Carrier 25HNA6 - User Manual

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to the Expert£
Installation Instruction
NOTE: Read the entire instruction manual before starting the
installation.
Unless otherwise noted, information in these installation
instructions pertain to both 25HNA6 and 25HNA9 series units.
Information that is unique to the 25HNA6 series will be identified
as such; likewise information that is unique to the 25HNA9 series
will also be identified.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal iniury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol/_
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal iniury. Understand
these signal words: DANGER, WARNING, and CAUTION. These
words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal iniury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which may result in minor personal iniury or product and
property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
Indoor Thermostat Control Options
Standard
Model Infinity
Control 2-stage
Thermostat
25HNA6 Yes Yes
No
25HNA9 Yes (Emergency
Mode Only)
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch nmst be in the OFF position
and install a lockout tag. There may be more than 1
disconnect switch. Lock out and tag switch with a
suitable warning label.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal iniury
or equipment damage.
Puron® refrigerant systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment
or components on Puron® refrigerant equipment.

Summary

SAFETY CONSIDERATIONS

Electrical Shock Hazard

Warning about potential personal injury or death from electrical shock.

Unit Operation and Safety Hazard

Warning about potential personal injury or equipment damage from improper operation.

Make Piping Connections

Refrigerant Tubing and Evacuation

Filter Drier and Tubing Connections

Deep Vacuum Evacuation

Procedure for evacuating the refrigerant system to 500 microns.

Electrical Connections

Wiring and Airflow Configuration

Power and Control Wiring

System Start-Up and Operation

System Startup Procedure

Step-by-step guide for initiating system operation after installation.

Cooling and Heating Sequence

System Operation Details

Compressor and Fan Operation

General Information and Defrost

Low Ambient Cooling

Defrost Control and Hold

Advanced Features and Components

Refrigerant Charge Check

Detailed procedure for checking and adjusting the system's refrigerant charge.

Troubleshooting System Issues

Communication, Model Plug, and Pressure Switches

Diagnosing communication failures, model plug issues, and pressure switch trips.

Control Faults, Voltage, and Contactor Issues

Addressing control board faults, voltage problems, and contactor errors.

Compressor Thermal Cutout

Explains thermal protection and lockout for compressors.

Troubleshooting Specific Operations

Contactor Failures and Start Detection

Stage Switching and Unloader Tests

Troubleshooting stage switching and performing unloader tests.

Thermistor Operation and Testing

Thermistor Failure and Compressor Data

Thermistor Failure Defaults

Status Codes and Troubleshooting Guide

Amber LED Flash Codes

Troubleshooting Fault Code Table

Final Installation Checks and Maintenance

Final Job Site Checks

Puron Refrigerant Handling Guide

Quick reference for safe servicing of Puron® (R-410A) refrigerant systems.

Carrier 25HNA6 Specifications

General

Brand	Carrier
Model	25HNA6
Category	Air Conditioner
Language	English