LG HM143M.U32 User manual

Brand: LG

Model: HM143M.U32

Type: User manual

www.lg.com

Please read this installation manual completely before installing the product.

Installation work must be performed in accordance with the national wiring standards

by authorized personnel only.

Please retain this installation manual for future reference after reading it thoroughly.

Air-to-Water Heat Pump

Original instruction

[

Representative

] LG Electronics Inc. EU Representative : LG Electronics European Shared

Service Center B.V. Krijgsman 1, 1186 DM Amstelveen, The Netherlands

[Manufacturer] LG Electronics Inc. Changwon 2nd factory 84, Wanam-ro, Seongsan-gu,

Changwon-si, Gyeongsangnam-do, KOREA

For more information, Refer to the CD or LG Web site (www.lg.com).

INSTALLATION MANUAL

AIR

CONDITIONER

P/NO : MFL68026603

ENGLISH

ITALIANO ESPAÑOL

FRANÇAIS

DEUTSCH

ΕΛΛΗΝΙΚΆ

ČEŠTINA

NEDERLANDS

POLSKI

LIMBA ROMÂNĂ

2 Air-to-Water Heat Pump

Air-to-Water Heat Pump Installation Manual

TABLE OF CONTENTS

1. SAFETY PRECAUTIONS..............................................................................................................3

2. INSTALLATION PARTS ................................................................................................................8

3. GENERAL INFORMATION ..........................................................................................................9

MODEL INFORMATION................................................................................................................9

COMPONENTS ..........................................................................................................................10

ACCESSORIES ..........................................................................................................................13

4. INSTALLATION ...........................................................................................................................15

TRANSPORTING THE UNIT ......................................................................................................15

SELECTION OF THE BEST LOCATION ....................................................................................16

INSTALLATION CONDITIONS....................................................................................................17

INSTALLATION AT SEASIDE......................................................................................................18

SEASONAL WIND AND CAUTIONS IN WINTER.......................................................................18

FOUNDATION FOR INSTALLATION ..........................................................................................19

INSTALLATION SCENES ...........................................................................................................20

WATER PIPING AND WATER CIRCUIT CONNECTION............................................................23

WATER VOLUME AND EXPANSION VESSEL PRESSURE......................................................27

ELECTRICAL WIRING................................................................................................................28

CONNECTING CABLES.............................................................................................................30

WIRING OF MAIN POWER SUPPLY AND EQUIPMENT CAPACITY ........................................35

WATER CHARGING ...................................................................................................................36

INSTALLATION OF THE FINAL CHECK ....................................................................................37

5. ACCESSORIES INSTALLATION ................................................................................................38

INSTALLATION OF REMOTE CONTROLLER ...........................................................................38

THERMOSTAT ............................................................................................................................40

SANITARY WATER TANK AND SANITARY WATER TANK KIT .................................................44

DRY CONTACT...........................................................................................................................47

REMOTE TEMPERATURE SENSOR.........................................................................................48

3WAY VALVE ..............................................................................................................................49

AIR-VENT ...................................................................................................................................50

2WAY VALVE ..............................................................................................................................51

6. SYSTEM SET-UP ........................................................................................................................52

DIP SWITCH SETTING...............................................................................................................52

INSTALLER SETTING ................................................................................................................56

7. CHECK POINTS, MAINTENANCE AND TROUBLESHOOTING ..............................................71

CHECK LIST BEFORE STARTING OPERATION ......................................................................71

MAINTENANCE ..........................................................................................................................72

TEST RUN ..................................................................................................................................72

AIRBORNE NOISE EMISSION ..................................................................................................73

LIMITING CONCENTRATION ....................................................................................................73

VACUUM & CHARGE OF REFRIGERANT ................................................................................74

TROUBLESHOOTING ................................................................................................................77

Safety Precautions

Installation Manual 3

ENGLISH

1. Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must be

followed.

Be sure to read before installing the unit.

Be sure to observe the cautions specified here as they include important items related to safety.

Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified

by the following indications.

n Meanings of symbols used in this manual are as shown below.

WARNING

CAUTION

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

Be sure not to do.

Be sure to follow the instruction.

WARNING

n Installation

Do not use a defective

or underrated circuit

breaker. Use this

appliance on a

dedicated circuit.

• There is risk of fire or

electric shock.

For electrical work,

contact the dealer,

seller, a qualified

electrician, or an

Authorized Service

Center.

• There is risk of fire or

electric shock.

Always ground the unit.

• There is risk of fire or

electric shock.

Install the panel and

the cover of control

box securely.

• There is risk of fire or

electric shock.

Always install a

dedicated circuit and

breaker.

• Improper wiring or

installation may cause

fire or electric shock.

Use the correctly rated

breaker or fuse.

• There is risk of fire or

electric.

4 Air-to-Water Heat Pump

Safety Precautions

Do not install the water

pipe system as Open

loop type.

• It may cause failure of

unit.

Use a vacuum pump or

inert (nitrogen) gas

when doing leakage

test or purging air. Do

not compress air or

oxygen and do not use

flammable gases.

• There is the risk of

death, injury, fire or

explosion.

Make sure the

connected condition of

connector in product

after maintenance.

• Otherwise, it may cause

product damage.

Do not touch leaked refrigerant directly.

• There is risk of frostbite.

Take care to ensure

that power cable could

not be pulled out or

damaged during

operation.

• There is risk of fire or

electric shock.

Do not place anything

on the power cable.

• There is risk of fire or

electric shock.

Do not plug or unplug

the power supply plug

during operation.

• There is risk of fire or

electric shock.

n Operation

For installation, always

contact the dealer or an

Authorized Service

Center.

• There is risk of fire,

electric shock, explosion,

or injury.

Do not install the unit

on a defective

installation stand.

• It may cause injury,

accident, or damage to

the unit.

Be sure the installation

area does not

deteriorate with age.

• If the base collapses, the

unit could fall with it,

causing property

damage, unit failure, and

personal injury.

Do not modify or

extend the power cable.

• There is risk of fire or

electric shock.

Do not install, remove,

or reinstall the unit by

yourself (customer).

• There is risk of fire,

electric shock, explosion,

or injury.

For antifreeze, always

contact the dealer or an

authorized service

center.

• Almost the antifreeze is a

toxic product.

Safety Precautions

Installation Manual 5

ENGLISH

Do not touch (operate)

the unit with wet hands.

• There is risk of fire or

electric shock.

Do not place a heater

or other appliances

near the power cable.

• There is risk of fire or

electric shock.

Do not allow water to

run into electric parts.

• There is risk of fire,

failure of the unit, or

electric shock.

Do not store or use

flammable gas or

combustibles near the

unit.

• There is risk of fire or

failure of unit.

Do not use the unit in a

tightly closed space for

a long time.

• It may cause damage to

the unit.

When flammable gas

leaks, turn off the gas

and open a window for

ventilation before

turning the unit on.

• There is risk of explosion

or fire.

If strange sounds, or

small or smoke comes

from unit, turn the

breaker off or

disconnect the power

supply cable.

• There is risk of electric

shock or fire.

Stop operation and

close the window in

storm or hurricane. If

possible, remove the

unit from the window

before the hurricane

arrives.

• There is risk of property

damage, failure of unit,

or electric shock.

Do not open the front

cover of the unit while

operation. (Do not

touch the electrostatic

filter, if the unit is so

equipped.)

• There is risk of physical

injury, electric shock, or

unit failure.

Do not touch any

electric

part with wet hands.

you should be power

off before touching

electric part.

• There is risk of electric

shock or fire.

Do not touch

refrigerant pipe and

water pipe or any

internal parts while the

unit is operating or

immediately after

operation.

• There is risk of burns or

frostbite, personal injury.

If you touch the pipe or

internal parts, you

should be wear

protection or wait time

to return to normal

temperature.

• Otherwise , it may cause

burns or frostbite,

personal injury.

6 Air-to-Water Heat Pump

Ventilate the unit from

time to time when

operating it together

with a stove, etc.

• There is risk of fire or

electric shock.

Turn the main power off

when cleaning or

maintaining the unit.

• There is risk of electric

shock.

Take care to ensure

that nobody could step

on or fall onto the unit.

• This could result in

personal injury and unit

damage.

For installation, always

contact the dealer or an

Authorized Service

Center.

• There is risk of fire,

electric shock, explosion,

or injury.

If the unit is not used

for long time, we

strongly recommend

not to switch off the

power supply to the

unit.

• There is risk of water

freezing.

Be careful that some

part of the control box

are hot.

• There is risk of physical

injury or burns.

When the unit is

soaked (flooded or

submerged), contact an

Authorized Service

Center.

• There is risk of fire or

electric shock.

Be cautious that water

could not be poured to

the unit directly.

• There is risk of fire,

electric shock, or unit

damage.

Turn the main power on

6 hours ago before the

product starting

operation.

• Otherwise, it may cause

compressor damage.

Do not touch electric

parts for 10 minutes

after main power off.

• There is risk of physical

injury, electric shock.

The inside heater of

product may operate

during stop mode. It is

intended to protect the

product.

Safety Precautions

Installation Manual 7

ENGLISH

n Installation

Always check for gas

(refrigerant) leakage

after installation or

repair of unit.

• Low refrigerant levels

may cause failure of unit.

Keep level even when

installing the unit.

• To avoid vibration or

water leakage.

Use two or more people

to lift and transport the

unit.

• Avoid personal injury.

n Operation

Do not use the unit for

special purposes, such

as preserving foods,

works of art, etc.

• There is risk of damage

or loss of property.

Use a soft cloth to

clean. Do not use harsh

detergents, solvents,

etc.

• There is risk of fire,

electric shock, or

damage to the plastic

parts of the unit.

Do not step on or put

anything on the unit.

• There is risk of personal

injury and failure of unit.

CAUTION

Use a firm stool or ladder when

cleaning or maintaining the unit.

• Be careful and avoid personal injury.

Do not turn on the breaker or power

under condition that front panel,

cabinet, top cover, control box cover

are removed or opened.

• Otherwise, it may cause fire, electric

shock, explosion or death.

Safety Precautions

Installation Parts

8 Air-to-Water Heat Pump

2. Installation Parts

Before starting installation, please make it sure that all parts are found inside the unit box.

Item Image Quantity

Installation Manual

Owner's Manual 1

Remote Controller 1

Cable 1

www.lg.com

Air-to-Water Heat Pump

Please read this installation manual completely before installing the product.

Installation work must be performed in accordance with the national wiring

standards by authorized personnel only.

Please retain this installation manual for future reference after reading it

thoroughly.

INSTALLATION MANUAL

AIR

CONDITIONER

P/NO : MFL68026603

Original instruction

ENGLISH

ITALIANO ESPAÑOL

FRANÇAIS

DEUTSCH

ΕΛΛΗΝΙΚΆ

ČEŠTINA

NEDERLANDS

POLSKI

LIMBA ROMÂNĂ

www.lg.com

P/NO : MFL67212706

Please read this manual carefully before operating your set and retain it for future

reference.

Air-to-Water Heat Pump (For High Temperature)

OWNER’S MANUAL

AIR

CONDITIONER

ENGLISH FRANÇAIS

ΕΛΛΗΝΙΚΆ

PORTUGUÊS

Installation Manual 9

ENGLISH

General Information

3. General Information

Model Information

With advanced inverter technology, is suitable for applications like under floor heating,

under floor cooling, and hot water generation. By Interfacing to various accessories user can

customize the range of the application.

In this chapter, general information of is presented to identify the installation

procedure. Before beginning installation, read this chapter carefully and find helpful information on

installation.

Model name and related information

* : tested under Eurovent Heating condition (inlet Water temperature 30 °C ’ 35 °C at outdoor

ambient temperature 7 °C DB/ 6 °C WB)

** : tested under Eurovent Cooling condition (inlet Water temperature 23 °C ’ 18 °C at outdoor

ambient temperature 36 °C DB/ 24 °C WB)

Unit

Capacity

Power Source (Unit) Chassis

Heating (kW)* Cooling (kW)**

AHBW056A0 4.99 4.99 220-240 V~ 50 Hz UN4

AHBW076A0 7.00 7.00 220-240 V~ 50 Hz UN4

AHBW096A0 9.00 9.00 220-240 V~ 50 Hz UN4

AHBW126A0 12.00 14.50 220-240 V~ 50 Hz UN3

AHBW146A0 14.00 15.50 220-240 V~ 50 Hz UN3

AHBW166A0 16.00 16.10 220-240 V~ 50 Hz UN3

AHBW128A0 12.00 14.50 380·415 V ~50 Hz UN3

AHBW148A0 14.00 15.50 380·415 V ~50 Hz UN3

AHBW168A0 16.00 16.10 380·415 V ~50 Hz UN3

General Information

10 Air-to-Water Heat Pump

Components

9 8

1 2

Description

No Name Remarks

1 Entering water pipe PT 25.4mm(Female type)

2 Leaving water pipe PT 25.4mm(Female type)

3 Strainer Filtering and stacking particles inside circulating water

4 Electronic heater Providing additional heating capacity to the water circuit

5 Control box PCB and terminal blocks

6 Plate heat exchanger Heat exchange between refrigerant and water

7 Water pump Circulating the water

8 Pressure gage Indicates circulating water pressure

9 Safety valve Open at water pressure 3 bar

10 Expansion vassel Protecting components from water pressure

Main PCB assembly(Inverter)

This PCB controls the cycle parts of the unit

Main PCB assembly(Heater)

This PCB controls the functioning of the unit

AHBW056A0/AHBW076A0/AHBW096A0

General Information

Installation Manual 11

ENGLISH

1 2

Description

No Name Remarks

1 Entering water pipe PT 25.4mm(Female type)

2 Leaving water pipe PT 25.4mm(Female type)

3 Strainer Filtering and stacking particles inside circulating water

4 Electronic heater Providing additional heating capacity to the water circuit

5 Control box PCB and terminal blocks

6 Plate heat exchanger Heat exchange between refrigerant and water

7 Water pump Circulating the water

8 Pressure gage Indicates circulating water pressure

9 Safety valve Open at water pressure 3 bar

10 Expansion vassel Protecting components from water pressure

Main PCB assembly(Inverter)

This PCB controls the cycle parts of the unit

Main PCB assembly(Heater)

This PCB controls the functioning of the unit

AHBW126A0/AHBW146A0/AHBW166A0

General Information

12 Air-to-Water Heat Pump

1 2

Description

No Name Remarks

1 Entering water pipe PT 25.4mm(Female type)

2 Leaving water pipe PT 25.4mm(Female type)

3 Strainer Filtering and stacking particles inside circulating water

4 Electronic heater Providing additional heating capacity to the water circuit

5 Control box PCB and terminal blocks

6 Plate heat exchanger Heat exchange between refrigerant and water

7 Water pump Circulating the water

8 Pressure gage Indicates circulating water pressure

9 Safety valve Open at water pressure 3 bar

10 Expansion vassel Protecting components from water pressure

Main PCB assembly(Inverter)

This PCB controls the cycle parts of the unit

Main PCB assembly(Heater)

This PCB controls the functioning of the unit

AHBW128A0/AHBW148A0/AHBW168A0

General Information

Installation Manual 13

ENGLISH

Accessories

Accessories supported by LG Electronics

To extend the functionality of , there are various external auxiliary apparatus called as

“accessories”.

They are classified by "accessories" and "3

party accessories" according to the manufacturer.

Accessories are presented LG Electronics, and 3

party accessories are presented by related

manufacturers.

Item Purpose

Model

Sanitary water tank kit

To operate with

sanitary water tank

PHLTB

Remote air sensor

To control by air

temperature

PQRSTA0

Dry contact

To receive on & off

external signal

PQDSA

Sanitary water tank

To generate and store

hot water

PHS02060310 : 200 liter, Single heating

coil, 230 V~ 50 Hz 3 kW

Electric heater

PHS02060320 : 200 liter, Double heating

coil, 230 V~ 50 Hz 3 kW

Electric heater

PHS03060310 : 300 liter, Single heating

coil, 230 V~ 50 Hz 3 kW

Electric heater

PHS03060320 : 300 liter, Double heating

coil, 230 V~ 50 Hz 3 kW

Electric heater

General Information

14 Air-to-Water Heat Pump

Accessories supported by 3

party Companies

Item Purpose Specification

Thermostat To control by air temperature

Heating-Only type (230 V~)

Cooling / Heating type

(230 V~ with

mode selection switch)

3way valve and

actuator

To control water flow for hot

water heating or floor heating

3 wire, SPDT (Single Pole

Double Throw) type, 230 V~

2way valve and

actuator

To control water flow

for Fan Coil Unit

2 wire,NO(Normal Open)

or NC(Normal Closed)

type, 230 V~

Solar Heating System

To generate auxillary

heating energy for water tank

Installation

Installation Manual 15

ENGLISH

4. Installation

Transporting the Unit

• When carrying the suspended unit, pass the ropes between legs of base panel under the unit.

• Always lift the unit with ropes attached at four points so that impact is not applied to the unit.

• Attach the ropes to the unit at an angle Ⓐ of 40° or less.

• Use only accessories and parts which are of the designated specification when installing.

Sub line

40º or less

Locking points for

transportation ropes

Air outlet grille Intake hole

Corner

Handle

Forklift

Always hold the unit by the corners, as holding

it by the side intake holes on the casing may

cause them to deform.

Installation

16 Air-to-Water Heat Pump

Selection of The Best Location

1. Select space for installing unit, which will meet the following conditions:

• No direct thermal radiation from other heat sources

• No possibility of annoying neighbors by noise from unit

• No exposition to strong wind

• With strength which bears weight of unit

• Note that drain flows out of unit when heating

• With space for air passage and service work shown next

• Because of the possibility of fire, do not install unit to the space where generation, inflow,

stagnation, and leakage of combustible gas is expected.

• Avoid unit installation in a place where acidic solution and spray (sulfur) are often used.

• Do not use unit under any special environment where oil, steam and sulfuric gas exist.

• It is recommended to fence round the unit in order to prevent any person or animal from

accessing the unit.

• If installation site is area of heavy snowfall, then the following directions should be observed.

- Make the foundation as high as possible.

- Fit a snow protection hood.

2. Select installation location considering following conditions to avoid bad condition when

additionally performing defrost operation.

• Install the unit at a place well ventilated and having a lot of sunshine in case of installing the

product at a place with a high humidity in winter (near beach, coast, lake, etc).

(Ex) Rooftop where sunshine always shines.

• Performance of heating will be reduced and preheat time of the unit may be lengthened in

case of installing the unit in winter at following location:

- Shade position with a narrow space

- Location with much moisture in neighboring floor.

- Location with much humidity around.

- Location where ventilation is good.

It is recommended to install the unit at a place with a lot of sunshine as possible as.

- Location where water gathers since the floor is not even.

3. When installing the unit in a place that is constantly exposed to a strong wind like a coast or on

a high story of a building, secure a normal fan operation by using a duct or a wind shield.

• Install the unit so that its discharge port faces to the wall of the building.

Keep a distance 300mm or more between the unit and the wall surface.

• Supposing the wind direction during the operation season of the air conditioner, install the

unit so that the discharge port is set at right angle to the wind direction.

Be very careful while carrying the unit.

- Do not have only one person carry the unit if it is more than 20 kg (44.1 lbs).

- PP bands are used to pack some products. Do not use them as a mean for transportation because

they are dangerous.

Do not touch heat exchanger fins with your bare hands. Otherwise you may get a cut in your hands.

- Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic

packaging bag may suffocate children to death.

- When carrying the unit, be sure to support it at 4-points. Carrying and lifting the unit with 3-point

support may make it unstable, resulting in a fall.

CAUTION

Installation

Installation Manual 17

ENGLISH

General considerations

• If a sunroof is built over the unit to prevent

direct sunlight or rain exposure, make sure

that heat radiation from the heat exchanger is

not restricted.

• Ensure that the spaces indicated by arrows

around front, back and side of the unit.

• Do not place animals and plants in the path of

the warm air.

• Take the weight of the unit into account and

select a place where noise and vibration are

minimum.

• Select a place so that the warm air and noise

from the unit do not disturb neighbors.

• The surface of the ground or the structure

must be strong enough to bear the weight of

the unit.

Installation Conditions

More than

300mm

Fence or

obstacles

More than 700mm

More than 600mm

*Minimum *Minimum

300mm300mm

Sunroof

*Minimum

300mm

* : Please secure the space to install the shut-off

valve and strainer.

Installation

18 Air-to-Water Heat Pump

Installation at Seaside

Seasonal Wind and Cautions in Winter

• Sufficient measures are required in a snow area or severe cold area in winter so that unit can be operated well.

• Get ready for seasonal wind or snow in winter even in other areas.

• Install a suction and discharge duct not to let in snow or rain.

• Install the unit not to come in contact with snow directly. If snow piles up and freezes on the air suction hole,

the system may malfunction. If it is installed at snowy area, attach the hood to the system.

• Install the unit at the higher installation console by 500mm than the average snowfall (annual average snowfall)

if it is installed at the area with much snowfall.

•

Where snow accumulated on the upper part of the unit by more than 100mm, always remove snow for operation.

1. The height of H frame must be more than 2 times the snowfall and its width shall not exceed the width of

the unit. (If width of the frame is wider than that of the unit, snow may accumulate.)

2. Don't install the suction hole and discharge hole of the unit facing the seasonal wind.

Selecting the location

1) If the unit is to be installed close to the seaside, direct exposure to the sea wind should be avoided.

Install the unit on the opposite side of the sea wind direction.

- It should be strong enough like concrete to

prevent the sea wind from the sea.

- The height and width should be more than 150%

of the unit.

- It should be keep more than 700 mm of space

between unit and the windbreak for easy air

flow.

2) In case, to install the unit on the seaside, set up a windbreak not to be exposed to the sea wind.

3) Select a well-drained place.

CAUTION

Unit should not be installed in areas where corrosive gases, such as acid or alkaline gas, are produced.

2. Do not install the unit where it could be exposed to sea wind (salty wind) directly. It can result

corrosion on the unit. Corrosion, particularly on the condenser and evaporator fins, could cause

unit malfunc-tion or inefficient performance.

3. If unit is installed close to the seaside, it should avoid direct exposure to the sea wind. Otherwise

itneeds additional anticorrosion treatment on the heat exchanger.

Sea wind Sea wind

Sea wind

Windbreak

1. If you can’t meet above guide line in the seaside installation, please contact your supplier

for the additional anticorrosion treatment.

2. Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat

exchanger by using water

Installation

Installation Manual 19

ENGLISH

Foundation for Installation

[Unit:mm]

Foundation bolt executing method

200

1012

361

Nut

200

Spring washer

Frame

Anti-vibration

materials

Four bolt are

required

3 thread ridges

H-Beam

Concrete

base

100

• Check the strength and level of the installation ground so that the unit will not cause any

operating vibration or noise after installation.

• Fix the unit securely by means of the foundation bolts. (Prepare 4sets of M12 foundation

bolts, nuts and washers each which are available on the market.)

• It is best to screw in the foundation bolts until their length are 20mm from the foundation

surface.

Pallet(Wood Support)

- Remove before Installation

WARNING

• Be sure to remove the Pallet(Wood Support)

of the bottom side of the unit Base Pan before

fixing the bolt. It may cause the unstable state

of the unit settlement, and may cause freezing

of the heat exchanger resulting in abnormal

operations.

• Be sure to remove the Pallet(Wood Support)

of the bottom side of the unit before welding.

Not removing Pallet(Wood Support) causes

hazard of fire during welding.

Installation

20 Air-to-Water Heat Pump

If is installed with pre-existing boiler, the boiler and should not be operated together. If

entering water temperature of is above 55 °C, the system will stop operation to

prevent mechanical damage of the unit. For detailed electric wiring and water piping, please contact

authorized installer.

Some installation scenes are presented for example. As these scenes are conceptual figures,

installer should optimize the installation scene according to the installation conditions.

CASE 1: Connecting heat emitters for heating and cooling

(Under floor loop, Fan coil unit, and Radiator)

Outdoor Indoor

Floor heating loopFan coil unit

Radiator

Room thermostat(field supply)

2way valve

(field supply)

By-pass valve(field supply)

Strainer (Mesh: 1 mm × 1 mm)

Remote controller

Air vent

Shut-off valve(field supply)

Installation Scenes

Note:

• Room thermostat

- Type of thermostat and specification should be complied with chapter 5 of the installation

manual.

• 2way valve

- It is important to install 2way valve to prevent dew condensation on the floor and radiator while

cooling mode.

- Type of 2way valve and specification should be complied with chapter 5 of the installation

manual.

- 2way valve should be installed at the supply side of the collector.

• By-pass valve

- To secure enough water flow rate, by-pass valve should be installed at the collector.

- By-pass valve should guarantee minimum water flow rate in any case. Minimum water flow rate

is described in water pump characteristics curve.

CAUTION

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LG HM143M.U32 User manual

LG HM143M.U32 User manual

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