Addison DCA Series - User Manual

INSTALLATION OPERATION and MAINTENANCE MANUAL
100% Outside Air Cooling/Dehumidifying Units
High Efficiency Packaged PCA/DCA Systems
CONTENTS PAGE
Safety Labeling and Signal Words......................2
General Description............................................3
Unit Location ......................................................3
Installation.................................................. 3, 4, 5
Sequences of Operation ................................ 5-10
Start-up Procedures..........................................10
Preparing Equipment for Operation.............10, 11
Service.........................................................11, 12
Typical Wiring Diagrams...............................13-16
Adjustable Belt Drive Blower............................17
General Service Guide ..................................18-20
Check, Test and Start Form ..............................21
WARNING: READ SAFE OPERATION RULES AND MANUAL CAREFULLY
APPLICATION
PCA Series endflow packaged and DCA Series Down
discharge air conditioners are designed to cool and
dehumidify 100% outside air for those applications
requiring make up air cooling. These units should not
be used as the primary source of cooling or heating
the conditioned space.
Safe Operation Rules
Please take a few minutes to read our instructions
before you install and use your air conditioner. This will
help you obtain the full value from your air conditioner.
It will also help you avoid any needless service costs
that result from causes we cannot control and cannot
cover in our warranty.
Follow these rules and the instructions carefully.
Failure to do so could cause a malfunction of the air
conditioner, resulting in injury, death and/or property
damage.
Check local codes and utility standards. The
installation must comply with their rules.
Always shut off electric power before making unit
connections or removing any panels.
During installation or servicing, be extremely careful to
avoid injury. Components may have sharp edges or
protrusions which can cut you. Tubing and
compressor(s) contain high pressure refrigerant—they
must not be exposed to high temperature or be
punctured.
Operational failure of this unit for any reason, including but not limited to mechanical or electrical failure of devices
internal or external to the unit, loss of fuel such as natural or LP gas, or interruption of electric power may result in
the introduction of large volumes of air into the conditioned space that could cause freeze or other damage to
property.
It is the responsibility of the installer and/or user of this unit to provide equipment such as a source of emergency
heat, alarm systems, or supervisory systems to warn of such failures.
Form #0527N-0831B (0609)
!
CAUTION

Summary

Application and Safety Overview

Safe Operation Rules

Critical safety guidelines before installing and using the air conditioner.

General Cautionary Notes

Operational failure warnings and responsibility for safeguards.

Safety Labeling and Signal Words

Signal Word Definitions and Usage

Explains DANGER, WARNING, and CAUTION signal words and their application.

Product Label Examples

Illustrates product labels with color explanations and hazard warnings.

Refrigerant Safety Warning

Warning regarding HFC-(R410A) refrigerant and U.S. Clean Air Act requirements.

Unit Location and Installation Principles

General Unit Location Guidelines

Specifies clearances and placement considerations for unit installation.

Codes and Installation Compliance

Emphasizes adherence to local codes, ordinances, and installation procedures.

Curb and Protrusion Checks

Details requirements for roof curb installation and checking for protrusions.

Unit Installation and Electrical Connections

Rigging, Ductwork, and Condensate Piping

Procedures for rigging, ductwork, and condensate drainage.

Electrical Wiring and Grounding

Instructions for power wiring, control wiring, and proper grounding of the unit.

Voltage Checks and Sequences of Operation

Voltage Unbalance Calculation

Method for calculating and checking phase voltage unbalance percentage.

Mechanical Cooling and Head Pressure Control

Describes compressor operation and VARISPEED fan control.

Optional Reheat System Descriptions

Optional Hot Gas Reheat System

Details the components and operation of the factory installed hot gas reheat circuit.

Optional Reheat Plus System

Describes the subcooling coil added for humidity control and efficiency.

Reheat System Applications

Reheat Plus Application and Benefits

Explains the application of Reheat Plus for 100% OA systems and efficiency gains.

Hot Gas Reheat Application

Details the use of hot gas reheat for humidity control in conditioned spaces.

Reheat Operation and System Controls

Reheat Operation and Refrigerant Flow

Describes hot gas bypass, solenoid valves, and refrigerant flow control.

System Control Options

Outlines control methods using thermostats, humidistats, and DDC.

Start-Up Procedures and Safety Warnings

Blower and Phasing Check

Step-by-step procedure to check blower rotation and electrical phasing.

Start-Up Safety Precautions

Critical warnings regarding electrical shock, fire, explosion, and moving parts.

Equipment Preparation and Field Adjustments

Pre-Start Checklist Items

Comprehensive list of checks before unit start-up, including location, wiring, and filters.

Field Adjustments for Operation

Procedures for setting up the unit, charging refrigerant, and adjusting bypass valve.

Service and Maintenance Guidelines

Routine Maintenance Tasks

Procedures for cleaning filters, checking belts, drains, bearings, and cabinet finish.

Parts Security and Cabinet Features

Checking for loose parts and understanding weep holes for drainage.

Compressor Service and Parts Ordering

Compressor Replacement Procedure

Detailed steps for isolating, removing, and installing a compressor.

Ordering Replacement Parts

Information on how to report shortages or damaged parts and order replacements.

Wiring Diagrams Overview

208;230-1-60 Wiring Diagram

Schematic for typical 208/230 volt, single-phase, 60 Hz wiring.

208;230-3-60 Wiring Diagram

Schematic for typical 208/230 volt, three-phase, 60 Hz wiring.

460-3-60 Wiring Diagram

Schematic for typical 460 volt, three-phase, 60 Hz wiring.

380;415-3-50 Wiring Diagram

Schematic for typical 380/415 volt, three-phase, 50 Hz wiring.

Wiring Diagram Legends and Notes

Explanations of abbreviations, symbols, and important wiring notes.

Adjustable Belt Drive Blower Service

Belt Drive Safety Precautions

Essential safety rules for working near belt drives, including power off.

Adjusting Blower Speed

Step-by-step guide to adjusting the variable speed pulley for desired blower speed.

Pulley Alignment and Tensioning

Procedures for checking pulley alignment and setting belt tension.

General Service Guide - Compressor Troubleshooting

Compressor Start-Up Issues

Diagnosing problems when the compressor fails to start or cuts out.

Compressor Overload and Noise Issues

Troubleshooting thermal overload cutouts, oil failure controls, and noisy compressors.

General Service Guide - Pressure and Airflow Troubleshooting

Blower and Noise Troubleshooting

Identifying causes for noisy operation related to blowers and system noise.

High;Low Suction and Discharge Pressure Issues

Diagnosing problems related to abnormal suction or discharge pressures.

Compressor Short Cycling and Low Head Pressure

Troubleshooting compressor short cycling and low head pressure conditions.

General Service Guide - Operational Cycle Troubleshooting

Continuous Operation and Temperature Issues

Diagnosing issues with long running cycles or incorrect supply air temperatures.

Liquid Line and Suction Line Issues

Troubleshooting problems with liquid lines, suction lines, and frosting.

Blower Motor Not Running Troubleshooting

Identifying causes for the blower motor failing to run or tripping overload.

Addison DCA Series Specifications

General

Brand	Addison
Model	DCA Series
Category	Air Conditioner
Language	English