LG Multi V PRHR041 User manual

Heat Recovery Unit

SERVICE MANUAL

(Exploded View)

MODEL : PRHR041/PRHR041A

PRHR031/PRHR031A

PRHR021/PRHR021A

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual.

Only for authorized service personnel.

Internal Use Only

http://biz.lgservice.com

R410A

- 2 -

Only for training and service purposes LGE Internal Use Only

1. Specifications ..................................................................................................................3

2. Parts Functions ...............................................................................................................4

3. Dimensions ......................................................................................................................5

4. Piping Diagrams ..............................................................................................................6

5. Wiring Diagrams..............................................................................................................7

6. Electric Characteristics ..................................................................................................8

7. Exploded View .................................................................................................................9

TABLE OF CONTENTS

Specifications

- 3 -

Only for training and service purposes LGE Internal Use Only

1. Specifications

1.1 HR Unit

Notes:

1. Voltage range : Units are suitable for sue on electrical systems where voltage supplied to units terminals is not below or

above listed range limits.

2. Maximum allowable voltage unbalance between phases is 2%

Model

Max. Connectable No. of Indoor Units

Max. Connectable No. of Indoor Units of a branch

Net. Weight kg

lbs

Dimensions mm

(WxHxD) Inch

Casing

Connecting Pipes Indoor Liquid Pipe [mm/inch]

Gas Pipe [mm/inch]

Outdoor Liquid [mm/inch]

Low Pressure [mm/inch]

High Pressure [mm/inch]

Sound Absorbing Insulation Material

Power Supply

PRHR021/PRHR021A PRHR031/PRHR031A PRHR041/PRHR041A

16 24 32

888

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]

Ø15.88[5/8]

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]

Polyethylene Foam

1Ø, 220-240V, 50Hz / 1Ø, 220V, 60Hz(PRHR041, PRHR031, PRHR021)

1Ø, 208/230V, 60Hz(PRHR041A, PRHR031A, PRHR021A)

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Only for training and service purposes LGE Internal Use Only

Parts Functions

Prevent liquid chargingLBVLiquid bypass valve

Control the subcoolingSCEEVSubcooling EEV

Control the pressure between High and Low

pressure pipe during operation switching

BLVBalancing valve

Gas pipe connected with indoor unitGSPGas pipe

Liquid pipe connected with indoor unitLP2Liquid pipe 2

Control the path for heating or coolingSOL1, 2Solenoid assembly 1, 2

Liquid pipe connected with outdoor unitLP1Liquid pipe 1

Pipe for high pressure gasHPGVHigh pressure gas pipe

Pipe for low pressure gasLPGVLow pressure gas pipe

Major functionSymbolParts name

Balancing valve

Low pressure gas pipe

High pressure gas pipe

Liquid bypass valve

Solenoid assembly 1

Solenoid assembly 2

Liquid pipe1

Gas pipe

Liquid pipe2

Subcooling EEV

2. Parts Functions

2.1 Parts Functions

Dimensions

- 5 -

Only for training and service purposes LGE Internal Use Only

3.1 HR Units

480(18-29/32) 137(5-13/32)

345(13-19/32)

481(18-15/16)

218(8-19/32)

38(1-1/2)

60(2-3/8)30(1-3/16)

174(6-27/32)

453(17-27/32)204(8-1/32)

98(3-27/32)

CHASSIS CODE:

Outdoor Unit

PRHR041/PRHR041A

PRHR031/PRHR031A

PRHR021/PRHR021A

76, Seongsan-dong, Changwon City, Gyeongnam,

641-713, Korea

3. Dimensions

Only for training and service purposes LGE Internal Use Only

- 6 -

Piping Diagrams

4. Piping Diagrams

sss

Low pressure gas pipe

Liquid pipe

High pressure gas pipe

Liquid pipe

Gas pipe

Liquid pipe

Gas pipe

Liquid pipe

Gas pipe

Liquid pipe

Gas pipe

sSolenoid

EEV

Sensor

4.1 HR Unit

Ⓐ: To be switched operation between cooling and heating by two Solenoid valve

Ⓑ: To be used decreasing noise according to sub-cooling of inlet and outlet of indoor unit

(Simultaneous operation)

Ⓒ: To prevent liquid charging between high pressure gas valve and HR unit at cooling mode

Ⓓ: To be controlled the pressure between high and low pressure pipe during operation switching

- 7 -

Only for training and service purposes LGE Internal Use Only

Wiring Diagrams

1Ø 220V-240V, 50Hz

/ 220V, 60Hz

1Ø 208/230V,60Hz

5. Wiring Diagrams

5.1 HR Units

CN04 Solenoid valve 01L/H(For room1)

CN05 Solenoid valve 02L/H(For room2)

CN06 Solenoid valve 03L/H(For room3)

CN07 Solenoid valve 04L/H(For room4)

CN08 Solenoid valve 01 (Bypass for room1)

CN09 Solenoid valve 02 (Bypass for room2)

CN10 Solenoid valve 03 (Bypass for room3)

CN11 Solenoid valve 04 (Bypass for room4)

CN12 Solenoid valve bypass

CN14 Sub cooling EEV

CN16(SC Out) Sensor, sub cooling out

CN16(SC In) Sensor, sub cooling in

CN18(Liquid) Sensor, liquid receiver

SW01M Solonoid valve number Setting(When manual address)

SW02M(1) Selecting, auto address() or manual address()

SW02M(2~3) Setting, total number of indoor connected

SW03M Setting, the address of indoor_10(When manual address)

SW04M Setting, the address of indoor_1(When manual address)

SW05M Setting, HR unit number

Electric Characteristics

- 8 -

Only for training and service purposes LGE Internal Use Only

6. Electric Characteristics

6.1 HR Units

Symbols:

MCA: Minimum Circuit Amperes (A)

MFA : Maximum Fuse Amperes(see note 5)

kW : Fan Motor Rated Output(kW)

FLA : Full Load Amperes(A)

IFM : Indoor Fan Motor

Note :

1. Voltage Range

Units are suitable for use on electrical system where voltage supplied to unit terminals is not below or above the

listed range limits.

2. Maximum allowable voltage unbalance between phase is 2%.

3. MCA/MFA

MCA = 1.25 x FLA

MFA ≤ 4 x FLA

(Next lower standard fuse rating. Minimum 15A)

4. Select wire size based on the MCA.

5. Instead of fuse, use Circuit Breaker.

Units Power Supply IFM Input(W)

Model Hz Volts Voltage Range MCA MFA kW FLA Cooling Heating

PRHR021

50 220 Max: 242

Min: 198

0.115- -1414

PRHR031 0.15 15 - - 21 21

PRHR041 0.2 15 - - 28 28

Units Power Supply IFM Input(W)

Model Hz Volts Voltage Range MCA MFA kW FLA Cooling Heating

PRHR021A

60 208/230 Max: 252

Min: 187

0.115- -1414

PRHR031A 0.15 15 - - 21 21

PRHR041A 0.2 15 - - 28 28

Exploded View

- 9 -

Only for training and service purposes LGE Internal Use Only

7. Exploded View

7.1 HR Units

7.1.1 PRHR041/PRHR041A

135500B 249951

135500A

W4810A

W54100B

137213B

55211F B

55211FA

W4810B

55211G

W54100A

130401

137213A

352118

552204A

552204B

149900

552204B

552200

561410D561410B

561410A 561410C

561410G561410F561410E

561410I561410H

249951

W6640B

W6640A

W4004

261704 268711

Part L/No. Sensor Location Remark

Thermistor 1

263230

SC out heatproof PVC : blue

Thermistor 2 SC in heatproof PVC : white

Thermistor 3 Liquid heatproof PVC : black

Exploded View

- 10 -

Only for training and service purposes LGE Internal Use Only

7.1.2 PRHR031/PRHR031A

135500B 249951

135500A

W4810A

W54100B

137213B

55211FB

55211FA

W4810B

55211G

W54100A

130401

137213A

352118

552204A

552204B

149900

552204B

552200

561410B

561410A 561410C

561410G561410F561410E

561410I

249951

W6640B

W6640A

W4004

261704 268711

Part L/No. Sensor Location Remark

Thermistor 1

263230

SC out heatproof PVC : blue

Thermistor 2 SC in heatproof PVC : white

Thermistor 3 Liquid heatproof PVC : black

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