LG MULTI V WATER MINI Manuale di installazione e funzionamento

ENGINEERING MANUAL

Variable Refrigerant Flow

Water-Source Units

4.4 Tons

A summary list of safety precautions is on page 3.

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.

PROPRIETARY DATA NOTICE

This document, as well as all reports, illustrations, data, information, and

other materials are the property of LG Electronics U.S.A., Inc., and are

disclosed by LG Electronics U.S.A., Inc. only in confidence.

This document is for design purposes only.

To access additional technical documentation such as submittals,

indoor unit engineering manuals, installation, service, product

data performance, general best practice, and building ventilation

manuals, as well as whitepapers, catalogs, LATS software

programs, and more, log in to www.lghvac.com.

TABLE OF SYMBOLS

DANGER

This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

This symbol indicates situations that may result in equipment or property damage accidents only.

This symbol indicates an action that should not be performed.

TABLE OF CONTENTS

Unit Nomenclature��4

LG Air Conditioner Technical Solution (LATS) ��5-6

Rrefrigerant Charge Worksheet ��7

Water Source Product Data ��8-20

Mechanical Specications ............................................................................................................................................................................................9

Product Features and Benets...................................................................................................................................................................................10

General Data .............................................................................................................................................................................................................. 11

Electrical Data ............................................................................................................................................................................................................ 11

Dimensions.................................................................................................................................................................................................................12

Wiring Diagram...........................................................................................................................................................................................................13

Refrigerant Flow Diagrams....................................................................................................................................................................................14-16

Acoustic Data .............................................................................................................................................................................................................17

Accessories ...........................................................................................................................................................................................................18-20

Performance Data��21-33

Cooling Capacity ...................................................................................................................................................................................................22-27

Heating Capacity ................................................................................................................................................................................................. 28-33-

Correction Factors ��34-36

Electrical Connections��37-40

Power Wiring and Communication Cable..............................................................................................................................................................38-39

DIP Switch Settings for Use With Gen4 Indoor Units.................................................................................................................................................40

Water Circuit Installation ��41-57

Water Circuit Design..............................................................................................................................................................................................42-43

Piping System Specications ................................................................................................................................................................................44-47

Flow Switches and Solenoid Valves ......................................................................................................................................................................48-49

Variable Water Flow Control Kit (Required Accessory)..........................................................................................................................................50-57

Refrigerant Piping Design ��58-64

Piping Limitations .......................................................................................................................................................................................................59

Pipe Sizing.............................................................................................................................................................................................................60-62

Placement Considerations.....................................................................................................................................................................................63-64

Due to our policy of continuous product innovation, some specifications may change without notification.

4|INTRODUCTION

MULTI V Water Mini Unit Engineering Manual

058 G A

Type

N = Heat Pump

Electrical Ratings

G = 208–230V / 60Hz / 1Ø

053 = 52,900

Condenser

W = Water Source

Family

AR = Multi V (Refrigerant R410A)

2

Basic Function = A

Generation

2 = Second

Water Source Units (WSU)

AR W N

UNIT NOMENCLATURE

Water Mini Unit

Nominal Cooling Capacity in Btu/h

Due to our policy of continuous product innovation, some specifications may change without notification.

Introduction

LG AIR CONDITIONER

TECHNICAL SOLUTION (LATS)

Figure 1: Example of LATS CAD2.

LG Air Conditioner Technical Solution (LATS) Software

A properly designed and installed refrigerant piping system is critical to the optimal performance of LG air-conditioning systems. To assist

engineers, LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning

systems.

To reduce the risk of designing an improper applied system or one that will not operate correctly, LG requires that LATS software be used on all projects.

Formats

LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS REVIT. All three LATS formats are available

through www.myLGHVAC.com, or contact an LG Sales Representative.

LATS HVAC is a Windows®-based application that aids engineers in designing LG Variable Refrigerant Flow (VRF), Multi F / Multi F MAX,

Single-Zone, and Energy Recovery Ventilator (ERV) systems.

*Windows® is a registered mark of Microsoft®Corporation.

LATS CAD2 combines the LG LATS program with AutoCAD®software**. It permits engineers to layout and validate LG Multi V Variable

Refrigerant Flow (VRF), Multi F / Multi F MAX, Single-Zone, and En-

ergy Recovery Ventilator (ERV) systems directly into CAD drawings.

LATS Revit integrates the LG LATS program with Revit®software**.

It permits engineers to layout and validate Multi V VRF systems

directly into Revit drawings.

**AutoCAD®and Revit®are both registered marks of Autodesk, Inc.

Features

All LG product design criteria have been loaded into the program,

making LATS simple to use: double click or drag and drop the com-

ponent choices. Build systems in Tree Mode where the refrigerant

system can be viewed. Switch to a Schematic diagram to see the

electrical and communications wiring.

LATS software permits the user to input region data, indoor and

outdoor design temperatures, modify humidity default values, zoning, specify type and size of outdoor units and indoor units, and input air

flow and external static pressure (ESP) for ducted indoor units.

The program can also:

•Import building loads from a separate Excel file.

•Present options for outdoor unit auto selection.

•Automatically calculate component capacity based on design

conditions for the chosen region.

•Verify if the height differences between the various system

components are within system limits.

•Provide the correct size of each refrigerant piping segment and LG

Y-Branches and Headers.

•Adjust overall piping system length when elbows are added.

•Check for component piping limitations and flag if any parameters

are broken.

•Factor operation and capacity for defrost operation.

•Calculate refrigerant charge, noting any additional trim charge.

•Suggest accessories for indoor units and outdoor units.

•Run system simulation.

Features depend on which LATS program is being used, and the type of system being designed.

Due to our policy of continuous product innovation, some specifications may change without notification.

6|INTRODUCTION

MULTI V Water Mini Unit Engineering Manual

LG AIR CONDITIONER

TECHNICAL SOLUTION (LATS)

Figure 2: Example of a LATS Tree Diagram.

LATS Generates a Complete Project Report

LATS software also generates a report containing project design parameters, cooling and heating design data, system component perfor-

mance, and capacity data. The report includes system combination ratio and refrigerant charge calculations; and provides detailed bill of

material, including outdoor units, indoor units, control devices, accessories, refrigerant pipe sizes segregated by building, by system, by pipe

size, and by pipe segments. LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.

Proper Design to Install Procedure

LG encourages a two report design-to-install-procedure. After the

design engineer determines building / zone loads and other details,

the engineer opens the LATS program and inputs the project’s infor-

mation. When the design is complete, the “Auto Piping” and “System

Check” functions must be used to verify piping sizes, limitations, and

if any design errors are present. If errors are found, engineers must

adjust the design, and run Auto Piping and System Check again.

When the design passes the checks, then the engineer prints out

a project “Shop Drawing” (LATS Tree Diagram) and provides it to

the installing contractor. The contractor must follow the LATS Tree

Diagram when building the piping system, but oftentimes the design

changes on the building site:

•Architect has changed location and/or purpose of room(s).

•Outdoor unit cannot be placed where originally intended.

•Structural elements prevent routing the piping as planned.

•Air conditioning system conflicts with other building systems

(plumbing, gas lines, etc.).

The contractor must mark any deviation from the design on the Shop Drawing, including as-built straight lines and elbows. This “Mark Up”

drawing must be returned to the design engineer or Rep, who must input contractor changes into the LATS file. (Copy the original LATS soft-

ware file, save and rename as a separate file, and modify all piping lengths by double-clicking on each length and editing information.) Like

the shop drawing, the Auto Piping and System Check must also be run on this new “As Built” drawing. The design engineer or Rep must then

provide the final As Built file to the contractor. The Mark Up version must be compared to the As Built version for:

•Differences in pipe diameter(s). If incorrect diameters have been installed, the piping must be changed out. If pipe diameters have changed,

check to see if Y-Branches will also need to be changed.

•Changes to outdoor unit and indoor unit capacities. Capacities changes will impact line length changes.

•Additional refrigerant charge quantity (“Trim Charge”). Trim charge will change if piping lengths and diameters change. The As Built version

must reflect installed piping lengths to ensure correct trim charge.

All documents submitted by the contractor, as well as the Shop Drawing and the As Built Drawing files must be provided for commissioning

purposes. Model and serial numbers for all system components must also be submitted. If the steps previously detailed are not followed, and

all documents are not provided to the commissioning agent, the project runs the risk of not being commissioned and any warranty LG offers

on the equipment not being activated.

Any eld changes, such as re-routing, shortening or lengthening a pipe segment, adding or eliminating elbows and/or ttings, re-sizing,

adding, or eliminating indoor units, changing the mounting height, or moving the location of a device or tting during installation must be

done with caution and ALWAYS VERIFIED in LATS SOFTWARE BEFORE supplies are purchased or installed. Doing so will lead to a more

protable installation, reduce the potential for rework, and will reduce the potential for multiple visits to the job site to complete the system

commissioning.

Due to our policy of continuous product innovation, some specifications may change without notification.

Introduction

REFRIGERANT CHARGE WORKSHEET

System R410A Refrigerant Charge Calculator (lbs.)

Table 1: System Refrigerant Charge Calculator (lbs.).

1CF (Ref.) = Correction Factor for Refrigerant Charge.

2For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).

System Tag or ID:

Job Name: __________________________________________

Project Manager: ____________________________________ Date: ______________

Line # Description Chassis I.D. Size Quantity CF (Ref.)1Total (lbs.)

1 Linear feet of 1/4" liquid line tubing2— — 0.015

2 Linear feet of 3/8" liquid line tubing2— — 0.041

3 Linear feet of 1/2" liquid line tubing2— — 0.079

4 Linear feet of 5/8" liquid line tubing2— — 0.116

5 Linear feet of 3/4" liquid line tubing2— — 0.179

6 Linear feet of 7/8" liquid line tubing2— — 0.238

7 Linear feet of 1" liquid line tubing2— — 0.323

8 Standard + Art Cool Mirror SJ, SK 5k to 15k 0.53

9 Standard + Art Cool Mirror SJ, SK 18k to 24k 0.62

10 Standard SV 30k to 36k 1.01

11 Art Cool Gallery SF 9k to 12k 0.22

12 1-Way Cassette TU 7k to 12k 0.44

13 1-Way Cassette TT 18k to 24k 0.64

14 2-Way Cassette TS 18k to 24k 0.75

15 4-Way 2' x 2' Cassette TR 5k to 7k 0.40

16 4-Way 2' x 2' Cassette TR 9k to 12k 0.55

17 4-Way 2' x 2' Cassette TQ 15k to 18k 0.71

18 4-Way 3' x 3' Cassette TN 7k to 24k 0.88

19 4-Way 3' x 3' Cassette TM 28k to 36k 1.08

20 4-Way 3’ x 3’ Cassette TM 42k to 48k 1.41

21 High Static Ducted M1 7k to 24k 0.57

22 High Static Ducted M2 7k to 24k 0.77

23 High Static Ducted M2 28k to 42k 1.15

24 High Static Ducted M3 28k to 54k 1.35

25 High Static Ducted B8 36k to 96k 2.20

26 Low Static Ducted, Low Static Ducted Bottom Return L1 5k to 9k 0.31

27 Low Static Ducted, Low Static Ducted Bottom Return L2 12k to 18k 0.42

28 Low Static Ducted, Low Static Ducted Bottom Return L3 21k to 24k 0.55

29 Vertical / Horizontal Air Handling Unit NJ 12k to 30k 1.04

30 Vertical / Horizontal Air Handling Unit NJ 36k 1.57

31 Vertical / Horizontal Air Handling Unit NK 42k to 54k 2.00

32 Floor Standing CE (U) 7k to 15k 0.37

33 Floor Standing CF (U) 18k to 24k 0.82

34 ADDITIONAL Refrigerant Charge Required (Sum of lines 1 – 33)

35 Water Source Unit Factory Refrigerant Charge ARWN053GA2 52,900 2.2

36 Total System Charge: Sum of Additional Refrigerant Charge Required and Total Factory Refrigerant Charge

WATER SOURCE

PRODUCT DATA

Mechanical Specifications on page 9

Product Features and Benefits on page 10

General Data on page 11

Electrical Data on page 11

Dimensions on page 12

Wiring Diagram on page 13

Refrigerant Flow Diagrams on page 14

Acoustic Data on page 17

Accessories on page 18

PRODUCT DATA | 9

Product Data

Due to our policy of continuous product innovation, some specifications may change without notification.

MECHANICAL SPECIFICATIONS

Multi V™ Water Mini Units

General

The LG Multi V Water Mini system consists of a water source unit,

one or more indoor units, integrated system controls, and intercon-

necting field-provided refrigerant pipe containing various fittings

including Y-branch and Header kits supplied by LG. LG components

are manufactured in a facility that meets or exceeds International

Organization for Standardization (ISO) 9001 and 14001. The units

are listed by Intertek (ETL) and bear the ETL label, and are certified

to AHRI Standard 1230.

Frame

The frame is constructed with galvanized steel and finished with

baked enamel paint.

Casing

The water-source unit case is constructed from 20-gauge metal,

and is cleaned and finished with baked enamel finish. Paint color is

“warm gray.”

Refrigeration System

The refrigeration system consists of a single refrigerant circuit and

uses R410A refrigerant. The water source unit is provided with

factory installed components, including a refrigerant strainer, check

valves, accumulator, hot gas bypass valve, four-way reversing valve,

electronic expansion valve (EEV), high and low side charging ports,

service valves, and interconnecting piping. The unit comes factory

charged with R410A refrigerant.

Refrigeration Oil Control

The refrigeration oil level in the compressor is maintained using

a control system. The water source unit microprocessor is

programmed to flush the refrigerant piping for a minimum period

of three (3) minutes after three (3) hours of compressor operation.

Compressor

The water source units are equipped with one hermetic, digitally

controlled, inverter driven, rotary compressor, which is manufactured

by LG. The frequency inverter is capable of providing a modulation

range from 30Hz–100Hz. The compressor motor is suction gas-

cooled and has an acceptable voltage range of ±10% of nameplate

voltage. The compressor is equipped with a crankcase heater.

An external pressure sensor and an external temperature sensor are

provided to protect the compressor from damage caused by over /

under temperature or over / under pressure conditions. The com-

pressor is provided with a positive displacement oil pump providing

sufficient oil film on all bearing surfaces across the entire inverter

modulation range. The compressor refrigerant oil is polyvinyl ether

(PVE) having no hygroscopic

properties. The compressor is

wrapped with a heat resistant,

sound attenuating blanket and

mounted on rubber isolation

grommets.

Heat Exchanger

The water heat exchanger is a

stainless steel, type SUS316,

refrigerant / water plate heat

exchanger. The heat exchanger

requires a field-provided

50 mesh strainer and water

treatment to prevent scaling

inside the heat exchanger.

Closed loop condenser water

systems are recommended to

protect the factory mounted heat

exchanger.

Controls

Water source units are factory

wired with electrical control

components, printed circuit boards, thermistors, sensors, terminal

blocks, and lugs for power wiring. The control wiring circuit is low

voltage and includes a control power transformer, fuses, and inter-

connecting wiring harness with plug connectors. Microprocessor-

based algorithms provide component protection, soft-start capability,

and refrigerant system pressure and temperature control. The unit

is designed to provide continuous compressor operation with an

entering water temperature range of 23°F to 113°F for cooling mode,

and 23°F to 113°F for heating mode (Variable water flow control kit

[PRVC1] required for all entering water temperatures; one kit per

frame) (if entering water temperature falls below 42°F, glycol must

be added to the system). When the system is started, the connected

indoor units are automatically assigned an electronic address by the

water source unit’s microprocessor. Additionally, each indoor unit is

capable of accepting a manual assignment of a secondary address

that, if used, provides unit tag identification when integrating with LG

V-Net control devices.

The water source unit microprocessor is provided with a three-digit,

LED display that communicates active system information and /

or malfunction codes. The microprocessor has an algorithm that

actively verifies the operational condition of system sensors and

thermistors. A power conditioning circuit is provided and designed

to protect the unit’s inverter compressor and controls from phase

failure, over / under-voltage condition, and to prevent transmission of

power irregularities to the supply power source.

Figure 3: Multi V Water Mini Unit.

For indoor unit guide specications, visit www.lghvac.com.

10 |PRODUCT DATA

MULTI V Water Mini Unit Engineering Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

Quiet Operation and Integrated

Controls

Low Sound Levels

LG customers often ask if the unit is running after commissioning is

complete. When Multi V Water Mini units operate fully loaded, they

are one of the quietest levels in the industry. The sound is almost

undetectable during off-peak operation.

All rotating components are soft-started by the controller using a

digitally controlled inverter, which reduces undesirable noise caused

by compressors cycling on and off.

Comfort Control at its Best

Tight temperature control through precise load matching maximizes

the time that the indoor units remove moisture. This ensures

maximum comfort!

Precision Load Matching

Unlike traditional air conditioning control systems that use

thermostatic controls to maintain room temperatures, LG Multi V

controls continuously vary the indoor unit fan speed and

refrigerant flow. The water source unit responds by varying the

compressor speed as needed to meet the indoor unit’s demand. As

a result, the Multi V Water Mini system delivers precise space tem-

perature control without overshooting the set-point. Temperature drift

in the thermal zone is minimized, because the fan speed and

refrigerant volume are controlled together precisely matching the

load.

Advanced Compressor Technology

Oil Management

The oil injection mechanism ensures a reliable oil film on moving

parts even at the lowest speeds, which enables the inverter

compressor to safely operate at speeds as low as 30 Hz. The

following oil return system brings oil back to the compressor once

the oil leaves the compressor, so oil migration is no longer a

concern.

1. The compressor discharge is specially designed to minimize the

amount of oil leaving the compressor.

2. Oil return algorithms flush the oil from the system back to the

compressor.

Inverter Driven

The rotary compressor is optimized around the R410A model to

maximize compressor efficiency, which reduces power consumption

and lowers utility bills. The latest inverter technology allows the LG

Multi V Water Mini to precisely match the load, which prevents

constant cycling and results in tight temperature control and opti-

mized efficiency. Occupants remain comfortable while utility costs

are reduced.

Simplified Installation

Cooling and heating systems that use the LG Multi V Water Mini

simplify and reduce the mechanical and control system design time.

The designer no longer has to be concerned with interconnecting

chilled water piping or air distribution duct systems, or matching and

selecting chillers, fans, air handlers, or Variable Air Volume (VAV)

boxes.

System integration with existing building management systems

(based on BACnet®or LonWorks®) has never been easier. Because

all of the Multi V Water Mini system components are engineered and

provided by LG, the system components and controls come pre-

engineered and do not need any custom programming from third-

party contractors.

Operating Range and Size

Operating Range (4�4 Tons)

The water source unit can operate from 23°F–113°F entering water

temperature in cooling mode, and 23°F–113°F entering water

temperature in heating mode (if entering water temperature falls

below 42°F, glycol must be added to the system). Variable water flow

control kit [PRVC1] required for all entering water temperatures; one

kit per frame. The connected indoor unit combination ratio range is

30%–130%.

Compact Size

Water Mini units have a 20-5/8″ H x 13-1/8″ W cabinet. Multiple units

can be stacked using an independent racking system, giving back

valuable floor space.

PRODUCT FEATURES AND BENEFITS

Multi V™ Water Mini Units Entering water temperatures below 42 require ...WIL MEN-

TION glycol here. SEE OTHER SECTIONS FOR TEXT. see

page 45.

LG MULTI V WATER MINI Manuale di installazione e funzionamento

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