SPX HPD Series - User Manual

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HPD Series

Heated Purge Desiccant Compressed Air Dryer

FORM NO.: 3156023 REVISION: 07/2014 READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT.

INSTRUCTION MANUAL

MODELS

RATED

FLOW

MODEL

REFERENCE

HPD300

HPD400

HPD500

HPD600

HPD750

300 SCFM

400 SCFM

500 SCFM

600 SCFM

750 SCFM

300

400

500

600

750

HPD900

HPD1050

HPD1300

HPD1500

HPD1800

900 SCFM

1050 SCFM

1300 SCFM

1500 SCFM

1800 SCFM

900

1050

1300

1500

1800

HPD2200

HPD2600

HPD3200

2200 SCFM

2600 SCFM

3200 SCFM

2200

2600

3200

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Questions and Answers

N
Nathan StephensNov 24, 2025
What causes Low Pressure Alarm on SPX HPD during drying?
- M
  Melissa MorganNov 24, 2025
  A Low Pressure Alarm during drying in your SPX Dehumidifier may occur due to: * **Loss of dryer air supply:** Check the compressor that supplies the dryer. * **Excessive air demand:** Inspect the equipment downstream of the dryer. * **Faulty drying tower pressure switch:** Check the pressure switch operation using the tower pressure gauge for comparison, and replace the switch if it's defective. * **Drying tower Inlet Valve failure:** Check for loss of pilot air. Make sure the manual drain valve on the bottom of the pilot air filter is fully closed, the pilot air filter cartridge isn't clogged, and the pilot air shut-off valve is open. * **Drying tower Purge Exhaust Valve failure:** Check for airflow out of the drying tower Purge Valve or exhaust piping, indicating the valve isn...
S
Samantha ColemanNov 26, 2025
What does High Pressure Alarm on SPX HPD regenerating tower mean?
- C
  Christian ThompsonNov 27, 2025
  A High Pressure Alarm on the regenerating tower of your SPX Dehumidifier can be caused by: * **Faulty regenerating tower pressure switch:** Check the pressure switch operation using the tower pressure gauge for comparison. Replace the switch if defective. * **Clogged regenerating tower Depressurization Muffler:** Examine the inner core and clean or replace it as necessary. * **Regenerating tower Depressurization Valve failure:** Check the valve operation. Repair or replace if possible. * **Obstructed regenerating tower purge exhaust piping:** Ensure the piping is free of obstructions. * **Regenerating tower Purge Exhaust Valve failure:** Check for loss of pilot air. Ensure the manual drain valve on the bottom of the pilot air filter is fully closed, the pilot air filter cartridg...