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Addison PR Series - User Manual

Addison PR Series
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NOT FOR RESIDENTIAL USE
NOTICE
Installer:
Please take the time to read and understand the
instructions contained inside this manual prior to
any installation. The installer must give a copy of this
manual to the unit owner.
Owner:
Keep this manual in a safe place in order to provide
service technicians with necessary unit information.
Packaged
Rooftop DOAS &
Recirculation Unit
Installation, Operation,
& Maintenance Manual
PR**036 PR**048
PR**060 PR**072
PR**084 PR**096
PR**120 PR**150
PR**180 PR**210
PR**240 PR**300
PR**360 PR**420
PR**480 PR**540
PR**600 PR**720
PR**780 PR**840
PR Series

Table of Contents

Questions and Answers

  • G
    Glenda JonesAug 30, 2025
    What to do if Addison Air Conditioner blower motor runs, but fans do not supply enough make-up air?
    • N
      nancybryantAug 30, 2025
      If the blower motor runs but the fans don't supply enough make-up air in your Addison Air Conditioner, start by checking if the intake filters are dirty and replace or clean them. Then, look for any obstructions in the intake, ensuring dampers operate properly and clearing any blockages. Make sure the fan wheel is not loose on the shaft; reposition and tighten if necessary. Ensure all access doors and panels are closed. Finally, address excessive discharge resistance by cleaning filters and/or readjusting dampers.
  • D
    Daniel EdwardsAug 30, 2025
    What causes suction pressure to be too low in Addison PR?
    • D
      dwestAug 30, 2025
      If the suction pressure is too low in your Addison Air Conditioner, it could be due to several reasons. Check pressures and subcooling to see if the unit is undercharged with refrigerant. Ensure the blower is not running backwards by interchanging any two wires connected to the motor. Inspect the expansion valve for defects or improper adjustment, checking superheat and adjusting the TXV as needed. A dirty filter can also cause this issue, so check the filter and evaporator coil. Too little airflow or low entering air temperature can be factors, so check airflow and entering air wet bulb conditions. Finally, look for any restrictions in the suction or liquid line.
  • U
    unavarroAug 31, 2025
    Why is the supply air temperature too high in my Addison PR Air Conditioner?
    • K
      Kevin HendersonAug 31, 2025
      If the supply air temperature from your Addison Air Conditioner is too high, it could be due to a refrigerant undercharge or a leak in the system, so check subcooling and look for leaks. The evaporator might be plugged with dirt or ice, so check the evaporator, airflow, and filter. The expansion valve could be improperly adjusted or defective, so check superheat and adjust the TXV, also check the bulb. There might be a defective compressor, so check the compressor for proper operation. High discharge pressure can cause this, and the airflow may be too high, so check external static pressure.
  • C
    Carla VargasAug 25, 2025
    Why Addison PR compressor will not start?
    • S
      Steven BrownAug 25, 2025
      If the compressor of your Addison Air Conditioner won't start, first check the disconnect switch, fuses, and wiring to ensure they are properly connected and functioning. If the compressor is hot, allow it to cool for two hours. Also, check the voltage to the contactor coil, transformer slave relay, and thermostat. Verify the calibration of the high or low pressure switch and check the oil failure control. Finally, check the compressor for electrical failure, and verify it is not seized.
  • B
    Brenda WeberSep 1, 2025
    What causes high suction pressure in Addison PR Air Conditioner?
    • J
      Jessica HarrisSep 2, 2025
      High suction pressure in your Addison Air Conditioner can be caused by several factors. An excessive load on the evaporator coil can lead to this, so check for high entering wet bulb temperature and excessive airflow. If the compressor is unloaded, recalibrate the unloader pressure switch. A leaking check valve can also be responsible, so check the temperature across the check valve. Finally, ensure the expansion valve is secured to the suction line and that the TXV is functioning correctly, ensuring the bulb is insulated.
  • R
    Rick MorseSep 2, 2025
    Why Addison PR Air Conditioner suction line frosting?
    • P
      psanfordSep 2, 2025
      If your Addison Air Conditioner's suction line is frosting, check for insufficient evaporator airflow, which could be caused by issues with the fan VFD or closed dampers. Another cause could be a restriction in either the suction or liquid line. Also, consider the possibility of a malfunctioning or defective expansion valve, and inspect the bulb of the TXV.
  • D
    David ObrienSep 3, 2025
    What causes Addison PR compressor to short cycle?
    • J
      Justin Clay MDSep 3, 2025
      If your Addison Air Conditioner compressor is short cycling, it could be due to several reasons. The thermostat location or malfunction can cause this, so check the thermostat and heat anticipator setting. Improper refrigerant charge can also be a factor, so check subcooling and verify superheat. A defective high or low pressure control can cause short cycling, so check the high or low pressure switch. Cycling on internal overload can be an issue. A defective expansion valve can also contribute to this problem, so check the TXV and superheat. Poor air distribution, high discharge pressure, or leaking discharge valves in the compressor can also cause short cycling.
  • K
    Kim WalkerSep 3, 2025
    Why Addison PR liquid line too hot?
    • S
      scottfernandezSep 3, 2025
      If the liquid line in your Addison Air Conditioner is too hot, it could be due to a refrigerant undercharge or high discharge pressure. There may also be a restriction upstream at the point of frosting.
  • J
    Jason RobertsSep 4, 2025
    What causes head pressure to be too low in Addison PR?
    • B
      breynoldsSep 4, 2025
      If the head pressure is too low in your Addison Air Conditioner, it could be due to an insufficient refrigerant charge. A defective or improperly adjusted expansion valve can cause this issue. Low suction pressure, condenser fan control setting, or a defective compressor may also be to blame.
  • M
    mfordSep 5, 2025
    Why Addison PR Air Conditioner supply air temperature is too low?
    • L
      leewilliamSep 5, 2025
      If the supply air temperature from your Addison Air Conditioner is too low, it could be due to low airflow. Additionally, the return air temperature might be too low.

Summary

Safety Introduction and Labeling Guide

Introduction and Pre-Installation

Description of Operation

Overview of the PR Series unit's functions and capabilities.

Inspection and Setup

Procedures for inspecting the unit upon receipt and initial setup.

Unit Nomenclature Example

Installer Responsibility

Corrosive Chemicals

Information on handling and avoiding corrosive chemicals near the unit.

Required Equipment and Materials

List of tools and materials needed for installation and start-up.

Critical Considerations

Required Clearances

Specifies minimum distances from objects for service access and operation.

National Standards and Applicable Codes

Refrigerant Handling Practices

Guidelines for handling refrigerants according to national and local codes.

Fuel Codes

Requirements for fuel type and installation based on codes.

Installation Codes

Standards for installing air conditioning and ventilation systems.

Aircraft Hangars

Codes applicable for installation in aircraft hangars.

Parking Structures and Repair Garages

Codes applicable for installation in garages.

Electrical

Requirements for electrical connections and compliance with codes.

Venting

Requirements for venting optional gas furnaces according to codes.

High Altitude

Information on approved installations at high altitudes.

Lifting a Packaged Rooftop Unit

Moving;Lifting an Air Conditioning Unit

Procedures for safely moving and lifting the unit.

Preparation for Moving;Lifting

Steps to take before moving or lifting the unit for safety.

Moving with a Forklift

Guidelines for safely moving the unit using a forklift.

Lifting with a Crane

Instructions for safely lifting the unit using crane equipment.

Unit Placement

Roof Installation on Curb

Instructions for installing the unit on a roof curb.

Roof Curb Assembly and Installation

Steps for assembling and installing the roof curb.

Unit Mounting to Roof Curb

Procedure for mounting the unit onto the installed roof curb.

Unit Mounting to Ground Pad

Instructions for mounting the unit on a ground pad.

Ductwork Consideration

Inlet Ductwork

Specifications for inlet ductwork size and air quality.

Return Air Ductwork

Specifications for return air ductwork size.

Discharge Ductwork

Specifications for discharge ductwork size.

Refrigeration Circuits and Piping

Refrigerant

Details on the R-410A refrigerant and POE oil used in the unit.

Components and Configurations

Lists common components and variations in refrigeration circuits.

Energy Recovery;Conservation Wheels

Principal of Operation

Explains the operation of the energy conservation wheel module.

Gas Heater Packages

Principle of Operation

Overview of the 80% efficient self-contained duct gas furnace.

Gas Piping and Pressure

Requirements for gas piping and pressure compliance.

Operating and Safety Controls

Wiring

Sequence of Operation

Sequence of Operation for Modulating Furnace

Electric Heater Packages

Principle of Operation

Overview of the self-contained duct electric heater.

Operating and Safety Controls

Details safety systems and operating controls for electric heaters.

Wiring

Electrical wiring and connection requirements for electric heaters.

Unit Electrical

Wiring and Electrical Connections

Guidelines for all electrical wiring and connections, including grounding.

Disconnect

Requirements for external weather-tight disconnect switches.

Current Draw

Information on unit current draw requirements.

Wiring Connections

Instructions for connecting main power wiring.

Voltage Unbalance

Checks for voltage and phase unbalance and how to calculate it.

Low Voltage Wiring

Table listing minimum 24-volt class 2 wire sizes for different runs.

Phase Monitor Data

Purpose of the Phase Monitor

Monitors line voltage and phase for system protection.

Phase Monitor Operation

How the DPM functions when voltages are within parameters.

Custom Set-Up

Using membrane buttons to change set-up criteria.

Sequence of Operation

Unit Configuration

How unit functionality is achieved based on application.

Controls Options

Overview of different control options available for the unit.

ALC DDC Controller with Sensors

Details on the factory-mounted ALC DDC controller.

Factory-Mounted DDC Controls (by others)

DDC controls mounted by factory per customer specifications.

Terminal Strip for Field-Mounted DDC Controls

Connecting field-supplied DDC controls to a terminal strip.

Terminal Strip for Electromechanical Controls

Connecting thermostats to factory-wired terminal strips.

Start-Up Procedure

Installation Code and Maintenance Requirements

Ensuring installation and service comply with codes and manuals.

Tools & Supplies Required

List of essential tools and supplies for unit start-up.

Ductwork and Electrical Connections

Checks for proper ductwork and electrical connections before start-up.

Pre-Start Checklist

Start-Up Notes

Important notes for the start-up technician.

Start-Up Form

General Information

Application Information

Unit Nameplate Information

Unit Information

Start-Up Check

Cooling Check

Cooling Check (Continued)

Heating Check

Energy Conservation Wheel Data

Unit Maintenance

Installation Code and Quarterly Inspections

Ensuring installation and service comply with codes and manuals.

Maintenance Guidelines

General Maintenance

General maintenance checks and follow-up on start-up procedures.

Unit Exterior Maintenance

Cleaning and inspecting the unit's exterior.

Supply and Exhaust Fan Maintenance

Inspection and maintenance of supply and exhaust fan motors.

Condensing Fan Maintenance

Checking condensing fan assemblies for free movement and tight hardware.

Refrigeration Circuit Maintenance

Cleaning evaporator and condenser coils, checking compressors.

Condensate Drain Pan and Drain Maintenance

Checking and cleaning condensate drain pans and drains.

Damper Maintenance

Cleaning damper blades and checking linkages.

Electric Heater Wiring Maintenance

Checking wiring connections and heating elements.

Filter Maintenance

Checking filters for dirt restriction and replacing as needed.

Replacement Parts

Troubleshooting

Addison Warranty

Addison Warranty (Continued)

Revision Guide

Addison PR Series Specifications

General IconGeneral
BrandAddison
ModelPR Series
CategoryAir Conditioner
LanguageEnglish

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