LDH SERIES and D SERIES Duct Heaters
Watlow® duct heaters are constructed of sturdy 0.430 in. (11 mm) diameter WATROD™ heating elements mounted to a 1⁄4 in. (6 mm) thick steel flange. These air duct heaters are easily adapted to many non-pressurized air-heating systems.
Duct heaters are easily installed in applications requiring a wide range of temperature versus air flow combinations.
The modular duct heater offers increased reliability. The individual modules are removable through the housing of the assembly, which eliminates the need to pull the complete heater from the ductwork. This reduces downtime costs because the heating elements can be replaced individually. Performance improvements include quicker response time and reduced infiltration from the air stream being heated into the electrical enclosure.
Watlow air duct heaters offer advantages over gas or oil fired and open coil electric units with:
- Installation flexibility—no flues or fuel lines
- 100 percent energy efficient—no energy loss up the flue
- Universal availability of electricity
- Resistance coil in sheath is protected from corrosive environments
Duct heaters with general purpose enclosures meet UL® and CSA component recognition to 480 and 600VAC maximum respectively—UL® and CSA file numbers are E52951 and 31388.
|Material||Maximum Operating Temperatures||Maximum Watt Densities|
- Watt densities to 40 W/in² (6.2 W/cm²)
- Recommended process temperatures from -20 to 1200°F (-7 to 650°C)
- Wattages up to 225kW
- Voltages up to 600VAC
- Drying ovens
- Load banks
- Heat treating
- Paint drying
Features & Benefits:
|Long life Alloy 800 sheath|
|MgO insulation filled elements compacted to rock hard density|
|Field replaceable heating elements|
|3 1⁄2 in. (90 mm) thick mineral insulation|
|General purpose terminal enclosure|
|Rigid stainless steel supports|
|1⁄4 in. (6 mm) thick steel flange with 3⁄8 in. (9.5 mm) diameter mounting holes|
|WATROD hairpins are repressed (recompacted) after bending to assure MgO density|
|Silicone resin seals|