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Air lock ?
After several months away I find that there is no cold water in my shower.
The hot water is fine. The shower has a thermostatic mixer. When I open the water, only hot water comes out. The shower is fed with a Stuart Turner Monsoon pump. Which, in turn, is fed via 22 mm copper pipes from the tanks in the loft. The pump works fine with the hot water. With the cold water, since there is none, it does not pump any. I seems like an air lock. Thus, I have removed the mixer and fed the cold water pipe on the wall with water with mains pressure (about 2.5 bar) via a garden hose connected to a tap nearby. After several minutes, there is still no cold water flowing. All the valves of the cold water pipes are open (as they were before). Is there a non-return valve in the pump? What else can I do to fix this? Thanks, Antonio |
Air lock ?
On 2019-01-14 3:30 p.m., asalcedo wrote:
After several months away I find that there is no cold water in my shower. The hot water is fine. The shower has a thermostatic mixer. When I open the water, only hot water comes out. The shower is fed with a Stuart Turner Monsoon pump. Which, in turn, is fed via 22 mm copper pipes from the tanks in the loft. The pump works fine with the hot water. With the cold water, since there is none, it does not pump any. I seems like an air lock. Thus, I have removed the mixer and fed the cold water pipe on the wall with water with mains pressure (about 2.5 bar) via a garden hose connected to a tap nearby. After several minutes, there is still no cold water flowing. All the valves of the cold water pipes are open (as they were before). Is there a non-return valve in the pump? What else can I do to fix this? Thanks, Antonio did you run the hot water long enough to empty the hot water tank , you might not be getting any water at all except what's stored in the hot water tank |
I did not run the hot water for very long. Plus it still keeps flowing well and hot from the hot shower pipe and from all the other hot water taps in the house. Plus the hot water tank is fed with mains water via the tank in the loft and the mains supply is fine and there is cold water in all other cold water taps in the house
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Air lock ?
On 14/01/2019 22:30, asalcedo wrote:
After several months away I find that there is no cold water in my shower. The hot water is fine. The shower has a thermostatic mixer. When I open the water, only hot water comes out. The shower is fed with a Stuart Turner Monsoon pump. Which, in turn, is fed via 22 mm copper pipes from the tanks in the loft. The pump works fine with the hot water. With the cold water, since there is none, it does not pump any. I seems like an air lock. Thus, I have removed the mixer and fed the cold water pipe on the wall with water with mains pressure (about 2.5 bar) via a garden hose connected to a tap nearby. After several minutes, there is still no cold water flowing. All the valves of the cold water pipes are open (as they were before). Is there a non-return valve in the pump? What else can I do to fix this? Where does the cold feed come from? Does it come from a tank, and is it pumped like the hot? |
Air lock ?
"asalcedo" wrote in message ... After several months away I find that there is no cold water in my shower. The hot water is fine. The shower has a thermostatic mixer. When I open the water, only hot water comes out. The shower is fed with a Stuart Turner Monsoon pump. Which, in turn, is fed via 22 mm copper pipes from the tanks in the loft. The pump works fine with the hot water. With the cold water, since there is none, it does not pump any. I seems like an air lock. Thus, I have removed the mixer and fed the cold water pipe on the wall with water with mains pressure (about 2.5 bar) via a garden hose connected to a tap nearby. After several minutes, there is still no cold water flowing. All the valves of the cold water pipes are open (as they were before). Is there a non-return valve in the pump? What else can I do to fix this? I found at the static caraven that the hot and cold feeds to the thermostatic mixer were around the wrong way and I only got hot ...... |
Where does the cold feed come from? Does it come from a tank, and is it
pumped like the hot?[/quote] The cold feed comes from a tank in the loft, about three meters higher. The cold water is pumped with the same pump as the hot |
Air lock ?
On Monday, 14 January 2019 22:39:22 UTC, asalcedo wrote:
After several months away I find that there is no cold water in my shower. The hot water is fine. The shower has a thermostatic mixer. When I open the water, only hot water comes out. The shower is fed with a Stuart Turner Monsoon pump. Which, in turn, is fed via 22 mm copper pipes from the tanks in the loft. The pump works fine with the hot water. With the cold water, since there is none, it does not pump any. I seems like an air lock. Thus, I have removed the mixer and fed the cold water pipe on the wall with water with mains pressure (about 2.5 bar) via a garden hose connected to a tap nearby. After several minutes, there is still no cold water flowing. All the valves of the cold water pipes are open (as they were before). Is there a non-return valve in the pump? What else can I do to fix this? Thanks, Antonio There may well be none return valves in both hot and cold water pipes, usually in the mixing valve body. Try slackening off the connection to your pump and see if water is getting that far. Also check that the pipe outlets from the cold water tank in the loft are not blocked with debris or dead bird/rodent. (Is the tank covered)? |
Quote:
There are two non-return valves in the shower mixer, but the mixer is removed, so it does not affect. Stuart Turner tech support says that this pump does not have any non-return valve. So, they say there must be a blockage somewhere else. I have tried slackening off a bit the connection to the pump, and there is water in both the in and the out pipes. I cannot open it more because it would flood a delicate area. So I cannot tell if there is pressure there. I have checked the tanks in the loft with a USB camera. I have confirmed that the entrances to the pipes coming out of the tanks are clean and clear of any obstruction. The tank is covered and there is no indication of debris or vermin. I have tried again mains pressure at the end of the pipe in the shower. For about 5 minutes, then 5 minutes without pressure and then another few minutes under pressure. No difference. The connection to the shower pipe fitting is not perfect, there is some water spilling out, but still plenty of pressure is applied. |
Air lock ?
On Tuesday, 15 January 2019 13:19:15 UTC, asalcedo wrote:
harry;4228587 Wrote: Antonio There may well be none return valves in both hot and cold water pipes, usually in the mixing valve body. Try slackening off the connection to your pump and see if water is getting that far. Also check that the pipe outlets from the cold water tank in the loft are not blocked with debris or dead bird/rodent. (Is the tank covered)? This is becoming a tough one. There are two non-return valves in the shower mixer, but the mixer is removed, so it does not affect. Stuart Turner tech support says that this pump does not have any non-return valve. So, they say there must be a blockage somewhere else. I have tried slackening off a bit the connection to the pump, and there is water in both the in and the out pipes. I cannot open it more because it would flood a delicate area. So I cannot tell if there is pressure there. I have checked the tanks in the loft with a USB camera. I have confirmed that the entrances to the pipes coming out of the tanks are clean and clear of any obstruction. The tank is covered and there is no indication of debris or vermin. I have tried again mains pressure at the end of the pipe in the shower. For about 5 minutes, then 5 minutes without pressure and then another few minutes under pressure. No difference. The connection to the shower pipe fitting is not perfect, there is some water spilling out, but still plenty of pressure is applied. -- asalcedo[/i][/color] Well your mains pressure flush should clear it. You need to be sure the mains water is actually getting through. While the mains water is connected to to your cold water pipe, observe the water level in the roof tank & make sure it's rising so you are sure it's getting through. |
Problem solved.
A semi-stuck gate valve that a guest had closed... Morale of the story, never assume anything, and gate valves can be difficult to read. |
Air lock ?
On Tuesday, 15 January 2019 20:19:15 UTC, asalcedo wrote:
Problem solved. A semi-stuck gate valve that a guest had closed... Morale of the story, never assume anything, and gate valves can be difficult to read. Morale, always look for the simple things first! |
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