LG PRLK048A0 INSTALLATION INSTRUCTIONS

LG
AHU Control Kit / EEV Kit

Installation Manual

LG

IMPORTANT

• 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.

Visit us at : http://www.lgservice.com

Models: PRCKA0

PRLK048A0

ENGLISH

2 AHU Control Kit / EEV Kit

AHU Control Kit / EEV Kit Installation Manual

TABLE OF CONTENTS

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

■ Installation Scene...............................................................4

■ Supplies..............................................................................5

■ Optional Accessories.........................................................6

■ Part Description..................................................................7

■ Control Kit (PRCKA0).................................................................................7

■ EEV Kit(PRLK048A0).................................................................................8

■ Before Installation..............................................................9

■ EEV Kit Installation..........................................................11

■ Mechanical installation........................................................................11-12

■ Brazing work .......................................................................................13-14

■ Electrical work ..........................................................................................15

■ Control Kit Installation......................................................16

■ Mechanical installation.............................................................................16

■ Electric wiring work.............................................................................17-19

■ Dry contact connection_optional accessory............................................20

■ Thermistors Installation ...................................................21

■ Pipe thermistors installation................................................................21-23

■ Room thermistor.......................................................................................24

■ Test Operation..................................................................25

■ Troubleshooting................................................................26

Safety Precautions

Installation Manual 3

ENGLISH

■ Installation

Safety Precautions

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

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.

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

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage.

Be sure not to do.

Be sure to follow the instruction.

WARNING

When the product is soaked (flooded or
submerged), contact an Authorized Service

Center.

• There is risk of fire or electric shock.

Be cautious that water could not enter the
product.

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

■ Operation

Use the correctly rated
breaker or fuse.

• 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 installation, always
contact the dealer or an

Authorized Service Center.

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

Don't touch with the
hands while the power is
on

•

There is risk of fire or electric
shock.

Use standard
parts(connector).

•

Do not disassemble or repair
the product. There is risk of fire
or electric shock.

For electrical work, contact
the dealer, seller, a qualified
electrician, or an Authorized

Service Center.

•

Do not disassemble or repair
the product. There is risk of fire
or electric shock.

WARNING

CAUTION

4 AHU Control Kit / EEV Kit

Installation Scene

Installation Scene

1
2
3
4
5

Air Handling Unit

Outdoor Unit

AHU Control Kit(PRCKA0)

AHU EEV Kit(PRLK048A0)

Field piping

Field supply

Multi_V

-

-

Field supply

Parts and components

6
7
8
9

10

Control kit wiring

Pipe thermistors (EBG36949304/EBG36949305)

Room thermistor (EBG36949303)

Remote controller(PQRCUSA0)

Dry contact PCB(PQDSBNGCM0)

(Power supply and communication between control kit and outdoor unit)

Evaporator (In/Out) control of Air Handling Unit

Return air control

Optional accessory
Optional accessory

Wiring connections

No. Name Remarks

Signal
Pipe
Thermistor
Air flow

Refrigerant flow
(Cooling)

Refrigerant flow
(Heating)

7

8

1

9

3

10

6

4

2

5

Installation Manual 5

ENGLISH

Supplies

Supplies

Components

Quantity(EA) 1 1 2(Each 1) 1 5(Each 1)

AHU Control Kit Room thermistor Pipe thermistors

Installation

manual

Capacity setting

option PCB

AJT57850901 EBG36949303

EBG36949304(black)
EBG36949305 (red)

MFL50024801

EBR52358907/09
/10/11/12

P/NO

Shape

PRCKA0

Components

Quantity(EA)

11

AHU EEV Kit Installation manual

AJT57850801 MFL50024801

P/NO

Shape

PRLK048A0

Model Name

Weight(kg) Dimension(mm)

POWER

NET Gross W H D

PRCKA0 2.2 3.6 280 135 280 220~240V/50Hz/1Phase

PRLK048A0 3.1 3.6 404 83 217 -

H

D

W

W

H

D

6 AHU Control Kit / EEV Kit

Optional Accessories

Optional Accessories

Components Remote controller Dry contact PCB

PQRCUSA0 PQDSBNGCM0

Model name

Shape

Accessories

* For further details of the accessories, refer to the manual provided at the time of purchasing the

accessories.

Installation Manual 7

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Part Description

Part Description

Control Kit (PRCKA0)

1
2
3
4
5
6
7
8

9
10
11
12

Plastic (+) bolt

Control box cover

Main PCB

Option PCB(36k)

Main PCB case

Terminal block (communication)

Terminal block (POWER Supply)

Panel
Support Tie wrap
Control box case

Cable gland(2type)

Bracket

4
1
1
1
1
1
1
1
8
1
8
4

No. Part Name Quantity(EA)

7

9

1

CN-OPTION

6

2

4

3

5

8

10

12

11

8 AHU Control Kit / EEV Kit

Part Description

EEV Kit(PRLK048A0)

1
2
3
4
5
6
7
8

Panel upper

Bracket

Terminal box

Cable gland

Insulator tube

EEV assembly (EEV, Strainer, Tube)

Support tie wrap

Panel base

1
2
1
2
1
1
1
1

No. Part Name Quantity(EA)

3

1

4

4

5

6

7

8

2

Installation Manual 9

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Before Installation

Before Installation

■ Don't install or operate the unit in rooms mentioned below.
Where mineral oil, like cutting oil is present.
Where the air contains high levels of salt such as air near the ocean.
Where sulphurous gas is present such as that in areas of hot spring.
In vehicles or vessels.
Where voltage fluctuates a lot such as that in factories.
Where high concentration of vapor spray are present.
Where machines generating electromagnetic waves are present.
Where acidic or alkaline vapor is present.
The option boxes must be installed with entrances downward.

CAUTION

■ Check the mentioned below, when you apply the AHU(Field supply).
If the AHU (Field supply) provided in the field is exclusively for heating, you must not
change the operating mode to cooling on the remote controller. If not, it can cause electric
shock, injury or death. If you want to operate in cooling mode, AHU (Field supply) must
comply with the following details.
(Following)

- The insulation level of AHU (Field supply) motor must be ‘F’ or above, and the protection

level must satisfy ‘IP 54’.

- AHU (Field supply) must have the drain pan installed.
Fan speed button on the wired remote controller(PQRCUSA0) is not operated.
For refrigerant piping of outdoor unit, refer to the installation manual supplied with the

outdoor unit.
For installation of the wired remote controller(PQRCUSA0), refer to the manual supplied

with the wired remote controller.
For connection of the Dry contact PCB(PQDSBNGCM0), refer to the manual supplied with

the Dry contact PCB(PQDSBNGCM0).

■ AHU Control Kit
Thermistor cable and remote controller wire should be located at least 50mm away from

power supply wires and from wires to the controller. Not following this guideline may result
in malfunction due to electrical noise.

Use only specified wires, and tightly connect wires to the terminals. Keep wiring in neat
order so that it does not obstruct other equipment. Incomplete connections could result in
overheating, and in worse case electric shock or fire.

10 AHU Control Kit / EEV Kit

Before Installation

Selection of Evaporator(Air Handling Unit)

See table below for applicable units
Selecting the capacity setting 'Option PCB'(Accessory) according to the capacity mentioned below.

-

The corresponding capacity setting '

Option

PCB' needs to be selected depending on the need

capacity.

- After checking the need capacity, remove the 36k

Option

PCB equipped in the main PCB,

and set up the

Option

PCB fitted the need capacity in the main PCB.

CAUTION

Saturated Suction Temperature (SST) = 6°C, SH (Superheat) = 5K, Air Temperature = 27°C DB / 19°C WB.

(Main PCB)

EBR52358907 28K 0.88~1.08 7 ~ 9 22 ~ 26
EBR52358908 36k 0.88~1.08 9 ~11 25 ~ 32
EBR52358909 42k 0.88~1.08 11~ 13 31 ~ 35
EBR52358910 48k 1.23~1.51 13 ~ 16 33 ~ 45
EBR52358911 76k 1.93~2.35 20 ~ 24 50 ~ 64
EBR52358912 96k 1.93~2.35 25 ~ 31 64 ~ 72

Option PCB

P/No

Capacity

(Btu/h)

Allowed heat

exchanger

Volume (dm

3

)

Allowed heat

exchanger capacity

(kW)

Air flow rate

(CMM)

Detail

Capacity setting
'Option PCB'

Installation Manual 11

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EEV Kit Installation

EEV Kit Installation

Mechanical installation

1. Remove the EEV Kit box cover by unscrewing the screw(4EA).

2. Drill 4 holes on correct position and fix the EEV Kit box securely with 4 screws(Field supply)

through the provided holes Ø6 mm(Reference the length of the holes Ø6)

190 mm

Provided holes
Ø6 mm (4EA)

Pipe size

Ø12.7 mm(1/2")

338 mm

12 AHU Control Kit / EEV Kit

EEV Kit Installation

3. Prepare the inlet/outlet field piping just in front of the connection(do not braze yet).

4. Remove the pipe fixing bracket(C) by unscrewing 4 x M4.

5. Remove the Pipe insulation.

6. Braze the field piping.

A. Inlet coming from the outdoor unit
B. Outlet to evaporator
C. Pipe fixing bracket(2EA)
D. Pipe insulation
E. EEV Assembly
F. Field pipe(Inlet / Outlet)

■ Make sure to cool the filters and EEV body with a wet cloth and make sure the body
temperature does not exceed 120°C during brazing.

■ Make sure that the other parts such as electrical box, tie wraps and wires protected from
direct brazing flames during brazing.

CAUTION

Mechanical installation

E

D

C(2EA)

B A

F

F

Installation Manual 13

ENGLISH

EEV Kit Installation

Brazing work

7. After brazing, put the Pipe insulation(D) on the EEV Assembly(E) and fold the Pipe
insulation(D) mentioned below (after pealing off the liner).

8. Secure the pipe fixing bracket(C:2EA) in place again (4 x M4)

9. Make sure that field pipes are fully insulated.
Field pipe insulation must reach up to the insulation you have put back in place as per
procedure step 7. Make sure that there is no gap between both ends in order to avoid
condensation dripping (finish the connection with tape eventually).

Fold

Liner

14 AHU Control Kit / EEV Kit

EEV Kit Installation

■ Be sure to carry out a nitrogen blow when brazing.

Brazing without carrying out nitrogen replacement or releasing nitrogen into the piping will
create large quantities of oxidized film on the inside of the pipes, adversely affecting
valves and compressors in the refrigerating system and preventing normal operation.

■ When brazing while inserting nitrogen into the piping, nitrogen must be set to 0.02 MPa

with a pressure-reducing valve(just enough so that it can be felt on the skin).

CAUTION

■ The leakage test is executed by pressurizing nitrogen gas up to 3.8MPa(38.7kgf/cm2)

(The test must be done with the service valve of the outdoor unit closed and the gas must
be pressurized at the liquid pipe, gas pipe and high/low pressure common pipe of the
outdoor unit), and the pressure of the nitrogen gas must not drop for 24 hours.

■ For more details, refer to the manual of the outdoor unit.

a Refrigerant piping b Part to be brazed
c Taping d Hands valve
e Pressure-reducing valve f Nitrogen

Brazing work

a b

c

e

d

brazing

f

f

Installation Manual 15

ENGLISH

EEV Kit Installation

Electrical work

10. Open the terminal box cover(A).

11.

Pass EEV cable(Field supply, 6 wires) from the AHU Control Kit through cable gland and connect
the cable wires into the terminal connector(C) following instructions as describe in step 12. Route
the cable out of the

EEV Kit

box according to figure below and fix with the support tie wrap(D).

A. Terminal box cover
B. Cable gland
C. Terminal connector
D. Support tie wrap
E. Electric wiring work(Field supply, 6 wires)

NOTE

1. BR : BROWN

2. RD : RED

3. BL : BLUE

4. OR : ORANGE

5. YL : YELLOW

6. WH : WHITE

12. Use a screwdriver(+) and follow indicated instructions for connecting cable wires into the

terminal connector according to the circuit diagram.

13.

Make sure that field wiring and insulation is not squeezed when closing the EEV Kit box cover.

14. Close the EEV Kit box cover(4 x M4).

■ Before connecting the wires(Field supply), make sure to compare with the Connect
label between EEV Kit and Control Kit.

■ Make sure to connect the wires according to the circuit diagram in Control Kit.

CAUTION

A
B

D

E

Detail

EEV

BRRDBLORYLW

C

H

E

Field connect wires

Detail

Connect
Label

EEV

BRRDBLORYLW

H

Field work

EEV

BRRDBLORYLW

H

16 AHU Control Kit / EEV Kit

Control Kit Installation

Control Kit Installation

Mechanical installation

1. Remove the Control Kit box cover by unscrewing the plastic bolt(4EA).

2. Drill 4 holes on correct position and fix the Control Kit box securely with 4 screws(Field supply)
through the provided holes Ø4.5 mm(Reference the length of the holes Ø4.5)

298 mm

189 mm

Provided holes
Ø4.5 mm (4EA)

Installation Manual 17

ENGLISH

Control Kit Installation

Electric Wiring Work

1. For electric wiring, refer to figure 'Circuit diagram' mentioned below.

■ Circuit diagram

CN-POWER AC POWER SUPPLY

AC POWER LINE INPUT FOR INDOOR CONTROLLER

CN-COM COMMUNICATION

CONNECTION BETWEEN INDOOR AND OUTDOOR

CN-ROOM ROOM SENSOR ROOM AIR THERMISTOR

CN-PIPE/IN SUCTION PIPE SENSOR PIPE IN THERMISTOR

CN-PIPE/OUT

DISCHARGE PIPE SENSOR

PIPE OUT THERMISTOR

CN-REMO REMOTE CONTROLLER REMOTE CONTROL LINE

CN-FLOAT FLOAT SWITCH INPUT FLOAT SWITCH SENSING

CN-EEV EEV OUTPUT EEV CONTROL OUTPUT

CN-OPTION OPTION PCB

COMMUNICATION BETWEEN MAIN AND OPTION

CN-CC DRY CONTACT DRY CONTACT LINE

LOCATION POINT FUNCTION

CONNECTOR

NUMBER

18 AHU Control Kit / EEV Kit

4. For the wired remote controller wire and outdoor unit communication wire, remove the coating
at the end of the wire to connect and use the ring type (Ø3) to connect to the terminal block.

Ring type (Ø 3)

POWER SUPPLY

FAN SIGNAL
Outdoor com.

Room thermistor

Pipe thermistor(In/Out)

Remote controller

EEV Kit

DRY contact

No. Electric wire

Control Kit Installation

Electric Wiring Work

2. For connection to outdoor unit and to controller (Field supply) :
Pull the wires inside through the cable gland and close that's nut firmly in order to ensure a
good pull relieve and water protection.

3. The wires require an additional pull-relief. Strap the wire with the support tie wrap.

5. Each wire have to pass the number of the cable gland mentioned below.

(Side view)

■ Connection of the wires

Detail

Support
tie wrap

Nut of cable
gland

Cable insert

(Side view)

8

1 2 3 4 5 6 7

Installation Manual 19

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Control Kit Installation

Electric Wiring Work

■ All field supplied parts and materials and electric works must be conform to local codes.

■ Use copper wire only.

■ All wiring must be performed by an authorized electrician.

■ A main switch or other means for disconnection, having a contact separation in all poles,

must be incorporated in the fixed wiring in accordance with relevant local and national
legislation.

■ Refer to the installation manual attached to the outdoor unit for the size of power supply
electric wire connected to the outdoor unit, the capacity of the circuit breaker and switch,
wiring and wiring instructions.

CAUTION

20 AHU Control Kit / EEV Kit

Control Kit Installation

Dry contact connection_optional accessory

Local controller

CN-INDOOR1

CN-INDOOR2

CD_Operation

CN_OUT

Dry Contact PCBDry Contact PCB

Dry contact PCB

Signal

CN_Ther/Per

Field work

1. Using screw(4EA), fix the dry contact on the side panel.

2. Using cable, connect the dry contact to main PCB.
For more information, please refer to dry contact installation manual.

Dry contact
installation location

❈ Applicable dry contact model

- PQDSBNGCM0

Installation Manual 21

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Thermistors Installation

Pipe thermistors Installation

Location of the pipe thermistors

A correct installation of the thermistors is required to ensure a good operation :

1. Pipe_In(EBG36949304)
: Install the thermistor behind the distributor on the coldest pass the heat exchanger

(contact your heat exchanger dealer).

2. Pipe_Out(EBG36949305)
: Install the thermistor at the outlet of the heat exchanger as close as possible to the

heat exchanger.

Evaluation must be done to check if the evaporator is protected against freeze-up.
Execute test operation and check for freeze-up.

1 Pipe_In(Suction pipe)
2 Pipe_Out(Discharge pipe)

(Air Handling Unit)

Thermistors Installation

1

2

22 AHU Control Kit / EEV Kit

Thermistors Installation

Pipe thermistors Installation

Installation of the pipe thermistor cable

1. Put the thermistor cable in a separate protective tube.

2. Always add a pull-relief to the thermistor cable to avoid atrain on the thermistor cable and
loosening of the thermistor. Strain on the thermistor cable or loosening of the thermistor
may result in bad contact and incorrect temperature measurement.

2

45°

1

Fixation of the pipe thermistors (Field work)

1. Fix the thermistor with insulating aluminum tape (Field supply) in order to ensure a good
heat transference.

2. Put the supplied piece of rubber around the thermistor(EBG36949304/05) in order to
avoid loosening of the thermistor after some years.

3. Fasten the thermistor with 2 tie wraps.

4. Insulate the thermistor with the supplied insulation sheet.

1234

Installation Manual 23

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Thermistors Installation

Fixation of the pipe thermistors (Field work)

1. Fix the thermistor with insulating aluminum tape (Field supply) in order to ensure a good
heat transference.

2. Put the supplied piece of rubber around the thermistor(EBG36949304/05) in order to
avoid loosening of the thermistor after some years.

3. Fasten the thermistor with 2 tie wraps.

4. Insulate the thermistor with the supplied insulation sheet.

INSTRUCTION

■ Put the thermistor wire slightly top to avoid water accumulation on down of the thermistor.

■ Make good between thermistor and evaporator. Put the top of the thermistors on the

evaporator, this is the most sensitive point of the thermistor.

1 Most sensitive point of the thermistor
2 Maximize the contact

Pipe thermistors Installation

2

1

45°

24 AHU Control Kit / EEV Kit

Thermistors Installation

Room thermistor

Installation of the Room thermistor

1. The room thermistor have to be installed in the return air part of the AHU(Field supply)
mentioned below.

(Air Handling Unit)

(AHU Control Kit)

Thermistor
Air flow

Installation Manual 25

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Test Operation

Test Operation

Before test operation, be sure all information is understood completely, and follow the
guideline of manual.

■ Check the refrigerant piping of outdoor unit.
(Additional charging of the refrigerant ,the maximum allowed piping length and open the stop valve)

* For more detailed information of that, refer to the installation manual supplied with the

outdoor unit.

■ Executing the test operation.

1. Connect the power and turn on with the wired remote controller(PQRCUSA0).

2. Check the AHU(Field supply) and outdoor unit operation when the wired remote

controller (PQRCUSA0) is controlled.

* For more detailed function of the wired remote controller, refer to the Owner's &

Installation manual supplied with the wired remote controller.

* Button

on the wired remote controller(PQRCUSA0) is not operated.

OPERATION INDICATION
SCREEN

SET TEMPERATURE Button
WIRELESS REMOTE

(Do not operate)

CONTROLLER RECEIVER

• Some products don't receive the
wireless signals.

VENTILATION Button

(Do not operate)

OPERATION MODE SELECTION
Button

SUBFUNCTION Button
FUNCTION SETTING Button
EXIT Button
ON/ OFF Button
ROOM TEMPERATURE Button
FAN SPEED Button

(Do not operate)

AIR FLOW Button

(Do not operate)

RESERVATION/ TIME SETTING
Button

SETTING/ CANCEL Button
UP, DOWN, LEFT, RIGHT Button

1

9

11
12

3

5
6

2

4 10

13
14

7
8

15

Please attach the inform label inside of the door.
Please choose proper language defend on your
country.

1

2
3

4
5

6
7
8

9
10
11

12
13

14
15

26 AHU Control Kit / EEV Kit

Troubleshooting

Troubleshooting

AHU Control Kit

does not work

AHU EEV Kit

does not work

No power supply Check the electrical connection and voltage of the

power supply.

Wiring is wrong Check the electrical connection of the Control kit

(Refer to the circuit diagram of the Control Kit)

AHU Control Kit is broken Check the electrical and mechanical part.

Wiring is wrong Check the electrical connection of the EEV Kit
Piping is wrong Check the piping connection between the EEV Kit

and outdoor unit

Problem Cause Remedy

P/No.: MFL50024801

After reading this manual, keep it in a place easily accessible to the user for future reference.

Printed in Korea