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manifold

In mathematics, a manifold is a topological space that locally resembles Euclidean space near each point. More precisely, an n-dimensional manifold, or n-manifold for short, is a topological space with the property that each point has a neighborhood that is homeomorphic to an open subset of n-dimensional Euclidean space.
One-dimensional manifolds include lines and circles, but not figure eights. Two-dimensional manifolds are also called surfaces. Examples include the plane, the sphere, and the torus, and also the Klein bottle and real projective plane.
The concept of a manifold is central to many parts of geometry and modern mathematical physics because it allows complicated structures to be described in terms of well-understood topological properties of simpler spaces. Manifolds naturally arise as solution sets of systems of equations and as graphs of functions. The concept has applications in computer-graphics and augmented-reality given the need to associate pictures with coordinates (e.g. CT scans).
Manifolds can be equipped with additional structure. One important class of manifolds are differentiable manifolds; their differentiable structure allows calculus to be done. A Riemannian metric on a manifold allows distances and angles to be measured. Symplectic manifolds serve as the phase spaces in the Hamiltonian formalism of classical mechanics, while four-dimensional Lorentzian manifolds model spacetime in general relativity.
The study of manifolds requires working knowledge of calculus and topology.

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  1. B

    No power to Manifold

    Hi folks, hoping someone can help with a problem that's been perplexing me since just before Christmas..... I have a wet underfloor heating system installed in 2003 and manufactured by Underfloor Direct in NI - Now out of business. It's one of their triple tube systems and hasn't given me much...
  2. S

    Connecting radiators to UFH Manifold?

    Hi Everyone I wasn’t sure whether to post this in here or UFH but hopefully I’m posting this in the correct group. I’m in the throes of a full renovation and am currently designing the central heating system, I’m installing radiators (11 or 12 in total) and am going to run each rad from its...
  3. D

    Can I add another radiator on this microbore manifold?

    I have what appears to be a single pipe system? with microbore manifold downstairs, and I'm assuming another upstairs under floorboards, both with 3 radiators. The photo shows the downstairs manifold, and looking at the way the other radiators are connected, is there any reason why connecting...
  4. S

    How to replace UFH return pin valve

    Hello, I have UFH set up with a HIU in my flat. My issue is that one zone (Bedroom 2) does not heat up. All other zones working and heating as expected. Have checked the relevant thermostat, as well as the electrical actuator for the specific zone. Both look ok Checked return pin valve -...
  5. C

    Can't find UFH manifold vent/drain valve

    Hi all, I can't locate the vent/drain valve on this manifold. My manifold resembles the "UFH Manifold RUB-RT1tm4" model on this webpage: https://www.thermo-floor.co.uk/underfloor-heating-manifolds.html I an intending to replace on the the actuator pin-valves and I think I need to drain (or at...
  6. K

    Underfloor heating manifold

    Hi all. We have underfloor heating on a couple of levels in our house. One floor was not heating and I asked advice from a plumber we have used before. I sent him pictures of the manifold in question. While this was going on I switched off fuses and replaced batteries etc. The heating has kicked...
  7. A

    Wunda manifold upgrade

    Hi guys - hoping someone can help... Have a 12 yr old Wunda 2-zone wet underfloor heating system which is starting to fail (zone heating up despite stat being off) and a generally old and inefficient thermostat system. Difficult currently to get anyone to come have a look at it, managed to get...
  8. M

    Sourcing replacement manifold actuator valves

    Hi, we had underfloor heating installed about 15 years ago. Some of the actuator valves are now leaking and we need to replace them. I'm trying to source some that fit. The plastic caps which came with the originals had the 'Watts' brand on. I've tried ordering a couple of the most common valves...
  9. L

    Underfloor Heating Manifold - what brand?

    Hi, I am trying to see if anyone recognises the brand of this underfloor heating manifold? I think it's about 22 years old. I'm trying to get more details to see if I can change the faulty actuator. Any suggestions welcome. Many thanks, Mark
  10. F

    Help on pipework from boiler to manifold.

    Hello, I need some advice. Can anyone tell me if this installation is done correctly? We had a plumber who installed the UFH. Then couple of weeks later different plumber came to do boiler service. Straight away said that the pipe work is wrong. I don't have any knowledge on this so I would...
  11. J

    70s Renovation - Radiator Manifold

    Hi all, I am currently renovating our 70s house a room at a time. It currently has single pipe central heating, heat only boiler and indirect cylinder with F&E tank. It's a noisy system and even when balanced, the last radiators take a while to get hot. I'm also getting air in from somewhere...
  12. D

    Manifold to radiator feed using Hep2O and elbows

    Hello All Its my first jobbie using Hep2O. Im installing a vertical mounted radiator manifold, and the feeds to wall mounter radiators. Im using Hep2O barrier pipe the HXX100/15W. Q1 Is there an issue using elbows in a plastic 15mm barrier radiator feeds - i.e some bore constriction issue Im...
  13. R

    Actuators/Zone valve compatibility with Manifold

    Hi, I am in the process of setting up underfloor heating in my home. I have used polypipe overlay plus underlays and 12 mm polypipe pipe for running hot water as advised by my builder. Due to this I now have to get a polypipe manifold as there are no other fittings which would allow me to...
  14. M

    UFH not working - suspect issues at manifold

    Hello As per title, the 3 zones of UFH to one manifold are not working. All is good from an electrical perspective, i.e. the room thermostats are calling for heat, the UFH wiring centre is triggering the boiler, but simply no heat is coming from the floor. What makes analysis difficult is 1)...
  15. B

    Vaillant 630 weeping cracked plastic manifold

    Hi All - has anyone else had weeping from a hairline crack in the black plastic manifold where the flow comes out of the burner? See pic. Looks like you can replace the whole thing, but can’t find a part number. Can anyone help? Might just be calling it the wrong thing!? Thanks, Andy
  16. A

    Looking for a specific flow meter for UFH manifold

    Hi. I need to get a replacement flow meter as one has split and is leaking. I can’t seem to find the specific one and can’t see a maker on it. Does anyone know where to get one, what it is or any alternatives? Thanks.
  17. C

    UFH manifold air vent dribbling

    Having recently replaced one of the flowmeters on our UFH manifold, why would water slowly dribble out of the air vent?
  18. J

    Radiator Manifold question

    Hi, if you're installing a manifold to serve each room as it's own zone can you join all rads in that zone from the same port on the manifold? For example, I've got 14 rads downstairs, there is 2 in the living room. My manifold ports are just 16mm, can I run pipe from 1 port to both these rads...
  19. J

    Leaking UFH Manifold

    Hi, we have a leak from the underfloor heating manifold. It appears to be leaking from one of the thermal actuators (please see photos). It’s leaking about a cupful every day. So far, I’ve talked to about 10 local plumbers:– Contacted original installer. The admin person kept telling me that...
  20. R

    Pulsar direct TRV pin leaking looking for spares

    I have a client with 5 manifolds that are Pulsar Direct supplied .I know Pulsar direct are no longer. I have a few with leaking TRV (RBM -TL50) pins. How easy is it to change the pin side of the valve. . Are they standard or specific to the manifold? Where would I look for spares. Just had 'we...
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