Hi all.
I've got a problem with a shower that is powered by a salamander ct50 pump. A bar mixer valve that we'd used for years stopped working properly and gave one temperature regardless of where the temp was set to.
I bought a new mixer, a one with an overhead rainfall spray, I fitted it and it didn't work very well. The shower kept stopping and starting when on the ordinary showerhead but worked continuously when the rainfall thing was used. Stopping the shower and leaving it a short while resulted in it not starting again. It did occasionally start on the rainfall setting though. Putting it on full cold got it going then you could set the temp you wanted. Leaving it a long time though and it didn't work in any position unless I climbed into the loft and bled the pipes.
The pump sits on a shelf just above the hot water cylinder in a cupboard on the first floor. The outgoing pipes in 22mm go from the pump go up into the loft along the loft floor for about a metre and then reduce to 15mm to drop down into the bathroom to the shower. The short 15mm pipes in the loft have air bleeds on each one at the highest point. The cold water tank in the loft is raised up off the floor about 5inches and the cold shower supply is taken off this.
In the cupboard the hot take off from the top of the cylinder is a 22m pipe that is soldered into an immersion heater blanking plug and this pipe goes into the cylinder I think about 5 inches or so. So hot water comes out then drops down the side of the cylinder through an anti gravity loop about 10inches before going up to the pump. I'll take some picture tomorrow if they will help.
This new valve is thermostatic, I don't think the previous bar valve was but I can't be certain. The only problem I ever had with the last valve was the pump would very occasionally switch on and then off fairly rapidly.
I'm guessing air is a problem or maybe a lack of pressure when the valve is set to it's central marked temperature of 38 degrees c. That's why putting it on full cold will sometimes get it working whereas with part hot and cold there isn't enough pressure on either switch to kick it into life.
My setup is similar to the diagram apart from my pump is just above the cylinder, my hot water take off the cylinder is out of the top and I don't have the non return valve fitted.
Any suggestions most welcome, thanks.
I've got a problem with a shower that is powered by a salamander ct50 pump. A bar mixer valve that we'd used for years stopped working properly and gave one temperature regardless of where the temp was set to.
I bought a new mixer, a one with an overhead rainfall spray, I fitted it and it didn't work very well. The shower kept stopping and starting when on the ordinary showerhead but worked continuously when the rainfall thing was used. Stopping the shower and leaving it a short while resulted in it not starting again. It did occasionally start on the rainfall setting though. Putting it on full cold got it going then you could set the temp you wanted. Leaving it a long time though and it didn't work in any position unless I climbed into the loft and bled the pipes.
The pump sits on a shelf just above the hot water cylinder in a cupboard on the first floor. The outgoing pipes in 22mm go from the pump go up into the loft along the loft floor for about a metre and then reduce to 15mm to drop down into the bathroom to the shower. The short 15mm pipes in the loft have air bleeds on each one at the highest point. The cold water tank in the loft is raised up off the floor about 5inches and the cold shower supply is taken off this.
In the cupboard the hot take off from the top of the cylinder is a 22m pipe that is soldered into an immersion heater blanking plug and this pipe goes into the cylinder I think about 5 inches or so. So hot water comes out then drops down the side of the cylinder through an anti gravity loop about 10inches before going up to the pump. I'll take some picture tomorrow if they will help.
This new valve is thermostatic, I don't think the previous bar valve was but I can't be certain. The only problem I ever had with the last valve was the pump would very occasionally switch on and then off fairly rapidly.
I'm guessing air is a problem or maybe a lack of pressure when the valve is set to it's central marked temperature of 38 degrees c. That's why putting it on full cold will sometimes get it working whereas with part hot and cold there isn't enough pressure on either switch to kick it into life.
My setup is similar to the diagram apart from my pump is just above the cylinder, my hot water take off the cylinder is out of the top and I don't have the non return valve fitted.
Any suggestions most welcome, thanks.
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