LDH Series and D Series duct heaters from Watlow are 100 percent energy efficient and are designed with Incoloy® sheath protected resistance coils. The LDH Series and D Series duct heaters can also be easily installed in applications requiring a wide range of temperatures. Constructed of 0.430 in. (11 mm) diameter Watrod™ heating elements mounted to a ¼ in. (6 mm) thick steel flange, the LDH Series and D Series duct heaters are easily adapted to many non-pressurized, air-heating systems such as HVAC.
Long life Incoloy® sheath resists corrosion/oxidation while protecting resistance coils against contamination.
MgO insulation-filled elements compacted to rock hard density to maximize dielectric strength, heat transfer and life. Ceramic fiber insulation also available.
Field replaceable heating elements permit easy service and reduce downtime. Element change-out is made simple by a single screw clamp (D Series only).
3½” thick mineral insulation keeps wiring cooler and reduces heat loss.
Silicone resin seals rated to 221°F (105°C) to protect elements against moisture and other contaminants.
General purpose terminal enclosure offers easy access to wiring – 1⁄4″ inside diameter thermowell.
Accepts an optional Type J or K thermocouple for accurate sheath temperature sensing (D Series only).
Rigid stainless steel supports prevent element sagging or deformation in various mounting positions.
1⁄4″ thick steel flange with 3⁄8″ diameter mounting holes – easily bolts to the duct wall.
Watrod hairpins are repressed (recompacted) after bending to assure MgO density.
Eliminates hot spots and electrical insulation voids.
Stock heaters feature from 3 to 60 elements.
Watt densities up to 40 W/in2, wattages up to 2.2 mW.
Recommended process temperatures from -20 to 1200°F.
One or three phase voltages, up to 600 VAC.
Meets local power supplies – maximum 48 amperes per circuit.
Complies with National Electrical Code (NEC).
60+ element designs available.
- Drying ovens
- Load banks
- Heat treating
- Paint drying
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