nest Learning thermostat, Installation Manual

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2. Connect to power and the control circuit
Check the heating system’s wiring to determine what
type it is .
Remove the Heat Link cover and connect the L (live) and
N (neutral) terminals on the Heat Link to the L and N
circuit on the boiler or junction box . This will power the
Heat Link .
Connect the heating control circuit to the Heat Link
1 (normally closed/satisfied), 2 (common), 3 (normally
open/call-for-heat) as needed .
If the system has a hot water control circuit, connect it
to 4 (normally closed/satisfied), 5 (common), 6 (normally
open/call-for-heat) as needed .
If you have an OpenTherm boiler, connect its control
circuit to the OT1 and OT2 terminals .
→ See pages 136-141 for detailed wiring diagrams .
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