Uses an electric heater (and on blower-purge, an ambient air blower) to regenerate beads. Reduces purge loss dramatically vs heatless.
How it works
Heater raises regen air to 350–450°F to drive moisture off beads, then cooling phase before tower returns to service. Blower-purge uses ambient air rather than dry product air, cutting purge to ~2%.
Key specs
- PDP–40°F (–100°F option)
- Purge lossHeated ~7%, blower-purge ~2%
- Heater temp350–450°F regen
Preventive maintenance
- Quarterly: check heater amp draw and high-temp limit switch.
- Annual: inspect blower (blower-purge models), check valve seats.
- Verify cooling step is full duration — short cooling sends hot air downstream.
Troubleshooting
Hot air at outlet during switchover
Likely causes
- Cooling step too short or skipped
- Cooling valve failure
Fix
Verify cycle timer, replace cooling sequence valve.
Heater not heating
Likely causes
- Open heating element
- Tripped high-limit
- Failed contactor / SSR
Fix
Ohm element, reset high-limit only after root cause, replace contactor.