This is a new style Danfoss single channel programmer as shown in pictures 2 and 3. You can simply fit this new programmer onto your old TS7899 backplate with no wiring needed. Please note that the TS7899 is a discontinued model and the programmer we have is a direct replacement for it. Please review pictures and ask any questions you might have, we are happy to help where we can. Dispatched with royal mail asap
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