This document serves as a technical manual for the DC Inverter Multi-Split System, operating at 50Hz and using R32 refrigerant. It covers general information, indoor units (wall-mounted, duct type, and 4-way cassette), and outdoor units, along with installation, test running, and controller details.
The DC Inverter Multi-Split System features a 180° sine wave compressor control, which contributes to higher efficiency, lower power consumption, and reduced noise. It incorporates world-famous brand twin rotary DC inverter compressors capable of rotating speeds as low as 30 RPS, ensuring excellent efficiency even under partial load conditions. The system offers stable operation across a wide temperature range: cooling from -15°C to 50°C and heating from -15°C to 30°C.
Electrically, the system boasts a newly designed E-box with optimized airflow for fresh air cooling of the inverter module. The electric control integrates multiple components onto a single PCB, reducing component damage rates and maintenance costs. An upside-down installation method for the electric control minimizes wire connection length and prevents dust and water from falling onto the PCB. The E-box material has transitioned from metal to plastic, reducing weight and eliminating short-circuit risks from PCB contact with metal.
From a system design perspective, anticorrosive components are used to extend service life. The Electronic Expansion Valve (EXV) design allows for precise refrigerant flow control, leading to accurate capacity output, enhanced user comfort, and energy savings. The system offers a "free match" concept, allowing users to choose from various indoor unit appearances and combine multiple indoor units to meet diverse requirements for offices, homes, villas, and other applications.
Indoor Units
The manual details three types of indoor units:
Wall-Mounted Type
- Function Description: Available in 150, 155, and 156 styles, these units offer various aesthetic panels to suit different preferences. Standard functions include auto-restart and sleep mode, with golden fins and certain filters available as optional features.
- Technical Specifications:
- Models: CSG-07HVR4-A, CSG-09HVR4-A, CSG-12HVR4-A, CSG-18HVR4-A, CSG-24HVR4-A.
- Power Supply: 220~240V/1Ph/50Hz for all models.
- Cooling Capacity (Btu/h): 7000 (07HVR4-A), 9000 (09HVR4-A), 12000 (12HVR4-A), 18000 (18HVR4-A), 24000 (24HVR4-A).
- Heating Capacity (Btu/h): 8000 (07HVR4-A), 10000 (09HVR4-A), 13000 (12HVR4-A), 19000 (18HVR4-A), 25000 (24HVR4-A).
- Indoor Fan Motor: AC type, with speeds ranging from 900/800/740 r/min to 1250/1050/950 r/min depending on the model.
- Indoor Coil: 2 rows, 21x12.7 mm tube pitch, 1.5-1.6 mm fin spacing, hydrophilic aluminum fins, Φ7 mm inner screw tubes, 2-5 circuits.
- Indoor Air Flow (H/M/L): 400/350/320 m³/h to 1000/900/700 m³/h.
- Noise Level (H/M/L): 30/27/24 dB(A) to 45/42/38 dB(A).
- Dimensions (W×H×D): 878×290×227 mm (07/09/12k models), 953×347×270 mm (18k models), 1180×362×288 mm (24k models).
- Refrigerant Pipe (Liquid/Gas): Φ6.35/Φ9.52 mm (07/09/12k models), Φ6.35/Φ9.52 mm or Φ6.35/Φ12.7 mm or Φ9.52/Φ15.88 mm (18k/24k models).
- Drainage Pipe Diameter: DN25.
- Controller: Remote Controller (standard).
- Usage Features: Various functions like auto-restart and sleep mode are standard. Optional features include golden fins and certain filters.
- Maintenance Features: The manual includes exploded views and parts lists for easy identification and replacement of components. Troubleshooting guides are provided for common faults indicated by display codes (FE, E0-E8, EE, EF) and LED light patterns.
Duct Type
- Function Description: These units feature a short body for easy installation. They utilize aviation centrifugal fans and CFD technology for increased air volume and reduced noise. They offer three fan speeds to meet different requirements and use high-efficiency DC fan motors for low noise and precise indoor temperature control. The E-box is designed for body-side access, simplifying installation and maintenance.
- Technical Specifications:
- Models: CST-07HVR4-A, CST-09HVR4-A, CST-12HVR4-A, CST-18HVR4-A.
- Power Supply: 220~240V/1Ph/50Hz for all models.
- Cooling Capacity (Btu/h): 7000 (07HVR4-A), 9000 (09HVR4-A), 12000 (12HVR4-A), 18000 (18HVR4-A).
- Heating Capacity (Btu/h): 8000 (07HVR4-A), 10000 (09HVR4-A), 13000 (12HVR4-A), 19000 (18HVR4-A).
- Indoor Fan Motor: DC type, with speeds ranging from 1130/980/920 r/min to 1300/1150/1050 r/min.
- Indoor Coil: 2 rows, 21x12.7 mm tube pitch, 1.4 mm fin spacing, hydrophilic fins, Φ7 mm inner screw tubes, 4 circuits.
- Indoor Air Flow (H/M/L): 550/410/340 m³/h to 800/700/600 m³/h.
- Noise Level (H): 47 dB(A) to 52 dB(A).
- Dimensions (W×H×D): 814×210×467 mm (07/09/12k models), 1010×210×467 mm (18k models).
- Refrigerant Pipe (Liquid/Gas): Φ6.35/Φ9.52 mm (07/09/12k models), Φ6.35/Φ12.7 mm (18k model).
- Drainage Pipe Diameter: DN25.
- Controller: Remote Controller (standard).
- Usage Features: Short body for easy installation, three fan speeds, high-efficiency DC fan motor for precise temperature control.
- Maintenance Features: Exploded views and parts lists are provided. Troubleshooting guides cover communication failures, sensor faults, outdoor unit malfunctions, and EEPROM errors, indicated by display codes (E1-E5, E7-E8, EE) and LED light patterns.
4-way Cassette Type
- Function Description: Features a newly developed, uniform standard panel for a simple and convenient appearance. Ultra-thin body design (minimum height 267mm) saves installation space. Includes a built-in water pump with a head up to 700mm. High-efficiency DC fan motor ensures low noise and comfortable operation, precisely controlling indoor temperature. The built-in water tray, insulated with foam coated by special plastic, effectively prevents condensed water leakage. Standard with wireless controller, with wired controller as an option.
- Technical Specifications:
- Models: CSC-07HVR4-A, CSC-09HVR4-A, CSC-12HVR4-A, CSC-18HVR4-A.
- Power Supply: 220~240V/1Ph/50Hz for all models.
- Cooling Capacity (Btu/h): 7000 (07HVR4-A), 9000 (09HVR4-A), 12000 (12HVR4-A), 18000 (18HVR4-A).
- Heating Capacity (Btu/h): 8000 (07HVR4-A), 10000 (09HVR4-A), 13000 (12HVR4-A), 19000 (18HVR4-A).
- Indoor Fan Motor: DC type, with input ranging from 21/16/12W to 30/24/18W. Speeds from 670/590/500 r/min to 790/740/610 r/min.
- Indoor Coil: 2 rows, 21x13.37 mm tube pitch, 1.4 mm fin spacing, hydrophilic fins, Φ7 mm inner screw tubes, 4 circuits.
- Indoor Air Flow (H/M/L): 540/490/410 m³/h to 790/710/610 m³/h.
- Noise Level (H): 39/36/33 dB(A) to 44/41/38 dB(A).
- Dimensions (W×H×D): Body: 565×267×565 mm; Panel: 650×30×650 mm.
- Refrigerant Pipe (Liquid/Gas): Φ6.35/Φ9.52 mm (07/09/12k models), Φ6.35/Φ12.7 mm (18k model).
- Drainage Pipe Diameter: DN25.
- Controller: Remote Controller (standard), Wired Controller (optional).
- Usage Features: Ultra-thin body, built-in water pump, high-efficiency DC fan motor, standard wireless controller, optional wired controller.
- Maintenance Features: Exploded views and parts lists are provided. Troubleshooting guides cover communication failures, sensor faults, outdoor unit malfunctions, EEPROM errors, and wired controller communication failures, indicated by display codes (E1-E5, E7-E9, EE) and LED light patterns.
Outdoor Units
- Function Description: One outdoor unit can match multiple indoor units, offering free combination for small offices, houses, villas, etc. It is also suitable for larger buildings with limited A/C space. The DC Inverter Multi Series simplifies installation with soft start for the compressor, reducing initial current. Easy piping and wiring connections, using flare nuts instead of welding, make installation convenient.
- Technical Specifications:
- Models: C2OU-14HDR4-A, C2OU-18HDR4-A (Dual-split); C3OU-21HDR4-A, C3OU-27HDR4-A (Tri-split); C4OU-28HDR4-A, C4OU-36HDR4-A (Fourfold-split); C5OU-42HDR4-A (Fivefold-split).
- Power Supply: 220~240V/1Ph/50Hz for all models.
- Cooling Capacity (Btu/h): 7000-14000 (C2OU-14HDR4-A) to 7000-42000 (C5OU-42HDR4-A).
- Heating Capacity (Btu/h): 8000-16000 (C2OU-14HDR4-A) to 8000-44000 (C5OU-42HDR4-A).
- Compressor: DC type, with capacities ranging from 4450W to 10010W.
- Fan Motor: DC type, with speeds of 800 r/min or 840 r/min.
- Outdoor Coil: 1-2 rows, 25x22 mm or 22x19.05 mm tube pitch, 1.6 mm fin spacing, hydrophilic fins, Φ9.52/Inner screw or Φ7.94/Inner screw tubes, 2-5 circuits.
- Outdoor Air Flow: 2800 m³/h to 5000 m³/h.
- Noise Level: 54 dB(A) to 62 dB(A).
- Dimensions (W×H×D): 944×608×345 mm (Dual-split), 989×843×392 mm (Tri-split), 1090×997×399 mm (Fourfold/Fivefold-split).
- Refrigerant Type: R32.
- Charged Volume: 1200g to 3300g.
- Refrigerant Piping (Liquid/Gas): 2×(Φ6.35/Φ9.52) mm to 5×(Φ6.35/Φ9.52) mm.
- Max. Pipe Length: 30m to 75m.
- Max. Height Difference: 10m.
- Connection Wiring: Power: 3×2.5 mm² to 3×6 mm²; Signal: 4×1 mm².
- Ambient Temperature: -15~52°C.
- Usage Features: Free combination of indoor units, soft start compressor, easy piping and wiring. Operation limits are clearly defined for both cooling and heating modes, specifying ranges for outdoor and indoor temperatures.
- Maintenance Features: Exploded views and parts lists are provided. Troubleshooting guides cover a wide range of fault codes (E0-E7, H0, H4-H6, H9-H10, P1-P6, P9-P11, L0-L2, L4-L5, L7-L9) with corresponding fault contents and remarks, including break times and restore conditions. Field wiring diagrams are included for proper electrical connections.
Installation
The manual provides detailed instructions for selecting installation places for both indoor and outdoor units, emphasizing clearances, drainage, and noise considerations. Rooftop installation guidelines are also included. Refrigerant pipe connection instructions cover flaring work, burr removal, nut tightening, and pipe diameter specifications. Air purging procedures using a vacuum pump are explained, along with precautions for handling packed valves. Safety and leakage checks, including insulated resistance, grounding, electrical leakage, and gas leak detection methods (soap water and leak detector), are outlined. Water drainage instructions emphasize proper gradient, support, and heat insulation to prevent condensation. Refrigerant pipe insulation details material, thickness, and work procedures.
Test Running
Before test running, users are instructed to verify pipeline and communication line connections, power supply voltage, and ensure no short circuits. It is crucial to confirm that all units have passed nitrogen pressure-maintaining tests and that the system is fully vacuumized, dried, and filled with refrigerant as specified. The manual also covers dialing settings for the main control board, outdoor unit spot-check instructions, and the process of filling names for connecting systems. Precautions against refrigerant leaks are highlighted, including calculating refrigerant concentration to ensure it remains below critical levels.
Controller
The manual describes both wireless remote controllers (NT-03A) and wired controllers (ZKX-C/TE-05).
Wireless Remote Controller (NT-03A)
- Function Description: The NT-03A features 15 buttons and an LCD screen displaying various icons for mode (automatic, cooling, dehumidification, fan, heating), temperature (16~32°C or 61~90°F), wind speed (manual or automatic), swinging (external or internal pendulum), timer (ON/OFF), clock, sleep, turbo, ECON, cleaning, electric heating, address, lock, and lack of electricity.
- Usage Features:
- ON/OFF: Toggles power. Default settings on first power-on: 25°C (77°F), automatic mode, automatic fan speed, internal and external pendulum wind, no TURBO, no sleep, no timer, no lock. Recovers previous state after shutdown, except for sleep, TURBO, ECON, and timer functions.
- Mode: Cycles through automatic, cooling, dehumidification, fan, heating. Dehumidification mode locks temperature at 25°C, and external pendulum wind is forced off.
- Temperature Adjustment (▲/▼): Changes temperature by 1°C/°F. Used for clock setting. Continuous press for continuous change.
- Up and Down Swinging: Controls external pendulum wind. Forced off in dehumidification mode. Cycles through swing, fixed wind, swing in other modes.
- FAN (-/+): Adjusts wind speed (automatic, high, middle, low). Fixed to low in dehumidification mode. Cycles through automatic, high, middle, low, automatic (FAN -) or automatic, low, middle, high, automatic (FAN +).
- Timer: Sets opening/shutdown time from 1 to 24 hours. Exits adjustment after 3 seconds of inactivity.
- TURBO: Toggles TURBO mode in cooling/heating. Disables wind speed display. Switching mode or entering sleep cancels TURBO. Lights up TURBO icon and runs fan at fourth gear if available.
- ECON: Not default. Toggles ECON mode in cooling/heating. Sets temperature to 26°C (77°F). Switching mode cancels ECON.
- Sleep: Toggles sleep function in all modes except fan mode. Switching mode cancels sleep. Automatically switches to low wind speed.
- Light: Toggles lamplight.
- Clock: Sets hour (0-23) and minute (00-59) using temperature adjustment keys. Confirmed by pressing clock key again or exits after 3 seconds of inactivity.
- Lock: Toggles lock function. When locked, only the lock key works.
- Combinatorial Key (FAN - + FAN +): Switches between 3-gear and 6-gear wind speeds.
- Combinatorial Key (Mode + Lock): Enters address setting interface. Allows adjusting address (00-63) and sending setting code. Inquiring address displays last setting. Exits after 30 minutes of inactivity.
- Maintenance Features: Battery replacement instructions are provided, including warnings about mixing old/new batteries and recommended service life.
Wired Controller (ZKX-C/TE-05)
- Function Description: The wired controller provides comprehensive control over the air conditioning system, including operation status display, parameter settings, and fault indications. It features a clear LCD screen and various buttons for mode selection, fan speed adjustment, temperature control, and other functions.
- Usage Features: The manual includes detailed instructions for connecting the wired controller, ensuring proper wiring and grounding. It also provides a brief description of the installation and disassembly process.
- Maintenance Features: The manual emphasizes the importance of proper installation and maintenance to ensure the controller's longevity and prevent malfunctions. It includes warnings regarding potential issues like loose screws causing deformation or damage to the PCB.
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