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

Table of Contents

Questions and Answers:

M
Michael McdanielAug 20, 2025
Why is my SPX HPD showing a High Humidity Alarm?
- R
  rhowardAug 20, 2025
  A high humidity alarm on your SPX Dehumidifier can be triggered by several factors: * **Desiccant bed overload:** Check the inlet air flow rate, temperature, and pressure. If the flow and temperature are higher than designed, or the pressure is lower, the dryer may be overloaded. * **Poor regeneration:** Ensure proper purge flow and verify the heater's operation and current draw. * **Moisture probe issues:** Inspect the sensor for damage and check its operation. Replace the sensor or control board if needed. * **Loss of desiccant capacity:** Examine filter elements and drains for contamination due to improperly filtered inlet air. Repair or replace components as necessary.
A
Anthony ReyesAug 22, 2025
How to fix Heater Over-Temperature Alarm on SPX HPD?
- A
  Amanda AllisonAug 23, 2025
  If your SPX Dehumidifier shows a Heater Over-Temperature Alarm, it could be due to: * **Insufficient purge gas flow:** Check for proper purge flow and reset as required. * **Temperature sensor failure:** Repair or replace the sensor as needed.
L
Lauren WallsAug 30, 2025
Why does my SPX Dehumidifier show a Heater Low-Temperature Alarm?
- J
  Joe YoungAug 30, 2025
  A Heater Low-Temperature Alarm on your SPX Dehumidifier can be triggered by: * **Heating malfunction:** This could be due to heater failure or heater contactor failure. Replace the heater or heater contactor. * **Temperature sensor failure:** Repair and replace the sensor as required.
L
Linda KnappSep 1, 2025
How to troubleshoot Low Pressure Alarm on SPX HPD Dehumidifier during regeneration?
- L
  Laura WellsSep 2, 2025
  If you're experiencing a Low Pressure Alarm during regeneration on your SPX Dehumidifier, check the following: * **Faulty left tower pressure switch:** Check the pressure switch operation using the tower pressure gauge for comparison. Replace the switch if defective. * **Regenerating tower Purge Exhaust Valve failure:** Check for air flow out of the regenerating tower Purge Valve or exhaust piping indicating the valve isn't completely closed. * **Regenerating tower Depressurization Valve failure:** Check for air flow out of the regenerating tower Depressurization Muffler indicating the valve isn't completely closed.
W
William AllenSep 4, 2025
Why SPX Dehumidifier has excessive pressure drop?
- E
  Evelyn AllenSep 4, 2025
  Excessive pressure drop in your SPX Dehumidifier may be due to: * **Dirty inlet/outlet screens:** Clean the screens on the desiccant towers, following desiccant removal instructions in the Maintenance section. * **Excessive flow rate:** Check the flow rate of inlet air and reduce it to the designed flow rate.
D
deborahhaasSep 6, 2025
How to fix SPX HPD Dehumidifier when indicator lights are off?
- W
  William MasonSep 6, 2025
  If the indicator lights on your SPX Dehumidifier are not illuminated: * **No power to the unit:** Check the voltage at the terminal board. * **Loss of power supply:** Check the disconnect switch or breaker. If a tripped breaker or blown fuse is found, investigate and remedy the cause. * **Blown fuse:** Replace the fuse. * **Board malfunction:** Replace the board.
J
Joshua SweeneySep 9, 2025
What does Temperature Under/Over-Range Alarm on SPX HPD Dehumidifier mean?
- K
  Karen KingSep 9, 2025
  A Temperature Under-Range or Over-Range Alarm on your SPX Dehumidifier indicates: * **Tower temperature sensor failure:** For Under-Range, check for a short circuit on the sensor. For Over-Range, check for an open circuit on the sensor. Check the temperature circuit for continuity and repair or replace as necessary.
A
andrea44Sep 12, 2025
What to do if SPX Dehumidifier displays Dew Point Under/Over-Range Alarm during regeneration?
- A
  Ashley CraigSep 12, 2025
  If your SPX Dehumidifier is showing a Dew Point Under-Range or Over-Range Alarm during regeneration, it could be due to: * **Energy Management temperature sensor failure:** Check the temperature circuit for continuity. Repair or replace as necessary.
K
Kathy SmithSep 14, 2025
What causes Energy Management Under/Over-Range Alarm on SPX Dehumidifier?
- R
  Ronald WilliamsSep 14, 2025
  An Energy Management Under-Range or Over-Range Alarm on your SPX Dehumidifier suggests: * **Energy Management sensor failure:** Check the circuit for continuity. Repair or replace as necessary.

SPX HPD Series Specifications

General

Brand	SPX
Model	HPD Series
Category	Dehumidifier
Language	English

Summary

General Safety Information

Safety Rules and Warnings

Critical safety guidelines for dryer operation.

Hazard Severity Levels

Defines DANGER, WARNING, and CAUTION signal words.

Receiving, Storing, and Moving

Installation Requirements

System Arrangement and Filtration

Proper dryer placement and required filtration.

Piping and Connection Guidelines

Details for external air and purge piping.

Electrical Connection Procedures

Steps for safely connecting power to the dryer.

Initial Desiccant Charge Procedure

Step-by-step guide for loading desiccant into towers.

Instrumentation and Controls

Energy Management System Function

How the EMS optimizes dryer operation.

Dryer Operation

Operating Modes Explained

Overview of available dryer operating modes.

Operating Sequence Description

Detailed description of the drying/regeneration cycle.

Fixed Cycle Operation Sequence

Step-by-step process for fixed cycle operation.

Demand Cycle Operation Sequence

Control Board Jumper Settings

Program Mode Configuration

Alarm and Service Mode

How to access and interpret alarms and service reminders.

Alarms for Optional Devices

Energy Management Alarms

Dew Point Sensor Alarms

Test Mode Operation

Procedure for running diagnostic tests on the dryer.

Start-Up Procedures

Steps to safely bring the dryer online after installation.

Operational Check Points

Dryer Shut Down Procedure

Steps for safely taking the dryer offline.

Power Loss and Recovery Behavior

Maintenance Procedures

Desiccant Replacement

Detailed steps for replacing the desiccant material.

Troubleshooting Guide

Indicator Lights Not Illuminated

Excessive Pressure Drop

Low Pressure Alarm (Drying)

Troubleshooting a low pressure alarm during drying.

High Pressure Alarm (Regenerating)

Troubleshooting a high pressure alarm during regeneration.

Low Pressure Alarm (Regenerating)

Troubleshooting a low pressure alarm during regeneration.

Temperature Under/Over-Range Alarm

Dew Point Under/Over-Range Alarm

Diagnosing dew point sensor range alarms.

Outlet Dew Point Alarm

Troubleshooting high outlet dew point conditions.

High Humidity Alarm

Heater Over-Temperature Alarm

Energy Management Sensor Alarms

Diagnosing alarms related to EM sensors.

P&ID Schematic - Models 300-600

Electrical Schematic - 460VAC, 3 Phase

Electrical Schematic - 575VAC, 3 Phase

Warranty Information

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