The s plan is popular because it is versatile you can add an unlimited number of zones simple. Instead of just having one zone for the hot water cylinder and one for the radiators you can use another 2 port valve with its own controlling thermostat and power.
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S plan zone valve wiring. The third valve thermostat has a three core and earth wire. Have three valves hw upstairs and downstairs ch. The y plan has one three port mid position valve supplying heating and hot water for domestic use as shown below. A great advantage of s plan systems over y plan systems is the opportunity to have more than two zones. The s plan has two separate 2 port motorized valves one for central heating and one for domestic hot water. V4073a y plan how a mid position valve operates within a y plan heating system how a w plan heating system operates faq pump overrun wiring diagrams for s plan incorporating a st9400 programmer faq pump overrun wiring diagrams for s plan plus incorporating separate diagrams with st9100 time switch and st9400 programmer.
For more information. 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. Got 2 valves wired as per honeywell diagram all honeywell parts. Wired my s plan plus but not 100 on the extra zone valve and thermotsat wiring. Standard dial thermostats may be power from a time clock. The sundial s plan plus satisfies the minimum requirements of building regulations part l1 for dwellings over 150m².
This scheme uses separate two port valves one for hot water and another for heating. This includes their plumbing their wiring how they are controlled with time clock programmers and thermostats. Wundafloor programmable thermostat s plan wiring centre s plan wiring centre 2b typical wiring scheme for multi zone ufh with a combination boiler 3b typical wiring scheme for single zone ufh. One valve for hot water another for heating. This video covers s plan heating systems and 2 port valves. Electrical wiring for central heating systems.
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 system provides independent time and temperature control of multiple heating circuits and a separate hot water circuit in fully pumped systems. The basic difference between the y plan and the s plan is the type of valves used in the pipework. Zone valve radiators thermostat may be powered from a seperated localised fused spur. Part 2 in the series looks at s plan wiring a system which uses two separate valves.
Gallery of S Plan Zone Valve Wiring
