Carrier 40SMC024N User Manual

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INSTALLATION MANUAL

Table of Contents

Questions and Answers:

R
rachel71Aug 12, 2025
What to do if my Carrier 40SMC024N compressor and fan of the outdoor unit will not start?
- A
  Andrew HillAug 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.
E
Eric WilliamsonAug 16, 2025
Why does my Carrier 40SMC024N Air Conditioner compressor run continuously?
- T
  Tyler PerezAug 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.
C
carolinejensenAug 19, 2025
What to do if my Carrier Air Conditioner discharge pressure is too high?
- J
  jenniferallenAug 20, 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.
M
Michael MarquezAug 23, 2025
What to do if my Carrier Air Conditioner compressor will not start, but outdoor fan is running?
- M
  Michele WilsonAug 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.
R
Rebecca SampsonAug 27, 2025
What to do if my Carrier Air Conditioner has frequent ice build-up on outdoor coil during heating?
- R
  Rebecca MartinezAug 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.
J
johnstonmaryAug 31, 2025
What to do if my Carrier 40SMC024N Air Conditioner compressor starts, but stops due to its overtemperature protection?
- D
  davisjamesAug 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.
K
Katherine AlexanderSep 3, 2025
What to do if my Carrier 40SMC024N discharge pressure is too low?
- G
  George RhodesSep 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.
M
Morgan WilliamsSep 7, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier Air Conditioner?
- T
  Tamara MartinSep 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 40SMC024N Specifications

General

Brand	Carrier
Model	40SMC024N
Category	Air Conditioner
Language	English

Summary

Dimensions and Weight

Connections

Minimum Clearances

Operating Limits

General Information

Unit Installation Procedures

Details on the procedures for installing the outdoor unit of a residential split system.

Choosing the Installation Site

Guidance on selecting an optimal location, including recommendations and points to avoid.

Warnings: Avoidance of Errors

Refrigerant Connections

Flaring the Ends of the Tubing

Step-by-step guide on properly flaring copper tube ends for refrigerant connections.

Connecting to the Unit

Instructions for connecting refrigerant lines to the unit, including tightening torque.

Tightening Torque Specifications

Specifications for the correct torque values when tightening refrigerant fittings.

Air Purging Procedure

Procedure for purging air from the refrigerant piping using a vacuum pump.

Electrical Connections for 018 to 024 Size

Cooling Only Unit and System Wiring

Wiring diagrams for cooling-only outdoor units and systems.

Heat Pump Unit and System Wiring

Wiring diagrams for heat pump outdoor units and systems.

Terminal Box Legend

Explanation of terminal box symbols and connections for electrical wiring.

Electrical Connections for 028 to 048 Size

Cooling Only Unit and System Wiring

Wiring diagrams for cooling-only outdoor units and systems for larger models.

Heat Pump Unit and System Wiring

Wiring diagrams for heat pump outdoor units and systems for larger models.

Terminal Box Legend

Explanation of terminal box symbols for larger models.

Pump Down and Refrigerant Charge

Pump-down Procedure

Operation to collect all system refrigerant in the outdoor unit before disconnection.

Checking Refrigerant Charge

Method for verifying and correctly charging the system refrigerant.

Unit Maintenance and Troubleshooting

Unit Maintenance

Covers general maintenance and coil cleaning procedures for the outdoor unit.

Troubleshooting Common Issues

Diagnosing and resolving common issues with the compressor, fan, and system operation.

Installation Instructions Supplement

Heat Pump Unit Features and Diagrams

Details on specific features like HPC, LRPS, and diagrams for heat pump units.

Operating Range

Specifies the acceptable operating temperature limits for the unit.

Condensing Temperature Controller

Wiring diagram, operation, and temperature settings for the condensing temperature controller.

Troubleshooting Special Features

Troubleshooting notes specific to the condensing temperature controller and initial start-up.

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