IVT 12KHR-N Service Manual

SERVICE MANUAL
12KHR-N
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the
safety and performance of the set.
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
CHAPTER 1. SPECIFICATION
[1] SPECIFICATION............................................ 1-1
[2] EXTERNAL DIMENSION............................... 1-2
[3] WIRING DIAGRAM........................................ 1-3
[4] ELECTRICAL PARTS .................................... 1-3
CHAPTER 2. EXPLAMATION OF CIRCUIT AND OP-
ERATION
[1] BLOCK DIAGRAMS....................................... 2-1
[2] MICROCOMPUTER CONTROL SYSTEM........ 2-3
[3] FUNCTION .................................................... 2-9
CHAPTER 3. FUNCTION AND OPERATION OF PRO-
TECTIVE PROCEDURES
[1] PROTECTION DEVICE FUNCTIONS AND
OPERATIONS................................................ 3-1
[2] AIR TO AIR HEAT PUMP OPERATION IN
THERMISTOR ERROR ................................. 3-3
[3] THERMISTOR TEMPERATURE CHAR-
ACTERISTICS ............................................... 3-5
[4] HOW TO OPERATE THE OUTDOOR
UNIT INDEPENDENTLY ............................... 3-6
[5] GENERAL TROUBLESHOOTING CHART........ 3-6
[6] MALFUNCTION (PARTS) CHECK METH-
OD ................................................................. 3-8
[7] OUTDOOR UNIT CHECK METHOD .......... 3-10
[8] TROUBLESHOOTING GUIDE.................... 3-14
CHAPTER 4. REFRIGERATION CYCLE
[1] FLOW FOW REFRIGERANT........................ 4-1
[2] STANDARD CONDITION.............................. 4-1
[3] TEMPERATURE AT EACH PART AND
PRESSURE IN 3-WAY VALVE ...................... 4-1
[4] PERFORMANCE CURVES........................... 4-2
CHAPTER 5. DISASSEMBLING PROCEDURE
[1] DISASSEMBLY OF INDOOR UNIT............... 5-1
[2] DISASSEMBLY OF OUTDOOR UNIT......... 5-10
Parts Guide
TopPage
CONTENTS
SPLIT TYPE
12KHR-N
MODEL
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only
parts identical to those specified should be used.
AIR TO AIR HEAT PUMP

IVT 12KHR-N Specifications

General

Brand	IVT
Model	12KHR-N
Category	Heat Pump
Language	English

Summary

CHAPTER 1. SPECIFICATION

[1] SPECIFICATION

Detailed technical specifications including capacity, dimensions, and electrical data for indoor and outdoor units.

[3] WIRING DIAGRAM

Electrical schematics illustrating connections for indoor and outdoor units.

CHAPTER 3. FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES

[1] PROTECTION DEVICE FUNCTIONS AND OPERATIONS

Detailed table of protective functions, detection periods, and reset conditions.

[2] AIR TO AIR HEAT PUMP OPERATION IN THERMISTOR ERROR

2. Outdoor unit

[3] THERMISTOR TEMPERATURE CHARACTERISTICS

[5] GENERAL TROUBLESHOOTING CHART

A table listing common malfunctions and their remedies for the indoor unit.

[6] MALFUNCTION (PARTS) CHECK METHOD

Flowchart for diagnosing defective outdoor unit IPM/compressor.

2. Procedure for determining defective expansion valve

5. IPM check method

Detailed procedure for checking the IPM (Intelligent Power Module) for faults.

1. Checking procedures

2. Troubleshooting of outdoor unit electric components

3. Caution in checking printed circuit boards (PWB)

Important safety precautions when checking printed circuit boards.