Carrier Infinity 24VNA6 Series - User Manual

Service Manual
Table of contents
PAGE NO. PAGE NO.
UNIT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Aluminum Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ELECTRICAL SYSTEM OVERVIEW . . . . . . . . . . . . . . . . . . . . 3
Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Compressor / Fan Sub-System . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Variable Frequency Drive (VFD) . . . . . . . . . . . . . . . . . . . . . . . . 5
VFD Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Reactors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
High Pressure Switch (HPS). . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Compressor Brushless Permanent Magnet Motor (BPM) . . . . . 5
VFD + Compressor BPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fan Brushless Permanent Magnet Motor (BPM) . . . . . . . . . . . . 5
VFD + Fan BPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CONTROL SUB-SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Primary Control Module (PCM). . . . . . . . . . . . . . . . . . . . . . . . . 5
Control Connection (Communicating and Non-Communicating). 6
Communicating Infinity Control . . . . . . . . . . . . . . . . . . . . . . . . 6
Non-Communicating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 1 – DIP Swtich Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PCM Indicators and Matrix Display . . . . . . . . . . . . . . . . . . . . . . 6
Model Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pressure Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VFD Control Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pressure Equalization Valve (PEV) . . . . . . . . . . . . . . . . . . . . . . 8
Reversing Valve (RVS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Heating Electronic Expansion Valve (EXV-H) . . . . . . . . . . . . . 8
Bluetooth® Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Accessory Control Components. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Utility Curtailment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Liquid Line Solenoid Valve (LLS) . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROL FEATURES AND OPERATION . . . . . . . . . . . . . . . . . . 9
Equipment Configuration (Model Plug) . . . . . . . . . . . . . . . . . . . . 9
Performance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compressor Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compressor Protect Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Running. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Compressor Reliability Protection . . . . . . . . . . . . . . . . . . . . . . . 9
Sump Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Intermittent Low Fan Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Fan Operating Exceptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Super Heat Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Defrost Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Defrost Interval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Defrost Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PCM Indicators and Display Operation. . . . . . . . . . . . . . . . . . . . 10
Status Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Comm Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
VFD Comm Light. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Matrix Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Reprogrammability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
VFD LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2 – VFD LED Indicator Functions . . . . . . . . . . . . . . . . . . 11
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TROUBLESHOOTING CONTROL FEATURES . . . . . . . . . . . 12
SYSTEM DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 3 – Model Plug Information. . . . . . . . . . . . . . . . . . . . . . . . 13
COMPONENT DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4 – Variable Speed Compressor Resistances (ohm)
(winding resistance at 68°F /20°C) . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5 – DC Voltage and PWM Measurement . . . . . . . . . . . . . 14
Table 6 – Thermistor Resistance (k-ohms) vs. Temperature. . . . 14
DIAGNOSTIC CODES AND TROUBLESHOOTING . . . . . . . 17
Table 7 – Fault Code Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REFRIGERATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Servicing Systems on Roofs With Synthetic Materials. . . . . . . . 35
Synthetic Roof Precautionary Procedure . . . . . . . . . . . . . . . . . 35
Brazing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service Valves and Pumpdown . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Pumpdown & Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Pump Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Evacuation and Recovery of Refrigerant from 25VNA4 . . . . . 36
Reversing Valve (25VNA4) . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Install Liquid-line Filter Drier Indoor. . . . . . . . . . . . . . . . . . . . 37
Suction Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Thermostatic Expansion Valve (TXV) . . . . . . . . . . . . . . . . . . . . 37
TXV Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Accumulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Vapor Injection Operation (5 Ton Models) . . . . . . . . . . . . . . . . . 38
Vapor Injection Electronic Exp. Valve (EXV VI)
(5 Ton Models) . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 39
REFRIGERATION SYSTEM REPAIR. . . . . . . . . . . . . . . . . . . . . . 39
Leak Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Coil Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
24VNA6 / 25VNA4
Infinity® Series
Variable Speed Air conditioner and Heat Pump
with Greenspeed Intelligence
2 to 5 Nominal Tons

Carrier Infinity 24VNA6 Series Specifications

General

Brand	Carrier
Model	Infinity 24VNA6 Series
Category	Heat Pump
Language	English

Summary

UNIT IDENTIFICATION

Model Number Nomenclature

Details the structure and meaning of model number components.

Serial Number Nomenclature

Explains the format and components of the unit's serial number.

SAFETY CONSIDERATIONS

Electrical Safety Warnings

Covers warnings for electrical shock and high voltage hazards.

General Hazard Warnings

Includes warnings for cut hazards and general operational safety.

ELECTRICAL SYSTEM

Aluminum Wire Usage

Guidelines for using aluminum wire in branch circuits and unit connections.

Electrical System Overview

Describes the main components of the electrical system and their overview.

Variable Frequency Drive (VFD) System

Details the VFD system, its components, and function for compressor/fan control.

CONTROL SUB-SYSTEM

Primary Control Module (PCM)

Explains the PCM as the central control unit, its sensors, and actuators.

CONTROL CONNECTIONS AND INDICATORS

Communicating and Non-Communicating Wiring

Details wiring and operation for both communicating and non-communicating control setups.

PCM Indicators and Display

Describes the function and interpretation of the PCM's LEDs and matrix display.

CONTROL FEATURES AND OPERATION

Equipment Configuration and Modes

How the PCM uses the model plug, and details performance, efficiency, and comfort modes.

Compressor and Fan Operation

Covers compressor startup, running, protection, and fan operation, including exceptions.

Heating, Cooling, and Defrost Control

Explains operating temperature ranges, control logic, and defrost mode for heat pump operation.

TROUBLESHOOTING AND DIAGNOSTICS

Troubleshooting Control Features

Covers diagnostics display, forced defrost input, and diagnostic code recall.

System Diagnostics and Power Distribution

Focuses on 24VAC power distribution and related cautions for diagnostics.

COMPONENT DIAGNOSTICS

Compressor Diagnostics

Methods for testing compressor motor windings and phase resistances.

Thermistor Diagnostics

Procedures for checking OAT, OCT, OST, and ODT thermistors for faults.

Pressure Sensor Diagnostics

Explains how to check pressure transducers for accuracy and potential issues.

REFRIGERATION SYSTEM

Refrigerant and Oil Handling

Safety precautions for handling Puronr refrigerant and PVE compressor oil.

Brazing and Service Valves

Basic brazing techniques and procedures for servicing unit's service valves.

Pumpdown, Evacuation, and Reversing Valve

Procedures for refrigerant isolation, evacuation, and reversing valve function.

Expansion Valves, Filter Driers, and Accumulators

Details on TXV, EXV, filter driers, and accumulator function and replacement.

Vapor Injection and System Repair

Explains vapor injection operation and general refrigeration system repair like leak detection.