If a combi boiler is drained for the replacement of a part, is refilling the boiler a technical process?
Or is it fairly simple to do?
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6 Responses to “If a combi boiler is drained for the replacement of a part, is refilling the boiler a technical process?”
No, it’s easy, nut be sure to bleed radiators and other bleed points to remove trapped air, and allow system to be completely filled
It is only classed as a technical process when a thieving plumber is trying to charge you a fortune to do it
if you can turn a tap on and bleed air from rads it’s easy if you can’t it’s hard
Very easy but quite slow. Open the bleed points on the upstairs radiators and the system will fill evenly. Shut the bleeds when the water reaches them of course. If the pump is accessible loosen the big screw head on the top of it and the will bleed air from the pump. When you think the system is full and the noise of entering water stops then go around to all of the upstairs radiators and check that there is no further trapped air.
No,if the bleed valves on the radiators were not opened when the system was drained then the rads should be still full off water.Open the filling loop under the boiler to charge up the pressure,all combi’s are fitted with auto air valves inside them for self venting.Once the pressure is up to one bar go around the upstairs rads venting any air from them,then recharge the pressure as req’d.
If the system was drained completely and you need to vent all the radiators,start with the down stairs first and work your way upstairs.You will also need to add an inhibitor to the system.
Depends on the part being fitted, but it may not need to be drained in the first place. It may still be possible to isolate the boiler by closing valves, and so it would not be necessary to drain the whole system.