Hello,
SYSTEM
I have a conventional worcestor boiler, a 50 gallon water tank, a hot water cylinder APX 7 years old 1100mm x 450mm apx and an expansion vessle fitted.
PROBLEM
The overflow pipe runs outside the house from the cold water tank, when the hot water hasn't been used for apx 24 hours the pipe over flows, i have checked the float valve and that is shutting off fine and it has also got an isolation valve prior to the mains entering the float valve which i have shut off and the problem still occurs. The cold water inlet to the hot water cylinder becomes hot and cools down the nearer to the cold water tank you get. I have also tested the system when the cylinder is cold by turning off the stop cock before the cold water feeds into the cylinder from the tank which then results in the vent pipe that feeds from the cylinder then drips into the cold water tank resulting in it overflowing again. I have also tried this with the boiler turned off via the programmer on both the hot water and central heating buttons and it still over flows which leads me to think that the coil is split in the hot water cylinder????
What i don't understand that if this is the case why is there still 1-1.5 bar showing on the expansion vessle dial surely if the water was leaking into the hot water supply in the cylinder than this pressure would drop esspecially with the amount of water that is overflowing (small constant trickle) and i would have noticed a discolouration from the inhibator???
Baffled Phil
[/u]
SYSTEM
I have a conventional worcestor boiler, a 50 gallon water tank, a hot water cylinder APX 7 years old 1100mm x 450mm apx and an expansion vessle fitted.
PROBLEM
The overflow pipe runs outside the house from the cold water tank, when the hot water hasn't been used for apx 24 hours the pipe over flows, i have checked the float valve and that is shutting off fine and it has also got an isolation valve prior to the mains entering the float valve which i have shut off and the problem still occurs. The cold water inlet to the hot water cylinder becomes hot and cools down the nearer to the cold water tank you get. I have also tested the system when the cylinder is cold by turning off the stop cock before the cold water feeds into the cylinder from the tank which then results in the vent pipe that feeds from the cylinder then drips into the cold water tank resulting in it overflowing again. I have also tried this with the boiler turned off via the programmer on both the hot water and central heating buttons and it still over flows which leads me to think that the coil is split in the hot water cylinder????
What i don't understand that if this is the case why is there still 1-1.5 bar showing on the expansion vessle dial surely if the water was leaking into the hot water supply in the cylinder than this pressure would drop esspecially with the amount of water that is overflowing (small constant trickle) and i would have noticed a discolouration from the inhibator???
Baffled Phil
[/u]
