Mains Flush Toilet

[tricky4000]

Hi guys,
We have a Reece branded mains flush toilet system and there just doesn't seem to be enough water pressure being pushed out into the pan.
See http://www.reece.com.au/bathrooms/products/toilets_&_bidets/mainsflush

Sometimes those numbers twos take two flushes to go down. Its all connected properly, 3/4" copper all the way from main to inlet. The 24lt Davey pressure vessel is charged with enough compressed air, valve deploys when button is pressed...but pressure...very faint. It also has a non return valve to stop pressurised water returning back into the pipes.

Any ideas about this people? Any plumbers out there that are experts one these? I'd like to learn more. I can't think of any other solutions. If you have detailed questions about my install, please ask because I'm keen to get it sorted out.

The 50mm diametre Gerberet pipe run from the pressure vessel to the pan is actually very short which should mean a much more intense shot of water when flushed...but it is far from this.

Any advice would be greatly appreciated.

Dan

[familyguy]

Don't know much about the mains flush systems, but this is just a thought. A regular cistern and pan setup operates on volume of water, if you have an older pan and replace the cistern you need to get a 4.5l/9l type dual flush cistern a 3/6lt type is no good, won't flush away the solid stuff. Perhaps your problem is lack of volume of water, the pipe run in the brochure looks fairly long giving a decent volume for the flush, maybe your pipe run from the pressure vessel is too short, or another thought is the mainsflush valve staying open long enough for a decent volume of water to flush everything away.

[wonderplumb]

3/4 sounds a bit small, of the couple ive put in, one had a 1" feed to the pan and the other had a break tank in the ceiling, and the same for a few others ive had to service. That 2" geberit pipe you talk about should be longer by the sounds of it, the higher it is above the pan the more pressure you will get at the pan.

[tricky4000]

Sounds about right. The Gerbret pipe length is definitely not correct. It is sitting shorizontal (about 550mm in length) with a 90 degree angle right in the middle of it. Do you know Reece told me that this pressure vessel can also be installed under the house (underneath the toilet...this I don't believe. Now, it does state in the installation guide that in a domestic installation 3/4" copper is fine so long as the pressure is > or = 500kPa.
I will check the valve, there's probably some crap caught in it. I need to buy some silicone grease before I pull it apart though.
To family guy, I'm sure the pan fits the criteria you talked about. It is also new and sold to me with the flush system. I will double check however just to be sure.
Thanks again peeps.
Dan.

[familyguy]

tricky
I wasn't implying that the pan and flush system were unmatched, my words were just to illustrate that what your system might be lacking is volume or amount of water for the flush. I guess you need pressure but all the pressure in the world won't flush the pan if there's not enough water, which may be caused by short pipe runs (longer pipe run = more volume). We all know that when the cistern packs up a bucket of water does the job, not much pressure there but plenty of water volume.

[familyguy]

By the way good luck with it, I'm sure you 'll get it sorted out.

[tricky4000]

Makes sense FG.
Thanks