Hi there..

I know there are a few posts in this group realting to this topic, but
I wanted an idea of doing the whole job...

I've got a pretty old gravity ho****er setup with 15mm pipes to the
rads. I have already bought a few thermostatic vavles and need some
advice on fitting.. I've found a drain point near my boiler - and I
know I'll need to protect the carpet when I loosen the pipes to the
rads...but here's a few things I'm not sure on..

Do I just drain down the whole system and then start fitting the
vavles?
Do I need to remove the radiator to fit the valve?
Each rad has a control knob to turn off the water to the rad - do I
replace these with the vavles, or do they go on the other side of the
rad?
Should I refill the system with an inhibitor and cleaning solution?
Do I need to fit the valves to radiators in any order and do I need to
carry out any procedure to refil other than make sure all vavles are
fitted then turn on the water?

Thanks alot!

Simon

Personally, I haven't drained down the system on two TRV replacements
(different properties). You can buy a 'kit' from the plumbers merchant
which is basically two rubber bungs, to seal up the system at the expansion
tank to create a vacuum. This allows you to open the system up at ONE
point, e.g. remove a single valve from a radiator, with the other radiator
control valve turned OFF (recommend draining down the radiator first
though). The vacuum created holds the water in the system and allows you to
work on replacing the valve.

This has worked very well, many times for me.

Paul R

"Simon C" wrote in message
om...
Hi there..

I know there are a few posts in this group realting to this topic, but
I wanted an idea of doing the whole job...

I've got a pretty old gravity ho****er setup with 15mm pipes to the
rads. I have already bought a few thermostatic vavles and need some
advice on fitting.. I've found a drain point near my boiler - and I
know I'll need to protect the carpet when I loosen the pipes to the
rads...but here's a few things I'm not sure on..

Do I just drain down the whole system and then start fitting the
vavles?
Do I need to remove the radiator to fit the valve?
Each rad has a control knob to turn off the water to the rad - do I
replace these with the vavles, or do they go on the other side of the
rad?
Should I refill the system with an inhibitor and cleaning solution?
Do I need to fit the valves to radiators in any order and do I need to
carry out any procedure to refil other than make sure all vavles are
fitted then turn on the water?

Thanks alot!

Simon


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