Haier MRV II User Manual

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.

Haier MRV II Specifications

General

Brand	Haier
Model	MRV II
Category	Air Conditioner
Language	English

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 R410A 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.