Good morning guys, I have problem with cold radiators downstairs and very hot water in cylinder.
I just fitted new pump ( Grundfos UPS 2 15-60 6m Head).
If I set pump to I. speed, Radiators (R3, R4, R5) on first floor get hot but not enough. Downstairs radiators (R1, R2) are cold. If I close vents on radiators upstairs, downstairs radiators get warm but just 25°C - 30°C in one hour of time. Gravity return (GR) pipe from hot water cylinder is nearly same hot as gravity flow (GF) pipe when I touch it close to back boiler (point D)
If I set pump to II. speed and open radiators upstairs, downstairs radiators still cold and water will start drops from pipe out of house (point C).
If I set pump to III. speed both pipes to expansion tank (green pipes) get hot and water is leaking from pipe out of house.
Please have a look on this scheme of my heating :
I thing problem is pump fitted on pumped return (PR) pipe instead of Pumped flow (PF) pipe. So pump is pumping water in to boiler (Baxi Bermuda 552) and increase pressure inside boiler to pumped flow pipe but also in to gravity flow (GF) pipe. For water is easier way to flow to cylinder and back to boiler (22mm pipes) than to radiators (15mm pipes starts on firs floor)
I cant fit pump to PF pipe, there is no space for pump.
I want to ask you guys if is it good idea to fit single check valve on to gravity return pipe (point D) to stop water go this way in to cylinder and to fit gate valve on to gravity flow pipe (point E) to decrease flow in to cylinder.
Thank you very much for any help.
I just fitted new pump ( Grundfos UPS 2 15-60 6m Head).
If I set pump to I. speed, Radiators (R3, R4, R5) on first floor get hot but not enough. Downstairs radiators (R1, R2) are cold. If I close vents on radiators upstairs, downstairs radiators get warm but just 25°C - 30°C in one hour of time. Gravity return (GR) pipe from hot water cylinder is nearly same hot as gravity flow (GF) pipe when I touch it close to back boiler (point D)
If I set pump to II. speed and open radiators upstairs, downstairs radiators still cold and water will start drops from pipe out of house (point C).
If I set pump to III. speed both pipes to expansion tank (green pipes) get hot and water is leaking from pipe out of house.
Please have a look on this scheme of my heating :
I thing problem is pump fitted on pumped return (PR) pipe instead of Pumped flow (PF) pipe. So pump is pumping water in to boiler (Baxi Bermuda 552) and increase pressure inside boiler to pumped flow pipe but also in to gravity flow (GF) pipe. For water is easier way to flow to cylinder and back to boiler (22mm pipes) than to radiators (15mm pipes starts on firs floor)
I cant fit pump to PF pipe, there is no space for pump.
I want to ask you guys if is it good idea to fit single check valve on to gravity return pipe (point D) to stop water go this way in to cylinder and to fit gate valve on to gravity flow pipe (point E) to decrease flow in to cylinder.
Thank you very much for any help.