A-102-1 Electric Duct Heater Brochure - Brasch

Open coil iron-free heating elements. Highest grade (80%nickel, 20% chromium) Type A resistance wire has longer life;coils do not sag or oxidize; resistance does not change withtime; glowing is minimized with sufficient airflow. Elementsare spread across the face of the heater, when practical, toavoid stratification.Optional finned tubular heating elements.80/20 nickel/chromium innercoil centered in copper-plated steeltubes; magnesium oxide filler assuresrapid heat transfer from coil to steelfins brazed to tube; silicone rubberdouble seals prevent magnesium oxidecontamination. High temperature aluminumcoating protects element surfacesfrom corrosion.Secondary disc-type cutouts standard on every heater. Set athigher temperature than automatic reset thermal cutout. MeetsUL and NEC requirements. Sufficient number of cutouts locatedin the power lines de-energize elements should automatic resetthermal cutout fail; easily serviced through the terminal box. Noback-up contactors are required.Support brackets with special reinforcements(ribbing along edges and gussetsin top and bottom mounting flanges)BULLETIN A102-1Coil terminations have been designedto assure trouble-free connections.Ceramic bushings and stainless steelterminals guard against high temperatures.Coil connection is machinecrimped and nuts are tightened tospecified torque.7