Connectors
Wiring Centre 16 (lever connectors)
In short
A DrawWarm wiring centre with 16 lever-connector blocks round three sides. Its terminals: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
If this is your home: this page is written for heating engineers. Mains wiring and gas appliances are not DIY jobs; call a Gas Safe registered engineer. If you smell gas, leave the building and call the National Gas Emergency Service on 0800 111 999.
What it is
A WIRING CENTRE is the box where the wires of a heating system meet and are joined. This DrawWarm one has 16 blocks of LEVER CONNECTORS round three sides of the box:
- 1 to 4 along the top.
- 5 to 10 down the right side.
- 11 to 16 down the left side.
Each block is one connector. Lift a lever, push the stripped core into the hole, then press the lever down. Every wire on a block is joined to every other wire on that block. No block is joined to any other.
The holes face the middle, where the cables come in through the GROMMETS.
Blocks 1, 2 and 3 have five levers, and the others fewer. The numbers are a habit that helps, not a rule the box knows.
Terminals
| Terminal | What it is for |
|---|---|
| 1 | Block 1. |
| 2 | Block 2. |
| 3 | Block 3. |
| 4 | Block 4. |
| 5 | Block 5. |
| 6 | Block 6. |
| 7 | Block 7. |
| 8 | Block 8. |
| 9 | Block 9. |
| 10 | Block 10. |
| 11 | Block 11. |
| 12 | Block 12. |
| 13 | Block 13. |
| 14 | Block 14. |
| 15 | Block 15. |
| 16 | Block 16. |
What the meter reads
The Draw Warm Method numbers the blocks:
- 1: the live (L).
- 2: the neutral (N).
- 3: the earth (E).
- 4: the central heating (CH) demand, to the room thermostat (stat).
- 5: the call of the room thermostat.
- 6: the hot water (HW) demand, to the cylinder thermostat.
- 7: the Y-Plan's grey.
- 8: the call of the cylinder thermostat. A Y-Plan's orange is on 8 too.
- 10: the S-Plan's oranges, to the boiler's switched live (SL).
DrawWarm's lessons use block 9 for a second heating zone's call.
The numbering is a habit: read the schedule, never assume.
Where it connects
Also in connectors
Practise it in the simulator.
Runs in the browser on a laptop or desktop. Cancel any time.