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Hi all,
I’ve had a plumber fit in a new megaflo and system boiler a few weeks ago as part of a loft conversion with the boiler now on the ground floor and the megaflo in the loft due to space issues.
I had to call him back last week as I was getting reverse circulation when HW on/CH off into the loft radiators as the return was teed off midway on the same pipe as the megaflo return - hence megaflo not being the last tee into main primary return.
This has since been corrected with the loft radiators having a separate tee into primary return and the last return tee being the megaflo. The plumber put in a NRV on the primary return between the last tee for the megaflo and rest of the returns from the CW (top pipe being the loft return). I’ve now noticed that one radiator just refuses to get hot (on the ground floor), the flow seems to be warm but the return is stone cold and the radiator gets like warm. I had the system power flushed last year so unlikely to be sludge I would think.
Is it likely that the loft radiator return is feeding into the returns for the other radiators hence this radiator struggling with circulation? All other radiators on the ground floor get hot as well as on the first floor.
Just wondering if the NRV has been incorrectly placed, or what other reason there could be for the radiator not getting hot - I’ve opened both valves and checked the pin for the TRV.
Any help is appreciated!
In the attached pic, the furtherest tee is the return from the megaflo, nearest tee is return from the loft radiators (NRV between them) the pipe from the right of the pic is the return from the rest of the radiators and then dips under the floorboards. The return water direction is directly into the wall - through the insulation.
I’ve had a plumber fit in a new megaflo and system boiler a few weeks ago as part of a loft conversion with the boiler now on the ground floor and the megaflo in the loft due to space issues.
I had to call him back last week as I was getting reverse circulation when HW on/CH off into the loft radiators as the return was teed off midway on the same pipe as the megaflo return - hence megaflo not being the last tee into main primary return.
This has since been corrected with the loft radiators having a separate tee into primary return and the last return tee being the megaflo. The plumber put in a NRV on the primary return between the last tee for the megaflo and rest of the returns from the CW (top pipe being the loft return). I’ve now noticed that one radiator just refuses to get hot (on the ground floor), the flow seems to be warm but the return is stone cold and the radiator gets like warm. I had the system power flushed last year so unlikely to be sludge I would think.
Is it likely that the loft radiator return is feeding into the returns for the other radiators hence this radiator struggling with circulation? All other radiators on the ground floor get hot as well as on the first floor.
Just wondering if the NRV has been incorrectly placed, or what other reason there could be for the radiator not getting hot - I’ve opened both valves and checked the pin for the TRV.
Any help is appreciated!
In the attached pic, the furtherest tee is the return from the megaflo, nearest tee is return from the loft radiators (NRV between them) the pipe from the right of the pic is the return from the rest of the radiators and then dips under the floorboards. The return water direction is directly into the wall - through the insulation.
