The warm air thermostat is a device combination consisting of three individual devices in a housing with protection class IP40 and the functions of a temperature controller, temperature monitor and a fixed safety temperature limiter. The switch head is attached with two screws through the lower part of the housing. With the help of a screwdriver, the desired switch-off temperature of the temperature controller and temperature monitor can be individually set on a scale inside after removing the housing cover. The temperature controller and temperature monitor are characterized by a high switching point accuracy of +/-4 K in the upper third of the scale. The safety temperature limiter has a switching point accuracy of +0/-5 K and is fixed at the factory. A decisive advantage is that no additional auxiliary power is required for temperature measurement. The electrical connection is made to a terminal block that is mounted on a circuit board. The device can directly switch a maximum permissible switching capacity of AC 230 Volt / 10 A. The temperature controller has a switching difference (hysteresis) of approx. 14 K, the switching difference of the temperature monitor is approx. 6 K. After the set target value is reached, the microswitches of the two devices switch over and after the switch-off temperature is undershot by the value of the switching difference, they automatically return to the original state. When the set temperature is reached, the safety temperature limiter opens the switching path and locks. The switch can only be manually unlocked again once the temperature has cooled down by approx. 10 K. The thermostat's three long-distance lines are made of copper. The three measuring sensors are also made of copper and each have a diameter of 4 mm. The housing cover is made of polycarbonate, the housing base is made of painted sheet steel. Warm air thermostats are particularly suitable for use in warm air systems according to DIN 4794, for example in large rooms, halls
| Property | Value |
| Opener: | 1 |
| Changeover: | 2 |
| Connection: | Screw connection |
| Sensor design: | Capillary tube |
| Adjustable switch-off temperature: | 80 °C |
| Adjustable switch-on temperature: | 20 °C |
| Electronic Design: | no |
| Explosion-proof: | no |
| Suitable as a limiter: | yes |
| Suitable as a monitor: | yes |
| Suitable as a 2-point controller: | no |
| Device design: | Mounted device |
| Max. Operating temperature: | 200 °C |
| Temperature switching difference: | 14 °C |
| Protection class (IP): | IP40 |
| Protection class (NEMA): | other |
