room stat on a Potterton FSB

4 Dec 2010
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United Kingdom
Hi all,

First post!

looking to add a room stat to a Potterton Promax FSB 30HE. There is one in the wall presently but it is not connected (3 core). The system is pumped open vented with the pump wired into the 4 core Boiler Connector. No separate HW/CH or anything fancy like Y/S plan.

Could the room stat be connected to the boiler connector to provide on demand CH?

Any advice would be appreciated! ;)

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Thanks for the respose!

so putting the thermostat on the switched live is using it like a switch... :)

The current room stat is some form of Eberle and my feeling is that it should be repalced - it appears to have a live (1) neutral (2), earth (E) and a second neutral (4).

If this was to be swapped out with a Honeywell CM907 (that seem highly recommended on this site) this should be able to be wired inline on the switched live in the way you suggest (my understanding is that this stat just requires a live and all others can be taped/capped)?

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