Secure C1727 Manual page 25

5.1.3 In case of surface wiring (optional)
Break the surface wiring knockout provided on the receiver before proceeding further
5.1.4 Make connections
In all the following cases for the C1727
•
Terminal 1 is hot water off
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Terminal 2 is the common
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Terminal 3 is heating zone 2 or hot water live, if installed
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Terminal 4 is the main heating live
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In a typical single heating zone system only terminals 2 and 4 are required.
25 of 40 BGX701-294-R03, PTD user manual Public