Gardner Denver RNC400 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:

A
Amy BowersAug 18, 2025
Why is the pressure drop so high across my Gardner Denver RNC400 Dehumidifier?
- Y
  yangmatthewAug 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).
K
Kimberly PaceAug 22, 2025
How to troubleshoot a Gardner Denver RNC400 Dehumidifier refrigeration system that is not functioning properly?
- C
  Courtney HaasAug 22, 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.
G
ginacombsAug 27, 2025
What causes a high pressure drop across my Gardner Denver RNC400 Dehumidifier?
- C
  Curtis BentonAug 28, 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).
P
Peter Williams DDSAug 30, 2025
What to do if the refrigeration system is not functioning properly in my Gardner Denver Dehumidifier?
- E
  Edward CookAug 31, 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.
A
Andrew WiseSep 2, 2025
Why is the dew point indicator in the red area on my Gardner Denver RNC400?
- A
  Andrew SmithSep 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.
S
Stacy HartmanSep 12, 2025
Why is there a high pressure drop across my Gardner Denver RNC400?
- S
  Sharon ThompsonSep 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 RNC400 Specifications

General

Brand	Gardner Denver
Model	RNC400
Category	Dehumidifier
Language	English

Summary

General Safety Information

Pressurized Devices Safety

Safety precautions for pressure-containing equipment.

Electrical Safety Precautions

Safety guidelines for electrical operation and service.

Installation Guide

Location Requirements

Piping Connections

Details on connecting air inlet, air outlet, and water lines.

Electrical Connections

Guidance for making proper electrical connections to the dryer.

Moisture Separator Operation

Operation Procedures

Minimum/Maximum Operating Conditions

Start-up Sequence

Step-by-step instructions for safely starting the dryer.

Operating Check Points

I-Controller Level 4 Operation

Detailed instructions for operating the I-Controller Level 4.

Manual and Schedule Mode Operation

Operating the dryer in manual or scheduled modes.

Starting and Operating Checkpoints

Procedures for starting the dryer and performing operational checks.

USB Host Port Functionality

Ethernet Connectivity and Web Interface

Dryer Settings Configuration

Modbus TCP Communication

Modbus Register Reference

Table of Modbus registers for dryer data and control.

Modbus Register Details: Dryer Status & Flags

Modbus Register Details: Dryer Model & Mode

Electronic Demand Drain (EDD) Operation

Maintenance Procedures

Condenser Coil Cleaning

Moisture Separator/Oil Removal Filter Service

Separator Drain Checks and Rebuild

Troubleshooting Guide (I-Controller Level 1 & 2)

Water Downstream of Dryer Issues

High Pressure Drop Troubleshooting

Dew Point Indicator Issues

Refrigeration System Malfunctions

Diagnosing issues with the refrigeration system not functioning.

Troubleshooting Guide (I-Controller Level 4)

Level 4: Water Downstream Issues

Level 4: High Pressure Drop

Level 4: Checkpoint Faults

Diagnosing faults and alarm conditions for Level 4 controller.

Reference Information

Dryer Sizing Guide

Engineering Data: Models 100-250

Engineering Data: Models 300-750

Dryer Set Point Configuration

Dryer Alarm Conditions and Actions

List of alarm conditions, triggers, and corresponding actions.

Controller Screen Shots: Status Menu

Controller Screen Shots: Setup Menu

Controller Screen Shots: Network Menu

Wiring Diagrams

I-Controller Level 1

Electrical wiring diagram for I-Controller Level 1, Model 100.

I-Controller Level 2 (Model 100-150)

Electrical wiring diagram for I-Controller Level 2, Models 100-150.

I-Controller Level 2 (Models 200-600, Sheet 1)

Electrical wiring diagram for I-Controller Level 2, Models 200-600 (Sheet 1).

I-Controller Level 2 (Models 200-600, Sheet 2)

Electrical wiring diagram for I-Controller Level 2, Models 200-600 (Sheet 2).

I-Controller Level 4 (Model 750, Sheet 1)

Electrical wiring diagram for I-Controller Level 4, Model 750 (Sheet 1).

I-Controller Level 4 (Model 750, Sheet 2)

Electrical wiring diagram for I-Controller Level 4, Model 750 (Sheet 2).

I-Controller Level 4 (Models 200-600, Sheet 1)

Electrical wiring diagram for I-Controller Level 4, Models 200-600 (Sheet 1).

I-Controller Level 4 (Models 200-600, Sheet 2)

Electrical wiring diagram for I-Controller Level 4, Models 200-600 (Sheet 2).

Transformer Pack (Models 200-750)

Product Warranty Information

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