Have had Worcester engineer out today who replaced various parts, so now boiler (Worcester 24i with 13 radiators, all 8years old ) is working fine. He recommended a power flush as he could see sludge on the PRV that he replaced or at least some chemical flush being added.
So after reading previous threads I think I should try a mains water flush myself.
After reading the thread //www.diynot.com/forums/viewtopic.php?t=38902&start=0&postdays=0&postorder=asc&highlight= I`m a bit confused.
My boiler has the following connections labelled;
Safety Discharge : CH Flow : Domestic Outlet : Gas Inlet : Domestic Inlet : CH Return
Theres a filling loop from the domestic inlet to the CH flow
After reading the flushing post I assume I use the filling loop to force water into the CH flow.
This water will then be pushed around the system.
I exit this flow where? I don`t have a drain port. Can I undo the CH return and use this as the poit where I drain? (Question 1)
Closing the boiler circuit
Here I must stop the water from going through the boiler. I do this with the valve that is just after the CH flow pipe? (Question 2)
Drain down Rads
I don`t know how to do this. How do I drain the radiators?(Question 3)
Flushing Procedure
What are the discharge valve and the filling valve? (Question 4)
How do I reverse these connections? (Question 5)
How do I flush through the boiler itself? (Question 6)
How do I vent the system? Can I vent the system when its a combi boiler (I assume its a sealed system)? (Question 7)
I look forward to your replies.
Thanks
Vertical
So after reading previous threads I think I should try a mains water flush myself.
After reading the thread //www.diynot.com/forums/viewtopic.php?t=38902&start=0&postdays=0&postorder=asc&highlight= I`m a bit confused.
My boiler has the following connections labelled;
Safety Discharge : CH Flow : Domestic Outlet : Gas Inlet : Domestic Inlet : CH Return
Theres a filling loop from the domestic inlet to the CH flow
After reading the flushing post I assume I use the filling loop to force water into the CH flow.
This water will then be pushed around the system.
I exit this flow where? I don`t have a drain port. Can I undo the CH return and use this as the poit where I drain? (Question 1)
Closing the boiler circuit
Here I must stop the water from going through the boiler. I do this with the valve that is just after the CH flow pipe? (Question 2)
Drain down Rads
I don`t know how to do this. How do I drain the radiators?(Question 3)
Flushing Procedure
We are now ready to flush. First the discharge valve is opened followed by the filling valve. If the filling connection is to the return pipe, the boiler pressure gauge can be observed and the pressure limited to say 1 Bar to start with and then 2 Bar when you have more experience with the process. Initially the water will flow through all the radiators (subject to rad valve settings).
What are the discharge valve and the filling valve? (Question 4)
At the end of the process, you can reverse the fill and discharge connections and repeat the whole process in reverse. This will dislodge even more sludge.
How do I reverse these connections? (Question 5)
Finally, when the process is complete, you should briefly flush through the boiler itself (return to flow direction) and then refill the system.
How do I flush through the boiler itself? (Question 6)
The system can be vented and run as normal for a week or whatever period is recommended by the chemical cleaner manufacturer.
How do I vent the system? Can I vent the system when its a combi boiler (I assume its a sealed system)? (Question 7)
I look forward to your replies.
Thanks
Vertical