A controller for fully automatic control of electric snow and ice protection systems, e.g. protection of descents, ramps, pedestrian draft against snow and ice, protection of gutters and downspouts against freezing, prevention of snow accumulation on roofs. The controller allows you to control two heating zones, i.e. with appropriate connection of two sensors to control the gutters or two sensors to control the descent and pedestrian draft to one controller. A multifunctional button, easy to use and backlit liquid crystal screen allow for easy and quick reading, setting the temperature and range in the regulator's operation.

Technical data

• supply voltage 120/230 V, 50-60 Hz
• built-in 24 VAC, 6 VA transformer
• three output relays (potential-free contact) 3 16 A
• one auxiliary relay (potential-free contact) 5 A
• hysteresis 0.3 K
• temperature regulation range from 0 C to +5 C
• weight 600 g
• height 90 mm
• width 156 mm
• depth 45 mm
• mounting on a DIN rail or surface
• tightness of the controller housing for surface mounting IP21
• calibration via the multifunction knob
• operating mode: (ON) humidity and temperature; (OFF) temperature

The package includes the ETO2-4550 controller, the ETOR-55 moisture sensor for gutters and the external air temperature sensor in a hermetic ETF-744/99 casing and a frame for surface mounting. Possibility to connect an additional moisture sensor to the ETOR-55 gutters or the integrated ETOG-56T soil moisture and temperature sensor.