Y Plan Wiring Diagram

Y Plan wiring diagram for fully pumped central heating and hot water systems with pump overrun, includes connections for the boiler, 3 port valve, hot water tank stat, room thermostat and central heating wiring centre connections.

You can download the Y plan wiring diagram pdf at the bottom of this post.

Y Plan Wiring Centre Connections

The first number is the terminal number of the Y plan wiring centre.

1. Live In (From FCU) + Boiler Live (L) + Programmer Live (L)
2. Earth
3. Neutral
4. Room Stat Live ( terminal 1) + Programmer “CH On” (terminal 4)
5. Switched Live from Room Stat (3) + 3 Port Valve (Grey)
6. Programmer “HW On” (terminal 3) + Tank Stat Live (C)
7. Programmer “HW Off” (terminal 2) + Tank Stat Switched Live (SW2 – Terminal 2)
8. Boiler Switched Live (SL) + 3 Port Valve (Orange) + Tank Stat Switched Live (SW1 – Terminal 1)
9. Boiler Pump Live (PL) + Pump Live (L)

Y Plan Tank Stat Connections

Hot water tank thermostat wiring for hot water temperature control on Y Plan hot water systems.

• Live = L (C)
• Switched Live 1 = SL1 (1)
• Switched Live 2 = SL2 (2)

Y Plan Room Stat Connections

Room temperature thermostat wiring for room temperature control of the central heating system for Y Plan central heating systems.

• Live = L (1)
• Neutral = N (2)
• Switched Live = SL (3)

Y Plan 3 Port Valve Connections

3 port mid position valve wiring colours and Y plan wiring centre terminal numbers.

• Green/Yellow (Earth) = 2
• Blue (Neutral) = 3
• White = 5
• Grey = 7
• Orange = 8

Y Plan Boiler Connections

Y Plan boiler wiring diagram with pump overrun, shown below first is the cable (function) followed by the terminal number of the Y plan wiring centre.

• Live = 1
• Earth = 2
• Neutral = 3
• Pump Live (PL) = 9
• Switched Live (SL) = 8

Y Plan Programmer Connections

Y plan central heating & hot water programmer wiring diagram, shown below first is the cable (function) followed by the terminal number of the Y plan wiring centre.

• Live (L) = 1
• Earth (⏚) = 2
• Neutral (N) = 3
• CH (on) = 4
• HW (on) = 6
• HW (off) = 7

Y Plan Power Connections

Y plan power supply connections, shown below first is the cable (function) followed by the terminal number of the Y plan wiring centre.

• Live = 1
• Earth = 2
• Neutral = 3

Y Plan Wiring Diagram

Y Plan wiring diagram for fully pumped systems with pump overrun.

Note: Some earths have been omitted for clarity. Always check and follow the manufactures instructions as it may differ.

Downloads

Y Plan Wiring Diagram.pdf
Y Plan Wiring Schematic.pdf
Download this blog post: Y Plan Boiler Wiring.pdf