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Carrier 38YY-36G - User Manual

Carrier 38YY-36G
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38GL...G
38YY...G / 38YYS...G
INSTALLATION MANUAL

Table of Contents

Questions and Answers

  • J
    Julie JacksonAug 13, 2025
    What to do if my Carrier 38YY-36G compressor and fan of the outdoor unit will not start?
    • J
      James HarrisAug 13, 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.
  • B
    Bradley RobertsAug 17, 2025
    Why does my Carrier 38YY-36G Air Conditioner compressor run continuously?
    • G
      Gina ElliottAug 17, 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.
  • G
    gleeAug 21, 2025
    What to do if my Carrier 38YY-36G discharge pressure is too high?
    • L
      Luis AnthonyAug 21, 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.
  • J
    juliedorseyAug 25, 2025
    What to do if my Carrier 38YY-36G Air Conditioner compressor will not start, but outdoor fan is running?
    • M
      Mark DuranAug 25, 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.
  • D
    Dustin LopezAug 28, 2025
    What to do if my Carrier Air Conditioner has frequent ice build-up on outdoor coil during heating?
    • M
      Michelle GreenAug 28, 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.
  • A
    aaronhayesSep 1, 2025
    What to do if my Carrier 38YY-36G Air Conditioner compressor starts, but stops due to its overtemperature protection?
    • M
      Morgan GreeneSep 1, 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.
  • C
    codybennettSep 4, 2025
    What to do if my Carrier 38YY-36G Air Conditioner discharge pressure is too low?
    • J
      jennifer07Sep 5, 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.
  • M
    Mr. Jeremy HermanSep 9, 2025
    What causes outdoor fan cycling due to its overtemperature protection in Carrier 38YY-36G?
    • N
      Nathan BerrySep 9, 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.

Summary

Carrier 38 GL...G; 38 YY...G; 38 YYS...G Installation Manual

Important Installer and Service Technician Attention

Crucial advice for installers and technicians regarding R-410A refrigerant and system handling.

Dimensions and Weight

Specifies the physical dimensions and weight of the outdoor units across different models.

Unit Connections

Details pipe diameter requirements and maximum length/height differences for unit connections.

Minimum Clearances

Outlines required space around the outdoor unit for proper airflow and installation.

Operating Limits

Defines the acceptable ambient temperature ranges for cooling and heating operations.

General Information and Site Selection

Provides general guidelines and site selection advice for installing the outdoor unit.

Installation Warnings to Avoid

Illustrates common installation mistakes and practices to avoid for system reliability.

Refrigerant Connections Procedures

Details procedures for flaring, connecting, and purging refrigerant lines, emphasizing R-410A safety.

Electrical Connections (Models 018-024)

Illustrates wiring diagrams for connecting outdoor and indoor units for specific models.

Electrical Connections (Models 028-048)

Illustrates wiring diagrams for connecting outdoor and indoor units for larger model sizes.

Electrical Data and Connections Summary

Provides a summary of electrical data, power input, and main power connection requirements.

Pump Down and Refrigerant Charge Management

Explains how to safely recover refrigerant and procedures for checking/charging the system.

Unit Maintenance

Outlines essential maintenance tasks, particularly coil cleaning, for qualified personnel.

Troubleshooting Common Issues

Lists common problems and their solutions for compressor, fan, and system operation.

Heat Pump Installation Supplement

Details special features like HPC, LRPS, and operating ranges for heat pump models.

Carrier 38YY-36G Specifications

General IconGeneral
BrandCarrier
Model38YY-36G
CategoryAir Conditioner
LanguageEnglish

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