53
S 4 - RC21 IR Room Unit, wiring
RC21 IR Room unit can be connected to the Controller. It involves a temperature sensor,
keys for temperature correction and for a permanent temperature level, either Comfort or
Setback.
The room unit shall be wired to the Controller with a shielded twisted cable 4x0.5 or 3x0.5, or
4x0.78 or 3x0.75 (e.g. JYTY).
Terminal board description:
Room unit connection to the Controller:
Room unit in Zone 1:
Unit terminal 1 → IR12 terminal C6 (t11) (sensor 1)
Unit terminal 2 → IR 12 terminal C7 (t12) (Zone 1)
Unit terminal 3 → IR 12 terminals B1,C1 (T
GND
)
The RC21 sensor type needs to be enabled on the Service level.
