Click to expand Tap to zoom Viessmann Room temperature sensor 7438537 by VIESSMANN SKU 7438537 Room Temperature Sensor. Room temperature sensor NTC 10 kOhm, to supplement other controls. Must be paired with: Fits Vitoron dens 200-T Vitodens 100-W Vitodens 100-W System Vitodens 111-WVitodens 200-W Light Commercial Vitodens 222-F Vitotrol 200 Vitotrol 200-E Vitotrol 300-ADownload - Installation Accessories