Haier AB18SC2VHA User Manual

Ductless Multi-Split Heat Pump
Service Manual
Design may vary by model number.
• Please read this manual before using the heat pump.
• Keep this user manual for future reference.
Table of Contents
Introduction ............................................................................................................... A-1
Outdoor Technical Overview ...................................................................................... B-1
Wall Mount Technical Overview ..................................................................................C-1
Compact Cassette Technical Overview ......................................................................D-1
Large Cassette Technical Overview ............................................................................ E-1
Slim Duct Technical Overview .................................................................................... F-1
Mid-Static Ducted Technical Overview .......................................................................G-1
Medium Static Ducted (Pro Series) Technical Overview ..............................................H-1
Console Technical Overview ........................................................................................ I-1
Troubleshooting & Reference ..................................................................................... J-1
Outdoor
2U18MS2VHB
3U24MS2VHB
4U36MS2VHB
Indoor
Wall Mount - Highwall
AW07LC2VHB
AW09LC2VHB
AW12LC2VHB
AW18LC2VHB
AW24LP2VHA
2’x2’ Compact Cassette
AB09SC2VHA
AB12SC2VHA
AB18SC2VHA
3’x3’ Large Cassette
AL24LP2VHA
Slim Duct
AD07SL2VHB
AD09SL2VHB
AD12SL2VHB
AD18SL2VHB
Mid-Static Ducted
USYM09UCDSA
USYM12UCDSA
USYM18UCDSA
USYM24UCDSA
Medium Static Ducted
AM24LP2VHA
Console
USYF09UCDWA
USYF12UCDWA
USYF18UCDWA
• Before troubleshooting or servicing equipment, review equipment installation guides
and conrm ALL installation requirements & specications have been met. Including,
but not limited to: wiring, clearance, ducting (where applicable), power, and line set
requirements. Correct any installation issues before continuing.

Haier AB18SC2VHA Specifications

General

Refrigerant	R410A
Voltage	220-240V
Phase	1
Cooling Capacity	18000 BTU
Weight (Indoor/Outdoor)	35 kg

Summary

INTRODUCTION

Safety & Precautions

Crucial safety guidelines and warnings for proper installation and usage of the heat pump system.

Specifications

Technical details and performance data for various outdoor and indoor unit types.

Functions and Control

Explanation of operating modes, control features, and system logic.

OUTDOOR TECHNICAL OVERVIEW

Components

Detailed breakdown of the outdoor unit's internal parts and their functions.

Operations

Description of system sequences for cooling, heating, and defrost modes.

Testing Procedures

Guidance on testing individual components like fan motors and sensors.

Error Codes

List of error codes and their corresponding diagnoses for outdoor units.

WALL MOUNT TECHNICAL OVERVIEW

Components

Identification and description of internal components within the wall mount indoor unit.

Testing Procedures

Steps for testing indoor unit fan motors, sensors, and communication circuits.

COMPACT CASSETTE TECHNICAL OVERVIEW

Components

Overview of internal parts for the compact cassette indoor unit.

TROUBLESHOOTING & REFERENCES

Special Functions

Explanation of special operational features like Auto Restart and Forced Defrost.

Master Error Code Chart

Comprehensive chart correlating error codes across different unit types.

Outdoor Unit Error Codes

Detailed list and explanation of outdoor unit specific error codes.

Pressure-Related Error Codes

Troubleshooting guide for errors related to system pressure switches.

Communication Error Code

Information on diagnosing communication failures between units.