1. Introduction and Overview
This manual provides essential information for the installation, operation, and maintenance of your Gree Multi21+ Dual-Zone Concealed Duct Mini Split Air Conditioner Heat Pump. This system is designed to provide efficient heating and cooling for two distinct zones within a building.
The Multi21+ system utilizes Gree's G10 inverter-driven compressor technology and eco-friendly R410A refrigerant. The concealed duct indoor units are designed for discreet installation above suspended ceilings or within closet spaces, delivering conditioned air through ductwork and grilles.
Key features include:
- Dual-zone capability for independent temperature control.
- Concealed duct indoor units for aesthetic integration.
- G10 Inverter Technology for energy efficiency and stable temperatures.
- Heating and cooling functionality.
- Quiet operation.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation and operating instructions thoroughly before installing or servicing this equipment.
- Installation and servicing must be performed by a qualified, licensed HVAC technician.
- Ensure all electrical connections comply with local and national electrical codes.
- Do not attempt to repair or modify the unit yourself. Contact a qualified service professional.
- Always disconnect power to the unit before performing any maintenance or cleaning.
- Refrigerant R410A is under high pressure. Only trained personnel should handle refrigerant.
3. Product Components
The Gree Multi21+ system consists of the following main components:
- Outdoor Condenser Unit: Houses the compressor and outdoor coil.
- Indoor Concealed Duct Units (x2): Installed within ceilings or walls, connected to ductwork.
- Remote Controls (x2): For individual zone control.
Figure 3.1: Overview of the Gree Multi21+ Dual-Zone Mini Split System, showing the outdoor condenser unit, two concealed duct indoor units, and two remote controls.
Figure 3.2: A single Gree concealed duct indoor unit, designed for hidden installation within a ceiling or wall cavity.
Figure 3.3: The Gree outdoor condenser unit, featuring the GREE logo and inverter technology label.
Figure 3.4: Two remote controls for operating the Gree Multi21+ system, each controlling an individual indoor unit.
4. Setup and Installation
The installation of the Gree Multi21+ Dual-Zone Concealed Duct Mini Split Air Conditioner Heat Pump is complex and requires specialized knowledge and tools. It is mandatory that installation be performed by a state-licensed HVAC contractor to ensure proper function, safety, and warranty eligibility.
Key installation considerations include:
- Proper sizing and placement of indoor and outdoor units.
- Installation of refrigerant line sets (1/4" x 1/2" line set x2 required, not included).
- Electrical wiring according to local codes (208/230V).
- Ductwork design and installation for concealed indoor units.
- Condensate drainage system setup.
- System evacuation and refrigerant charging.
Refer to the separate detailed installation manual provided with the product for specific instructions, diagrams, and safety precautions for licensed professionals.
5. Operating Instructions
Each indoor unit is controlled independently by its dedicated remote control. Familiarize yourself with the remote control functions for optimal comfort.
5.1 Basic Operation
- Power On/Off: Press the 'On/Off' button to start or stop the unit.
- Mode Selection: Use the 'Mode' button to cycle through operating modes: Cool, Heat, Fan, Dry, Auto.
- Temperature Adjustment: Use the 'Up' and 'Down' arrow buttons to set your desired temperature.
- Fan Speed: Adjust fan speed using the 'Fan' button (Auto, Low, Medium, High).
5.2 Advanced Functions
- Timer Function: Set the unit to turn on or off automatically at a specified time.
- Sleep Mode: Optimizes temperature and fan speed for comfortable sleep.
- Swing Function: Adjusts the airflow direction.
Figure 5.1: The system provides both cooling (left) and heating (right) capabilities for year-round comfort.
6. Maintenance
Regular maintenance ensures the longevity and efficient operation of your Gree Multi21+ system. Always disconnect power to the unit before performing any maintenance.
6.1 Air Filter Cleaning
The indoor units are equipped with air filters that should be cleaned regularly (typically every 2-4 weeks, depending on usage and air quality). Refer to the indoor unit's specific instructions for filter access and cleaning procedures.
- Carefully remove the air filters.
- Clean filters with a vacuum cleaner or wash with lukewarm water and mild detergent.
- Allow filters to dry completely before re-installing.
6.2 Outdoor Unit Maintenance
The outdoor unit's coils can accumulate dirt and debris, reducing efficiency. Periodically inspect and clean the outdoor coil. This task is best performed by a qualified technician.
6.3 Professional Inspection
It is recommended to have a licensed HVAC technician perform a professional inspection and tune-up of your system annually. This includes checking refrigerant levels, electrical connections, and overall system performance.
7. Troubleshooting
Before contacting service, review the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on | No power, remote control batteries low, circuit breaker tripped. | Check power supply, replace remote batteries, reset circuit breaker. |
| Insufficient cooling/heating | Dirty air filters, blocked outdoor unit, incorrect mode setting, low refrigerant. | Clean air filters, clear obstructions from outdoor unit, verify mode, contact technician for refrigerant check. |
| Unusual noise | Loose parts, foreign objects, compressor issue. | Inspect for loose parts, remove foreign objects, contact technician if noise persists. |
| Water leakage | Blocked condensate drain, improper installation. | Clear drain line, contact technician for inspection. |
If the problem persists after attempting these solutions, contact a qualified HVAC service technician.
8. Specifications
The following table outlines the general specifications for the Gree Multi21+ Dual-Zone Concealed Duct Mini Split Air Conditioner Heat Pump, Model MULTI24CDUCT205:
| Specification | Value |
|---|---|
| Brand | GREE |
| Model Number | MULTI24CDUCT205 |
| Capacity | 2 Tons (24,000 BTU) |
| Seasonal Energy Efficiency Ratio (SEER) | 21 |
| Voltage | 230 Volts |
| Noise Level (Outdoor Unit) | 50 Decibels |
| Refrigerant | R 410A |
| Installation Type | Split System (Concealed Duct) |
| Material Type | Steel |
| Special Feature | Air Purification Filter |
| Item Weight (Outdoor Unit) | 153 pounds |
| Product Dimensions (Outdoor Unit) | 17 x 38 x 31 inches |
8.1 Unit Dimensions
Figure 8.1: Dimensions for various BTU capacities of Gree Duct-A indoor and outdoor units. Refer to this table for specific measurements relevant to your 18,000 BTU indoor units and 24,000 BTU outdoor unit.
9. Warranty and Support
Gree provides a manufacturer's warranty for this product:
- 5 Years on Parts
- 7 Years on Compressor
Please Note: To be eligible for the manufacturer's warranty, installation must be performed by a state-licensed HVAC contractor.
For technical support, service inquiries, or warranty claims, please contact your installing HVAC contractor or refer to the official Gree website for customer service contact information.
