Description
Duct heater shall be standard, slip or flanged type. Size, KW, Control Voltage and Stages shall be shown on the drawing and schedule. Heating element shall be stainless steel finned tubular type, not open coil type.
Includes an 80/20 nickel chrome resistance wire, connected to terminal pins.
It shall be filled with high quality magnesium oxide compressed to ensure a rapid and even heat transfer. Heater frames and control box shall be corrosion-resistant steel coated. All heaters shall be furnished with disc type automatic reset thermal cutout for primary over temperature protection.
Heater shall also be furnished with disc type, load-carrying manual reset thermal cut out factory wired in series with heater stages for secondary protection. All three-phase heaters shall have equal, balanced, three phase stages. All internal wiring shall be standard copper for high temperature application (heat resistant silicon wires).
Heater shall be furnished either with standard control component like thermal cutouts, airflow switch, fuses (if more than 48 Amp.), control transformer or with options like:
A) Step Controller (Sequences) + Room thermostat
B) Thyristor solid state controller to modulate the entire heater load directly, (varying the heater output from 0 to 100% of total heater KW).
C) Backup magnetic contactor.
D) Disconnect switch.
E) Pilot light.
F) Toggle switch.
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