Carrier 38GL048G User Manual

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38GL...G

38YY...G / 38YYS...G

INSTALLATION MANUAL

Table of Contents

Questions and Answers:

C
Caroline RussellAug 12, 2025
What to do if my Carrier Air Conditioner compressor and fan of the outdoor unit will not start?
- K
  Kimberly DennisAug 12, 2025
  If the compressor and fan of the outdoor unit won't start, begin by checking the mains power connections and ensuring the unit is switched to the ON position. If that doesn't work, wait for 3 minutes to see if the compressor cycling protection is active. Check and eliminate the cause (refer to “Additional installation instructions”). Also, examine the electrical connections for looseness or errors and repair them if necessary.
M
Mary ColeAug 15, 2025
Why does my Carrier 38GL048G compressor run continuously?
- S
  Sherry GardnerAug 15, 2025
  If the compressor runs continuously, check the temperature selection. A low refrigerant charge could also be the cause, so verify and add refrigerant if needed. Additionally, air or other non-condensable gases in the circuit might be the issue, requiring you to drain the refrigerant, evacuate, and recharge the system. Finally, check for any obstructions and clean the filter.
M
Marcus TaylorAug 23, 2025
What to do if my Carrier 38GL048G Air Conditioner compressor will not start, but outdoor fan is running?
- R
  Rachel ButlerAug 23, 2025
  If the compressor won't start but the outdoor fan is running, check the compressor's electrical connections for looseness or errors and repair them. Also, the compressor might be burnt out, seized, or its protection device could be activated, so check for the cause and replace the compressor if necessary.
J
Joseph RamosAug 27, 2025
What to do if my Carrier Air Conditioner has frequent ice build-up on outdoor coil during heating?
- C
  Christopher OnealAug 27, 2025
  If there's frequent ice build-up on the outdoor coil during heating, check if the outdoor fan is working correctly and repair if needed. Also, check the electrical connections between the indoor and outdoor units and repair any wrong connections.
X
xlopezAug 31, 2025
What to do if my Carrier 38GL048G Air Conditioner compressor starts, but stops due to its overtemperature protection?
- A
  Anna WarrenAug 31, 2025
  If the compressor starts but stops due to overtemperature protection, it could be due to a wrong refrigerant charge (excessive or low) or air/non-condensable gases in the circuit; in this case, drain refrigerant, evacuate, and recharge. Remove any obstructions. Check cause and repair. Check and replace. Check and remove obstructions.
M
Mary YoungSep 3, 2025
What to do if my Carrier 38GL048G Air Conditioner discharge pressure is too low?
- W
  Wanda LiuSep 3, 2025
  If the discharge pressure is too low, it could be due to a low refrigerant charge, in which case you should add refrigerant. Another cause could be a dirty or obstructed outdoor coil, so clean or remove any obstructions. Also, a dirty indoor unit air filter can cause this issue, so clean the filter.
R
reneebakerSep 7, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier 38GL048G Air Conditioner?
- E
  Elizabeth OconnellSep 7, 2025
  If the outdoor fan is cycling due to its overtemperature protection, the fan capacitor might be faulty, so replace it. Check connections and repair.
C
charlesgarciaSep 10, 2025
What to do if my Carrier Air Conditioner discharge pressure is too high?

Carrier 38GL048G Specifications

General

Brand	Carrier
Model	38GL048G
Category	Air Conditioner
Language	English

Summary

INSTALLATION MANUAL

Installer and Service Technician Attention

Critical safety and operational guide for installers and technicians.

Dimensions and Weight Specifications

Connection Requirements

Details pipe length, height differences, and pipe diameter for system connections.

Minimum Clearance Guidelines

Operating Limit Parameters

Specifies outdoor/indoor temperature limits for cooling and heating modes.

General Installation Information

Unit Installation Procedures

Step-by-step guide for installing the outdoor unit.

Choosing the Installation Site

Recommendations and considerations for selecting the optimal location.

Installation Warnings and Avoidances

Refrigerant Connection Guidelines

Tubing Preparation and Connections

Flaring Tubing Ends

Proper technique for flaring copper tube ends for secure connections.

Unit Connection and Tightening

Connecting tubing to the unit and critical torque specifications.

Refrigerant System Purging and Leak Check

Air Purging Process

Method for purging air from the piping using a vacuum pump.

Electrical Connections (018-024 Size)

Electrical Connections (028-048 Size)

General Electrical Connection Information

Electrical Data Table

Power input, starting current, and main power connection details.

Refrigerant Pump Down and Charge Check

Maintenance and Troubleshooting

Unit Maintenance Procedures

Instructions for cleaning coils and general upkeep.

Troubleshooting Common Issues

Guide to diagnose and resolve various operational problems.

Heat Pump Specific Installation Details

Special Unit Features

Description of HPC, LRPS, and HIP for heat pump models.

Operating Range for Heat Pumps

Specifies operating limits relevant to heat pump functionality.

Condensing Temperature Controller

Wiring Diagram and Operation

Wiring and operational principles of the condensing temperature controller.

Controller Troubleshooting

Addresses issues related to the condensing temperature controller.

Temperature Setting Configuration

Details on setting parameters for the head pressure controller.

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