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Guidelines and warnings for the safe installation of the unit, covering potential hazards and precautions.
Critical safety instructions and warnings related to electrical wiring, grounding, and connections.
Essential safety measures and warnings for operating the unit, covering electrical, mechanical, and environmental risks.
Explanation of the model naming convention for Outdoor Units (ODU), detailing each component code.
Explanation of the model naming convention for Heat Recovery Units (HRU), detailing each component code.
Details on fundamental operational controls, including compressor and fan logic.
Control logic for Main and Subcooling EEVs in master-slave outdoor units, including temperature management.
Specific control functions beyond basic operation, such as oil return and defrost.
Mechanisms and component actions for defrosting the heat exchanger and partial defrost operations.
Details on system stop operation modes and oil equalizing control between compressors.
System protection mechanisms against various operational faults and conditions.
Control logic for discharge temperature and inverter protection based on amperage limits.
Error detection for phase issues and the function of the pressure sensor switch on the main PCB.
Covers initial setup steps 1-3: power on, code display, and PCB error check.
Details on the process for indoor unit auto addressing (Step 4) and confirming the number of units.
Procedure for setting system functions using DIP switches and control buttons, saving settings in EPROM.
Methods for operating the system during inverter compressor failure, including automatic backup and manual procedures.
Guidelines and warnings for the safe installation of the unit, covering potential hazards and precautions.
Critical safety instructions and warnings related to electrical wiring, grounding, and connections.
Essential safety measures and warnings for operating the unit, covering electrical, mechanical, and environmental risks.
Explanation of the model naming convention for Outdoor Units (ODU), detailing each component code.
Explanation of the model naming convention for Heat Recovery Units (HRU), detailing each component code.
Details on fundamental operational controls, including compressor and fan logic.
Control logic for Main and Subcooling EEVs in master-slave outdoor units, including temperature management.
Specific control functions beyond basic operation, such as oil return and defrost.
Mechanisms and component actions for defrosting the heat exchanger and partial defrost operations.
Details on system stop operation modes and oil equalizing control between compressors.
System protection mechanisms against various operational faults and conditions.
Control logic for discharge temperature and inverter protection based on amperage limits.
Error detection for phase issues and the function of the pressure sensor switch on the main PCB.
Covers initial setup steps 1-3: power on, code display, and PCB error check.
Details on the process for indoor unit auto addressing (Step 4) and confirming the number of units.
Procedure for setting system functions using DIP switches and control buttons, saving settings in EPROM.
Methods for operating the system during inverter compressor failure, including automatic backup and manual procedures.
The LG Multi V IV is a series of variable refrigerant flow (VRF) outdoor units designed for both heat pump and heat recovery applications, offering a range of capacities from 6.0 to 42.0 tons. These units are engineered to provide efficient comfort cooling and heating for various commercial and residential settings.
The Multi V IV system operates on a sophisticated control logic to ensure stable and efficient performance. At its core, the system utilizes fuzzy logic for compressor control, maintaining optimal evaporating temperatures (Te) during cooling and condensing temperatures (Tc) during heating. This intelligent control adjusts compressor operation based on the cooling and heating load, ensuring that the system operates at its most efficient point.
The outdoor units are available in two main types: Heat Pump (ARUN series) and Heat Recovery (ARUB series). Heat pump units provide either cooling or heating to all connected indoor units simultaneously. Heat recovery units, on the other hand, offer the flexibility of simultaneous cooling and heating to different indoor units, making them ideal for buildings with diverse thermal demands.
Key components like the Main Electronic Expansion Valve (EEV) and Subcooling EEV are precisely controlled. The Main EEV uses fuzzy logic to maintain a stable degree of superheat at the evaporator outlet during heating, while the Subcooling EEV maintains a stable degree of subcool at the subcooler outlet during cooling. This precise control of refrigerant flow is crucial for maximizing efficiency and preventing issues like liquid floodback to the compressor.
The system incorporates advanced protection controls to safeguard its components and ensure reliable operation. These include pressure protection controls for both high and low pressures in cooling and heating modes, discharge temperature control to prevent compressor overheating, and inverter protection control to manage current draw and prevent damage to the inverter compressor.
The Multi V IV system offers several features designed to enhance user experience and system flexibility:
The Multi V IV is designed with maintenance in mind, incorporating features that facilitate diagnostics and servicing:
The LG Multi V IV system is a robust and intelligent solution for climate control, offering advanced operational features and comprehensive maintenance tools to ensure reliable and efficient performance over its lifespan.
General| Cooling Capacity | 96, 000 Btu/h |
|---|---|
| Heating Capacity | 108, 000 Btu/h |
| Refrigerant | R410A |
| Energy Efficiency Ratio (EER) | 11.0 |
| SEER | 18.0 |
| Power Input Cooling | 8.73 kW |
| Power Supply | 208-230V, 60Hz, 1Ph |
| Sound Pressure Level Cooling | 58 dB(A) |
| Operating Temp. Cooling | 14°F to 118°F |
| Operating Temp. Heating | -4°F to 75°F |
