F&E tank overflowing. why ? Oh why ?
- Thread starter David cooper
- Start date
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Why not look at the the pipe configuration for F&E cistern
It is not uncommon for the cylinder to be on gravity circulation, later converted to fully pumped but connections off the cylinder primaries remaining unchanged.
Here on, pump kicks in, pump over is inevitable
Seen a few weird and wonderful conversions. Last one was AAV installed upside down
It is not uncommon for the cylinder to be on gravity circulation, later converted to fully pumped but connections off the cylinder primaries remaining unchanged.
Here on, pump kicks in, pump over is inevitable
Seen a few weird and wonderful conversions. Last one was AAV installed upside down
Update. Ordered & fitted a new boilerstat on tuesday .(Using heatsink compound)
Got the phone call next day to say F&E tank still dripping when heating is running.
Went back yesterday, pump is on c/h return. Was on speed 3 & hadn't been touched before problem started, put it down to speed 2, boilerstat set to 1 but pipework still very hot. Boilerstat is cutting off though.
Phone call today, Still dripping !
When in loft yesterday noticed that when pump kicked in some water pumps from open vent into tank but then stops.
Gravity h/w.
I'm so stressed out with this job.
Got the phone call next day to say F&E tank still dripping when heating is running.
Went back yesterday, pump is on c/h return. Was on speed 3 & hadn't been touched before problem started, put it down to speed 2, boilerstat set to 1 but pipework still very hot. Boilerstat is cutting off though.
Phone call today, Still dripping !
When in loft yesterday noticed that when pump kicked in some water pumps from open vent into tank but then stops.
Gravity h/w.
I'm so stressed out with this job.
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How high is the expansion pipe over the expansion tank?
Just seen in your first post that you changed it from 1 ft to 2 ft.
Andy
Just seen in your first post that you changed it from 1 ft to 2 ft.
Andy
It doesn't pump over all the time (it was doing that before I raised the open vent)
Secondly, no other alterations have been done to the system before this problem started.
Just got home from work. Friday is always airlock city!
Some nice slew are now calming me down
Secondly, no other alterations have been done to the system before this problem started.
Just got home from work. Friday is always airlock city!
Some nice slew are now calming me down
Been many years playing with back boilers but the 28mm primaries should rise up from the boiler and connect to the cylinder...from the cylinder flow connection the vent should rise up and over the F&E cistern and the feed will drop down to the cylinder primary return connection.
The heating circuit should connect direct to the boiler...the lower connection being the combined return (cylinder primary and heating returns tee'd together) and the upper 2 connections for cylinder and heating flow.
This problem has probably started due to a partial blockage...and now the pressures around the system are such that the pump finds it easier to circulate up and round the vent.
How did you end up working on such an old system...it's rarely worth taking on jobs like these...too much chance of failure and any customer with a prehistoric system is unlikely to want to spend much.
The heating circuit should connect direct to the boiler...the lower connection being the combined return (cylinder primary and heating returns tee'd together) and the upper 2 connections for cylinder and heating flow.
This problem has probably started due to a partial blockage...and now the pressures around the system are such that the pump finds it easier to circulate up and round the vent.
How did you end up working on such an old system...it's rarely worth taking on jobs like these...too much chance of failure and any customer with a prehistoric system is unlikely to want to spend much.
Gasguru, should the pump be on the flow ? Could being on the return be a cause of the problem - which has developed over time due to sludge in the boiler/combined return. O.P -one way to verify the domestic water is not getting into the c/h and causing f+e level to rise -( I know the cyl. is new but I trust nothing nowadays.) Empty the hot water from the cylinder and observe the f+e cistern.
It needs ripping out....gravity hot water in 2019
Gravity has many advantages.... even in techno crazy 2019.
You are the plumber, I am just a happy end user.
No pressure operated safety valves required.
No pressure reducing valves, often needed to prevent water jetting in and then striaght back out of the wash basins.
Water available when the supply is cut off to refill toilet cisterns ( very infrequent benefit ).
Copious but gentle flow to fill the bath from the hot water cylinder
That said I do have a mains pressure shower with the hot supply heated by passing through a second coil in the hot water cylinder.
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