General specs
Heat Link
Terminal
L
N
1
2
3
4
5
6
OT1
OT2
T1
T2
Note: T1 and T2 have no polarity at the thermostat .
Maximum cable thickness = 2 mm²
AC power adaptor
Input: 100-240 V AC, 50/60 Hz, 0 .2 A | Output: 5 V DC, 1 .4 A
Specification
230 V AC/50 Hz mains voltage
230 V AC/50 Hz mains voltage
Heating relay normally closed/satisfied
Heating relay common
Heating relay normally open/call for heat
Hot water relay normally closed/satisfied
Hot water relay common
Hot water relay normally open/call for heat
OpenTherm wire 1
OpenTherm wire 2
If using T1 and T2, connect to earth
12 V DC power output to Nest
12 V DC power output to Nest
Notes
Live wire
Neutral wire
3 A resistive, 1 A inductive
3 A resistive, 1 A inductive
3 A resistive, 1 A inductive
3 A resistive, 1 A inductive
3 A resistive, 1 A inductive
3 A resistive, 1 A inductive
42 V DC max .
42 V DC max .
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