Carrier Infinity 25VNA436 - User Manual

Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
This marker indicates a change from prior revision.
Table of contents
PAGE NO. PAGE NO.
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Inverter Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 – Check Equipment and Job Site . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpack Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Inspect Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 2 – Install on a Solid, Level Mounting Pad . . . . . . . . . . . . . . . . . 3
Step 3 – Clearance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 4 – Operating Ambient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 5 – Elevate Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 6 – In Long-Line Applications, Install Liquid-Line Solenoid Valve
(LSV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 7 – 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
No Installation of Adapter Tube . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sweat Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Evacuate Refrigerant Tubing and Indoor Coil . . . . . . . . . . . . . . . 6
Deep Vacuum Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Final Tubing Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 8 – 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
Step 9 – Compressor Stator Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Airflow Setup for Infinity Control Furnace or FE Fan Coil (communi-
cating). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 10 – Install Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 11 – Start-Up & Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Follow these steps to properly start up the system: . . . . . . . . . . . 8
Step 12 – Heating Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 13 – Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Evacuation and Recovery of Refrigerant from within 25VNA . 11
Step 14 – 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
Table 3 – VFD LED Indicator Functions . . . . . . . . . . . . . . . . . . . . 14
Input Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Reactors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Variable Speed Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Time Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Heating Electronic Expansion Valve (EXV-H) . . . . . . . . . . . . . 15
Vapor Injection Electronic Expansion Valve (EXV-VI) . . . . . . 15
BLDC Inverter-Controlled Fan Motor . . . . . . . . . . . . . . . . . . . . 15
Pressure Equalization Valve (PEV) . . . . . . . . . . . . . . . . . . . . . . 15
High Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Outdoor Pressure Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Stator Heater Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Infinity Controlled low ambient cooling . . . . . . . . . . . . . . . . . . 15
Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Systems Communication Failure . . . . . . . . . . . . . . . . . . . . . . . . 16
Model Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 4 – Model Plug Information . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pressure Switch Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Compressor Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Line Voltage Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Forced Defrost Pins (J9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Temperature Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5 – Resistance Values versus Temperature . . . . . . . . . . . . . 16
Table 6 – ODT Resistance Values versus Temperatures . . . . . . . . 16
Outdoor Air Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Outdoor Coil Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Suction Thermistor (OST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Discharge Thermistor (ODT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Failed Thermistor Default Operation . . . . . . . . . . . . . . . . . . . . . 17
Variable Speed Compressor Winding Resistance . . . . . . . . . . . 17
Table 7 – Variable Speed Compressor Resistances
(winding resistance at 68°F? (20°F) . . . . . . . . . . . . . . . . . . . . . . . . 17
Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Status Code Recall Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Emergency Mode Connections with a Conventional Thermostat18
Table 8 – Fault Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 9 – Malfunction Lockout Durations . . . . . . . . . . . . . . . . . . . 21
FINAL CHECKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CARE AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
25VNA4
Infinity™ Variable Speed Heat Pump
with Greenspeed™ Intelligence
2 to 5 Nominal Tons

Carrier Infinity 25VNA436 Specifications

General

Brand	Carrier
Model	Infinity 25VNA436
Category	Heat Pump
Language	English

Summary

Safety and Installation Recommendations

General Safety Warnings

Essential safety precautions including explosion, electrical shock, and unit operation hazards.

Initial Installation Steps

Step 1 - Equipment and Job Site Check

Step 2 - Mounting Pad Installation

Technical Specifications

Table 1: Refrigerant Tube Diameters

Recommended liquid and vapor tube sizes for unit capacity.

Table 2: Accessory Usage Requirements

Required accessories for specific application types.

Refrigerant System Installation

Indoor Unit Connection and Filter Drier

Evacuation and Deep Vacuum Method

Procedures for evacuating the refrigerant system using a deep vacuum.

Electrical and Control Wiring

Step 8 - Electrical Connections

Detailed steps for making electrical connections.

Start-Up and Charging

Start-Up and Charging Safety

Critical safety precautions during system start-up and charging.

Charge Adjustment and UI Navigation

Using the User Interface for charge adjustment and system setup.

Refrigerant Charging Details

Subcooling and Weigh-in Methods

Procedures for charging using subcooling and weigh-in methods.

Line Set Data and Charging Mode Input

Heating Check Charge

Heating Charge Verification and Charts

Pumpdown and Evacuation

Pump Down Procedure via UI

Refrigerant Evacuation and EXV Control

System Functions and Components

Infinity UI and System Operation

Primary Control Module (PCM) Details

Troubleshooting and Diagnostics

Communication Failures, Model Plug, and Voltage

Thermistor Function and Identification

Status Codes and Emergency Mode

Status Codes and Recall Mode

Emergency Mode Thermostat Wiring

Fault Code Reference

Table 8: Fault Code Table

Comprehensive table of fault codes and their descriptions.

Fault Code Reference (Continued)

Table 8: Fault Code Table (Continued)

Continuation of the fault code table with additional codes.

Malfunction Lockout Durations

Table 9: Malfunction Lockout Durations

Table detailing malfunction lockout times.