Gardner Denver RNC750 User Manual

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REFRIGERATED

TYPE

COMPRESSED

AIR DRYERS

INSTRUCTION MANUAL

RNC Series

Models: RNC100, RNC125, RNC150, RNC200,

RNC250, RNC300, RNC400, RNC500,

RNC600, RNC750

5002737 Rev. J 02/17

18-2-670 RNC100-750 New Platform 1st Edition

For Sales and Service: (800) 883-2477

Or visit Sales and Service at www.gardnerdenverproducts.com

Table of Contents

Questions and Answers:

J
Joseph WilliamsAug 18, 2025
Why is the pressure drop so high across my Gardner Denver RNC750 Dehumidifier?
- M
  martinezcaitlinAug 18, 2025
  A high-pressure drop across your Gardner Denver Dehumidifier can stem from a few reasons. First, check the flow rate to ensure it's not excessive. Freezing of moisture in the evaporator due to a refrigeration system fault can also cause this issue. Lastly, a clogged separator or optional Oil Removal filter element could be the culprit; if so, replace the filter element(s).
A
amy30Aug 21, 2025
How to troubleshoot a Gardner Denver RNC750 refrigeration system that is not functioning properly?
- U
  umilesAug 21, 2025
  If the refrigeration system of your Gardner Denver Dehumidifier isn't working right, begin by checking the power to the unit. Ensure the ON/OFF switch is in the “ON” position and that the line disconnect switch is closed. Inspect fuses and breakers for continuity. Have an electrician examine the wiring for any faults or loose terminals. Also, check if ambient conditions are within the specified minimum and maximum temperature ranges. For air-cooled models, ensure the condenser fins are clean and that there is free airflow across the condenser. If the problem continues, further assistance is required.
T
taylorkennethAug 27, 2025
What causes a high pressure drop across my Gardner Denver Dehumidifier?
- C
  craig02Aug 27, 2025
  A high pressure drop across your Gardner Denver Dehumidifier could stem from a few reasons. First, check the flow rate to ensure there isn't excessive air flow. Another potential cause is the freezing of moisture in the evaporator due to a refrigeration system fault. Lastly, the separator or optional oil removal filter element might be clogged, necessitating replacement of the filter element(s).
M
Mr. Robert James DDSAug 30, 2025
What to do if the refrigeration system is not functioning properly in my Gardner Denver Dehumidifier?
- C
  Courtney PhillipsAug 30, 2025
  If the refrigeration system of your Gardner Denver Dehumidifier isn't working correctly, begin by checking the power supply to the unit. If the power light is off, ensure the unit is receiving power. If the compressor light is off, turn the switch to the “ON” position. If the refrigeration compressor cycles on and off, close the disconnect switch. Check for continuity and have an electrician inspect the electrical connections. Also, verify the minimum and maximum temperature ranges, and clean the condenser, ensuring free airflow. If the problem continues, further assistance is required.
C
Charles FisherSep 2, 2025
Why is the dew point indicator in the red area on my Gardner Denver RNC750?
- E
  edwardsvictoriaSep 2, 2025
  If the dew point indicator on your Gardner Denver Dehumidifier is in the red area, it could be due to the dryer being overloaded, resulting in a high air outlet temperature. It may also be because the refrigeration system is not functioning properly, also leading to a high air outlet temperature. If the dryer is running with no load, the light will go out when air flow is established.
A
Austin WilsonSep 12, 2025
Why is there a high pressure drop across my Gardner Denver Dehumidifier?
- K
  Keith CookSep 12, 2025
  A high pressure drop across your Gardner Denver Dehumidifier can be due to several reasons. First, check the flow rate to ensure there isn't excessive airflow. If moisture is freezing in the evaporator due to a refrigeration system fault, see section D (not provided). Lastly, the separator or optional Oil Removal filter element might be clogged; replace the filter element(s) in this case.

Gardner Denver RNC750 Specifications

General

Brand	Gardner Denver
Model	RNC750
Category	Dehumidifier
Language	English

Summary

General Safety, Installation, and Operation

Safety Precautions and Handling

Covers safety, receiving, moving, unpacking, and storage.

Installation Procedures

Covers location, mounting, piping, electrical, and separator connections.

Operation Guide

Details operating conditions, start-up, and controller functions.

Connectivity, Monitoring, and Maintenance

Communication Ports, Ethernet, and Modbus

Covers RS-485, USB, Ethernet features, and Modbus integration.

Routine Maintenance Tasks

Covers condenser, separator, filter, and drain servicing.

Troubleshooting and Reference Data

System Faults and Solutions

Guides on diagnosing and resolving common dryer issues and alarms.

Sizing, Engineering Data, and Specifications

Includes sizing, engineering tables, settings, alarms, and dimensions.

Wiring Diagrams and Replacement Parts

Electrical Schematics for All Models

Provides wiring diagrams for various controller levels and transformer packs.

Cabinet and Component Parts

Lists replacement parts for cabinets and components across models.

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