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Carrier 42NQV025H User Manual

Carrier 42NQV025H
115 pages
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R410A
FILE NO. SVM-07013-1
SERVICE MANUAL
SPLIT TYPE
Indoor Unit Outdoor Unit
<High Wall, Heat Pump Type> <Heat Pump Type>
42NQV025H 38NYV025H
42NQV035H 38NYV035H
42NQV035M 38NYV035M
42NQV045H
38NYV045H
42NQV045M
38NYV045M
Revised May, 2007

Table of Contents

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Carrier 42NQV025H Specifications

General IconGeneral
RefrigerantR-410A
Heating Capacity2.8 kW
Energy Efficiency Ratio (EER)3.21
Outdoor Unit Dimensions (LxWxH)780 x 540 x 250 mm
Power Supply220-240V, 50Hz
HSPF RatingNot available
Outdoor Unit Dimensions (H x W x D)540 x 780 x 250 mm

Summary

Specifications

2.1 Specification

Details unit specifications including capacity, power, and noise levels.

2-2. Operation Characteristic Curve

Graphs showing operational characteristics based on compressor speed and temperature.

2-3. Capacity Variation Ratio According to Temperature

Charts illustrating how capacity changes with outdoor temperature.

Refrigerant R410A

3-1. Safety During Installation/Servicing

Precautions for safe installation and servicing procedures for R410A.

3-2. Refrigerant Piping Installation

Guidelines for installing refrigerant piping, including materials and joints.

3-3. Tools

Lists required and general tools for R410A installation and servicing.

3-4. Recharging of Refrigerant

Step-by-step procedure for recharging refrigerant, including safety precautions.

3-5. Brazing of Pipes

Details on materials and procedures for brazing pipes, including flux usage.

Construction Views

4-1. Indoor Unit

Dimensional drawings and installation details for the indoor unit.

4-2. Outdoor Unit

Dimensional drawings and installation details for the outdoor unit.

Specifications of Electrical Parts

6-1. Indoor Unit

Lists electrical parts and their specifications for the indoor unit.

6-2. Outdoor Unit

Lists electrical parts and their specifications for the outdoor unit.

Refrigerant Cycle Diagram

7-1. Refrigerant Cycle Diagram

Diagram illustrating the refrigerant flow for cooling and heating operations.

7-2. Operation Data

Table showing operational data for cooling and heating conditions.

Control Block Diagram

8-1. Indoor Unit

Block diagram illustrating the control functions of the indoor unit and remote controller.

8-2. Outdoor Unit

Block diagram illustrating the control functions of the outdoor unit.

Operation Description

9-2. Operation Description

Details various operation modes like basic, cooling, heating, auto, and dry.

9-3. Auto Restart Function

Describes how to set and use the auto restart feature after power failure.

9-4. 7-Segment Function

Explains the display of room and set temperatures on the 7-segment display.

9-5. Remote Controller and Its Functions

Covers the functions and operations of the remote controller.

Installation Procedure

10-1. Installation Diagram of Indoor and Outdoor Units

Diagrams showing the layout for installing indoor and outdoor units.

10-2. Optional Parts, Accessories and Tools

Lists optional parts, accessories, and tools required for installation.

10-3. Indoor Unit

Instructions for installing the indoor unit, including placement and drilling.

10-4. Outdoor Unit

Guidelines for installing the outdoor unit, including placement and refrigerant addition.

How to Diagnose the Trouble

11-1. First Confirmation

Initial checks for power supply and voltage to confirm basic operation.

11-2. Primary Judgment

Methods for initial diagnosis using LED indicators, remote controller, and symptoms.

11-3. Judgment by Flashing LED of Indoor Unit

Interpreting LED flash codes for self-diagnosis of indoor unit issues.

11-4. Self-Diagnosis by Remote Controller (Check Code)

Using the remote controller in service mode to retrieve check codes for diagnosis.

11-5. Judgment of Trouble by Every Symptom

Troubleshooting common symptoms like no power or fan issues.

11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)

Diagnosing problems related to wiring between indoor and outdoor units.

11-6. Check Code 1C (Miswiring in indoor/outdoor units) and 1E

Troubleshooting specific error codes related to miswiring and gas leaks.

11-7. How to Diagnose Trouble in Outdoor Unit

Procedures for diagnosing issues within the outdoor unit's inverter assembly.

11-8. How to Check Simply the Main Parts

Methods for checking main components like the P.C. board.

11-10. How to Simply Judge Whether Outdoor Fan Motor is Good or Bad

Steps to diagnose the condition of the outdoor fan motor.

How to Replace the Main Parts

12-1. Indoor Unit

Procedures for disassembling and replacing parts of the indoor unit.

12-2. Microcomputer

Steps to access and replace the microcomputer on the indoor unit's P.C. board.

12-2. Outdoor Unit

Procedures for detaching and attaching parts of the outdoor unit.

Exploded Views and Parts List

13-1. Indoor Unit (1)

Exploded view and parts list for the indoor unit.

13-2. Indoor Unit (E-Parts Assy)

Exploded view and parts list for indoor unit electronic parts assembly.

13-3. Outdoor Unit

Exploded views of the outdoor unit with part identification.

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