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3.6 Optional Programmer (PU1) for Non-Combi Models
3.6.1 Programmer Control Box Wiring Diagram
3.6.2 General Requirements
1. The optional programmer as supplied will supply power to the pump and burner via
the central heating channel.
2. When connecting to external controls, eg ‘Y’ plan or ‘S’ plan it will be necessary to
remove the loop between 3 and 12 on the programmer terminal block.
3. The programmer is not suitable for gravity hot water systems.
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