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

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Copyright ©2013 LG Electronics. Inc. All right reserved.
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
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Copyright ©2013 LG Electronics. Inc. All right reserved.
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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Copyright ©2013 LG Electronics. Inc. All right reserved.
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
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Copyright ©2013 LG Electronics. Inc. All right reserved.
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

Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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Piping Diagrams
4. Piping Diagrams
s
s
s
ss
sss
s
s
s
s
s
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
A
B
C
D
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

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Copyright ©2013 LG Electronics. Inc. All right reserved.
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
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Copyright ©2013 LG Electronics. Inc. All right reserved.
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 -
Copyright ©2013 LG Electronics. Inc. All right reserved.
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
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Copyright ©2013 LG Electronics. Inc. All right reserved.
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

Exploded View
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Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
7.1.3 PRHR021/PRHR021A
135500B 249951
135500A
W4810A
137213B
55211FB
55211FA
W4810B
55211G
W54100A
130401
137213A
352118
552204A
552204B
149900
552204B
552200
561410B
561410A
561410F561410E
561410I
249951
W6640A
W6640BW4004
261704 268711
W54100B
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

P/NO : MFL67400004 AUGUST, 2011