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PROCESS HEATER WIRING DIAGRAMS
TYPICAL WIRING DIAGRAMS WITHOUT THERMOSTATS
Process Heaters with Two Elements
L1 L2
Single-Phase - Series Connection
Element Voltage
Equals
One Half-Line Voltage
Process Heaters with Three Elements
L2
Single Phase
Single Phase
L2
L1
L1 L1
L1 Single-Phase - Parallel Connection
Element Voltage
190 Detroit Street • Cary, Illinois 60013 • Phone: 847-639-5600 • Fax: 847-639-2199 • Web: www.durexindustries.com • TOLL FREE: 800-762-3468
L2
L2
L2
Equals
Full Line Voltage
Note: Dual-Voltage heaters are factory wired for the highest
voltage (series connection) unless otherwise speci�ed.
Easily rewired for lower voltage operation (parallel connection).
L1
Three Phase Delta
Three Phase Delta
L3
L3
L1
Three Phase Wye
L1
Three Phase Wye
Standard process style heaters with three elements are factory wired for three-phase
delta. They can be rewired for single-phase operation with no wattage change. Wattage can be reduced
to one third of the designed wattage by switching from three-phase delta to Wye connection.
L2
L2
L3
L3
45