S plan heating system

What are the different types of heating systems in the UK? Overview of an ‘S’ plan heating system: 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. 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. S plan Port Valve.

The valve has two plumbing connections - in and out. With no power applie a spring holds the valve. This diagram shows the wiring layout. 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. This can be a baffling and somewhat disconcerting experience for the consumer. It can also give rise to other faults, such as overheating of the boiler if firing around the bypass circuit only.

The Y Plan has one three port mid-position valve supplying heating and hot water for domestic use, as shown below: The S Plan has two separate port motorized valves, one for central heating and one for domestic hot water.

These two valves can be independently controlled and switche as seen in the example below. System Wiring Diagrams.

Showing flow from boiler, to Y Plan, or Mid Position Diverter Valve, and then onto heating or hot water circuit. The C Plan is a method of installing thermostatic control on both hot water and room heating zones on a semi-gravity system. Matthew from Boiler Boffin explains how an S-Plan heating system is wired and how the system works.

Electrical wiring for central heating systems. One valve for hot water. Trying to fix a problem on a s-plan heating system.

Boiler is working fine, only problem is heating and hot water are not working at the same time. If we turn the heating off, then hot water starts working. Looks like a problem with one of the 2-port valves.

In S - plan systems or where the boiler manufacturer specifies a bypass loop such an always-on radiator may be connected directly across the boiler flow and return, before the zone valve( s ). As a matter of design choice a bathroom towel radiator can be connected directly across boiler flow and return, before zone valves, to allow towels to be dried and warmed when either space heating or DHW re- heating is in operation. I hate to see badly designed pipework and wiring.

Pumps hanging mid air and motorised valves that are hidden behind cylinders - think of the future maintenance! There is often great confusion regarding the wiring of central heating systems. The two most common are known as S Plan and Y Plan.

S Plan Central Heating Wiring Diagram Central Heating Controls and Zoning Diy.

It shows the components of the circuit as simplified shapes, and the facility and signal associates between the devices. The three main options for heating emitters are: Underfloor heating : This tends to be the emitter of choice for many self builders and extenders, for the comfort.

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.

The circulation from a boiler around the radiators is the central heating system. The water to your taps is the domestic hot water. Although both share some of the main components in the heating system, the water and pipework is not mixed.

What to check if your heating or hot water is not working. Use this step by step guide to central heating fault finding and fault repair and identify why your hot water or heating is not working quickly and easily.