The terminals for the room thermostat should be marked TA. They are numbered
22 and 23 on the MK2. Remove the wired link between these teminals and
connect the room stat to these terminals
The SIME home page is at
0.75mm heat resistant flex for the final connection to the boiler. You can
use normal PVC cable for the run to the thermostat and join it to the flex
with a junction box or just run flex all the way. If the thermostat contacts
are mains voltage then you need 3 core flex so that one core is used for the
earth. If the thermostat also needs a neutral you would need 4 core flex.
Available by the metre at most electrical wholesalers.
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