lastminute
Established Member
..as above, instead of draining the system.!
porker":10dcnyci said:I had a system in the past which I avoided draining down at all costs because getting an air lock out afterwards was so difficult. It was a gravity system so I used to use bungs in the header tank and overflow and that would hold most of the water by creating a vacuum in the system. For the radiator I used to tighten the lockshield on the opposite end to the TRV and then using a wet vac crack the joint on the valve. I could suck every drop out of the radiator without getting any on the floor (but would still pack underneath with rags just in case). If you do try freezer spray make sure the system is cold by turning off the CH well in advance. Sometimes the pipes feel cool but the water is not. Then use a whole can on a 15mm pipe. I've had mixed results so if the flooring is not water resistant (i.e. carpet) I would be very wary.
If draining down and refilling is not a problem though, this will always be the safest option.
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