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Central heating
Learning Thermostat - Smart thermostat - Black
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Low vo
lta
ge/
dr
y
con
t
ac
t c
ombi b
oiler
L
N
Boile
r
1
2 V
3
A
230
V
AC
/
50 H
z
N
L
1
2
3
4
5
6
OT1
OT2
T1
T2
A
B
Inp
ut p
owe
r
Wiring sp
ec
s
21
1
...
...
19
20
21
22
23
...
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