LG PRHR021 INSTALLATION INSTRUCTIONS

ENGLISH ITALIANO ESPAÑOL

FRANCAIS

DEUTSCH

PORTUGUESE

РУССКИЙ ЯЗЫК

P/NO : MFL32987304

INSTALLATION MANUAL

AIR
CONDITIONER

www.lg.com

TYPE :
MODELS : PRHR Series(Heat Recovery Unit)
Original instruction

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.

2 HR Unit

PRHR Series Heat Recovery Unit Manual

TABLE OF CONTENTS

Safety Precautions .................................................................................................3

Features...................................................................................................................4

Installation Part.......................................................................................................4

Installation...............................................................................................................5

Coil Exchanging Method......................................................................................13

Installation Manual 3

ENGLISH

Safety Precautions

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must be followed.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by

the following indications.

This symbol indicates the possibility of death or serious injury.

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

Have all electric work done by a licensed electrician according
to "Electric Facility Engineering Standard" and "Interior Wire
Regulations" and the instructions given in this manual and
always use a special circuit.

• If the power source capacity is inadequate or electric work is per­formed improperly, electric shock or fire may result.

Ask the dealer or an authorized technician to install the HR
unit.

• Improper installation by the user may result in water leakage, elec­tric shock, or fire.

Always ground the product.

• There is risk of fire or electric shock.

Make the connections securely so that the outside force of the
cable may not be applied to the terminals.

• Inadequate connection and fastening may generate heat and
cause a fire.

For re-installation of the installed product, always contact a
dealer or an Authorized Service Center.

• There is risk of fire, electric shock, explosion, or injury.

Do not install, remove, or re-install the unit by yourself (cus­tomer).

• There is risk of fire, electric shock, explosion, or injury.

Do not damage or use an unspecified power cord.

• There is risk of fire, electric shock, explosion, or injury.

Do not touch the power switch with wet hands.

• There is risk of fire, electric shock, explosion, or injury.

Avoid a place where rain may enter since the HR unit is
for indoor.

• There is risk of property damage, failure of product, or elec­tric shock.

Install the HR unit at a place in which it is not affected
by operation mode changing noise.

• Installation within cell such as meeting room etc. may dis­turb business due to noise.

Always check for gas (refrigerant) leakage after installa­tion or repair of product.

• Low refrigerant levels may cause failure of product.

Keep level even when installing the product.

•

To avoid vibration or water leakage.

Securely install the cover of control box and the panel.

• If the cover and panel are not installed securely, dust or water may
enter the HR unit and fire or electric shock may result.

Be cautious when unpacking and installing the product.

• Sharp edges could cause injury. Be especially careful of the case
edges.

Safely dispose of the packing materials.

• Packing materials, such as nails and other metal or wooden parts, may cause stabs or other injuries.

• Tear apart and throw away plastic packaging bags so that children may not play with them. If children play with a plastic bag which was
not torn apart, they face the risk of suffocation.

Do not store or use flammable gas or combustibles near the
HR Unit.

• There is risk of fire or failure of product.

Use the correctly rated breaker or fuse.

• There is risk of fire or electric shock.

4 HR Unit

Features & Installation Part

Installation Part

• Installation Manual

• Hanging bolts (4 x M10 or M8, Nut(8 x M10 or M8), Flat washers(8 x M10)

• Reducers

Features

Control Box

Connection Pipe
(to outdoor unit)

Connection Pipe
(to outdoor unit)

Coil assembly, Solenoid

Connection Pipe
(to indoor unit)

Model
Max. Connectable No. of Indoor Units
Max. Connectable No. of Indoor Units of a branch
Nominal Input Cooling
Heating
Net. Weight kg
lbs
Dimensions mm
(WxHxD) Inch
Casing
Connecting Pipes Indoor Liquid Pipe [mm/inch]
side Gas Pipe [mm/inch]
Outdoor Liquid [mm/inch]
side Low Pressure [mm/inch]

High Pressure [mm/inch]
Sound Absorbing Insulation Material
Current Minimum circuit Amps(MCA)
Maximum fuse Amps(MFA)
Power Supply

PRHR021 PRHR031 PRHR041
16 24 32

8 8 8
26 40 40
26 40 40
18 20 22

39.7 44.1 48.5

801x218x617 801x218x617 801x218x617

31.5x8.6x24.3 31.5x8.6x24.3 31.5x8.6x24.3
Galvanized steel plate

Ø9.52[3/8] Ø12.7[1/2] Ø15.88[5/8]
Ø22.2[7/8] Ø28.58[1-1/8] Ø28.58[1-1/8]
Ø19.05[3/4] Ø22.2[7/8] Ø22.2[7/8]

1Ø, 220-240V, 50Hz / 1Ø, 220V, 60Hz

Ø9.52[3/8]

Ø15.88[5/8]

Polyethylene Foam

Models

Indoor unit

reducer

PRHR021

Liquid pipe

Ø6.35OD9.52

Ø6.35OD9.52

High pressure

OD19.05 Ø15.88 Ø12.7

0.2
15

Gas pipe

Low pressure

OD15.88 Ø

12.7

OD22.2 Ø19.05 Ø15.88

HR unit
reducer

PRHR031/
PRHR041

OD15.88 Ø12.7 Ø9.52

OD12.7 Ø9.52

OD22.2 Ø19.05 Ø15.88

OD15.88 Ø12.7

OD15.88 Ø12.7

OD28.58 Ø22.2 Ø19.05

OD19.05 Ø15.88

Installation Manual 5

ENGLISH

Installation

Installation

n Select installation location of the HR unit suitable for following conditions

• Avoid a place where rain may enter since the HR unit is for indoor.

• Sufficient service space must be obtained.

• Refrigerant pipe must not exceed limited length.

• Avoid a place subject to a strong radiation heat from other heat source.

• Avoid a place where oil spattering, vapor spray or high frequency electric noise is expected.

• Install the unit at a place in which it is not affected by operation noise. (Installation within cell such as meeting
room etc. may disturb business due to noise.)

• Place where refrigerant piping, drain piping and electrical wiring works are easy.

NOTES

* Be sure to install the inspection door at the electric control side.
** If reducers are used, servicing space must be increased equal to reducer's dimension.

Selection of the best location

Dimensional drawings

100 more

(Servicing space)

100 more

(Servicing space)

(Unit: mm)

No. Part Name

Description

PRHR041/031 PRHR021
1 Low pressure Gas pipe connection port Ø28.58 Brazing connection Ø22.2 Brazing connection
2 High pressure Gas pipe connection port Ø22.2 Brazing connection Ø19.05 Brazing connection

3 Liquid pipe connection port

Ø15.88 Brazing connection(PRHR041)
Ø12.7 Brazing connection(PRHR031)

Ø9.52 Brazing connection

4 Indoor unit Gas pipe connection port Ø15.88 Brazing connection Ø15.88 Brazing connection
5 Indoor unit Liquid pipe connection port Ø9.52 Brazing connection Ø9.52 Brazing connection
6 Control box
7 Suspension bolts M10 or M8 M10 or M8

481

450

450

7

345

1
2
3

(*) Inspection door
(servicing space)

300 more

(**)(Servicing space)

300 more

(**)(Servicing space)

100 more

100 more

(Servicing space)

(Servicing space)

300 more

(**)(Servicing space)

100 more

100 more

(Servicing space)

(Servicing space)

450 more

(Servicing space)

218

453(174)

(174)

124

182

182

6

41961 (137)

4 5

60

30