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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-4423-2
Summarization of Contents
Introduction
Product Overview
Provides a general description of the A-4400 Series Refrigerated Air Dryers and their purpose.
Installation Procedures
Location
Details the required clearances and placement for optimal air circulation and unit access.
Unpacking the Unit
Step-by-step instructions for safely removing the air dryer from its shipping carton.
Conventional Wall Mounting Arrangement
Guides on how to mount the unit on a wall using key slots and specified bolt spacing.
Air Connections
Instructions for connecting the compressed air line to the unit's inlet.
Base Mounting Arrangement
Describes mounting hole patterns for securing the unit to a platform using screws or bolts.
Activated Carbon Filter Installation
Instructions for installing the separately packaged activated carbon oil vapor removal filter.
Drain Connections
Details on connecting drain lines for the automatic condensate drain and oil removal filter.
Permanent Wiring Using Conduit
Steps for converting the unit from a cord and plug to permanent wiring with conduit.
Wiring to Air Compressor
Explains how to wire the air dryer to the air compressor for continuous operation.
Commissioning
Gauge Correction
How to apply factory calibration corrections to the evaporator pressure gauge for accuracy.
Evaporator Pressure Adjustment
Procedures to adjust the expansion valve based on ambient temperature for optimal operation.
Altitude Compensation
Adjusting the expansion valve to compensate for high altitude installations.
Low Ambient Temperature Compensation
Adjusting 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.
Coalescing Oil Removal Filter
Information on the coalescing oil removal filter and its pressure drop indicator.
Replacement Coalescing Oil Removal Filter Element Kit
Steps to replace the filter element, O-rings, and drain valve in the coalescing filter.
Activated Carbon Oil Vapor Removal Filter
Guidance for replacing the activated carbon filter element and noting the replacement date.
Pressure Reducing Valve
Instructions for adjusting the pressure reducing valve to the desired output pressure.
Power On/Fail Lamp
Procedure for replacing the power on/fail lamp if it is not illuminated when the unit is powered.
Refrigeration Service
General guidance for servicing the refrigeration system, including expansion valve adjustment.
Condenser Fan Motor Replacement
Detailed steps for replacing the condenser fan motor assembly.
Condenser
Advice on cleaning the condenser fins for optimal heat transfer.
Air Dryer Compressor Motor Wiring Circuit
Troubleshooting steps for the compressor motor wiring circuit using an ohmmeter.
Excessive Vibration
Procedures to diagnose and correct excessive vibration, likely due to misaligned fan blades.
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