Had new boiler(normal) fitted 2 years ago system changed from gravity fed to unvented, pressurised via cold water mains. I need to change some rads as follows.
1. Do I release pressure by utilising filling loop and draining down via it to just below top floor level after turning valves of upstairs rads off. Is it then refilled by loop and venting through the new upstairs rad's bleeding valve.
2. I have found that prior to my occupancy an extension was built where the rad therein was connected via downstairs cloakroom rad. This I now find is not on main central heating but on hot water system (vented) along with two bathrooms upstairs. I want to take this off hot water and put it onto central heating (so it can be controlled with rest of house heating) This will still leave the upstairs bathrooms as they are. Do I have to drain down the hot water indirect feed and if so how, again I will only need to drain just below upstairs floor level. If so how do I refill, reprime it.
Tnanks again in anticipation as you solved my problems really well a couple of years ago! Hope I have not put too much info in.
1. Do I release pressure by utilising filling loop and draining down via it to just below top floor level after turning valves of upstairs rads off. Is it then refilled by loop and venting through the new upstairs rad's bleeding valve.
2. I have found that prior to my occupancy an extension was built where the rad therein was connected via downstairs cloakroom rad. This I now find is not on main central heating but on hot water system (vented) along with two bathrooms upstairs. I want to take this off hot water and put it onto central heating (so it can be controlled with rest of house heating) This will still leave the upstairs bathrooms as they are. Do I have to drain down the hot water indirect feed and if so how, again I will only need to drain just below upstairs floor level. If so how do I refill, reprime it.
Tnanks again in anticipation as you solved my problems really well a couple of years ago! Hope I have not put too much info in.