Wireless differential pressure sensor, surface-mounted BL220DDa

• For installation in the installation room
• Can be installed and operated in different operating modes
• Monitors the permissible differential pressure (Pa) between:
- Installation room and chimney (SD), negative pressure in the exhaust system of 4 Pa is a prerequisite
- Installation room of the fireplace and outside pressure (AD), negative pressure in the installation room of max. 4 Pa is permissible in ambient-air-independent operation.
- Installation room of the fireplace and outside pressure (AD), negative pressure in the installation room of max. 8 Pa is permissible in ambient-air-independent operation.
• If the permissible negative pressure is maintained, corresponding enabling signals are sent to the respective receiver