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Rheem RA1748AJ2CB - User Manual

Rheem RA1748AJ2CB
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AIR COOLED
CONDENSING UNITS
92-104921-07-06 (4/18)
Printed in USA
[ ] indicates metric conversions.
Do not destroy this manual.
Please read carefully
and keep in a safe place
for future reference by a
serviceman.
WARNING
THESE INSTRUCTIONS
ARE INTENDED AS AN AID
TO QUALIFIED, LICENSED
SERVICE PERSONNEL FOR
PROPER INSTALLATION,
ADJUSTMENT, AND
OPERATION OF THIS
UNIT. READ THESE
INSTRUCTIONS
THOROUGHLY
BEFORE ATTEMPTING
INSTALLATION OR
OPERATION. FAILURE
TO FOLLOW THESE
INSTRUCTIONS MAY
RESULT IN IMPROPER
INSTALLATION,
ADJUSTMENT, SERVICE,
OR MAINTENANCE
POSSIBLY RESULTING IN
FIRE, ELECTRICAL SHOCK,
PROPERTY DAMAGE,
PERSONAL INJURY, OR
DEATH.
INSTALLATION INSTRUCTIONS
RA17 MODEL SERIES – 17 SEER
WARNING:
RECOGNIZE THIS SYMBOL
AS AN INDICATION OF
IMPORTANT SAFETY
INFORMATION
FEATURING INDUSTRY STANDARD
R-410A REFRIGERANT

Table of Contents

Questions and Answers

  • R
    Rachel HernandezAug 17, 2025
    What to do if my Rheem RA1748AJ2CB unit will not run?
    • J
      john70Aug 17, 2025
      If your Rheem Heat Pump unit isn't running, several factors could be at play. Start by checking for correct voltage at the line voltage connections in the condensing unit. Also, make sure that the thermostat isn't out of calibration or set too high. Inspect the control board diagnostic codes. Look for blown fuses or tripped breakers and replace/reset them as needed. Check the transformer wiring and replace the transformer if it's defective. Reset the high-pressure control if it's open, and also refer to the high head pressure remedy. Do the same for the low-pressure control. Finally, verify the communication wiring if there's miswiring or the communication light is continuously on.
  • G
    Gregory GonzalesAug 19, 2025
    Why is my Rheem Heat Pump compressor short cycling?
    • S
      Sandy TuckerAug 19, 2025
      If your Rheem Heat Pump's compressor is short cycling, it could be due to several reasons. First, check the voltage at the compressor terminals to ensure it's within ±10% of the nameplate marking when the unit is operating. A defective overload protector could also be the culprit, so consider replacing it. Finally, refrigerant undercharge can cause short cycling, so adding refrigerant may solve the issue.
  • D
    Diane JarvisAug 22, 2025
    What causes insufficient cooling in my Rheem RA1748AJ2CB?
    • J
      Jennifer ChenAug 22, 2025
      Insufficient cooling in your Rheem Heat Pump can stem from several causes. The unit might be improperly sized, requiring a recalculation of the load. Improper indoor airflow could be the issue; it should be approximately 400 CFM per ton. An incorrect refrigerant charge can also lead to this problem, so charge the unit per the procedure attached to the service panel. Air, non-condensables, or moisture in the system necessitate recovering the refrigerant, evacuating, and recharging, along with adding a filter drier. A bad ID could also be the cause, in which case it should be replaced.
  • D
    Daniel ThompsonAug 25, 2025
    Why is my Rheem Heat Pump's outdoor fan running, but the compressor isn't?
    • A
      Amy BellAug 26, 2025
      If the outdoor fan is running but the compressor isn't in your Rheem Heat Pump, it could be due to a defective run or start capacitor, which would need replacement. Another possibility is a defective contactor, which should also be replaced. Check for correct voltage at the compressor and ensure all connections are secure. If the compressor is stuck, grounded, has an open motor winding, or an open internal overload, wait at least 3 hours for the overload to reset; if it remains open, replace the compressor. A low-voltage condition might also be the cause, in which case you should add start kit components.
  • T
    Timothy ParkerAug 27, 2025
    What causes high head and high or normal vapor pressure in cooling mode on my Rheem RA1748AJ2CB?
    • B
      Brittany PetersonAug 28, 2025
      High head pressure along with high or normal vapor pressure in cooling mode on your Rheem Heat Pump can be attributed to a dirty outdoor coil, which needs cleaning. It could also be due to refrigerant overcharge, requiring a correction of the system charge. If the outdoor fan isn't running, repair or replace it. The issue might also arise from air or non-condensables in the system, necessitating refrigerant recovery, evacuation, and recharge.
  • E
    Erica BallardAug 30, 2025
    What causes low vapor, cool compressor, and iced indoor coil in my Rheem Heat Pump?
    • C
      Chad JohnsonAug 30, 2025
      A low vapor pressure, cool compressor, and iced indoor coil in your Rheem Heat Pump can be caused by low indoor airflow. Increase the blower speed or reduce restrictions and replace the air filter. Operating below 65°F outdoors can also cause this issue, so add a Low Ambient Kit. Moisture in the system requires refrigerant recovery, evacuation, recharge, and the addition of a filter drier. Finally, a closed ID circuit necessitates repairing or replacing the ID coil.
  • E
    Elizabeth GallegosSep 2, 2025
    Why do the registers sweat on my Rheem RA1748AJ2CB?
    • J
      Johnny ParsonsSep 2, 2025
      Registers sweat on your Rheem Heat Pump due to low indoor airflow. To resolve this, increase the speed of the blower or reduce any restrictions. Also, replace the air filter.
  • R
    rogerballSep 5, 2025
    What causes fluctuating head and vapor pressures in my Rheem Heat Pump?
    • W
      William BaileySep 5, 2025
      Fluctuating head and vapor pressures in your Rheem Heat Pump can occur if the = is hunting. Check the thermistor to vapor line connection. Air or non-condensibles in the system can also cause this issue, requiring refrigerant recovery, evacuation, and recharge.
  • V
    vkingSep 7, 2025
    What causes high vapor pressure in my Rheem RA1748AJ2CB Heat Pump?
    • C
      Connie SimsSep 7, 2025
      High vapor pressure in your Rheem Heat Pump can be caused by an excessive load. Recheck the load calculation. A defective compressor can also be the problem, requiring replacement.
  • H
    hoganbrittanySep 10, 2025
    What causes high head and low vapor pressures in my Rheem RA1748AJ2CB Heat Pump?
    • T
      tarabrowningSep 10, 2025
      High head pressure and low vapor pressures in your Rheem Heat Pump can be caused by a restriction in the liquid line, expansion device, or filter drier. To resolve this, remove or replace the defective component. A bad = can also cause this issue; verify the thermistor and pressure transducer connection and operation.

Summary

Important Safety Information

Safety Warnings and Precautions

Essential safety warnings and cautions for installation and operation of the unit.

Installation

Tools and Refrigerant for R-410 A Systems

Lists required tools and provides essential information on R-410A refrigerant.

Interconnecting Tubing and Charge Adjustment

Refrigerant Tubing Installation Best Practices

Refrigerant Leak Testing Procedures

EcoNet Enabled 2-Stage Control System

Compressor Operation Commands

Exiting Protection Lockout and Test Modes

Procedures for resetting lockouts and entering test/fault recall modes for diagnostics.

ICC Diagnostic Codes and Troubleshooting

Diagnostic Codes Description

Explains the dual 7-segment LED display codes for system status and faults.

Compressor Electrical Fault Codes

Details specific codes for open circuits, start/run issues, and pressure control faults.

System Fault and Control Codes

Covers high pressure faults, temperature sensor issues, internal control faults, and data errors.

ICC Control Operation with Conventional Wiring

Compressor Operation Call and Timers

Active Compressor Protection Modes

Details specific protection modes like low/high pressure, locked rotor, and open start circuit.

Test and Fault Recall Modes Operation

Electrical Wiring

Power Wiring Requirements

Grounding and Control Wiring

Wiring

Power Wiring and Grounding

Start-Up Procedures

Checking Airflow and System Balance

Evacuation and Leak Testing

Critical steps for evacuating the system to remove air/moisture and performing leak tests.

Refrigerant Charge Check Procedures

Methods for checking system charge using various tools and configurations.

Pressure Charging and Subcooling Adjustment

Techniques for gross charging by pressure and fine-tuning the charge using subcooling.

Components and Controls

High- and Low-Pressure Controls (HPC;LPC)

Diagnostics

Electrical Checks Flowchart

A step-by-step guide to troubleshoot electrical issues preventing unit operation.

Cooling Mechanical Checks Flowchart

A flowchart to diagnose mechanical problems affecting cooling performance.

General Troubleshooting Guide

A table correlating symptoms, possible causes, and remedies for common unit issues.

Compressor Overheating Troubleshooting

Identifies causes and remedies for compressor overheating symptoms.

Electrical and Flooded Start Troubleshooting

Addresses electrical faults and issues related to flooded starts in the compressor.

Contamination, Lubrication, and Slugging Issues

Diagnoses and resolves problems related to system contamination, oil loss, and slugging.

Flooding and Electronic Expansion Valve (EEV) Issues

Addresses flooding conditions and troubleshooting for electronic expansion valves.

EEV Troubleshooting and Compressor Issues

Further troubleshooting for EEVs and diagnosing compressor issues like flood back.

Cooling Mode Troubleshooting Indicators

Rheem RA1748AJ2CB Specifications

General IconGeneral
BrandRheem
ModelRA1748AJ2CB
CategoryHeat Pump
HSPF Rating8.2
RefrigerantR-410A
Compressor TypeScroll
Voltage208/230V
Phase1
Cooling Capacity48000 BTU/h
Heating Capacity48000 BTU/h

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