Siemens RAA 21

Product detailed description

Room thermostat Siemens RAA 21 

Room thermostat for heating or cooling. Features easy temperature setting via a rotary dial and a switching contact.

Use:

Residential or office buildings and spaces. Also suitable for controlling devices such as zone valves, thermoelectric valve actuators, gas or oil boiler burners, fans, and pumps. 

Features:

• Setpoint temperature range of 8 to 30 °C
• Easy temperature setting via the control dial
• Contact load rating 24 - 250VAC

Frequently Asked Questions

• How exactly does a manual (simple) thermostat work? It measures the temperature at its installation location, and when it drops below the set value, it closes a contact that switches on the heat source (boiler, pump, radiator) – once the set temperature is reached, the contact opens again. Unlike programmable thermostats, it has no weekly or daily schedule – the temperature is set manually using a rotary or sliding control.
• Where should the thermostat be placed? In a location that best represents the typical room temperature – away from direct sunlight, drafts, radiators, or other heat/cold sources that could distort the reading.
• Must installation be done by an electrician? Connecting the thermostat to the heating source's electrical circuit should be carried out by a person with electrical qualifications, since it involves work on the wiring and load switching.