Gree GUHN48NM3HO User Manual

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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

Other manuals for Gree GUHN48NM3HO

Service Manual141 pages

Questions and Answers:

R
robert67Aug 9, 2025
Why is my Gree GUHN48NM3HO Air Conditioner not cooling properly?
- J
  John HernandezAug 9, 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.
D
dukekevinAug 14, 2025
Why does my Gree GUHN48NM3HO Air Conditioner operate for a while and then stop?
- M
  Mrs. Bailey Hayes DDSAug 14, 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
jonathanbakerAug 20, 2025
How to improve the heating effect of my Gree GUHN48NM3HO Air Conditioner?
- R
  Ronald PerezAug 20, 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.
J
James GreenAug 27, 2025
What to do if my Gree GUHN48NM3HO unit cannot be started?
- A
  allensandraAug 27, 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.
C
Corey HortonSep 1, 2025
What to do if my Gree GUHN48NM3HO Air Conditioner displays error code E1?
- B
  Brent AndersonSep 1, 2025
  If your Gree Air Conditioner shows the E1 error code, switch off the unit immediately and seek assistance from a qualified technician for maintenance.

Gree GUHN48NM3HO Specifications

General

Heating Seasonal Performance Factor (HSPF)	9.0
Refrigerant	R410A
Power Supply	208-230V/60Hz/1Ph
Type	Split System
Cooling Capacity	48000 BTU/h
Heating Capacity	48000 BTU/h

Summary

Safety Precautions

General Installation Warnings

Critical safety warnings for installing the air conditioner unit.

Electrical Safety and Wiring Precautions

Guidelines for safe electrical connections and wiring practices.

Refrigerant Handling Safety

Safety measures concerning refrigerant leaks and handling.

Refrigerant Circuit Safety

Procedures to prevent refrigerant circuit issues like air inclusion or rupture.

Grounding and Electrical Protection

Importance of proper grounding and earth leakage breaker installation.

User and Child Safety Guidelines

Flammable Gas and Flooding Precautions

Installation Location Selection

General Location Warnings

Indoor Unit Installation Site Criteria

Outdoor Unit Installation Site Criteria

Electrical Requirements

Indoor Unit Electrical Specs

Outdoor Unit Electrical Specs

Unit Installation Procedures

Indoor Unit Installation

Step-by-step guide for installing the indoor cassette unit.

Installing the Main Indoor Unit Body

Detailed steps and diagrams for mounting the main indoor unit body.

Installing Suspension Bolts

Instructions for drilling and installing suspension bolts for the indoor unit.

Indoor Unit Leveling Procedure

Method for ensuring the indoor unit is installed horizontally using a water level test.

Outdoor Unit Installation Warnings

Piping Installation

Connection Pipe Flare Processing

Steps for preparing the ends of the connection pipes using a flaring tool.

Pipe Bending Techniques

Pipe Bending Precautions

Connecting Pipes at Indoor Unit

Procedures for connecting refrigerant pipes to the indoor unit, including tightening torque.

Flare Nut Tightening Torque Specifications

Table specifying the correct torque for tightening flare nuts based on pipe diameter.

Connecting Pipes at Outdoor Unit

Instructions for connecting refrigerant pipes to the outdoor unit.

Checking for Gas Leaks

Method for detecting refrigerant leaks using a gas leakage detector.

Liquid Pipe and Drain Pipe Installation

Drain Pipe Installation Details

Vacuum and Leakage Inspection

CAUTION regarding vacuum pump usage for installation and leak checks.

System Evacuation and Leak Testing

Vacuuming the Refrigerant System

Step-by-step procedure for evacuating the system using a vacuum pump.

Vacuum Gauge Reading and Leak Verification

How to interpret vacuum gauge readings to confirm system integrity.

Drain Piping Installation

Drain Piping Installation Guidelines

Connecting Drain Pipes

Riser Piping Work Precautions

Riser Piping Installation Details

Drain Piping Flow Test

Procedure for testing drain piping functionality by adding water and checking flow.

Electrical Wiring

Electrical Wiring Precautions

Critical safety warnings and guidelines for electrical wiring procedures.

Indoor Unit Wiring

Detailed instructions for wiring connections within the indoor unit's electric box.

Solid and Strand Wiring Methods

Techniques for preparing and connecting solid and stranded wires to terminals.

Securing Power and Connection Cords

Instructions for using cord clamps to secure power and connection cords properly.

Indoor/Outdoor Unit Wiring Diagrams (Single Phase 18k)

Wiring diagram and specifications for single-phase 18k units.

Indoor/Outdoor Unit Wiring Diagrams (Single Phase 24-30K)

Wiring diagram and specifications for single-phase 24-30k units.

Indoor/Outdoor Unit Wiring Diagrams (Three Phase 36-48k)

Indoor/Outdoor Unit Wiring Diagrams (Three Phase 60k)

Indoor Unit Wiring Connections

Wiring Interference Precautions

Indoor Unit Wiring Compliance

Outdoor Unit Wiring Connections (Single Phase)

Outdoor Unit Wiring Connections (Three Phase)

Operation and Testing

Trial Operation and Error Codes

Error Code Interpretation

Troubleshooting and Maintenance

Troubleshooting Common Failures

Routine Maintenance

Maintenance Safety and Warnings

Air Filter Cleaning Procedure

Opening the Panel Grille

Disassembling and Cleaning the Filter

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