Hi
I installed the Evo home, 12 zones used on about 17 rads for a 4 bed house.
I have a glow worm British Gas 330 condensing boiler with a Honeywell Bypass valve, within a few meters of the boiler.
The boiler i have has it and it is 30 degrees, so if the boiler sees a difference between Flow and return of 30deg or more the boiler stops firing and the pump will just run.
This is an issue for my house when i have rooms that are not used, set to 15degrees. With the recent cold snap we have had, this means that the boiler fires (to add a little heat in these room, or may have been firing for a higher temp room) and then not long after may pull through much cooler water form the radiators in the rooms that are not used. This then trips the boiler as a Delta T fault.
I have a bypass, the bypass does trickle a flow of recirculated water to mix in with the cold and negate this issue. This does mean though that my system is less efficient at transferring hot water around the rest of the system.
If I power down the boiler and then back up the fault is cleared and the boiler resumes.
What practical uses does this feature have for the boiler?
Why do some boilers have a Data T feature and some not?
Can this temperature be adjusted?
If i was to put an programmable open collector relay in series with the red light indicator, so that when the red light came on the relay would drop the feed to the boiler, then re-establish power this would reset the fault. Possible many other less desirable faults though.
Any ideas?
Thanks
John
PS Evo is a great system, i have many other questions that i will post concerning efficacy and boiler modulation later
I installed the Evo home, 12 zones used on about 17 rads for a 4 bed house.
I have a glow worm British Gas 330 condensing boiler with a Honeywell Bypass valve, within a few meters of the boiler.
The boiler i have has it and it is 30 degrees, so if the boiler sees a difference between Flow and return of 30deg or more the boiler stops firing and the pump will just run.
This is an issue for my house when i have rooms that are not used, set to 15degrees. With the recent cold snap we have had, this means that the boiler fires (to add a little heat in these room, or may have been firing for a higher temp room) and then not long after may pull through much cooler water form the radiators in the rooms that are not used. This then trips the boiler as a Delta T fault.
I have a bypass, the bypass does trickle a flow of recirculated water to mix in with the cold and negate this issue. This does mean though that my system is less efficient at transferring hot water around the rest of the system.
If I power down the boiler and then back up the fault is cleared and the boiler resumes.
What practical uses does this feature have for the boiler?
Why do some boilers have a Data T feature and some not?
Can this temperature be adjusted?
If i was to put an programmable open collector relay in series with the red light indicator, so that when the red light came on the relay would drop the feed to the boiler, then re-establish power this would reset the fault. Possible many other less desirable faults though.
Any ideas?
Thanks
John
PS Evo is a great system, i have many other questions that i will post concerning efficacy and boiler modulation later
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