On 29 Dec 2005 13:51:09 -0800, "htmark98"
wrote:

Cheers andy will look at those, i roughly know how to drain the system,
but people recommend to clean the system, how does one do this?

The simple way is to successively drain and refill the system.
However, this will only dissolve and remove chemicals such as flux
from soldering. You can add a flushing agent and run the system hot
for a week or so and then drain, flush and refill, adding inhibitor.

If the system is reasonably new and clean and no sign of sludge, black
water or other crap, then that would be good enough.

If there is sign of crud in the system, then plan B is to flush at
each radiator.

Here are the steps:

- Drain the system.

- Take radiators off one at a time by undoing valve unions. Close
valves. Place containers under each radiator valve union. Make sure
you use plenty of old towels, newspaper and a plastic sheet. Sludge
contains iron compounds which dye indellibly. Tip remaining water in
radiator carefully into tray and then attach a plastic bag to each
tail with a rubber band.

- Take radiators outside and flush with a mains hose or pressure
washer, tapping them gently as you do to loosen any crud inside.

- Put small containers under each radiator valve and turn on the water
slowly. Check that there are not any which leak badly.

- With water still on and larger container under radiator valve (cat
litter trays are good for this), open the valve and allow flushing out
until water is clear. Close valve and repeat for all valves. The
benefit of the approach is that crud can only leave the system, not be
circulated.

- Refit radiators and refill system adding inhibitor.

An alternative is to rent a power flushing machine. This avoids
needing to remove the radiators.....



--

..andy