Sullair SD Series - User Manual

Questions and Answers

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Erica DixonAug 11, 2025
What to do if the dryer does not switch towers in Sullair SD?
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  Belinda SalinasAug 11, 2025
  If your Sullair Dehumidifier's dryer isn't switching towers, several factors could be at play. The inlet valve combination might not be opening or switching; in this case, check the electrical functioning of the solenoids and replace either the solenoid or the complete valve combination. Another reason could be that the PLC isn't functioning; check the PLC and the fuse in the control cabinet. The vessel might not be pressurized; check whether the blow-off valves are dirty and replace them if necessary, and check the electrical functioning of the solenoids, replacing either the solenoid or the complete valve combination. The regeneration orifice might be obstructed; clean or replace it.
C
Crystal NguyenAug 19, 2025
How to fix high back pressure during regeneration phase in Sullair SD?
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  Phillip WilliamsAug 20, 2025
  High back pressure during the regeneration phase in your Sullair Dehumidifier can stem from a few issues. The silencer might be blocked; clean or replace it. The inlet/exhaust valve cylinders could be defective; lubricate the cylinder, replace seals if necessary, or replace the cylinder. Also, the check valves might not be sealing; repair the check valve.
D
Dawn DickersonNov 3, 2025
Why is the dew point too high in my Sullair SD Dehumidifier?
- A
  amanda38Nov 3, 2025
  If the dew point is too high in your Sullair Dehumidifier, it could be due to several reasons. The operating pressure might be too low, or the air flow capacity might be too high; in this case, increase the operating pressure and reduce the air flow capacity. Another cause could be that the air inlet temperature is too high; reduce the temperature, or connect an air cooler upstream. Also, the differential pressure at the pre-filter might be too high; check the filter element for impurities and change it if necessary. The condensate drain might not be functioning; check its operation and replace it if needed. The desiccant could be soiled or have disintegrated; check the pre-filter for impurities, change the filter element, and replace the desiccant, disposing of the old desiccant. The volu...
W
Wendy RiveraNov 25, 2025
What to do if my Sullair Adsorption Dryer does not switch over?
- L
  Lisa WoodNov 25, 2025
  If your Sullair Adsorption Dryer isn't switching over, it could be due to several factors. The inlet valve combination might not be opening or switching; in this case, check the electrical functioning of the solenoids and replace either the solenoid or the complete valve combination. Another reason could be a non-functioning PLC, so check the PLC and the fuse in the control cabinet. The vessel might not be pressurized, so check whether the blow-off valves are dirty and replace these if necessary; also check the electrical functioning of the solenoids and replace either the solenoid or the complete valve combination. Additionally, the regeneration orifice could be obstructed, so clean or replace it. Lastly, the pressure switch might be defective or set at the wrong pressure (DDS system only...

Summary

Introduction to Sullair SD Dryers

Identification of Safety Signs and Symbols

Personnel Qualification Requirements

Defines the necessary qualifications and training for personnel operating and maintaining the dryer.

Technical Data Sheet and Specifications

Presents detailed technical specifications, including flow capacity, desiccant, and voltage.

Safety Instructions

Outlines essential safety tips for setup, operation, and servicing.

Safety Tips for Maintenance and Assembly

Details safety advice for personnel performing maintenance, inspection, and assembly.

Installation Guide for Sullair SD Dryers

Set-Up and Installation Procedure

Details the procedure for positioning and connecting the adsorption dryer.

Startup and Operation of Sullair SD Dryers

Startup and Shutdown Procedures

Provides essential steps and safety precautions for starting and shutting down the dryer.

Detailed Dryer Operation Description

Details the heatless desiccant dryer's operational cycle and chamber switchover.

Dryer Operating Sequence (No Control;Alarm)

Outlines the step-by-step operating sequence for dryers without control or alarm options.

Dryer Operating Sequence (No Control;Alarm) - Continued

Continues the step-by-step operating sequence for dryers without control or alarm options.

Operating Sequence for DDS Option - Continued

Continues the operating sequence for dryers equipped with the DDS option.

Dryer Alarm System Overview

Describes common and optional alarms, including switching failure and high humidity.

Electrical Control System

DDS Control System Startup and Operation

Provides startup and operation procedures for the DDS control system.

Description of Dryer Operation

Explains the operational principle and automatic cycle of the adsorption dryer.

Operating Sequence for DDS Option

Details the operating sequence for dryers equipped with the DDS option.

Special Equipment Options

DDS Control System Details

Details the Dewpoint Dependant Switching (DDS) system, its components, and performance.

Maintenance Procedures for Sullair SD Dryers

Desiccant Replacement Procedure

Details the procedure for replacing the desiccant material in the dryer.

Filter System Overview

Filter Maintenance and Replacement

Filter Element Changing Procedure

Provides step-by-step instructions for changing filter elements safely.

Regeneration Orifice Changing

Dryer Flow Capacity and Purge Adjustment

Dryer Flow Capacity Model Selection

Inlet Temperature Correction Factors

Purge Pressure Adjustment Procedure

Provides steps and a table for adjusting purge pressure for optimal dryer operation.

Troubleshooting and Faults for Sullair SD Dryers

High Dew Point Causes and Solutions

Lists possible causes and solutions for high dew point issues in the dryer.

Dryer Failure to Switch Over Troubleshooting

Provides troubleshooting steps for when the adsorption dryer fails to switch over.

High Back Pressure During Regeneration

Addresses issues with high back pressure during the regeneration phase.

Shutdown for Faults or Maintenance

Details the procedure for shutting down the dryer in case of faults or for maintenance.

Short-Term Dryer Shutdown Procedure

Outlines the correct procedure for performing a short-term shut-down of the dryer.

Dryer Restarting Procedure

Provides instructions for safely re-starting the adsorption dryer.

Sullair SD Series Specifications

General

Power Supply	Varies by model
Type	Dehumidifier
Capacity	Varies by model
Airflow Capacity	Varies by model
Moisture Removal Capacity	Varies by model
Operating Temperature Range	Varies by model
Dimensions	Varies by model
Weight	Varies by model
Airflow	Varies by model
Operating Temperature	Varies by model