Mechanical Specifications - LG MULTI V WATER 5 ARW Series Engineering Manual

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General

An LG Multi V Water 5 variable refrigerant flow (VRF) Water Source Unit (WSU) operates

as either a heat pump or a heat recovery system. The WSU consists of a single, dual or triple

frame system connected to indoor units (IDU) (and heat recovery units for heat recovery

systems) with a single refrigerant piping system connected using factory designed and supplied

Y-branches and headers, and having integrated controls. The WSU has integrated controls and

can be operated with its control system or with a building management system.

A Multi V Water 5 heat pump and heat recovery system is a VRF system that can operate in

either heat pump mode (cooling or heating) or heat recovery mode (with indoor units in cooling

or heating modes simultaneously).

The heat recovery unit is capable of being designed for minimum piping and maximum design

flexibility. Individual indoor units or zones can change modes (cooling to heating or heating

to cooling) within a maximum time of three (3) minutes to ensure indoor temperature can be

properly maintained.

HRUs allow minimum piping and maximum design flexibility. Every indoor unit or zone of a

heat recovery system is independently capable of operating in either heating or cooling mode

regardless of the mode of other indoor units. The system ensures properly maintained indoor

temperature by changing the mode of individual indoor units or zones (cooling to heating or

heating to cooling) within a maximum time of three (3) minutes.

LG components are manufactured in a facility meeting International Organization for Standard-

ization (ISO) 9001 and ISO 14001 standards. ISO 9001 defines quality management and ISO

14001 defines environmental management. The units are listed by Intertek Electrical Testing

Laboratories (ETL) and bear the CSA Group (CSA) label. Wiring in these units are in

accordance with the National Electrical Code (NEC).

Temperature Ranges

Heat pump or heat recovery systems

Water Source Units can operate in cooling, heating, or synchronous mode with entering water temperatures (EWT) of 50°F to 113°F.

Casing / Frame

Water Source Units are constructed with galvanized steel, bonderized and finished with powder coat baked enamel paint. Each frame has a

removable inspection panel to allow access to service tool connection, DIP switches, auto addressing, and error code display without

removing the entire front panel. The entire front panel of the WSU is removable for maintenance.

WSU frames are completely factory assembled, piped and wired. Dual and triple frame WSUs must be field piped with factory designed and

supplied Y-branch kits to manifold them together into a single refrigerant circuit.

Refrigerant System

The refrigeration system is a single refrigeration circuit using R410A refrigerant. The WSU is provided with factory-installed components

including refrigerant sensors, check valves, oil separator, accumulator, hot gas bypass valve, four-way reversing valve, electronic controlled

expansion valve (EEV), high and low side charging ports, high pressure safety switch, service valves, and interconnecting piping. Also

included is an integral subcooler assembly consisting of a double spiral tube-type subcooling heat exchanger and EEV providing refrigerant

subcooling modulation up to 25ºF.