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PARTS LIST:
1. Electrical Enclosure
2. Cast Heater Body
3. Connection Fittings
(optional)
4. Thermostat (optional)
5. Sheet Metal Insulation
Jacket (optional)
6. Foam Insulation Sleeve
(optional)
7. Thermocouple (optional)
8. Replaceable Heater
(DFX 250 Only)
250 NEMA 1
250 NEMA 4
NOTICE!
Read this entire document before installing, operating
or servicing this product. Failure to do so may cause
personal injury and/or equipment damage.
Read all WARNING! messages. They call out impor-
tant safety information to prevent personal injury and/
or equipment damage.
190 Detroit Street, Cary, Illinois 60013 • Phone: 847-639-5600 • Fax: 847-639-2199 • Web: www.durexindustries.com • TOLL FREE: 800-762-3468
DFX Cast Circulation Heater
Installation & Operation Manual
DFX 250
NEMA 4
Housing
Cartridge
Heater
Heater
Body
250 NEMA 7
750 NEMA 1
750 NEMA 4
BEFORE INSTALLATION
DFX 350, 375, 550 and 750 Series
Optional TC
Location
Note: Number of heater elements varies
depending on model number.
350/375/550 NEMA 1
350/375/550 NEMA 4
750 NEMA 7
1. Unpack the heater and ensure all parts are included. Consult
Durex Industries for instructions if parts appear to be missing
or if the product appears to be damaged. DO NOT OPERATE
DAMAGED EQUIPMENT.
2. Check nameplate information to ensure the product complies
with the required specifications. Contact Durex Industries
if there appears to be an error prior to proceeding with the
installation.
NEMA 1
Housing
Terminations
Heater Body
350/375/550 NEMA 7
1
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Table of Contents
Summary of Contents for Durex industries DFX 750 Series
- Page 1 1. Unpack the heater and ensure all parts are included. Consult NOTICE! Durex Industries for instructions if parts appear to be missing Read this entire document before installing, operating or if the product appears to be damaged. DO NOT OPERATE or servicing this product.
- Page 2 DFX Cast Circulation Heater Installation & Operation Manual INSTALLATION WARNING! Customer Fabricated EXPLOSION & FIRE HAZARD. Avoid installation of Support heater near combustible vapors or flammable gas-laden atmospheres as hot heater surfaces can possibly ignite Thread Size & Depth the flammable mixtures and cause personal injury and Thread Thread Hole...
- Page 3 DFX Cast Circulation Heater Installation & Operation Manual WIRING high operating temperatures, use minimum 250°C (480°F) rated WARNING! power feed wire. Apply appropriate ampacity de-rate factors ELECTRIC SHOCK HAZARD. Disconnect power prior to the wire based on expected enclosure operating temperature to making (or servicing) wire, cable and conduit con- conditions.
- Page 4 DFX Cast Circulation Heater Installation & Operation Manual WIRING DIAGRAMS 1 Phase 3 Phase 1 Phase Series 1 Phase Parallel 1 Phase 3 Phase, Delta 3 Phase, Wye DFX 550 and 750, 3 Elements DFX 250, Heater Element DFX 350 and 375, 2 Elements 3 Phase Delta Series 3 Phase Delta Parallel 3 Phase Wye Parallel...
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