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Gardner Denver RNC125 - User Manual

Gardner Denver RNC125
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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

  • L
    Linda RussellAug 19, 2025
    Why is the pressure drop so high across my Gardner Denver RNC125 Dehumidifier?
    • D
      Dennis AllenAug 19, 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).
  • M
    Mary KnappAug 22, 2025
    How to troubleshoot a Gardner Denver Dehumidifier refrigeration system that is not functioning properly?
    • M
      Michael MillsAug 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.
  • J
    josephwallAug 28, 2025
    What causes a high pressure drop across my Gardner Denver Dehumidifier?
    • D
      Dawn CookAug 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).
  • J
    Justin LeeAug 30, 2025
    What to do if the refrigeration system is not functioning properly in my Gardner Denver RNC125?
    • G
      Glenn JohnsonAug 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
    April GrimesSep 3, 2025
    Why is the dew point indicator in the red area on my Gardner Denver RNC125?
    • L
      lauramcdonaldSep 3, 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
    ashley81Sep 12, 2025
    Why is there a high pressure drop across my Gardner Denver RNC125 Dehumidifier?
    • R
      Ryan VangSep 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
    sbaileyNov 15, 2025
    What to do if there is water downstream of my Gardner Denver Dehumidifier?
    • K
      Kim HarmonNov 15, 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...
  • A
    Amanda ChavezNov 24, 2025
    Why is there water downstream of my Gardner Denver RNC125?
    • J
      Julie KingNov 24, 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

Installation Procedures

Location Selection

Details on selecting the proper placement for the dryer unit.

Mounting the Dryer

Instructions for securely mounting the dryer on a level surface.

Piping Connections

Guidance on connecting air and water piping to the dryer.

Electrical Connections

Instructions for safely connecting the dryer's electrical supply.

Moisture Separator

Information on the moisture separator and its drain functions.

Dryer Operation

Operating Conditions

Specifies the environmental and pressure limits for dryer operation.

Start-up Procedure

Step-by-step guide for safely starting the dryer unit.

Timer Drain Function

Details on the timer drain function and its settings.

Timer Drain Programming

How to adjust the timer drain settings for optimal condensate removal.

Operating Check Points

Key operational checks to ensure the dryer is functioning correctly.

I-Controller Level 4 Operation

Instructions for operating models with the I-Controller Level 4.

RS-485 Port Connector

Guide to connecting and configuring the RS-485 communication port.

USB Host Feature

Instructions for using the USB port for data logging and updates.

Ethernet Feature

Details on connecting and using the Ethernet port for monitoring.

Electronic Demand Drain

Operation and maintenance of the electronic demand drain system.

Maintenance Procedures

Condenser Coil Cleaning

Procedure for cleaning the condenser coil for optimal performance.

Separator;Filter Replacement

Guide for replacing the separator and oil removal filter elements.

Troubleshooting Guide (I-Controller Level 1 & 2)

Water Downstream of Dryer

Troubleshooting steps for moisture in downstream air lines.

High Pressure Drop Across Dryer

Diagnosing and resolving high pressure drop issues.

Dew Point Indicator in Red Area

Addressing issues when the dew point indicator is in the red zone.

Refrigeration System Issues

Steps to troubleshoot a non-functioning refrigeration system.

Troubleshooting Guide (I-Controller Level 4)

Water Downstream of Dryer (Level 4)

Troubleshooting moisture issues for I-Controller Level 4 models.

High Pressure Drop (Level 4)

Diagnosing pressure drop for I-Controller Level 4 units.

Checkpoint Faults (Level 4)

Resolving various checkpoint faults on I-Controller Level 4.

Reference Information

Sizing Guide

Guide for determining the correct dryer model based on air flow and conditions.

Controller Screen Information

Status Menu Screens

Visual guide to the dryer's status menu screens.

Setup Menu Screens

Overview of the dryer's setup menu options and navigation.

Network Menu Screens

Screens for configuring network settings like IP address and Modbus.

Dimensions and Weights

Wiring Diagrams

I-Controller Level 1 Model 100

Wiring diagram for the I-Controller Level 1, Model 100.

I-Controller Level 2 Models 100-150

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

I-Controller Level 2 Models 200-600

Wiring diagram for I-Controller Level 2, Models 200-600.

I-Controller Level 4 Models 200-600

Wiring diagram for I-Controller Level 4, Models 200-600.

I-Controller Level 4 Model 750

Wiring diagram for I-Controller Level 4, Model 750.

Transformer Pack Wiring

Wiring diagram for the 575-460V transformer pack.

Replacement Parts

Cabinet Parts (RNC100-RNC150)

Part numbers for cabinet panels for RNC100-RNC150 models.

Parts (RNC200-RNC750 Air-Cooled)

Part numbers for RNC200-RNC750 air-cooled unit components.

Parts (RNC200-RNC750 Water-Cooled)

Diagrams and part numbers for RNC200-RNC750 water-cooled units.

Warranty Information

Gardner Denver RNC125 Specifications

General IconGeneral
ModelRNC125
CategoryDehumidifier
CFM300
Airflow Capacity300 CFM
Capacity125 Pints/Day
Power Supply115V

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