S plan heating system pipe layout

An S-Plan heating system is a system that uses zone-valves (also known as 2-ports) S-Plan heating systems are now the most common type of system installed in the UK after Combination boiler systems (which do not have any external motorised valves). The S-plan is popular because it is versatile (you can add an unlimited number of zones), simple to wire, and easy to fault find on.

It can be easily extended to include additional heating zones by adding an extra valve and room thermostat for each zone - this is typically called S Plan Plus. The reason this system is called a ‘S’ plan heating system is because of the shape of the system when drawn schematically.

Heated water from the boiler is diverted to the hot water coil or the radiators depending on which service the programmer is asking for and which thermostat is calling for heat. The port valves serve one service each.

Can high level feed pipes be insulated? The S Plan Plus design is recommended if your central heating design heating zone (floor area) is greater than 150m2.

The HWC has to be fitted higher than the boiler for this to work. Note the tee rule has been broken ( The hot water should be the tee nearest on the return from boiler). In my case because of zoning the hot water return is furthest from the boiler.

On my layout - looking at returns. CENTRAL HEATING SYSTEM DESIGN - Y Plan - S Plan - Gravity - Combi Boilers.

A water central heating system consists of basically the boiler, the radiators and the interconnecting piping.

The boiler heats the water and (normally) a pump circulates the water through the pipework and radiators and back to the boiler. Slightly simplified pipe layout for Y. No bypass required for Y as there is always one of three routes available at any one time.

Few quid cheaper for Y, as a single port valve is cheaper than the pair of ports needed for S Plan. The open vented system is fed from a feed and expansion tank located in the loft, this keeps the system topped up and also allows the water to expand as it heats up.

There is also a vent line that releases any air in the system and returns any water or steam to the top of the expansion tank, in the event of the system overheating. There is often great confusion regarding the wiring of central heating systems.

The two most common are known as S Plan and Y Plan. The S Plan has two SEPARATE motorised valves, one for heating and one for hot water. These two valves can be independently controlled and switched.

One pipe central heating systems. Two pipe central heating systems. Central heating des.

The diagram below shows an example of a pipe layout for a ground floor including suggested loop-lengths and manifold positioning. Underfloor heating pipe should be laid at 200mm centres dependent upon design.

In this short article we look at pre-insulated pipe layout principles when designing a district heating scheme and the pros and cons of the various options. Designing the pipe network.

At the largest scale there are two commonly used designs for the network, the ‘radial’ system and the ‘ring system’. The Sundial S Plan is designed to provide independent time and temperature control of both heating and hot water circuits in fully pumped central heating installations. Sundial S Plan satisfies the requirements of the Building Regulations Part Lwhen used in conjunction with radiator thermostats and Automatic Bypass Valve.

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Cross-linked polyethylene (PE-X) is most commonly use but polybutylene (PB) is also covered by the standard. Pre-insulated flexible pipe systems. Well, we feel warm enough in the house, but for the size of boiler and relative small size of property, the heating does seem to take a while to get to temperature. Here is the picture of the current layout.

Where the pipe comes down from the loft in 22mm is in the top left, everything in this picture is 15mm. Commission the central heating system by closing all of the vents on the radiators, filling the system with water and allowing each radiator to vent through. Activate the heating pump and re-vent the system.

Then switch on the boiler and balance the flow of heated water to each radiator by using the lock shield valves. This is the proposed new.