AEC HE Mass Flow Series Drying hoppers - Manual (Page 49)

Page 48 HE
• CHE • BCHE Mass Flow Series Drying Hoppers
7. Loosen the hose clamps securing the diffuser to the tube stub inside the drying hopper.
8. Re-install the air diffuser before operating the drying hopper.
7-3 Replacing the Process Heater
HE, CHE, and BCHE drying hoppers use Calrod-type heater elements mounted in a heater tube
located near the air inlet of the drying hopper. Heater wattage varies with model, voltage,
temperature range, etc., but the replacement procedure is the same. Check your customer spare
parts list that was included in your information packet.
! WARNING !
Disconnect and lock out power before you replace heater elements!
Procedures
1. Remove the bolts securing the process heater access cover. Typically the heater tube is
mounted in a vertical position with the heater access cover facing the floor.
2. Sketch the heater wiring configuration so you can properly re-wire the heater.
3. Remove the wires to the heater plate assembly you are removing or replacing.
4. Remove the bolts securing the heater plate assembly, and slide out the assembly.
5. Remove the heater from the mounting plate by removing the large brass nuts and
washers.
6. Re-install the heater and heater plate assemblies in reverse order. Install new heater
gaskets and securely tighten all fasteners.
Caution!
Heater loops should not touch each other.
“Hot spots” lead to premature heater failure!
7. Reinstall the wires based on the sketch you made earlier.
8. Secure the heater access cover.