Automatic cistern syphons

[lbp plg & htg]

Fitted 2 S/S toilet urinals approx 16mths ago in a school, got a call yesterday to say one wasnt working. The set-up is a 15mm copper pipe run at high level then tees off left and right, same distance apart and height.

Got there today and looking in one the cistern was 1/3rd full but no water coming from pipe, looked in the other and 1/2 full and filling then flushing no problem. Put my thumb over the end of the filling one and the other started to fill, thumb off and it stopped?

This has baffled me so any suggestions?

Bearing in mind its 2 open ends with the water on, been working for some time with no problem and now its stopped filling one of them.

 

[Mike Jackson]

Bit of crud partially restricting the cock on the second one?

 

[lbp plg & htg]

Its an open end.

 

[aqualogic7]

spider or miner bee nest in pipe work

 

[aqualogic7]

what type of control do you have on supply pipe

 

[lbp plg & htg]

spider or miner bee nest in pipe work

Pipe run is at max 2 metres from where tee branches off so I doubt it but you never know?

 

[lbp plg & htg]

what type of control do you have on supply pipe

There is a sensored control but as it was existing Im not too sure of the name, this is situated 2 foot before the tee.

 

[aqualogic7]

the control could be letting less water pass is it a hard water area or maybe a filter on control

 

[lbp plg & htg]

Soft water area, whats getting me is it will only let water out of the left hand side unless i block it then it allows the right hand side to fill?

 

[Mike Jackson]

The control is not letting out enough water. You need to adjust it and potentially throttle down the flow to the left hand cistern with a pet cock.

 

[snowhead]

The control unit may have a (blocked) filter on the inlet.

 

[nicro3]

Fitted 2 S/S toilet urinals approx 16mths ago in a school, got a call yesterday to say one wasnt working. The set-up is a 15mm copper pipe run at high level then tees off left and right, same distance apart and height.

Read more: http://www.ukplumbersforums.co.uk/plumbing-forum/40687-automatic-cistern-syphons.html#ixzz290wCWgGc Hi if I I am reading this right you have two urinals fed from a single cistern. The down pipe should be 22mm from auto valve and tee 15mm to each spreader to work correctly. Hope this makes sense.
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[lbp plg & htg]

Fitted 2 S/S toilet urinals approx 16mths ago in a school, got a call yesterday to say one wasnt working. The set-up is a 15mm copper pipe run at high level then tees off left and right, same distance apart and height.

Read more: http://www.ukplumbersforums.co.uk/plumbing-forum/40687-automatic-cistern-syphons.html#ixzz290wCWgGc Hi if I I am reading this right you have two urinals fed from a single cistern. The down pipe should be 22mm from auto valve and tee 15mm to each spreader to work correctly. Hope this makes sense.
​

Hi there and thanks to those who tried to help - upshot was that it was what I can only assume as airlocked? Managed to unclip pipe from wall and pull away enough to suck it and hey presto both now working again!

Also it was 2 urinals with 2 cisterns each having an automatic syphon installed.