thanks - I was considering changing to abv to make the system more "efficient", not to solve the reverse circulation issue

my mistake

carry on

 

[seco services]

sort the problem out first, then add your goodies unless you like cooking in the summer.

 

[jjpearce05]

should the bypass terminate in the return where it does, or should it terminate under the floor with the rads/hw return in a "common" return

what is the gate valve on the hw return for - its doesn't move

 

[doitall]

wheres the cold feed.

You sure that blue valve is not letting by.

Has any rads or work been done recently.

 

[jjpearce05]

cold feed - on other side of airing cupboard I believe

blue valve - yes checked it - from cold, there is no heat on other side of valve - when opened manually, pipe gets hot straight away

have only been in house for 4 months, no work done by me

 

[kevplumb]

what is the gate valve on the hw return for - its doesn't move

it does the same job as a lockshield on a rad restricts the flow

 

[jjpearce05]

so would adjusting this prevent reverse flow (without breaking anything else !!)

 

[twgas]

so would adjusting this prevent reverse flow (without breaking anything else !!)

No - unless you turn it right off, but then you'll not get hot water

 

[gas_man_gaz]

if ya can find the return pipework from the radiator circuit ya could fit a check valve which might sort it

 

[doitall]

cold feed - on other side of airing cupboard I believe

blue valve - yes checked it - from cold, there is no heat on other side of valve - when opened manually, pipe gets hot straight away

have only been in house for 4 months, no work done by me

Does it look as though a radiator has been added anywhere, maybe a newer rad.

 

[jjpearce05]

Not recently, no