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Typical wiring diagrams illustrated on these pages are typical wiring diagrams for heatrex open coil and finned tubular duct heaters wiring diagrams shipped with many heaters are semi typical in nature showing various alternates for certain compo nents and illustrating special features which may not be supplied on the heater in question. Collection of indeeco duct heater wiring diagram a wiring diagram is a streamlined traditional pictorial representation of an electric circuit it shows the components of the circuit as simplified shapes and also the power and signal links between the devices. Of open coil and finned tubular duct heaters within minutes with this software your local indeeco representative becomes the source for certified prints wiring diagrams complete submittal information our heaters and controls range from the simplest standard duct heater to the most sophisticated custom designed comprehensive system. Such as a heat pump nailor electric duct heaters are designed with electrical resistance elements arranged in the most advantageous pattern for heat transfer to the air stream nailor duct heaters provide constant heat as long as the heater is energized and the air velocity over the elements is constant the wire surface temperature may vary from. The controls are enclosed in a nema 1 control panel and a detailed wiring diagram is affixed to the control panel door for easy reference during installation and service thermolec electric duct heaters are built with components that have been selected according to a very demanding set of criteria to guarantee a reliable and durable operation