Draining system

[Graham22]

I need to drain down the system and may have to do this a few times. I was wondering if I could save some time, and also money on inhibitor, if I closed all the radiator valves to reduce the amount of water that drains out.
Is this Ok, or will it lead to air lock problems etc?

One reason I want to drain down is we had a problem with pipes in the concrete floor in kitchen leaking. The leak is fixed but I want to replace the pipes as they seem to have taken a bit of a hammering from a power flush. I may not have time to do it before we go away so I was thinking I might put a valve on both flow and return to isolate the feed to the two radiators under the concrete floor, in case we haave a leak when away. Again is there any problem with doing that?
Many thanks.

 

[jackthom]

Closing down the radiators is a good way of limiting the amount of water to drain and shouldn't cause any problems, except that having upset all the lockshield positions you'll probably need to rebalance the system afterwards.

Isolating valves for closing off part of the system can be very useful. I now have a few of these at home.

Untitled

• jackthom
• 25 Nov 2013
• 1

 

[Graham22]

Many thanks for the thums up.

 

[Terry lambert]

Partial draining can lead to airlocks.

 

[Terry lambert]

These can normally be cleared though