Carrier 40SMC028N User Manual

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INSTALLATION MANUAL

Table of Contents

Questions and Answers:

P
poolelisaAug 13, 2025
What to do if my Carrier Air Conditioner compressor and fan of the outdoor unit will not start?
- C
  Courtney MoralesAug 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
Bonnie WintersAug 16, 2025
Why does my Carrier Air Conditioner compressor run continuously?
- J
  Joan HarrisAug 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.
J
jonathan65Aug 20, 2025
What to do if my Carrier 40SMC028N Air Conditioner discharge pressure is too high?
- R
  Rachel MercerAug 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.
W
Wayne HickmanAug 25, 2025
What to do if my Carrier 40SMC028N Air Conditioner compressor will not start, but outdoor fan is running?
- K
  Kerry MooreAug 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.
C
Christina VillarrealAug 27, 2025
What to do if my Carrier 40SMC028N Air Conditioner has frequent ice build-up on outdoor coil during heating?
- E
  erin89Aug 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.
B
Benjamin HartAug 31, 2025
What to do if my Carrier 40SMC028N Air Conditioner compressor starts, but stops due to its overtemperature protection?
- R
  Roberto ParrishAug 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.
J
Jacob HerreraSep 4, 2025
What to do if my Carrier Air Conditioner discharge pressure is too low?
- A
  amandaleeSep 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.
K
Kathleen KimSep 8, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier 40SMC028N Air Conditioner?
- M
  Melissa GuzmanSep 8, 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 40SMC028N Specifications

General

Brand	Carrier
Model	40SMC028N
Category	Air Conditioner
Language	English

Summary

Dimensions and Weight

Connections

Minimum Clearances

Operating Limits

General Information

Unit Installation Procedures

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

Choosing the Installation Site

Provides guidance on selecting an appropriate location for the unit.

Safety Warnings

Refrigerant Connections

Electrical Connections for 018 to 024 Size

Electrical Connections for 028 to 048 Size

Electrical Data

Pump Down and Refrigerant Charge

Unit Maintenance and Troubleshooting

Installation Instructions Supplement

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