Carrier Infinity 24VNA648 User Manual

Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
Table of contents
PAGE NO. PAGE NO.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inverter Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step1 – Check Equipment and Job Site . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpack Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Inspect Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step2 – Install on a Solid, Level Mounting Pad . . . . . . . . . . . . . . . . . . 3
Step3 – Clearance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step4 – Operating Ambient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step5 – Elevate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step6 – In Long-Line Applications, Install Liquid-Line Solenoid Valve
(LSV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step7 – Make Piping Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 1 – Refrigerant Connections and Recommended Liquid and Va-
por Tube Diameters (in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2 – Accessory Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Outdoor Unit Connected to Factory-Approved Indoor Unit . . . . 6
Install Liquid-Line Filter Drier Indoor . . . . . . . . . . . . . . . . . . . . . 6
Refrigerant Tubing connection Outdoor. . . . . . . . . . . . . . . . . . . . 6
Sweat Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evacuate Refrigerant Tubing and Indoor Coil . . . . . . . . . . . . . . . 6
Deep Vacuum Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Final Tubing Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step8 – Make Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Route Ground and Power Wires . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connect Ground and Power Wires . . . . . . . . . . . . . . . . . . . . . . . . 7
Connect Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Final Wiring Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step9 – Compressor Crankcase Heater. . . . . . . . . . . . . . . . . . . . . . . . . 7
Airflow Setup for Infinity Control Furnace or FE Fan Coil (communi-
cating). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step10 – Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step11 – Start-Up & Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Follow these steps to properly start up the system: . . . . . . . . . . . 8
Step12 – Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Evacuation and Recovery of Refrigerant from within 24VNA6 11
Step13 – System Functions and Major Components . . . . . . . . . . . . . 12
Primary Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Utility Interface With Infinity Control . . . . . . . . . . . . . . . . . . . . 12
Infinity Control, Green Communications (COMM) Light . . . . . 12
Amber Status Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5x7 LED Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
VFD Communications Light . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Bluetooth® Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Variable Frequency Drive (VFD) . . . . . . . . . . . . . . . . . . . . . . . . 14
Input Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reactors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Variable Speed Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Time Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Vapor Injection Electronic Expansion Valve (EXV-VI) . . . . . . 14
BLDC Inverter-Controlled Fan Motor . . . . . . . . . . . . . . . . . . . . 14
Pressure Equalization Valve (PEV) . . . . . . . . . . . . . . . . . . . . . . 14
High Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Outdoor Pressure Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Crankcase Heater Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Infinity Controlled low ambient cooling . . . . . . . . . . . . . . . . . . 15
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Systems Communication Failure . . . . . . . . . . . . . . . . . . . . . . . . 15
Model Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 3 – Model Plug Information . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pressure Switch Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Line Voltage Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Forced Defrost Pins (J9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Temperature Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 4 – Resistance Values versus Temperature . . . . . . . . . . . . . 15
Table 5 – ODT Resistance Values versus Temperatures . . . . . . . . 16
Outdoor Air Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Outdoor Coil Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Discharge Thermistor (ODT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Failed Thermistor Default Operation . . . . . . . . . . . . . . . . . . . . . 16
Variable Speed Compressor Winding Resistance . . . . . . . . . . . 16
Table 6 – Variable Speed Compressor Resistances
(winding resistance at 68°F? (20°F) . . . . . . . . . . . . . . . . . . . . . . . . 16
Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Status Code Recall Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Emergency Mode Connections with a Conventional Thermostat17
Table 7 – Fault Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 8 – Malfunction Lockout Durations . . . . . . . . . . . . . . . . . . . 21
FINAL CHECKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CARE AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
24VNA6
Infinity™ Variable Speed Air Conditioner
with Greenspeed™ Intelligence
2 to 5 Nominal Tons

Carrier Infinity 24VNA648 Specifications

General

Model Number	24VNA648
Type	Air Conditioner
Brand	Carrier
Series	Infinity
Refrigerant	R-410A
Stages	Variable
Voltage	208/230V
Phase	1
Cooling Capacity	48, 000 BTU/h
Heating Capacity	48000 BTU/h
Compressor Type	Variable Speed

Summary

Safety Information and Recommendations

General Safety Warnings

Covers explosion, electrical shock, high voltage, and general unit operation hazards.

Installation Best Practices

Guidance on unit placement, noise reduction, and installation environment.

Installation Steps and Site Preparation

Equipment Inspection and Unpacking

Procedures for checking the unit upon arrival and unpacking.

Mounting Pad Installation

Refrigerant Piping Connections

Electrical Connections and System Setup

Final Tubing and Electrical Checks

Electrical Wiring and Connections

Guidelines for routing and connecting power, ground, and control wiring.

Infinity Control Airflow Configuration

System Start-Up and Charging Procedures

Initial Start-Up and Safety Precautions

Steps for initial system start-up, emphasizing safety and environmental considerations.

Pumpdown and Refrigerant Evacuation

System Pumpdown Operation

Using the User Interface to isolate refrigerant within the outdoor unit.

Refrigerant Evacuation and Recovery Process

Procedures for evacuating the system, including EXV control for recovery.

Component Functions and Troubleshooting Guides

Thermistors and Default Operation Modes

Troubleshooting Communication and System Faults

Addresses communication failures, model plug issues, and common fault conditions.

Compressor Winding Resistance Diagnostics

Final Installation Checks and Ongoing Maintenance

Pre-Startup Installation Checklist

Essential checks before system operation, including wiring, valves, and documentation.

Periodic Maintenance Recommendations