This document is the Owner's Manual for the Gree GMV DC Inverter VRF (Variable Refrigerant Flow) Commercial Air Conditioners. It provides original instructions for installation, operation, and maintenance of these units.
Function Description:
The Gree Multi VRF Modular System utilizes inverter compressor technology to achieve stepless capacity regulation within a range of 10% to 100%. This allows for precise control of cooling and heating, making the units suitable for various working areas, especially those with variable load changes. The system is designed for commercial use and employs eco-friendly R410A refrigerant. It supports combinations of multiple outdoor and indoor units, offering a wide capacity range from 22.4kW to 272kW. The system automatically adjusts its operation based on the required capability of the indoor units.
Important Technical Specifications:
- Refrigerant: R410A
- Capacity Range: 22.4kW to 272kW (for outdoor units)
- Capacity Regulation: 10% to 100% stepless regulation
- Outdoor Unit Models Covered: GMV-224WM/G-U, GMV-280WM/G-U, GMV-335WM/G-U, GMV-400WM/G-U, GMV-450WM/G-U, GMV-504WM/G-U, GMV-560WM/G-U, GMV-615WM/G-U, GMV-680WM/G-U, and various larger combinations up to GMV-2720WM/G-U.
- Operating Temperature Range (Cooling): Ambient: -15°C (5°F) to 48°C (118.4°F) DB; Indoor: 14°C (57.2°F) to 25°C (77°F) WB. Cooling at -15°C (5°F) to -5°C (23°F) is conditional, with the lowest general operating temperature for cooling being -5°C (23°F).
- Operating Temperature Range (Heating): Ambient: -25°C (-13°F) to 24°C (75.2°F) DB; Indoor: 15°C (59°F) to 27°C (80.6°F) DB.
- Indoor Humidity: ≤80%
- VRF Fresh Air Processor Operating Range: Ambient temperature: 16°C (60.8°F) to 45°C (113°F) for cooling; -7°C (19.4°F) to 16°C (60.8°F) for heating.
- Design Pressure: 4.3 MPa
- Pipe Specifications: Copper pipes with specific external diameters and minimum wall thicknesses are required, ranging from Φ6.35mm (1/4 inch) with ≥0.8mm (1/32 inch) thickness to Φ54.1mm (2-1/8 inch) with ≥1.5mm (1/17 inch) thickness. Inner and outer surfaces of the pipeline must be free of defects.
- Allowable Pipe Lengths:
- Total actual length of fitting pipe: ≤1000m (3280-3/4 ft.)
- Length of farthest fitting pipe (actual): ≤200m (656-3/16 ft.)
- Length of farthest fitting pipe (equivalent): ≤240m (787-1/2 ft.)
- Equivalent length from the first branch to the furthest indoor unit: ≤120m (393-3/4 ft.)
- Height difference (Outdoor unit at upper): ≤100m (328-3/4 ft.)
- Height difference (Outdoor unit at lower): ≤110m (360-7/8 ft.)
- Height difference between indoor units: ≤30m (98-1/2 ft.)
- Conditional pipe length from the first branch of IDU to the farthest IDU can reach 120m (393-3/4 ft.) under specific conditions.
- Refrigerant Charging: Calculated based on pipeline length and module capacity.
- Electrical Parameters: Outdoor units require specific power supply (e.g., 440-460V 3~60Hz) with corresponding fuse capacity, minimum circuit ampacity, and maximum overcurrent protection (e.g., 25A for GMV-224WM/G-U, 45A for GMV-680WM/G-U). Copper-core cables complying with local regulations are mandatory.
- Communication: CAN bus communication mode between indoor and outdoor units, and among indoor units. Communication lines between indoor units and wired controllers, and between indoor/outdoor units, have specific length and wire diameter requirements (e.g., L≤250m for wired controller, L≤1000m for indoor/outdoor unit communication, with 2xAWG18 or 2xAWG16 wire diameter). Shielded wires are recommended in environments with strong electromagnetic interference.
Usage Features:
- Installation Flexibility: Detailed guidelines for outdoor unit installation, including considerations for seasonal wind, snow, and required installation space (e.g., minimum distances from walls, height requirements for obstacles).
- Modular Design: Supports various combinations of outdoor units, with specific rules for connecting modular units (e.g., capacity order, pipe sizing based on upstream/downstream capacity).
- Manifold Installation: Instructions for Y-type and T-type manifolds, emphasizing correct orientation (vertical or horizontal) and fixation points to ensure proper refrigerant distribution and prevent leakage.
- Refrigerant Charging Process: Detailed multi-step procedure for pre-charging and start-up charging of refrigerant, including vacuum drying and leakage tests using nitrogen.
- Electrical Safety: Emphasizes the need for professional electricians, dedicated power supply, reliable grounding, circuit breakers with magnetic and thermal tripping functions, and proper wiring to prevent electric shock or fire.
- Automatic Addressing: Indoor and outdoor units adopt automatic addressing technology, simplifying setup.
- Debugging Methods: Offers three debugging methods: pressing buttons on the outdoor unit's main board, using proprietary PC software, or a multi-functional debugger. The manual provides a detailed display instruction for each stage of debugging.
- Error Indication: A comprehensive list of error codes for both indoor and outdoor units, covering malfunctions related to sensors, communication, power supply, compressors, and other components, aiding in troubleshooting.
Maintenance Features:
- Regular Inspections: Recommends regular inspection and maintenance to extend the service life of the air conditioning unit.
- Heat Exchanger Cleaning: Instructions for cleaning the outdoor unit's heat exchanger using a vacuum cleaner with a nylon brush or compressed air to remove dust and debris. Washing with tap water is not recommended.
- Drain Pipe Check: Regular checks of the drain pipe to ensure smooth condensate drainage.
- Seasonal Maintenance (Beginning of Season):
- Verify unblocked air inlets and outlets.
- Check grounding reliability.
- Replace remote controller batteries.
- Ensure air filter is properly installed.
- Preheat the outdoor compressor crankcase for 2 hours before starting after a long stop.
- Confirm firm installation of the outdoor unit.
- Seasonal Maintenance (End of Season):
- Cut off main power.
- Clean filters and unit bodies.
- Remove dust and debris.
- Apply oil paint to rusted outdoor units to prevent expansion.
- Parts Replacement: Accessories are available through authorized Gree offices or dealers.
- Safety during Maintenance: Strict warnings against mixing dangerous gases (oxygen, acetylene) into the refrigeration circuit during air tightness and leak tests, recommending nitrogen instead. Emphasizes contacting authorized service centers for abnormal situations or repairs to prevent electric shock or fire.
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