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Wiring a Horstmann HRT4-B

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10 Mar 2013
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Replacing existing thermostat where Blue wire goes to 2, yellow to 3 and red to 1 terminal. Which wires are needed to wire in Horstmann hrt4-b
 
red to 1

yellow to 4

isolate the blue and make safe.

this is assuming you have a honeywell roomstat a the moment.
 

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