Gardner Denver RNC500 - 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

M
maria83Aug 18, 2025
Why is the pressure drop so high across my Gardner Denver RNC500 Dehumidifier?
- K
  Kyle SanchezAug 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).
S
scottramirezAug 21, 2025
How to troubleshoot a Gardner Denver Dehumidifier refrigeration system that is not functioning properly?
- R
  Robert BrownAug 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.
S
Susan RossAug 27, 2025
What causes a high pressure drop across my Gardner Denver RNC500 Dehumidifier?
- M
  Mrs. Carol Curtis MDAug 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).
S
stewartdawnAug 30, 2025
What to do if the refrigeration system is not functioning properly in my Gardner Denver RNC500?
- D
  Dr. Johnathan HallAug 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.
M
Mark HubbardSep 2, 2025
Why is the dew point indicator in the red area on my Gardner Denver Dehumidifier?
- J
  Joshua TerrySep 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.
M
mooresusanSep 12, 2025
Why is there a high pressure drop across my Gardner Denver RNC500 Dehumidifier?
- D
  Dr. Christine Mcmahon DDSSep 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.
S
Sarah BaileyNov 14, 2025
What to do if there is water downstream of my Gardner Denver Dehumidifier?
- J
  Jessica MorrisNov 14, 2025
  If you find water downstream of your Gardner Denver Dehumidifier, several factors could be at play. Start by blowing out the system with dry air to eliminate any residual moisture in the pipelines. Ensure the air bypass system isn't open by checking the valve positions. Confirm that the inlet and outlet connections are correctly connected. If temperatures around the air lines downstream have dropped below the dryer's dew point rating, insulate or heat trace those lines. Check if the condensate drain is clogged or not working; if it's inoperative, replace it. Also, make sure the drain line isn't restricted or frozen—if it is, open it. For electric drains, reset the timer to fully discharge all liquid. If the dryer is overloaded, check the inlet air temperature, pressure, flow rate, and ambi...
G
gomezkatherineNov 23, 2025
Why is there water downstream of my Gardner Denver RNC500 Dehumidifier?
- K
  Kevin ArcherNov 23, 2025
  If you find water downstream of your Gardner Denver Dehumidifier, several issues could be the cause. It might be due to residual free moisture in the pipelines, which can be resolved by blowing out the system with dry air. The air bypass system might be open, so check the valve positions. Ensure the inlet and outlet connections are correctly connected. If temperatures around the air lines downstream have dropped below the dryer's dew point, insulate or heat trace those lines. Excessive free moisture at the dryer inlet requires installing a separator ahead of the dryer. Check the condensate drain: if it's not draining automatically, replace the drain mechanism; if clogged, open the drain line. For electric drains, reset the timer for sufficient condensate removal. An overloaded dryer, resul...

Summary

General Safety Information

Receiving, Moving, and Unpacking

Procedures for handling shipment, moving, and storage.

Operation

Operating Conditions and Start-up

Parameters for operation and initial startup procedures.

I-Controller Level 4 Settings

Language, Time, and Schedule Settings

Configuring language, date, time, and schedules.

Modbus Register Details

Register Reference Table

Maintenance

Condenser Coil Cleaning

Procedures for cleaning the condenser coil for optimal performance.

Separator;Filter Replacement

Steps for replacing separator and oil removal filter elements.

Troubleshooting Guide

I-Controller Level 1 & 2 Issues

Common symptoms and corrective actions for controller levels 1 and 2.

I-Controller Level 4 Issues

Troubleshooting for controller level 4, including alarms and faults.

Reference Data

Sizing and Capacity Correction

How to determine dryer capacity based on operating conditions.

Engineering Data Tables

Technical specifications and performance data for different models.

Wiring Diagrams

I-Controller Level 1 Wiring

I-Controller Level 2 Wiring

I-Controller Level 4 Wiring

Warranty

Summary

General Safety Information

Receiving, Moving, and Unpacking

Procedures for handling shipment, moving, and storage.

Operation

Operating Conditions and Start-up

Parameters for operation and initial startup procedures.

I-Controller Level 4 Settings

Language, Time, and Schedule Settings

Configuring language, date, time, and schedules.

Modbus Register Details

Register Reference Table

Maintenance

Condenser Coil Cleaning

Procedures for cleaning the condenser coil for optimal performance.

Separator;Filter Replacement

Steps for replacing separator and oil removal filter elements.

Troubleshooting Guide

I-Controller Level 1 & 2 Issues

Common symptoms and corrective actions for controller levels 1 and 2.

I-Controller Level 4 Issues

Troubleshooting for controller level 4, including alarms and faults.

Reference Data

Sizing and Capacity Correction

How to determine dryer capacity based on operating conditions.

Engineering Data Tables

Technical specifications and performance data for different models.

Wiring Diagrams

I-Controller Level 1 Wiring

I-Controller Level 2 Wiring

I-Controller Level 4 Wiring

Warranty

Gardner Denver RNC500 Specifications

General

Brand	Gardner Denver
Model	RNC500
Category	Dehumidifier
Language	English

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