If the property uses a combi boiler rather than a heat only boiler the boiler will usually contain a diverter valve. The y plan has one three port mid position valve supplying heating and hot water for domestic use as shown below.
Honeywell Thermostat Wiring Diagram 2wire System Wiring
Honeywell y plan valve wiring diagram. The basic difference between the y plan and the s plan is the type of valves used in the pipework. In the past this was by far the most common setup as it only requires one valve. This scheme uses a 3 port mid position valve. Part 3 in the series looks at y plan wiring a system which uses a single 3 port valve. Part 4 in the heating wiring series covers how the 3 port mid position valve works internally allowing 3 separate positions from only 2 mains inputs. The s plan has two separate 2 port motorized valves one for central heating and one for domestic hot water.
This has one inlet and two outlets one for hot water the. As can be seen from the y plan wiring diagram above the switched output from the room stat connects directly with the heating white connection to the motorized valve. Work safely please note we. The y6630d is a battery powered wireless room thermostat and mains powered hc60ng receiver box pre bound to give intelligent room temperature control of a single zone. Sundial y plan satisfies the minimum standard requirements of the building regulations part l1 when used in conjunction with radiator thermostats and an automatic bypass valve. The sundial y plan is designed to provide independent temperature control of both heating and domestic hot water circuits in fully pumped central heating installations.
3 port valve operation. The valve itself has three plumbing connections in out a and out b. Electrical wiring for central heating systems. Figures f 5 10 to connect the wireless relay box to your. Central heating wiring diagrams honeywell central heating wiring diagrams sundial y plan please note we do not accept any responsibility for the accuracy of any of the diagrams literature or manuals and information may have been supercededamendedwork must be completed by qualified electricians or heating engineers. Heating controls wiring guide issue 17 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.
The y plan and s plan names are more commonly used when other honeywell controls are also used programmer room thermostat cylinder thermostat and wiring centre. Bdr91 to your boiler zone valve or sundial valve 1 ount the wireless relay box on a non metal surface at least m 30cm from your boiler other wireless device or metal objects 2 elease the clip on the bottom to open the front coverr 3 ollow the wiring diagram see appendix. It can still be fitted today however is not suitable for systems with more than one heating zone.
Gallery of Honeywell Y Plan Valve Wiring Diagram
