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Large Dehumidifying Dryers Maintenance 47
High
Temperature
Gasket
Double Wall
Stainless Steel
Heater
Housing
Heater Elements
Heater Element
Mounting Plate
Stainless Steel
Heater Housing
Cover
High
Temperature
Gasket
Heater Assembly
Gude Bars
1. Remove the bolts securing the process heater access cover.
2. Sketch the heater wiring configuration so the heaters may be re-wired properly.
Heaters are mounted on a common plate of three or six for easy maintenance.
3. Remove the jumper bars and wires for the heater plate assembly(ies) being removed
or replaced.
4. Remove the bolts securing the heater plate assembly and slide out the assembly.
Avoid damaging the gaskets.
5. Remove individual heaters for replacement by removing the large brass nuts and
washers.
6. Re-install the heaters and heater plate assemblies in reverse order, replacing gaskets
if necessary.
Caution! Heater loops should not touch each other. "Hot spots" will lead to
premature heater failure.
7. Re-install the jumper wires and bars according to the sketch made earlier.
8. Re-secure the process heater access cover.
Figure 19: Process Heater Box Assembly
Replacing the Regeneration Heater (Electric Dryers)
The regeneration heaters are wired in the delta formation, mounted in the core of the descant
tanks.
DANGER! Disconnect and lock out power before heater replacement.
Heater Element
Heater Element
Bulkhead Fitting
Heater Element
Mounting Hex Nut
Hex Nut For
Securing the Heater
Wire
Washer
Heater Wire with
Crimped on Closed
Loop Connector
High Temperature
Washer / Gasket
Heater Mounting
Plate
Heater Assembly
Guide Bar
Heater Elements
Heater Element
Mounting Plate
High
Temperature
Gasket
Double Wall
Stainless Steel
Heater
Housing
Stainless Steel
Heater Housing
Cover
Heater Assembly
Gude Bars