(a) I have a sealed system-under Worcester 24CDi combi boiler.
(b) Only one radiator - the one downstairs by the door - has a LRV. The kitchen rad (which is close to the boiler) has two wheelhead valves, so is the small one in the bathroom. Four (three bedrooms and reception) has a wheelhead on one side, and a Dyfoss TRV on the other. I need to remove one radiator at a time to decorate. Question:
(1) Do I have to drain the system before I remove a rad?
(2) How do I balance them without the LRV?
(3) What are the possible mishaps that I may have to face?
(b) Only one radiator - the one downstairs by the door - has a LRV. The kitchen rad (which is close to the boiler) has two wheelhead valves, so is the small one in the bathroom. Four (three bedrooms and reception) has a wheelhead on one side, and a Dyfoss TRV on the other. I need to remove one radiator at a time to decorate. Question:
(1) Do I have to drain the system before I remove a rad?
(2) How do I balance them without the LRV?
(3) What are the possible mishaps that I may have to face?