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wiring horstmann centaurstat 7?

swapping honeywell stat to horstman, two wires i presume live and swithed,the centaurstat 7 has 1234 could you please advise is 1 live and 3 swich

kev
October 2013

Horstmann Heating, Home Heating Systems Wiring Stat Wires

1 is live
2 is heat demand (switch live)
3 is cooling (switch live)

so if your using it for central heating it would be live in 1 and switch live in 2
if your using it for an air con then live is 1 and switch live is 3

you need live in 1 and switch live in 2

kash
October 2013

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