Carrier 40SMC048N User Manual

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INSTALLATION MANUAL

Table of Contents

Questions and Answers:

C
Crystal RollinsAug 14, 2025
What to do if my Carrier 40SMC048N Air Conditioner compressor and fan of the outdoor unit will not start?
- H
  hsmithAug 14, 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.
P
patriciaburchAug 17, 2025
Why does my Carrier 40SMC048N compressor run continuously?
- J
  Johnny MckinneyAug 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.
B
beanstevenAug 21, 2025
What to do if my Carrier Air Conditioner discharge pressure is too high?
- R
  reyesshawnAug 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.
K
Kylie HicksAug 25, 2025
What to do if my Carrier 40SMC048N Air Conditioner compressor will not start, but outdoor fan is running?
- C
  Christopher HernandezAug 26, 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.
L
Laura GonzalezAug 29, 2025
What to do if my Carrier 40SMC048N has frequent ice build-up on outdoor coil during heating?
- K
  Kimberly GrossAug 29, 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.
E
Eileen JordanSep 1, 2025
What to do if my Carrier Air Conditioner compressor starts, but stops due to its overtemperature protection?
- M
  Michael HallSep 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.
M
Melissa EverettSep 4, 2025
What to do if my Carrier Air Conditioner discharge pressure is too low?
- K
  kevinkaiserSep 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
Kara StevensSep 8, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier 40SMC048N?
- M
  Margaret FisherSep 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 40SMC048N Specifications

General

Brand	Carrier
Model	40SMC048N
Category	Air Conditioner
Language	English

Summary

INSTALLATION MANUAL

Dimensions and weight

Connections

Details pipe diameter and length for unit connections.

Minimum clearances

General information

Unit installation

Instructions for installing the outdoor unit and site selection.

Choosing the installation site

Recommendations and points to avoid for optimal unit placement.

Warnings: avoid....

Refrigerant connections

Flaring the ends of the tubing

Procedures for preparing and flaring copper tubing ends.

Connection to unit

Guide for connecting refrigerant lines to the unit.

Tightening torque

Specifies torque values for refrigerant fittings to prevent leaks.

Air purging

Method for removing air from the refrigerant system.

Electrical connections for 018 to 024 size

Electrical connections for 028 to 048 size

Pump Down and check the refrigerant charge

Unit maintenance and troubleshooting

Unit maintenance

Procedures for cleaning coils and general maintenance.

Troubleshooting

Common issues and solutions for unit operation problems.

Installation instructions supplement

Condensing temperature controller: wiring diagram

Wiring diagram for the condensing temperature controller.

Condensing temperature controller operation

Explains how the condensing temperature controller functions.

Troubleshooting

Troubleshooting specific to the condensing temperature controller.

Temperature setting

Details on setting the proportional band and hard start time.

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