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    ACL RTS-1 to Horstmann HRT4-B thermostat wiring advice?

    Many thanks for that :D
  2. A

    ACL RTS-1 to Horstmann HRT4-B thermostat wiring advice?

    Hi, I have an existing (ACL Drayton) Room Thermostat RTS-1 and would like to know if it is at all possible to replace it with a Horstmann HRT4-B without requiring additional wiring? If it is possible what are the wiring terminal connections I need to make? Grateful thanks in advance...
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