Rheem RA1448AJ1NA User Manual

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AIR COOLED

CONDENSING UNITS

92-104921-09-07 (5/16)

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

(-)A13, (-)A14 & (-)A16 MODEL SERIES –

13, 14 & 16 SEER

WARNING:

RECOGNIZE THIS SYMBOL

AS AN INDICATION OF

IMPORTANT SAFETY

INFORMATION

ST-A1226-01-00

FEATURING INDUSTRY STANDARD

R-410A REFRIGERANT

earth friendly refrigerant

e

ar

t

h

r

y r

dly

dl

e

n

rie

i

fr

h

NOTE: Actual unit appearance

may vary.

Table of Contents

Questions and Answers:

A
Andrea PhillipsAug 22, 2025
How to fix insufficient cooling in Rheem Air Conditioner?
- J
  janicewilliamsonAug 22, 2025
  Insufficient cooling in your Rheem Air Conditioner can stem from several issues. The unit might be improperly sized, requiring a recalculation of the load. There could be improper indoor airflow; check to ensure it's approximately 400 CFM per ton. An incorrect refrigerant charge is another possibility; charge the system per the procedure attached to the unit service panel. Also, air, noncondensibles, or moisture in the system can cause this problem, requiring refrigerant recovery, evacuation, and recharge, along with the addition of a filter drier. Finally, a faulty ID TXV could be the culprit, necessitating replacement.
J
Joshua FoxAug 23, 2025
Why are the registers sweating in my Rheem Air Conditioner system?
- V
  Veronica MillerAug 25, 2025
  If the registers in your Rheem Air Conditioner system are sweating, it's likely due to low indoor airflow. Try increasing the blower speed or reducing any restrictions in the airflow. Replacing the air filter can also help.
E
Eric JonesAug 25, 2025
How to troubleshoot a Rheem RA1448AJ1NA Air Conditioner that will not run?
- F
  frankhoganAug 25, 2025
  If your Rheem Air Conditioner unit won't run, several factors could be the cause. It could be due to a power outage or loose electrical connection, so check the voltage at the line voltage connections. The thermostat might be out of calibration, so try resetting it. A blown fuse or tripped breaker can also prevent the unit from running, so replace the fuses or reset the breaker. Other potential issues include a defective transformer (check the wiring and replace if necessary), an open high-pressure control (reset it), an open low-pressure control, a defective control board (check diagnostic codes), or miswiring of communications (check communication wiring).
L
Lisa MerrittAug 27, 2025
What to do if Rheem RA1448AJ1NA compressor short cycles?
- S
  Scott FarleyAug 27, 2025
  If your Rheem Air Conditioner's compressor is short cycling, several factors could be responsible. First, check the voltage at the compressor terminals; it must be within ± 10% of the nameplate marking when the unit is operating. A defective overload protector could also be the cause, requiring replacement. Lastly, a refrigerant undercharge might be the issue, in which case you should add refrigerant.
J
Joseph HendersonAug 27, 2025
What causes Rheem RA1448AJ1NA outdoor fan to run but compressor not?
- A
  Anthony JohnsonAug 27, 2025
  If the outdoor fan of your Rheem Air Conditioner is running but the compressor isn't, it could be due to several reasons. A defective run or start capacitor may be the cause, requiring replacement. The contactor could also be defective and need replacement. Check for correct voltage at the compressor and ensure all connections are tight, as a loose connection could be the problem. The compressor might be stuck, grounded, have an open motor winding, or an open internal overload; wait at least 3 hours for the overload to reset, and if it remains open, replace the compressor. A low-voltage condition could also be the cause, in which case you should add start kit components.
M
marymartinAug 28, 2025
Why does my Rheem Air Conditioner have high head pressure in cooling mode?
- P
  Pamela PageAug 29, 2025
  High head pressure in cooling mode for your Rheem Air Conditioner can result from a few issues. The outdoor coil might be dirty, so cleaning it is recommended. Refrigerant overcharge could also be the problem, requiring a correction of the system charge. If the outdoor fan isn't running, it needs repair or replacement. Finally, air or noncondensibles in the system could be the cause, requiring refrigerant recovery, evacuation, and recharge.
B
bushcraigAug 30, 2025
Why is my Rheem RA1448AJ1NA Air Conditioner's indoor coil iced?
- M
  Maurice DanielsAug 30, 2025
  An iced indoor coil, accompanied by low vapor and a cool compressor in your Rheem Air Conditioner, can be attributed to several factors. Low indoor airflow could be the culprit; increase the blower speed or reduce restrictions, and replace the air filter. If you're operating below 65°F outdoors, consider adding a Low Ambient Kit. Moisture in the system can also lead to this issue, requiring refrigerant recovery, evacuation, recharge, and the addition of a filter drier. Lastly, a closed ID circuit might be the cause, necessitating repair or replacement of the ID coil.
X
xjonesAug 31, 2025
What causes high vapor pressure in Rheem RA1448AJ1NA?
- K
  kennethhopkinsAug 31, 2025
  High vapor pressure in your Rheem Air Conditioner can be caused by an excessive load, so recheck the load calculation. It may also be due to a defective compressor, which would require replacement.
R
Richard WoodsSep 1, 2025
What causes high head and low vapor pressures in Rheem RA1448AJ1NA Air Conditioner?
- K
  Kristen FloresSep 1, 2025
  High head pressure combined with low vapor pressures in your Rheem Air Conditioner typically indicates a restriction in the liquid line, expansion device, or filter drier. Remove or replace the defective component. It can also be caused by a bad TXV, which needs to be replaced.
J
Julia Todd DDSSep 3, 2025
What does low head and high vapor pressures mean for Rheem RA1448AJ1NA Air Conditioner?
- M
  mariocolemanSep 3, 2025
  Low head pressure coupled with high vapor pressures in your Rheem Air Conditioner can point to a bad TXV, which requires replacement. Another potential cause is a bad compressor, which would also need replacing.

Rheem RA1448AJ1NA Specifications

General

Type	Split System Air Conditioner
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Compressor Type	Scroll
Cooling Capacity	4 Ton
SEER Rating	14
Stages	Single Stage
Cooling Capacity (BTU)	48000 BTU

Summary

IMPORTANT SAFETY INFORMATION

Safety Warnings and Cautions

Key safety directives and precautions for installation and operation.

INSTALLATION

Site Selection and Location Considerations

Guidance on selecting optimal outdoor unit placement, addressing space, environment, and noise.

TOOLS AND REFRIGERANT

INTERCONNECTING TUBING

WIRING

Power Wiring and Grounding

Procedures for connecting power supply and ensuring proper unit grounding for safety.

START-UP

Airflow Verification and System Setup

Evacuation and Leak Testing Procedures

Critical steps for removing air and moisture and performing final leak checks.

REFRIGERANT CHARGE ADJUSTMENT

Refrigerant Charge Calculation and Adjustment

Comprehensive guide to checking and adjusting system refrigerant charge for optimal performance.

DIAGNOSTICS

Electrical System Troubleshooting

Cooling Mode Mechanical Troubleshooting

Common System Problems and Remedies

Comprehensive table listing common system issues, their causes, and recommended solutions.

Compressor and Refrigerant System Diagnostics

Detailed diagnostics for compressor issues, refrigerant problems, and expansion valve malfunctions.

WIRING DIAGRAMS

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