PP 45 HYI internal humidity sensor
- PP 45 HYI = Accessories for internal humidity sensor
- Connection generally to the RLS 45 K master control unit.
ATTENTION: Unit damage/no function if the humidity sensor is installed incorrectly. Do not bend pins. Insert sensor up to stop in bush.

- Switch off the mains fuse and secure it against being switched on again.
- Carefully remove the outer frame of the RLS 45 K.
- Plug the PP 45 HYI internal humidity sensor into the I2C interface (arrow).
- Attach the outer frame. Ensure that the sensor opening is correctly positioned over the HYI and that the frame snaps into place.
- Start up the ventilation system and register the humidity sensor in the service menu, see setting parameters in the service menu.