Electronic Step Controller
An Electronic Step Controller provides smooth sequencing of a duct heater up to 12 steps. When interruption of power occurs all the stages will recycle to OFF. When power is restored, the switches will re-energize in a stepped sequence.
Commonly used with a 2–10 VDC from a stand-alone T-stat, 2-10 VDC from a DDC building automation system and 4-20 mA from a building automation system; check with the factory for availability. Not available on DHB & DB series or bottom mount heaters.