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