Haier MRV SII AU042FNEUA User manual

Service Manual
MRV SII
SYJS-02-2021 REV.A Edition: 2021-02

2
CONTENTS
1. General Information...............................................................................................................................................1
2. Specification ..........................................................................................................................................................4
3. Dimension .............................................................................................................................................................8
4. Function Parts layout ............................................................................................................................................9
5. Center of gravity .................................................................................................................................................10
6. Refrigerant Circuit ............................................................................................................................................... 11
7. Wiring Diagram....................................................................................................................................................13
8. Performance Curves ...........................................................................................................................................15
9. Selection Procedure ............................................................................................................................................19
10. Operation Range ...............................................................................................................................................20
11. Noise Level ........................................................................................................................................................21
12. Outdoor Installation ...........................................................................................................................................22
12.1 Safety ...........................................................................................................................................................22
12.2 Installation instruction...................................................................................................................................24
13. PCB Photo.........................................................................................................................................................39
14. Dip Switch Setting .............................................................................................................................................40
15. Monitor Tools .....................................................................................................................................................42
16. Outdoor Unit Control .........................................................................................................................................44
17. Failure Code......................................................................................................................................................47
18. Troubleshooting.................................................................................................................................................50

1
1. General Information
1.1 Indoor units
4-WAY CASSETTE TYPE/PB-700lB
AB052MCERA
AB072MCERA
AB092MCERA
AB122MCERA
AB162MCERA
AB182MCERA(C)
ROUND-WAY SMART AIR FLOW CASSETTE/ PB-
950KB
AB072MRERA
AB092MRERA
AB122MRERA
AB162MRERA
AB182MRERA
AB242MRERA
AB282MRERA
AB302MRERA
AB382MRERA
AB482MRERA
AB602MRERA
4-WAY CASSETTE TYPE/PB-950JB
AB182MCERA
AB242MCERA
AB282MCERA
AB302MCERA
AB382MCERA
AB482MCERA
MINI 4-WAY CASSETTE TYPE/PB-620KB
AB052MCERA(M)
AB072MCERA(M)
AB092MCERA(M)
AB122MCERA(M)
AB162MCERA(M)
AB182MCERA(M)
ONE WAY CASSETTE TYPE/P1B-1050IB
AB052MAERA
AB072MAERA
AB092MAERA
AB122MAERA
2-WAY CASSETTE TYPE/ P1B-1055IB
AB072MBERA
AB092MBERA
AB122MBERA
AB162MBERA
AB182MBERA
LOW ESP DUCT TYPE
AD072MLERA
AD092MLERA
AD122MLERA
AD162MLERA
AD182MLERA
AD242MLERA
SLIM LOW ESP DUCT
AD072MSERA
AD092MSERA
AD122MSERA
AD162MSERA
AD182MSERA
AD242MSERA
DC SLIM LOW ESP DUCT
AD072MSERA(D)
AD092MSERA(D)
AD122MSERA(D)
AD162MSERA(D)
AD182MSERA(D)
AD242MSERA(D)

2
MED ESP DUCT TYPE (80/120Pa)
AD182MZERA
AD242MZERA
AD282MZERA
AD302MNERA
AD382MNERA
AD482MNERA
MED ESP DUCT TYPE (50/96Pa)
AD182MMERA
AD242MMERA
AD282MMERA
AD302MMERA
AD382MMERA
AD482MMERA
MED ESP DUCT TYPE (50/100Pa)
AD052MJERA
AD072MJERA
AD092MJERA
AD122MJERA
AD162MJERA
AD182MJERA
AD242MJERA
AD282MJERA
AD302MJERA
AD382MJERA
AD482MJERA
CONSTANT AIR VOLUME DUCT TYPE
AD072MQERA
AD092MQERA
AD122MQERA
AD152MQERA
AD182MQERA
AD242MQERA
AD282MQERA
AD302MQERA
AD362MQERA
AD422MQERA
AD482MQERA
AD542MQERA
HlGH ESP DUCT TYPE
AD182MHERA
AD242MHERA
AD282MHERA
AD302MHERA
AD382MHERA
AD482MHERA
CONVERTlBLE TYPE
AC092MCERA
AC122MCERA
AC162MCERA
AC182MCERA
AC242MCERA
AC282MFERA
AC302MFERA
AC382MFERA
AC482MFERA
EK HIGH WALL
AS072MGERA
AS092MGERA
AS122MGERA
AS162MGERA
AS182MGERA
AS242MGERA
BUILIT-IN FLOOR STANDING
AE072MLERA
AE092MLERA
AE122MLERA
AE162MLERA
AE182MLERA
AE242MLERA

3
N HIGH WALL
AS052MNERA AS052MFERA
AS072MNERA AS072MFERA
AS092MNERA AS092MFERA
AS122MNERA AS122MFERA
AS162MNERA AS162MFERA
AS182MNERA AS182MFERA
AS242MNERA AS242MFERA
AS282MNERA
AS302MNERA
CONSOLE
AF052MAERA
AF072MAERA
AF092MAERA
AF122MAERA
AF182MAERA
NEW CONSOLE
AF052MBERA
AF072MBERA
AF092MBERA
AF122MBERA
AF182MBERA
CONVERTlBLE TYPE(New)
AC092MDERA AC282MDERA
AC122MDERA AC302MDERA
AC162MDERA AC382MDERA
AC182MDERA AC482MDERA
AC242MDERA

4
2. Specication
Model AU042FNERA
Power supply Ph/V/Hz 1/220~240/50/60
Cooling
Rated capacity kW 12.10
Rated capacity kBtu/h 41.3
Rated power input kW 4.25
Max. power input kW 6.0
EER 2.85
Rated current A 20.3
Max. current A 28.3
Heating
Rated capacity kW 12.10
Rated capacity kBtu/h 41.3
Rated power input kW 4.10
Max. power input kW 5.80
COP 2.95
Rated current A 19.6
Max. current A 27.9
Compressor
Brand Mitsubishi
Model MNB42FFAMC-L
Type Rotary
Compressor quantity 1 INV
Capacity W 13780
Power Input W 4130
Rated current(RLA) A 15.8
Speed rps 60
Crankcase Heater W 28
Refrigerant oil brand Itochu.,LTD.,Shanghai
Refrigerant oil type FV50S
Refrigerant oil charge ml 1400
Outdoor fan
motor
Brand NIDEC/BROAD OCEAN
Model SIC-88FWJ-F1180-1/ZWK511D000001
Voltage 310V
IP Class IP44
Type DC
Insulation class E
Safe class I
Power Input W 225*2
Output W 180*2
Rated current A 0.40
Capacitor μF /
Speed rpm 770
Outdoor fan
Brand SHUNWEI
Model /
Material Plastic
Type Axial
Diameter mm 550
Height mm 200

5
Model AU042FNERA
Outdoor coil
Number of rows 2
Tube pitch(a)x row pitch(b) mm 21*18.186
Fin spacing mm 1.4
Fin type (code) Corrugated
Fin Coating Type optional Hydrophilic aluminum
Salt Spray Test Duration Hour 500
Tube outside dia.and type Internal thread copper tube
mm Ф7
Coil length x height mm 1005*924
Number of circuits 7
Cabinet coating
Coating type Powder Coating
Salt Spray Test Duration Hour 500
Sheet Metal Material Hot zinc plate
Sheet Metal Thickness mm 0.8
Control panel enclosure IP class
Outdoor air ow
standard IP24
m3/h 5400
Outdoor sound level(sound pressure level ) dB(A) 66
Outdoor sound level(sound power level ) dB(A) 77
Outdoor unit
Dimension(W*H*D) mm 950/965/370
Packing (W*H*D) mm 1010/990/458
Net weight kg 90
Gross weight kg 97
Refrigerant Type R410A
Charged volume kg 3.3
Throttle type EEV
Design pressure MPa 4.15
Refrigerant piping
Liquid pipe mm Φ9.52
Gas pipe mm Φ15.88
Total pipe lenth m 120
Max. pipe length(Equivalent/
Actual) m 70
Max.Diff. indoor/outdoor unit m "30
20"
Max.Diff. indoor/indoor unit m 10
Connectable indoor unit ratio % 50-130
Maximum indoor units Piece 5
Connection wiring Power wiring mm212
Signal wiring mm2shield wire：(0.75-2）*2
Operation Range oCCooling: -5~52
Heating: -15~21
Nominal condition:
Indoor temperature (cooling): 27 DB(°C)/19 WB(°C), indoor temperature (heating): 20 DB(°C)/14.5 WB(°C).
Outdoor temperature (cooling): 35 DB(°C)/24 WB(°C), outdoor temperature (heating): 7 DB(°C)/6 WB(°C).
The data is measured with 7.5m equivalent pipe and 0m height difference.
The noise level will be measured in the third octave band limited values in the semi-anechoic chamber, using a
real time analyser calibrated sound intensity meter. It is a sound pressure noise level.

6
Model AU052FNERA
Power supply Ph/V/Hz 1/220~240/50/60
Cooling
Rated capacity kW 14.00
Rated capacity kBtu/h 47.8
Rated power input kW 5.00
Max. power input kW 6.4
EER 2.80
Rated current A 23.9
Max. current A 29.3
Heating
Rated capacity kW 14.00
Rated capacity kBtu/h 47.8
Rated power input kW 4.83
Max. power input kW 6.40
COP 2.90
Rated current A 23.1
Max. current A 29.3
Compressor
Brand Mitsubishi
Model MNB42FFAMC-L
Type Rotary
Compressor quantity 1 INV
Capacity W 13780
Power Input W 4130
Rated current(RLA) A 15.8
Speed rps 60
Crankcase Heater W 28
Refrigerant oil brand Itochu.,LTD.,Shanghai
Refrigerant oil type FV50S
Refrigerant oil charge ml 1400
Outdoor fan
motor
Brand NIDEC/BROAD OCEAN
Model SIC-88FWJ-F1180-1/ZWK511D000001
Voltage 310V
IP Class IP44
Type DC
Insulation class E
Safe class I
Power Input W 225*2
Output W 180*2
Rated current A 0.40
Capacitor μF /
Speed rpm 770
Outdoor fan
Brand SHUNWEI
Model /
Material Plastic
Type Axial
Diameter mm 550
Height mm 200

7
Model AU052FNERA
Outdoor coil
Number of rows 2
Tube pitch(a)x row pitch(b) mm 21*18.186
Fin spacing mm 1.4
Fin type (code) Corrugated
Fin Coating Type optional Hydrophilic aluminum
Salt Spray Test Duration Hour 500
Tube outside dia.and type Internal thread copper tube
mm Ф7
Coil length x height mm 1005*924
Number of circuits 7
Cabinet coating
Coating type Powder Coating
Salt Spray Test Duration Hour 500
Sheet Metal Material Hot zinc plate
Sheet Metal Thickness mm 0.8
Control panel enclosure IP class
Outdoor air ow
standard IP24
m3/h 5400
Outdoor sound level(sound pressure level ) dB(A) 68
Outdoor sound level(sound power level ) dB(A) 79
Outdoor unit
Dimension(W*H*D) mm 950/965/370
Packing (W*H*D) mm 1010/990/458
Net weight kg 90
Gross weight kg 97
Refrigerant Type R410A
Charged volume kg 3.3
Throttle type EEV
Design pressure MPa 4.15
Refrigerant piping
Liquid pipe mm Φ9.52
Gas pipe mm Φ15.88
Total pipe lenth m 120
Max. pipe length(Equivalent/
Actual) m 70
Max.Diff. indoor/outdoor unit m "30
20
Max.Diff. indoor/indoor unit m 10
Connectable indoor unit ratio % 50-130
Maximum indoor units Piece 6
Connection wiring Power wiring mm212
Signal wiring mm2shield wire：(0.75-2）*2
Operation Range oCCooling: -5~52
Heating: -15~21
Nominal condition:
Indoor temperature (cooling): 27 DB(°C)/19 WB(°C), indoor temperature (heating): 20 DB(°C)/14.5 WB(°C).
Outdoor temperature (cooling): 35 DB(°C)/24 WB(°C), outdoor temperature (heating): 7 DB(°C)/6 WB(°C).
The data is measured with 7.5m equivalent pipe and 0m height difference.
The noise level will be measured in the third octave band limited values in the semi-anechoic chamber, using a
real time analyser calibrated sound intensity meter. It is a sound pressure noise level.

8
3. Dimension
AU042FNEUA AU052FNEUA

9
4. Function Parts layout
AU042FNEUA AU052FNEUA

10
5. Center of gravity

11
6. Refrigerant Circuit

12
Part name Sign Function Date Note
Compressor /
Capacity control, meet indoor load
request by adjusting frequency and
opening and closing fixing frequency
compressor.
20°C
Pressure switch
HPS High pressure protection 4.15Mpa, OFF
LPS
In cooling, compressor frequency
adjustment and protection control for
abnormal pressure.
0~1.7MPa
Electronic
expansion valve EEV In heating, refrigerant flow control (subcooling valve) Φ3.0
Solenoid valve SV1
1. Keep balance of high/low pressure
when compressor starts up and stops
2. High/low pressure protection
AC220V
Open when power is on,
close when power is off.
2A
4-way valve 4WV Changing over between cooling and
heating
AC220V electrified in
heating; powered off in
cooling or defrosting.
Temp. sensor
Td Detect the top temp. of compressor R(80°C)=50K
B(25/80°C)=4450K
Ts Detect the top suction of compressor
R(80°C)=10K
B(25/80°C)=3700K
Tao Detect ambient temp., set primary fan
speed and control defrost condition
Tdef Detect frost condition of outdoor heat
exchanger

13
7. Wiring Diagram
【High Voltage Warning】
【Precautions Before Operation】
The control box is equipped with high-voltage components
Please turn off the power and keep the unit shut down for more than 10 minutes and ensure that voltage
between P and N on the frequency conversion board is reduced to DC 20V or less before checking the
inside of the control box.
·It is not allowed to connect the power line to the P and Q terminals. These terminals are used to connect the
control signal lines.After connection, the printed circuit board will be burned.
·After the initial installation, please confirm that the power supply voltage of the indoor unit and outdoor unit is
normal.
Before trial operation, ensure that the outdoor unit is powered on for more than 12 hours to fully warm up the
compressor.
·When the outdoor unit leaves the factory, the dial code BM1_1 is set to the OFF state by default.
The commissioning personnel shall confirm that the number of indoor unit displayed on the display board is
consistent with the number of indoor unit actually connected and the type of power supply and outdoor unit capacity
are consistent with the parameters marked on the outdoor unit nameplate, then this dial is set to the ON state;If it is
inconsistent, the outdoor unit cannot detect some indoor unit or the dial setting of the outdoor unit is wrong.
At this time, do not force the dial to ON, which will cause the unit to malfunction or damage.
L N
P Q
【 Wiring Diagram 】
Control
Board
P
ACL
HPS
P
LPS TD TE (1) TC TS TA
ACN
BM1BM2
CN1
CN19
PTC
CN2 CN3 CN4 CN5 CN6 CN7
LED4
LED3
LED1
LED2 PC
CN29 CN28
CN21
CN24
CN10
CN9
CN8
PMV
CN30
6.3A 250VAC
FUSE1
CN18
CN17
CN16
CN25
CN15
CN12
ACFAN2
SW1SW3
SW4
DCFAN1
SW2
HEATER
4WV
SV1
NO
12345678
NO
12345678
M
【 High Voltage Warning 】
red
indoor communication
outdoor power supply
white
green
green
green
red
red
red
red
red
red blue
blue white
white
white
CN20
white
white
CN11
white
black yellow blue red
red
red
red
white
white
CN14
ACFAN1
white
CN13 DCFAN2
yellow
white
ACL
DK2
DK1
black
U
V
W
COMP
compressor
red
black
white
frequency conversion board
Tfin
CN11
CN1
E
reactor
white
Display
Board
CN31 CN32
CN30
SW01
LD1 LD2 LD3
SW02
white
white
red
0150541652
CN13
ACL’
ACN’
M
DC FAN
ACN
JP3
CN12
white
white
yellow/green
【Precautions Before Operation】
·After the initial installation, please confirm that the power supply voltage of the indoor unit and outdoor unit is normal.
Before trial operation, ensure that the outdoor unit is powered on for more than 12 hours to fully warm up the compressor.
·When the outdoor unit leaves the factory, the dial code BM1_1 is set to the OFF state by default.
·It is not allowed to connect the power line to the P and Q terminals. These terminals are used to connect the control
signal lines.After connection, the printed circuit board will be burned
The commissioning personnel shall confirm that the number of indoor unit displayed on the display board is consistent with
the number of indoor unit actually connected and the type of power supply and outdoor unit capacity are consistent with
the parameters marked on the outdoor unit nameplate, then this dial is set to the ON state;If it is inconsistent,
the outdoor unit cannot detect some indoor unit or the dial setting of the outdoor unit is wrong.
At this time, do not force the dial to ON, which will cause the unit to malfunction or damage.
[1][2][3][4][5][6][7][8]
-1 1 0 0 0 0 0
0
4.0
01 0 0 5.0 0 0 0 0
BM1
BM2
dial model
【 Dial Code Description 】
1
O represent OFF
1 represent ON
- represent need to be setting when installing
ACL
ACN
HEATER
SV1
SV2
4WV
CA
DCFAN1
DCFAN2
LED1-4
SW1-4
symbol description
Live line
Neutral line
Compressor heating belt
Unloading solenoid valve
Jet solenoid valve
Four-way valve
AC fan capacitor
DC fan above
DC fan below
Indicator light
button
BM1,2
Dip switch
【Symbol Description】
HPS
TD
TE(1)
TS
TA
PMV
LD1-3
SW01,02
symbol description
High pressure switch
LPS Low pressure switch
Exhaust temperature sensor
Defrost temperature sensor
Intake temperature sensor
TC
Tube temperature sensor
outdoor temperature sensor
Electronic expansion valve
Digital display tube
Rotary dial
PC
PC connection tooling
Tfin
Module temperature sensor
1
The control box is equipped with high-voltage components
Please turn off the power and keep the unit shut down for more than 10 minutes and ensure that voltage between P and N
on the frequency conversion board is reduced to DC 20V or less before checking the inside of the control box.

14
【Dial Code Description 】
【Symbol Description】
SYMBOL Description
ACL Live line
ACN Neutral line
HEATER Compressor heating belt
SV1 Unloading solenoid valve
SV2 Jet solenoid valve
4WV Four-way valve
CA AC fan capacitor
DCFAN1 DC fan above
DCFAN2 DC fan below
LED1-4 Indicator light
SW1-4 Button
BM1,2 Dip switch
SYMBOL Description
HPS High pressure switch
LPS Low pressure switch
TD Exhaust temperature sensor
TE(1) Defrost temperature sensor
TC Tube temperature sensor
TS Intake temperature sensor
TA Outdoor temperature sensor
PMV Electronic expansion valve
LD1-3 Digital display tube
AW01,02 Rotary dial
Tn Module temperature sensor
PC PC PC connection tooling
Dial (1) (2) (3) (4) (5) (6) (7) (8) Model 0 represent OFF
1 represent ON
- represent need to be setting when installing
BM1-1100000
BM2 0 01100004.0
1 0 0 5.0

15
8. Performance Curves
(1) Calculation method of cooling capacity
----cooling capacity to be known = cooling capacity*(A*B*C*D*E) W
E. Capacity compensation value of pipe
length, pipe diameter and height drop
C. Capacity modication value under
airow ariation rate of indoor unit group
(only for duct unit)
A. Capacity compensation value of indoor
air wet-bulb temperature condition
B. Capacity compensation value of outdoor
air dry-bulb temperature condition
D. Capacity compensation suitable for
total capability of indoor unit group
1.2
1.1
1.0
0.9
0.8
15 20 24
Indoor air wet-bulb temperature (°C )
Capacity modication value
1.2
1.1
1.0
0.9
Outdoor air dry-bulb temperature (°C )
Capacity modication value
-5 200 255 3010 3515 40 43
1.1
1.0
0.9
80 90 100 110 120
Airow variation rate (%)
Capacity modication value
120
100
100 120 130
80
60
40
20
20 40 60 80
0
Total capacity of indoor unit group (%)
Standard capacity
Capacity modication value

16
(2) Calculation method of heating capacity
----heating capacity to be known = heating capacity*(A*B*C*D*E*F) W
A. Capacity compensation value of indoor
air dry-bulb temperature condition
C. Capacity modication value under airow
variation rate of indoor unit group (only for
duct unit)
B. Capacity compensation value of outdoor air
wet-bulb temperature condition
D. Capacity compensation suitable for
total capability of indoor unit group
1.2
1.2
1.1
1.0
0.9
0.8 15 20 24
Indoor air dry-bulb temperature (°C)
1.1
1.0
0.7
0.9
0.6
0.8
0.5
-15 -10 -5 0
Outdoor air wet-bulb temperature (°C)
510 15
1.1
1.0
0.9
80 90 100 110 120
Airow variation rate (%)
Capacity modication value
120
100
100 120 140
80
60
40
20
20 40 60 80
0
Total capacity of indoor unit group (%)
Standard capacity
Capacity modication value
Capacity modication value Capacity modication value
Notes for E:
(1) The main pipe (from outdoor to the rst branch pipe) diameter should be enlarged one size
when the single way pipe length is over 90m.
(2) When in cooling mode, outdoor is lower than indoor; or when in heating mode, outdoor is higher than indoor, the
compensation factor should be decreased the below value from gure E.
Vertical height drop between
indoor and outdoor 5m 10m 15m 20m 25m 30m
Adjustment factor 0.003 0.006 0.009 0.012 0.015 0.018

17
E. Capacity compensation value of pipe
length, pipe diameter and height drop
F. Capacity compensation value for defrost
capability of outdoor heat exchanger
Capacity compensation value
Outdoor air wet-bulb temperature (°C)
1.0
0.9
0.8
-15 -10 -5 0 5 10
Vertical height drop between
indoor and outdoor 5m 10m 15m 20m 25m 30m
Adjustment factor 0.003 0.006 0.009 0.012 0.015 0.018
Notes for E:
(1) The main pipe (from outdoor to the rst branch pipe) diameter should be enlarged one size
when the single way pipe length is over 90m.
(2) When in cooling mode, outdoor is lower than indoor; or when in heating mode, outdoor is higher than indoor, the
compensation factor should be decreased the below value from gure E.

18
(1) Correction factor for pipe length and drop.
In cooling
Drop
(m)
Single pipe length from the farthest outdoor unit to the farthest indoor unit(m)
0 10 20 30 40 50 60 70
30 0.000 0.000 0.000 0.920 0.890 0.872 0.861 0.840
20 0.000 0.000 0.947 0.920 0.890 0.872 0.861 0.840
10 0.000 0.980 0.947 0.920 0.890 0.872 0.861 0.840
0 1.000 0.980 0.947 0.920 0.890 0.872 0.861 0.840
-10 0.000 0.972 0.935 0.912 0.881 0.868 0.855 0.832
-20 0.000 0.000 0.930 0.908 0.875 0.862 0.851 0.830
In heating
Drop
(m)
Single pipe length from the farthest outdoor unit to the farthest indoor unit(m)
0 10 20 30 40 50 60 70
50 0.000 0.000 0.000 0.910 0.885 0.878 0.861 0.847
40 0.000 0.000 0.935 0.917 0.890 0.882 0.864 0.849
30 0.000 0.994 0.945 0.923 0.895 0.886 0.867 0.852
20 1.000 0.995 0.955 0.930 0.900 0.890 0.870 0.855
10 0.000 0.995 0.955 0.930 0.900 0.890 0.870 0.855
0 0.000 0.000 0.955 0.930 0.900 0.890 0.870 0.855
In defrosting
Correction factor for integrated heating capacity(C)
Outdoor air Temp.
(WB-OC/RH85%) 6 4 2 1 0 -2 -4 -6 -8 -10 -20
Correction
factor for
defrosting
4HP 1.00 0.98 0.87 0.86 0.85 0.89 0.92 0.94 0.95 0.95 0.95
5HP 1.00 0.97 0.88 0.86 0.86 0.90 0.92 0.94 0.95 0.95 0.95