SIEMENS RAA21 Room thermostat

SIEMENS RAA21 Room thermostat
The RAA21 thermostat is used for room temperature regulation in heating or cooling systems. The RAA21.. thermostat has separate output terminals for either heating or cooling. If the room temperature falls below the set value, the contact of the output for heating is closed. If the room temperature exceeds the set value, the cooling output contact is closed.

Typical uses:
- residential buildings
- light industrial operations
- the thermostat is used in conjunction with the following devices:
- zone valves or thermoelectric valve drives
- gas or oil boiler burners
- ventilators
- pumps