Carrier 42PHQ024P User Manual

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INSTALLATION MANUAL

Table of Contents

Questions and Answers:

C
Christina JohnsonAug 13, 2025
What to do if my Carrier Air Conditioner compressor and fan of the outdoor unit will not start?
- J
  Joshua JonesAug 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.
T
Tina HallAug 17, 2025
Why does my Carrier 42PHQ024P Air Conditioner compressor run continuously?
- W
  whitemicheleAug 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.
F
fsantanaAug 21, 2025
What to do if my Carrier 42PHQ024P discharge pressure is too high?
- K
  Kevin McgrathAug 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.
N
Natalie PittmanAug 25, 2025
What to do if my Carrier 42PHQ024P compressor will not start, but outdoor fan is running?
- M
  michaelgreenAug 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.
M
Mr. Steven MitchellAug 28, 2025
What to do if my Carrier 42PHQ024P Air Conditioner has frequent ice build-up on outdoor coil during heating?
- P
  Patricia CaseyAug 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
amandakellySep 1, 2025
What to do if my Carrier Air Conditioner compressor starts, but stops due to its overtemperature protection?
- S
  Sharon HowellSep 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.
R
Robert LeeSep 5, 2025
What to do if my Carrier 42PHQ024P Air Conditioner discharge pressure is too low?
- B
  Bryan Roberson DDSSep 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.
B
brian92Sep 8, 2025
What causes outdoor fan cycling due to its overtemperature protection in Carrier Air Conditioner?
- F
  fredrichardsSep 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 42PHQ024P Specifications

General

Brand	Carrier
Model	42PHQ024P
Category	Air Conditioner
Language	English

Summary

Installer and Service Technician Alert

R-410A Refrigerant Handling Guide

Crucial safety and operational guidelines for R-410A systems.

Unit Dimensions and Weight

Model-Specific Dimensions and Weight Data

Detailed physical dimensions and weight for various outdoor unit models.

Pipe Connection Specifications

Max Length, Height, and Pipe Diameters

Specifies maximum pipe length, height difference, and pipe diameters.

Minimum Installation Clearances

Clearance Requirements for Optimal Airflow

Required minimum clearances around the outdoor unit for proper installation.

Operating Limits and Conditions

Temperature Ranges and Voltage Limits

Defines acceptable operating temperature ranges and voltage limits for the unit.

General Installation Procedures

R-410A System Safety and Compliance

Guidelines for R-410A systems, safety, compliance, and installation warnings.

Installation Site Selection Criteria

Site Requirements and Installation Details

Guidelines for choosing a site and specific installation details like drainage.

Installation Warnings and Avoidances

Common Installation Mistakes to Prevent

Visual guide to common installation errors and precautions to prevent.

Refrigerant Connection Preparation

Tube Preparation and Handling Best Practices

Steps for preparing refrigerant connections, emphasizing cleanliness and proper tools.

Refrigerant Connection Execution

Flaring, Connecting, and Tightening Torque

Detailed steps for flaring tubing, connecting to the unit, and applying correct torques.

Refrigerant Connection Finalization

Purging Air, Leak Check, and Insulation

Procedures for purging air, conducting leak checks, and insulating pipes.

Electrical Connections (018-024 Size)

Wiring Diagrams for 018-024 Models

Wiring diagrams for cooling-only and heat pump models, including terminal legend.

Electrical Connections (028-048 Size)

Wiring Diagrams for 028-048 Models

Wiring diagrams for cooling-only and heat pump models, including terminal legend.

Electrical Connection Guidelines

Connection Procedures and Electrical Data

General electrical connection instructions and detailed electrical data.

Refrigerant Pump Down Procedure

Steps for Collecting System Refrigerant

Detailed steps for performing pump-down to collect refrigerant before disconnection.

Refrigerant Charge Verification

Checking Charge and Correct Charging Method

Procedure for checking refrigerant charge and the correct method for charging R-410A.

Outdoor Unit Maintenance

Coil Cleaning and Initial Energization

Instructions for cleaning the outdoor unit coil and initial energizing procedures.

Troubleshooting Common Issues

Diagnosing and Resolving Operational Problems

Guide to diagnosing and resolving common compressor, fan, and pressure-related issues.

Heat Pump Unit Specific Features

Protective Devices: HPC, HIP, LRPS

Details on heat pump specific features like HPC, HIP, and LRPS protective devices.

Condensing Temperature Controller

Controller Wiring, Operation, and Settings

Wiring diagram, operational modes, and temperature settings for the controller.

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