Computherm Q7RF Operating Instructions Manual page 6

Rear panel of the
receiver unit
230 V AC
50-60 Hz
N
L (phase)
If you would like to operate an old boiler or any other de-
vice that has no connection points for thermostats, then
the No. 1 (NO) and No. 2 (COM) connection points of
the thermostat should be connected to the mains cable
of the device, similarly as a switch would be connected.
COM
NO NC
N L 1 2 3
- 6 -
Heating unit (boiler)
230 V AC, 50-60 Hz