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© 2016 Johnson Controls, Inc.
Part No. 64-378-14, Rev. D
Code No. LIT-718050T
A-4400 Series Refrigerated Air Dryers
Installation and Maintenance
64- 378- 14, Rev. D
Technical Bulletin A-4400
Issue Date 0316
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Table of Contents
Related Manuals for Johnson Controls A-4423-1
Summarization of Contents
INTRODUCTION
Product Overview
Details the features and purpose of the A-4400 Series Refrigerated Air Dryers for continuous operation.
INSTALLATION PROCEDURES
Location
Specifies the required clearances and environmental conditions for installing the A-4400 Series Refrigerated Air Dryer.
Unpacking the Unit
Provides step-by-step instructions for safely removing the A-4400 dryer from its shipping carton.
Conventional Wall Mounting Arrangement
Describes how to mount the A-4400 dryer on a wall using key slots and specified bolt spacing.
Air Connections
Explains how to connect the compressed air line to the A-4400 dryer's inlet and outlet connections.
Base Mounting Arrangement
Details the mounting hole patterns on the base of the A-4400 for securing it to a platform.
Activated Carbon Filter Installation
Guides the installation of the activated carbon oil vapor removal filter on models with an optional purification system.
Drain Connections
Describes how to connect drain lines for the automatic condensate drain trap and coalescing oil removal filter.
Permanent Wiring Using Conduit
Provides instructions for converting the A-4400 dryer's corded plug to permanent wiring using conduit.
Wiring to Air Compressor
Explains how to wire the A-4400 dryer to the air compressor for continuous operation.
COMMISSIONING
Gauge Correction
Details how to apply factory-recorded corrections to the evaporator pressure gauge for accurate readings.
Evaporator Pressure Adjustment
Guides the adjustment of the expansion valve based on corrected pressure and ambient temperature for optimal operation.
Altitude Compensation
Explains how to adjust the expansion valve setting to compensate for high altitude installations.
Low Ambient Temperature Compensation
Describes how to adjust the expansion valve for operation in low ambient temperatures to prevent freeze-up.
SERVICING PROCEDURES
Particle Filter
Instructions for replacing the particle filter element and/or automatic drain valve on the A-4400 dryer.
Coalescing Oil Removal Filter
Explains the function of the coalescing oil removal filter and its pressure drop indicator for replacement.
Replacement Coalescing Oil Removal Filter Element Kit
Step-by-step guide to replace the coalescing filter element and associated O-rings.
Activated Carbon Oil Vapor Removal Filter
Guidance for replacing the activated carbon filter element and recording the next replacement date.
Pressure Reducing Valve
Instructions on how to adjust the pressure reducing valve for optimal performance.
Power On/Fail Lamp
Procedure for replacing the power on/fail lamp if it is not illuminated when the dryer is running.
Refrigeration Service
Covers troubleshooting and adjustment of the expansion valve for refrigeration system issues.
Condenser Fan Motor Replacement
Detailed steps for replacing the condenser fan motor assembly on the A-4400 dryer.
Condenser
Routine checks for dust/particle buildup on the condenser fins and cleaning methods.
Air Dryer Compressor Motor Wiring Circuit
Electrical checks and troubleshooting steps for the compressor motor wiring circuit.
Excessive Vibration
Procedure for diagnosing and correcting excessive vibration, likely due to misaligned fan blades.
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