LG LVN180HV4 Manuel d'utilisateur télécharger pdf (Page 73)

Mechanical Specications and Features

DUCT (LOW STATIC) INDOOR UNITS

Ceiling-Concealed Duct (Low Static)

Indoor Unit

General

All LG indoor units are factory assembled, wired, piped, and pro-

vided with a control circuit board, fan, and motor. Ceiling-Concealed

Duct (Low Static) units have a sound rating no higher than 36 dB(A)

as tested per KSA0701 ISO Standard 3745, and are designed for

low-static pressure up to 0.20″WG.

Coil

Indoor unit coils are factory built and are comprised of aluminum fins

mechanically bonded to copper tubing. Each unit has two rows of

coils, which are pressure tested at the factory. Each unit is provided

with a factory installed condensate drain pan below the coil.

Refrigerant System

System is designed for use with R410A refrigerant. The refrigeration

circuit is pressure-tested at the factory and shipped with a holding

charge of helium gas. Refrigerant pipe connections are 45° flare,

and all refrigerant lines from the outdoor unit to the indoor units must

be field insulated.

Electrical

Each indoor unit is designed to operate using 208–230/60/1 power

with voltage variances of ±10%.

Casing

The case has a low profile design with a maximum height of 7.5

inches designed to mount fully concealed above a finished ceiling in

as little as 8 inches vertical space. Casing is manufactured of gal-

vanized steel plate, and provided with hanger brackets designed to

support the weight on four corners. Unit has a front horizontal supply

air discharge outlet, and one rear horizontal return air inlet; unit is

also field-convertible for a rear bottom return.

Fan Assembly and Control

The units have at least two direct-drive, Sirocco fans made of

high strength ABS HT-700 polymeric resin that are statically and

dynamically balanced. The fans are mounted on a common brush-

less digitally controlled (BLDC) motor with permanently lubricated

and sealed ball bearings. The fan / motor assembly is mounted on

vibration-attenuating rubber grommets. Fan speed is controlled using

a microprocessor-based direct digital control algorithm. The indoor

fan has Low, Med, High, and Auto settings for Cooling mode; and

has Low, Med, High, and Auto settings for Heating mode. Each of the

settings can be field-adjusted from the factory setting (RPM / ESP).

The Auto setting adjusts the fan speed based on the difference

between the controller set-point and space temperature.

Air Filter

Return air is filtered with a factory-supplied, removable, washable

filter accessible from the rear of the indoor unit.

Microprocessor Control

The unit is provided with an integrated control panel to communicate

with the outdoor unit. All unit operation parameters are stored in non-

volatile memory residing on the unit microprocessor. The micropro-

cessor controls space temperature through using the value provided

by the temperature sensor within the indoor unit. The microprocessor

control will activate indoor unit operation when the indoor room tem-

perature falls below or rises above a setpoint temperature, at which

point, a signal is sent to the outdoor unit to begin the appropriate

mode. The microprocessor will also provide self-diagnostics and auto

restart functions. A field-supplied four-wire power / communications

cable must be installed to connect the indoor unit(s) to the outdoor

unit.

Controls

The indoor unit is supplied with an LG wired controller. Communica-

tion between the indoor units and the outdoor unit is accomplished

through 18 AWG, four-core, stranded and shielded power / communi-

cation cable.

Condensate Lift/Pump

The indoor unit is provided with an externally mounted, factory

installed and wired condensate lift/pump capable of providing a mini-

mum 27.5 inch lift from the bottom surface of the unit. Drain pump

has a safety switch to shut off the indoor unit if the condensate rises

too high in the drain pan.

Figure 95: Ceiling-Concealed Duct (Low Static) Indoor Unit.

• Inverter (Variable speed fan)

• External mounted drain pump

• Control lock function

• Auto operation

• Auto restart operation

• Dehumidification function

• Two thermistor control

• External static pressure control

• Self-diagnostics function

• Group control

• Wired thermostat included

Features

DUCT (LOW STATIC) | 73

Ceiling-Concealed Duct (Low Static)

Due to our policy of continuous product innovation, some specications may change without notication.

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LG LVN180HV4 Manuel d'utilisateur Page 73

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