N
Nobbyone
Hi,
I seem to be getting a lot of air in the system if I take the pump off its bare minimum setting, just left of the venting setting.
I have a open vented S-plan, originally a british gas installation, fitted to a bungalow.
The pump and valves are in the airing cupboard together with the hot water storage tank. By-pass radiator in the hall 4m away from room thermostat. All other radiators have 2-way TRVs fitted, some on the flow and some on the return.
The boiler, a mynute VHE, is on the kitchen wall around 7m away from the pump.
There is one manual air vent between the boiler and the air separator along return to the boiler, located in the loft and at the top of vertical pipework (hell of a job to get to)
An air separator (with a separate cold feed inlet port) lies in the loft between the boiler and the pump on the flow. This air separator has been fitted standing up rather and length wise. All of its connections to the ports are correct: to pump, from boiler, to vent, from tank.
The air separator is attached to the expansion tank using 22mm copper and at the air separator 15mm, somewhere it changes width. The separate vent pipe is also 22mm copper and its bend is more than 50cm above the expansion tank.
The bottom of the expansion tank is 1.3m above the pump. The pump is 80 cm below the level of the air separator.
There is 60cm in height between the air separator and the bottom of the expansion tank (tower separator diagram gives 1m as a minimum).
The pump (wilo variable type Yonos PICO) is pumping down to the valves. I realise that pumping down should be avoided to reduce the chance of air getting trapped in the pump, which in my case is very often, but I can see why the installer has done it for convenience. As it is pumping down I would think that is the reason why the air separator has been installed.
The air has been sucked in for the last 7 years before I changed the old pump british gas pump. I thought that as I had to changed the pump it would also remove the air problem, but it has only lessened it, it not removed it completely. When I put the pump on full speed I can hear a large amount of air being pushed around. I then have to tackle the remote manual air vent in the loft to try to remove it.
My question: Will the air separator, as it is installed on its end with the vent port at the top, together with the lack of the minimum 1m head between the bottom of the expansion tank air separator cause air to be sucked in regardless of what the pump speed setting is?
I just want to know if I should give up trying to fix the air problem. Any glimmer of a possible fix to my problem would be nice. I can live with the low pump speed now but not sure if I could in the cold long winter that we are due this year.
Sorry for writing so much, more info is better than less?
I seem to be getting a lot of air in the system if I take the pump off its bare minimum setting, just left of the venting setting.
I have a open vented S-plan, originally a british gas installation, fitted to a bungalow.
The pump and valves are in the airing cupboard together with the hot water storage tank. By-pass radiator in the hall 4m away from room thermostat. All other radiators have 2-way TRVs fitted, some on the flow and some on the return.
The boiler, a mynute VHE, is on the kitchen wall around 7m away from the pump.
There is one manual air vent between the boiler and the air separator along return to the boiler, located in the loft and at the top of vertical pipework (hell of a job to get to)
An air separator (with a separate cold feed inlet port) lies in the loft between the boiler and the pump on the flow. This air separator has been fitted standing up rather and length wise. All of its connections to the ports are correct: to pump, from boiler, to vent, from tank.
The air separator is attached to the expansion tank using 22mm copper and at the air separator 15mm, somewhere it changes width. The separate vent pipe is also 22mm copper and its bend is more than 50cm above the expansion tank.
The bottom of the expansion tank is 1.3m above the pump. The pump is 80 cm below the level of the air separator.
There is 60cm in height between the air separator and the bottom of the expansion tank (tower separator diagram gives 1m as a minimum).
The pump (wilo variable type Yonos PICO) is pumping down to the valves. I realise that pumping down should be avoided to reduce the chance of air getting trapped in the pump, which in my case is very often, but I can see why the installer has done it for convenience. As it is pumping down I would think that is the reason why the air separator has been installed.
The air has been sucked in for the last 7 years before I changed the old pump british gas pump. I thought that as I had to changed the pump it would also remove the air problem, but it has only lessened it, it not removed it completely. When I put the pump on full speed I can hear a large amount of air being pushed around. I then have to tackle the remote manual air vent in the loft to try to remove it.
My question: Will the air separator, as it is installed on its end with the vent port at the top, together with the lack of the minimum 1m head between the bottom of the expansion tank air separator cause air to be sucked in regardless of what the pump speed setting is?
I just want to know if I should give up trying to fix the air problem. Any glimmer of a possible fix to my problem would be nice. I can live with the low pump speed now but not sure if I could in the cold long winter that we are due this year.
Sorry for writing so much, more info is better than less?