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ZEKS Eclipse 90ZPA - User Manual

ZEKS Eclipse 90ZPA
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TECHNICAL MANUAL
ZEKS Compressed Air Solutions
1302 Goshen Parkway
West Chester, PA 19380
Phone: 610-692-9100
800-888-2323
Fax: 610-692-9192
Web: www.zeks.com
Form: ZEKS ZPA NEMA 1 V0813
ZPA Heatless Purge
Desiccant Compressed Air Dryer
90-5000 scfm
NOTICE
Those operating the machine or performing
maintenance should read and understand
the decals positioned on the machine and
the contents of this Technical Manual.
Ensure that this Technical Manual is not
removed permanently from the machine.

Table of Contents

Questions and Answers

  • J
    John BarreraAug 14, 2025
    Why does my ZEKS Eclipse 90ZPA have an elevated dew point?
    • C
      Crystal BensonAug 14, 2025
      An elevated dew point in your ZEKS Dryer can stem from several causes. It may be due to an insufficient purge rate, so check the purge flow settings and piping for obstructions, cleaning the piping and muffler if needed. Also, inlet air pressure below the design condition, a flow rate higher than the design condition, or an inlet temperature exceeding 120F can contribute to this issue. Check the pressure source and system for leaks, verify the flow rate, and inspect/service the aftercooler. Finally, entrained water entering the desiccant bed or desiccant contaminated by oil could be the reason. In this case, check the air/moisture separator, prefilter, and drains, replacing the dryer desiccant if necessary. Consider installing a suitable prefilter.
  • P
    patrickjamesAug 17, 2025
    What to do if there is excessive pressure drop in my ZEKS Eclipse 90ZPA?
    • P
      Paul RogersAug 18, 2025
      If you're experiencing an excessive pressure drop in your ZEKS Dryer, it could be due to an excessive flow rate. Check the flow rate and determine the cause for the increased air demand. Alternatively, the inlet pressure may be below the design condition, so you should check the pressure source.
  • A
    Anthony NguyenAug 21, 2025
    How to fix a ZEKS Dryer that fails to shift?
    • J
      Justin MarquezAug 21, 2025
      If your ZEKS Dryer isn't shifting, begin by checking the power input to ensure there's no issue with the power supply. Then, inspect the solenoid valve for any defects. Also, verify that there is pilot air by checking the pilot air line and ensuring the control air line filter is clean. Lastly, inspect the pilot-operated diaphragm valve seat for failure, replacing seals as needed.
  • T
    Tiffany GuzmanAug 25, 2025
    What does it mean if the Blue Moisture Indicator (BMI) on my ZEKS Dryer indicates a high moisture level?
    • M
      Mr. Cristian Harvey IIIAug 25, 2025
      If the Blue Moisture Indicator (BMI) on your ZEKS Dryer indicates a high moisture level, it could be due to an elevated dew point. Refer to the corrective actions for 'Elevated Dew Point'. Also, if the BMI is wet, depending on the desiccant saturation, it could take a week or more of continuous use for it to switch back to its blue (dry) state.
  • A
    Alice RasmussenAug 27, 2025
    What to do if my ZEKS Eclipse 90ZPA fails to pressurize?
    • M
      Molly LeeAug 27, 2025
      If your ZEKS Dryer fails to pressurize, it may be due to a faulty purge valve. Check that the repressurization circuit is sending a control signal and inspect the purge valve and its solenoid valve.
  • E
    Eric Johnson DVMAug 31, 2025
    Why does my ZEKS Dryer fail to purge?
    • P
      Paul PaceAug 31, 2025
      If your ZEKS Dryer fails to purge, it could be because the purge valve does not open or is stuck in the closed position. Check the purge valve and its solenoid valve, repairing or replacing them if necessary. Also, verify that the repressurization circuit is sending a control signal.
  • M
    Michael HarrisSep 3, 2025
    Why is my ZEKS Eclipse 90ZPA depressurizing too rapidly?
    • Z
      znielsenSep 3, 2025
      If your ZEKS Dryer is depressurizing too rapidly, it could be that the purge valve doesn't close, and the dryer is repressurizing through the inlet valve. Check the purge valve and its solenoid valve.
  • C
    christophercoleSep 6, 2025
    How to resolve excessive back pressure in the regenerating tower (above 5 psig) of my ZEKS Eclipse 90ZPA Dryer?
    • E
      elizabeth53Sep 7, 2025
      Excessive back pressure in the regenerating tower (above 5 psig) of your ZEKS Dryer can occur if the purge muffler does not pass air, indicating it is dirty and needs replacement. Alternatively, it could be that the purge muffler passes too much air because air is leaking across the valve. In this case, check the inlet valve and outlet check valves, and verify that the inlet valve is closed to the purging tower (0 psig tower).
  • J
    Justin MarshallSep 10, 2025
    What causes excessively high pressure at the purge gauge on the right tower of my ZEKS Dryer?
    • A
      Alexander OliverSep 10, 2025
      An excessively high pressure reading at the purge gauge on the right tower of your ZEKS Dryer may be due to improper calibration. Reset the gauge when the right tower is online.

Summary

1.0 INTRODUCTION

2.0 ABBREVIATED WARRANTY

3.0 NOMENCLATURE

4.0 RECEIVING AND INSPECTION

4.1 INSPECTION

Inspect the unit closely for any signs of rough handling upon delivery.

4.2 UNPACKING AND HANDLING

Use proper lifting equipment to handle units safely, avoiding injury.

5.0 SAFETY AND OPERATION PRECAUTIONS

General Safety and Operation Precautions

Key safety rules and warnings for operating and maintaining the dryer.

6.0 PRINCIPLES OF OPERATION

Introduction and Cycles Overview

Overview of dryer operation, drying, and regeneration cycles.

6.4 Setting Regeneration Air Flow

Guide to manually setting purge air flow for optimal dryer performance.

Tower Repressurization and Valves

Process of repressurizing towers and description of dryer valves.

Timing Cycles for Dew Points

Details timing cycles for -40°F, -80°F, and -100°F dryer operations.

7.0 ALARMS AND INDICATORS

7.1 MOISTURE INDICATOR

Explains the Blue Moisture Indicator (BMI) for dew point status.

Alarm Overview

Details Failure-to-Shift, High Humidity, and Moisture Load Control alarms.

8.0 INSTALLATION AND START-UP

Application and Installation Checks

Verify design and installation requirements for optimal dryer performance.

Locating, Mounting, and Piping

Guidelines for placement, securing, and connecting air lines to the dryer.

Filtration and Electrical Connection

Importance of filtration and procedures for electrical connections.

8.6 DESICCANT LEVEL VERIFICATION

8.7 START-UP

9.0 MAINTENANCE AND SYSTEM CHECK

9.1 Scheduled Maintenance

Routine maintenance tasks including daily, semi-annual, and annual checks.

9.2 Prefilters and Afterfilters Maintenance

Procedures for maintaining prefilters and afterfilters to ensure performance.

9.3 Pilot Air Control Solenoid Valves

Maintenance and replacement recommendations for pilot air valves.

9.4 MUFFLER CHANGEOUT PROCEDURE

9.5 PURGE AND SWITCHING DIAPHRAGM VALVES

9.6 OUTLET CHECK VALVES

9.7 DESICCANT CHANGEOUT PROCEDURE

10.0 TROUBLESHOOTING

11.0 PURGE CHARTS

12.0 GENERAL ARRANGEMENT

13.0 WIRING DIAGRAM

14.0 FLOW DIAGRAM

15.0 FILTER FLOW

16.0 FILTER ARRANGEMENT

17.0 REPLACEMENT PARTS DIAGRAM

18.0 REPLACEMENT PARTS LIST

ZEKS Eclipse 90ZPA Specifications

General IconGeneral
Frequency60 Hz
ModelZEKS Eclipse 90ZPA
Airflow Capacity90 CFM
Operating Pressure100 psig
Pressure Dew Point-40°F (-40°C)
Phase1

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