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Haier MRV II - User Manual

Haier MRV II
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Haier MRVⅡ Air Conditioning
Haier MRVⅡ can be used in a large combination
with multiple outdoor units, it is only one system
and is the second generation of Haier C-MRV
product. Major features are energy saving,
intelligent control and precise temperature control,
for R410A system, that is more friendly for
environment as well.
To regulate the installation, commissioning and
maintenance procedure, and ensure the working
quality, also to improve the working efficiency, we
make this guide for reference.
This regulation is applicable for Haier A/C Elec.
Corp. Ltd.

Table of Contents

Questions and Answers

  • J
    Joshua PeckAug 1, 2025
    Why is my Haier Air Conditioner indoor unit not cooling properly?
    • J
      jason52Aug 1, 2025
      If your Haier Air Conditioner's indoor unit isn't cooling well, check the position and resistance value of the indoor gas pipe TC1 (three core, green) and liquid pipe TC2 (three core, black) sensors. They may be inserted conversely, pushed off, or have the wrong resistance value (temp. 25, TC1/TC2 should be 10KΩ). Also, the evaporator might be blocked by weld or dirt; in this case, collect the refrigerant and charge nitrogen to check and clean any obstructions. The phase sequence of EEV could also be reversed; try changing SW08-7 to OFF.
  • F
    Frank WilsonAug 9, 2025
    What to do if Haier MRV II wired controller does not display?
    • A
      andrew03Aug 9, 2025
      If your Haier Air Conditioner wired controller doesn't display anything, ensure that CN23 on the PCB is short-connected. Also, check if the communication wire of the wired controller from CN22 to the terminal is inserted correctly. Finally, verify that SW08-[6] is set to 'ON'; if it's 'OFF', change it to 'ON'.
  • C
    Catherine ChaseAug 17, 2025
    Why is my Haier MRV II outdoor unit not heating properly?
    • W
      wilsontoddAug 17, 2025
      If the outdoor unit of your Haier Air Conditioner isn't heating well, it could be due to several reasons. The indoor EEV might not be open, which requires the same treatment as a cooling problem. The evaporator could be blocked by weld or dirt, needing the same cleaning procedure as for cooling issues. Additionally, the system might lack refrigerant, which also requires the same treatment as in cooling problems.
  • P
    pateljenniferAug 25, 2025
    How to fix Haier Air Conditioner wired controller displaying 8888?
    • K
      kingmichelleAug 25, 2025
      If the wired controller of your Haier Air Conditioner displays '8888' circularly and cannot recover, check if SW01 on the PCB is set to '0'. If not, change SW01 to '0'. Also, make sure that CN30 on the PCB is short-connected; if not, create a short connection.

Summary

Part 1 Installation regulation

1. Installation flowchart

Step-by-step guide for installing the air conditioning unit.

2. Equipment delivery

Procedures and precautions for receiving and unpacking equipment.

3. Outdoor installation

Guidelines for selecting the location and mounting the outdoor unit.

4. Indoor installation

Procedures for installing the indoor unit, including mounting and placement.

5. Piping work

Instructions for installing refrigerant pipes, focusing on cleanliness and integrity.

6. Water drainage pipe installation

Guidelines for installing the condensate drain pipe to ensure proper water removal.

7. Insulation treatment

Requirements for insulating pipes to prevent heat loss and condensation.

8. Electric wiring

Instructions for connecting electrical wiring for indoor and outdoor units safely and correctly.

9. Pipe cleaning work

Method for cleaning the refrigerant pipes to remove impurities before operation.

10. Leakage test

Procedure for testing the refrigerant system for leaks using nitrogen.

11. Evacuation

Steps for evacuating the system to remove air and moisture.

12. Additional Refrigerant Charging

Guidance on charging the system with the correct amount of refrigerant.

13. Trial operation

Steps to perform before and during the initial operation of the system.

14. Transfer to user

Procedures for handing over the system and documentation to the user.

Part 2 Commissioning and Maintenance for R22 System

1. Working preparation before commissioning

Initial checks and preparations before starting the commissioning process.

2. Cooling commissioning

Steps and procedures for commissioning the system in cooling mode.

3. Heating commissioning

Steps and procedures for commissioning the system in heating mode.

4. Trouble diagnose and trouble shooting

Methods for identifying and resolving common problems and faults.

5. Attached tables

Supplementary tables containing data for refrigerant charging, settings, and codes.

Part 3 Debugging & Maintenance for R410 A System

1. Working preparation before commissioning

Pre-commissioning checks and preparations specific to R410A systems.

2. Trial operation and the performance

Procedures for trial operation and evaluating system performance.

3. Failure code

List and description of failure codes for troubleshooting.

4. Trouble diagnose and trouble shooting

Diagnostic methods and solutions for system malfunctions.

Part 4 Wiring diagram

1. Wiring diagram of outdoor unit

Electrical wiring diagrams for various outdoor unit configurations.

2. Wiring diagram of indoor unit

Electrical wiring diagrams for different types of indoor units.

Haier MRV II Specifications

General IconGeneral
BrandHaier
ModelMRV II
CategoryAir Conditioner
LanguageEnglish

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