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Carrier 38HDF - User Manual

Carrier 38HDF
38 pages
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Product Data
40KMC / 38HDF
40KMQ / 38QRF
I n --- C e i l i n g C a s s e t t e D u c t --- F r e e S p l i t S y s t e m
Sizes 018 to 036
The ideal compliment to your ducted system when it is impractical
or prohibitively expensive to use ductwork.
INDUSTRY LEADING
FEATURES / BENEFITS
AN INEXPENSIVE AND CREATIVE
SOLUTION TO DESIGN PROBLEMS.
The 38HDF(QRF) / 40KMC (KMQ) series duct--free split systems
are a matched combination of an outdoor condensing unit and an
indoor fan coil unit connected only by refrigerant tubing and wires.
The in--ceiling cassette fan coils are ideal for retrofit or
modernization projects where a false ceiling is available. This
selection of fan coils permits inexpensive and creative solutions to
design problems such as:
S Add--ons to current space where the existing system
cannot handle the load.
S Special space requirements. like a conference room,
where the load varies.
These compact in--ceiling cassette units require less than 12 inches
(304.8 mm) of false ceiling space and the only part that is seen is
an aesthetically pleasing grille that blends with most decor.

Table of Contents

Other manuals for Carrier 38HDF

Preview: Installation Instructions
Installation Instructions28 pages

Questions and Answers

  • J
    Jessica BlakeAug 3, 2025
    How to troubleshoot Carrier Air Conditioner compressor and fan not starting?
    • S
      smurrayAug 3, 2025
      If the compressor and fan of your Carrier Air Conditioner's outdoor unit won't start, first, ensure the unit is energized by checking the main power connection. Then, verify that the main switch is in the ON position and that the main switch fuses are not blown; replace them if necessary. If the compressor cycling protection is active, wait for 3 minutes. Also, check that the main power voltage is correct and that all electrical connections are secure and properly connected.
  • N
    Nichole EvansAug 7, 2025
    Why does my Carrier 38HDF Air Conditioner compressor keep running?
    • C
      Christine ColeAug 8, 2025
      If the compressor in your Carrier Air Conditioner runs continuously, it could be due to several reasons. First, check if the indoor temperature setting is too low or too high. A faulty outdoor unit fan could also be the cause, requiring replacement. Additionally, obstructions at the air intake or dirty indoor unit filters can lead to this issue; remove any obstructions and clean the filter. In some cases, the unit may be too small for the application requirements, and you should contact a qualified service technician for a system evaluation. Air or other non-condensable gasses in the circuit can also cause this issue, requiring you to drain refrigerant, evacuate and recharge the system.
  • A
    Alejandro GillAug 12, 2025
    What to do if Carrier Air Conditioner discharge pressure is too high?
    • J
      Joseph CastroAug 12, 2025
      If the discharge pressure of your Carrier Air Conditioner is too high, it could be due to a dirty or obstructed outdoor coil; clean or remove any obstructions. A faulty condenser fan can also cause this issue, requiring replacement. Additionally, an incorrect indoor temperature setting could be the problem, so check and adjust it as needed. Air or other non-condensable gasses in the circuit might also be the cause, necessitating draining the refrigerant, evacuating, and recharging the system.
  • C
    Christopher AtkinsonAug 16, 2025
    Why is the suction pressure too low on my Carrier 38HDF?
    • J
      justinriosAug 16, 2025
      If the suction pressure of your Carrier Air Conditioner is too low, first check the indoor temperature setting to ensure it is appropriately adjusted. The issue might also stem from an evaporator coil covered with ice, indicating insufficient air circulation that needs checking and repair. Additionally, a clogged expansion device or suction line could be responsible, requiring inspection and repair. Inspect the electrical parts to ensure the outdoor fan stops during defrost periods.
  • O
    Omar LiAug 20, 2025
    What causes low discharge pressure in Carrier Air Conditioner?
    • K
      Kathy OrozcoAug 20, 2025
      If the discharge pressure of your Carrier Air Conditioner is too low, check the indoor temperature setting. It might be set too high or too low. Also, make sure the outdoor coil isn't dirty or obstructed; clean it if necessary. A dirty indoor unit air filter can also cause this issue; clean the filter to resolve it.
  • R
    Robert ReyesAug 29, 2025
    What causes high suction pressure in Carrier 38HDF?
    • C
      Christopher WellsAug 29, 2025
      If the suction pressure of your Carrier Air Conditioner is too high, first check the indoor temperature setting. It might be set too high or too low. A faulty reversing valve or an internal leak could also be the cause, requiring replacement of the reversing valve.
  • J
    Jackie PierceNov 23, 2025
    Why does my Carrier 38HDF Air Conditioner compressor stop due to over-temperature?
    • A
      April KnightNov 23, 2025
      If your Carrier Air Conditioner's compressor stops due to over-temperature, it could be due to several reasons. The compressor might be burnt out, seized, or the protection device may be activated; check for the cause and replace the compressor if needed. An incorrect refrigerant charge (either excessive or low), or the presence of air or other non-condensable gasses in the circuit can also cause this; in such cases, drain the refrigerant, evacuate, and recharge the system. Ensure that you do not vent refrigerant to the atmosphere and use refrigerant recovery equipment. Also, check if the main voltage is too high or too low and adjust it if necessary. Inspect the condenser coil for obstructions and remove them. If the outdoor fan is off, determine the cause and resume operation or repair i...

Summary

Product Data

Industry Leading Features; Benefits

Highlights the key advantages and benefits of the duct-free split system for design solutions.

An Inexpensive and Creative Solution to Design Problems

Addresses how the system provides cost-effective solutions for challenging space requirements.

Industry Leading Features and Benefits

Low Sound Levels

Details the quiet operation of the in-ceiling cassette units, ideal for noise-sensitive environments.

Secure Operation

Explains how the system prevents intruders from accessing the indoor unit through ductwork.

Fast Installation

Highlights the ease and speed of installing both indoor and outdoor units, minimizing disruption.

Simple Servicing and Maintenance

Describes the straightforward procedures for accessing and maintaining indoor and outdoor units.

Built-in Reliability

Outlines the protective features and components ensuring years of trouble-free operation.

Individual Room Comfort

Focuses on features that enhance occupant comfort, like motorized louvers and optimized airflow.

Economical Operation

Explains the energy savings achieved through individual room control and efficient air distribution.

Easy-to-Use Controls

Details the user interface options, including wireless remote and wired controllers for comfort and efficiency.

Flexibility

Mentions how accessories simplify installation and meet various system requirements.

Agency Listings

Lists certifications like AHRI and UL, ensuring compliance and quality standards.

Model Number Nomenclature

AHRI* Capacity Ratings

Presents detailed cooling and heating capacity ratings for various system configurations.

Standard Features and Accessories

Indoor Unit Accessories

Details accessories specifically designed for the indoor cassette units, like grilles and kits.

Outdoor Unit Accessories

Outdoor Unit Dimensions

Outdoor Unit Clearances

Specifies the required clearances around the outdoor unit for proper airflow and installation.

Indoor Unit Dimensions

Physical Data - Outdoor Unit 38 HDF

Physical Data (Cont.) - Outdoor Unit 38 QRF

Physical Data (Cont.) - Indoor Unit 40 KMC

Physical Data (Cont.) - Indoor Unit 40 KMQ

Performance Data

Application Data

Unit Selection

Guidelines for choosing the appropriate unit size based on load requirements and system performance.

Unit Mounting (Indoor)

Instructions and considerations for installing the indoor in-ceiling cassette units correctly.

Unit Mounting (Outdoor)

Guidance on proper installation and clearance requirements for the outdoor condensing units.

Systems Operating Conditions

Details the operating ranges for cooling and heating under various conditions.

Low Ambient Operation

Information on operating the system at low ambient temperatures, including necessary accessories.

Refrigerant Lines

Specifications and recommendations for refrigerant line sizing, insulation, and installation.

Long Line Applications

Details on requirements and accessories for systems with extended refrigerant line lengths.

Control System

User Interface

Describes the options for controlling the unit, including wireless and wired controllers.

Electric Heat

Details the function and operation of the electric heater as a supplementary heating source.

Air Distribution

Information on the unit's air discharge capabilities and options for adjacent room cooling.

Outside Air and Air Discharge

Air Throw Data

Provides data on airflow distances based on the number of louvers open.

Sound Ratings

Presents sound power and sound pressure levels for outdoor and indoor units.

Electrical Data

Guide Specifications - In-Ceiling Cassette Duct-Free Units

Part 1 - General

Details system description, agency listings, delivery, storage, handling, and warranty information.

Part 2 - Products

Specifies equipment requirements, including general unit, cabinet, fans, coil, motors, controls, filters, and electric heat.

Guide Specifications - Horiz. Discharge Outdoor Units

Part 1 - General

Covers system description, agency listings, delivery, storage, handling, and warranty.

Part 2 - Products

Details equipment requirements like general unit, cabinet, fans, compressor, coil, refrigeration, controls, and electrical.

Carrier 38HDF Specifications

General IconGeneral
BrandCarrier
Model38HDF
CategoryAir Conditioner
LanguageEnglish

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