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Gree GUHN18NK3HO - User Manual

Gree GUHN18NK3HO
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Owner's Manual
Air Conditioners
Indoor Unit Outdoor Unit
GKH18K3HI GUHN18NK3HO
GKH24K3HI GUHN24NK3HO
GKH30K3HI GUHN30NK3HO
GKH36K3HI GUHN36NM3HO
GKH42K3HI GUHN42NM3HO
GKH48K3HI GUHN48NM3HO
GKH60K3HI GUHN60NM3HO
Thank you for choosing Air Conditioners, please read this owner’s manual carefully before operation
and retain it for future reference.If you have lost the Owner’s Manual, please contact the local agent or
visit www.gree.com or send email to global@gree.com.cn or electronic version.
GREE reserves the right to interpret this manual which will be subject to any change due to product
improvement without further notice.
GREE Electric Appliances, Inc. of Zhuhai reserves the final right to interpret this manual.
Cassette Type
Air Conditioner Unit

Table of Contents

Questions and Answers

  • J
    Julian MartinezAug 3, 2025
    Why is my Gree GUHN18NK3HO not cooling properly?
    • C
      Clayton McdonaldAug 3, 2025
      Several factors can cause a Gree Air Conditioner to have a poor cooling effect. The air filter might be dirty or blocked, so cleaning or replacing it is recommended. There might be too many people or heat sources in the room; try to reduce these. Ensure all doors and windows are closed. Obstacles at the air intake or outlet should be removed. The set temperature might be too high, so lower it. A refrigerant leakage could also be the cause, requiring a check and refill. Lastly, the room temperature sensor might be faulty, and testing or replacing it may be necessary.
  • I
    isabelbooneAug 11, 2025
    Why does my Gree GUHN18NK3HO operate for a while and then stop?
    • L
      Lisa PerkinsAug 11, 2025
      If your Gree Air Conditioner operates for a while and then stops, check for any obstacles in front of the condenser and remove them. The control loop might be abnormal, requiring a check and repair. Also, if you're using cooling operation when the outdoor temperature is above 48°C, change the operation mode.
  • J
    John BarnesAug 18, 2025
    How to improve the heating effect of my Gree GUHN18NK3HO?
    • J
      James GarciaAug 19, 2025
      To improve the heating effect of your Gree Air Conditioner, start by cleaning or replacing the air filter if it's dirty or blocked. Ensure that all doors and windows are firmly closed. If the set room temperature is too low, raise it. Check for refrigerant leakage and refill if necessary. If the outdoor temperature is below -5°C, consider supplemental heating or check if the operation is appropriate. Finally, check and repair the control loop if it is abnormal.
  • E
    Eric BrandtAug 26, 2025
    What to do if my Gree Air Conditioner unit cannot be started?
    • C
      Cassidy NguyenAug 26, 2025
      If your Gree Air Conditioner won't start, first check the power supply connection. If the leakage switch is tripping, inspect for electrical leakage and correct it. Also, make sure the operating keys are not locked and unlock them if they are. If none of these resolve the issue, test and repair the control loop.

Summary

Safety Precautions

Unit and Main Parts Overview

Installation Preparations

Standard Accessory Parts

Lists and describes all standard accessory parts included with the air conditioner unit for installation.

Installation Location Selection

Guidance on choosing the optimal location for both indoor and outdoor units based on operational and environmental factors.

Connection Pipe Specifications

Details on the required specifications, lengths, and types for connecting pipes between indoor and outdoor units.

Electrical Requirements

Specifies the electrical wiring sizes, fuse capacities, and power supply requirements for the unit.

Unit Installation Procedures

Indoor Unit Installation

Step-by-step instructions for mounting and installing the indoor cassette unit, including dimensions, leveling, and suspension.

Outdoor Unit Installation

Guidelines for correctly installing the outdoor unit, considering stability, wind exposure, and condensate drainage.

Connection Pipe Installation

Detailed procedures for processing, bending, connecting, and insulating the refrigerant pipes.

Vacuum and Leakage Checks

Procedures for evacuating the system and performing gas leakage tests to ensure a safe and efficient installation.

Drain Hose Installation

Instructions for properly installing the drain piping, including gradient requirements and testing.

Panel Installation

Steps and precautions for installing the front panel of the indoor unit, ensuring proper fit and preventing air leaks.

Electrical Wiring

Guidance on connecting power cords and communication wires between indoor and outdoor units, including safety precautions.

Controller Installation

Test Running Procedures

Trial Operation and Testing

Instructions for performing initial trial operations, understanding error codes, and checking indicator lamps.

Operating Temperature Ranges

Details the acceptable indoor and outdoor ambient temperature ranges for cooling and heating operations.

Troubleshooting and Maintenance

Troubleshooting Common Issues

Identifies common failures and their possible causes, providing initial checks before seeking professional service.

Routine Maintenance Guide

Procedures for regular maintenance, focusing on cleaning air filters and general unit care by qualified personnel.

Gree GUHN18NK3HO Specifications

General IconGeneral
TypeSplit System
Voltage220-240V
RefrigerantR410A
Compressor TypeRotary
Indoor Unit Weight12 kg
Cooling Capacity18000 BTU
Heating Capacity18000 BTU
Operating Temperature (Cooling)18°C to 43°C
Power SupplySingle Phase

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