Inside a clever Honeywell boiler wiring centre and a 3-way valve.

This unit is pure, simple genius. It's been around for a long time and has taken the complexity of wiring up traditional heating systems away completely, by providing a clearly marked set of terminals that results in very easy and neat wiring of heating systems.
The simplicity hides the fact that someone basically solved a complex wiring puzzle that allows well spaced connectors to be mounted on a simple single sided PCB. I bet they spent a lot of time doodling on a notepad and trying lots of combinations until they got it perfect.
It reminds me of a custom wiring PCB used by Unusual Rigging in a Disney attraction - that simplified wiring of computer controlled hoists, and also gave a lot of useful diagnostic indicator LEDs and test points for troubleshooting.

In the video I also dismantle and reverse engineer a three way valve as used with the wiring centre to show why it simplified the connections in a system that cut component costs by achieving a lot with a small number of components using devious trickery.

For more info on these systems, check out John Wards video on the Y-plan wiring system:-
https://www.youtube.com/watch?v=B7eAiiKUk2Y
John also has other videos covering the wiring of different heating systems.

The Honeywell wiring centre should prove an inspiration for use of custom marshalling PCBs in other applications. It's a simple concept that saves a lot of time when wiring equipment, and allows for easier troubleshooting and onboard diagnostics. (LEDs to confirm presence of power rails, show signals and indicate tripped protective devices.)

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