nest Learning thermostat - How To Quick Reference Guide; Initial Nest Configuration and System Detection; Pro Setup for HVAC System Control; Basic Operation Testing After Installation

Y-plan
L
N
Zone valve Hot water tankBoiler
12 V
3 A
230 V AC/50 Hz
N L 1 2 3 4 5 6 OT1 OT2 T1 T2
WLN
2
1
Com
GRBL O
Input power
Wiring specs
23