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The receiver unit controls the boiler or air conditioner
through a potential-free alternating relay whose connection
points are: 1 (NO), 2 (COM) and 3 (NC). Connect the two
connection points of the heating or cooling equipment to
be controlled to the normally open 1 (NO) and 2 (COM)
terminals of the relay, as shown on the below gure.
230 V AC, 50 Hz
230 V AC
50 Hz
LN
1
2 3
NO COM NC
Rear panel of
the receiver
unit
Heating unit (boiler)
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