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Wiring diagram
2.7
Check your boiler wiring diagram for the connection
requirements. The wiring diagram below cover the most
common connection methods. Incorrect wiring can cause
damage to the boiler and the thermostat.
VOLT-FREE
BOILER
5
4
3
NO
COM NC
1. N: Mains AC Neutral
2. L: Mains AC Live
3. NC: Normally Closed
4. COM: Common
5. NO: Normally Open
2
1
L
N
Main Supply
230VAC
S/L (Switched Live)
BOILER
5
4
3
NO COM NC
2
1
L
N
Main Supply
230VAC
11
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