Draining down CH system

sbigland · 19 Aug 2006

I've got quite a few jobs to get done over the next few weeks and it looks like I'll be draining down the CH system (and I've never worked on a CH system before). It may very well be 4-5 weeks before I'm in a position to re-commission.

Is there any risk that leaving the system drained for so long will result in any damage to the pump? Or anything else for that matter.

Fluffster · 19 Aug 2006

You may get some corrosion if air is allowed into the system.
Make sure you flush it out and add fresh inhibitor when you are refilling.
The pump should be fine.
Pete

sbigland · 21 Aug 2006

Hi Fluffster - thanks for taking the time to reply.

Softus · 22 Aug 2006

Corrosion happens mainly using the oxygen content in the water, not from air that hasn't been vented.

For the sake of £15 to £20, I wouldn't leave a system unprotected for more than a few hours.

Often, with repeated drain downs, you can isolate enough parts of the system (all rads for example) such that a very small amount of inhibitor is lost, still leaving a strong enough concentration to do the job.

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Draining down CH system

sbigland

Fluffster

sbigland

Softus

DIYnot Local

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