Carrier 38GL028G User Manual

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38GL...G

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

INSTALLATION MANUAL

Table of Contents

Questions and Answers:

L
lauriesmithAug 12, 2025
What to do if my Carrier 38GL028G Air Conditioner compressor and fan of the outdoor unit will not start?
- S
  Stephanie BooneAug 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.
U
usnyderAug 16, 2025
Why does my Carrier Air Conditioner compressor run continuously?
- J
  John BakerAug 16, 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
marvinjonesAug 19, 2025
What to do if my Carrier 38GL028G discharge pressure is too high?
- S
  stevenmaddenAug 19, 2025
  If the discharge pressure is too high, start by cleaning the outdoor coil or removing any obstructions. If the refrigerant charge is too high, drain some refrigerant. Also, if there is air or other non-condensable gases in the circuit, drain the refrigerant, evacuate, and recharge the system. Check the head pressure controller by connecting the fan directly and replace the HPC if necessary.
A
Andrea KempAug 23, 2025
What to do if my Carrier 38GL028G Air Conditioner compressor will not start, but outdoor fan is running?
- S
  Stephen ShafferAug 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.
M
Matthew RodgersAug 27, 2025
What to do if my Carrier Air Conditioner has frequent ice build-up on outdoor coil during heating?
- A
  Andre TorresAug 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.
O
omartinezAug 31, 2025
What to do if my Carrier 38GL028G Air Conditioner compressor starts, but stops due to its overtemperature protection?
- A
  Alicia ZimmermanAug 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
Michael BrownSep 3, 2025
What to do if my Carrier 38GL028G discharge pressure is too low?
- A
  Ashley GarciaSep 4, 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.
L
Lori BryantSep 7, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier 38GL028G Air Conditioner?
- C
  Corey FernandezSep 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.

Carrier 38GL028G Specifications

General

Brand	Carrier
Model	38GL028G
Category	Air Conditioner
Language	English

Summary

Dimensions and Weight

Pipe Connections Guide

Details pipe diameters, lengths, and height differences for unit connections.

Minimum Clearances

Operating Limits Table

Specifies operational temperature and voltage limits for cooling and heating modes.

General Information and Installation Site

Choosing the Installation Site

Guidance on selecting an appropriate location for the outdoor unit, considering various factors.

Installation Warnings

Refrigerant Connections

Flaring Tubing Ends

Instructions on how to properly flare copper tube ends for refrigerant connections.

Unit Connection Torque

Details specific tightening torques for flare nuts and valve caps during connection.

Air Purging Procedure

Describes the essential process of removing air from the refrigerant piping using a vacuum pump.

Electrical Connections (018-024)

Electrical Connections (028-048)

Electrical Connections Summary and Data

Electrical Data Table

Provides power input, starting current, and wiring specifications for various models.

Pump Down and Refrigerant Charge Check

Pump-down Operation

Procedure to collect system refrigerant in the outdoor unit before disconnection or disposal.

Checking Refrigerant Charge

Steps to verify the refrigerant level, especially after leaks or component replacement.

Unit Maintenance and Troubleshooting

Unit Maintenance Procedures

Guidelines for qualified personnel on cleaning coils and general upkeep.

Troubleshooting Common Issues

Lists common operational problems and their solutions for the outdoor unit.

Installation Instructions Supplement (38YYS...G)

Specific Unit Features

Details factory-fitted accessories like HPC, LRPS, and HIP for specific models.

Condensing Temperature Controller Operation

Explains the function and operation of the condensing temperature controller.

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