Features - LG MULTI V 5 Engineering Manual

MECHANICAL SPECIFICATIONS
Multi V 5 Outdoor Units
Fans and Motors
All outdoor unit frames <80MBh include one direct drive, variable speed, biomimetic enhanced, propeller type fan. All outdoor unit frames
>80MBh include two direct drive, variable speed, biomimetic enhanced, propeller type fans. All fan motors have inherent protection, permanent-
ly lubricated bearings, and are variable speed with a maximum speed up to 1,150 rpm. Fan guards are provided to limit contact with moving
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Electrical
Outdoor units are available in 208-230V/60 Hz/3-phase or 460V/60 Hz/3-phase. The unit controls include current protection logic.
Controls
Outdoor units are factory wired with necessary electrical control components, integral microprocessors, printed circuit boards, thermistors,
sensors, terminal blocks, and lugs for power wiring.
The control circuit between the indoor units, heat recovery units, and outdoor unit is a variable low voltage DC communication completed
using a two conductor, stranded, and shielded cable for the RS-485 daisy chain communication wiring. Microprocessor-based algorithms
provide component protection, soft-start capability, refrigeration system pressure, temperature, defrost, and ambient control.
System Features
Advanced Smart Load Control
Automatically adjusts system target pressures based on outdoor temperature and humidity for increased cooling and heating performance.
Intelligent Heating
By monitoring the outdoor ambient humidity, the target high refrigerant pressure and compressor frequency can be reduced to extend heating
operation, delay defrost operation initialization, and reduce power consumption.
Comfort Cooling
By monitoring the indoor temperature and setpoint differential, the target indoor unit refrigerant superheat and flow rate can be adjusted for
improved comfort and cooling efficiency.
HiPOR™ (High Pressure Oil Return)
Refrigerant oil is captured from the compressor discharge by the centrifugal oil separator and then returned to the compressor through a
separate oil injection pipe, preventing efficiency loss inherent in returning oil to the suction side of the compressor.
Smart Oil Control
Actively monitors the oil level inside each compressor and only initiates an oil return cycle to flush oil in the piping system back to the com-
pressor oil sump when the oil level is too low, preventing the need for timed oil return cycles while maintaining proper oil level.
Active Refrigerant Control
Depending on the operating mode and conditions, the system refrigerant level is automatically adjusted for increased part load and heating
operation efficiency.
Variable Path Heat Exchanger
Vapor Injection
In heating mode, warm refrigerant vapor discharged by the subcooling heat exchanger is injected into the compressor scroll chamber, im-
proving heating performance at low outdoor ambient conditions.
Advanced PCB Cooling
Improved cooling performance of the inverter drive control board by using liquid refrigerant instead of heat pipe or heat sink cooling methods
using outdoor fan airflow.
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