advertisement
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-HJ25VA
MUZ-HJ35VA
-
-
E1
E1
HFC
utilized
R410A
No. OBH648
Indoor unit service manual
MSZ-HJ•VA Series (OBH647)
MUZ-HJ25VA
MUZ-HJ35VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. PERFORMANCE CURVES ······························· 9
9. ACTUATOR CONTROL ··································· 18
10. SERVICE FUNCTIONS ···································· 19
11. TROUBLESHOOTING ····································· 19
12. DISASSEMBLY INSTRUCTIONS ···················· 33
PARTS CATALOG (OBB648)
Use the specifi ed refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
OBH648
2
1
TECHNICAL CHANGES
MUZ-HJ25VA -
E1
MUZ-HJ35VA -
E1
1. New model
2
PART NAMES AND FUNCTIONS
MUZ-HJ25VA MUZ-HJ35VA
Air inlet
(Back and side)
Piping
Drain hose
Air outlet
Drain outlet
ACCESSORIES
Drain socket 1
OBH648
3
3
SPECIFICATION
Outdoor model
MUZ-HJ25VA MUZ-HJ35VA
Capacity
Power supply
Cooling
Rated frequency (Min.-Max.)
Heating
Breaker Capacity
Power input 1 (Total)
Running current 1
(Total)
Cooling
Heating
Cooling kW
A
W
Power factor 1 (Total)
Cooling
Heating
%
Starting current 1 (Total) A
Coeffi cient of performance
(COP) 1 (Total)
Cooling
Heating
Model
Output
Compressor
Current 1
Cooling
Heating
Refrigeration oil (Model)
Model
Fan motor
Current 1
Dimensions W × H × D
Weight
Dehumidifi cation Cooling
W
A
L
A mm kg
/h
Air fl ow 1 m 3 /h
Sound level 1
Cooling
Heating dB(A) rpm Fan speed
Fan speed regulator
Refrigerant fi lling capacity (R410A) kg
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry-bulb temperature 27°C
Outdoor Dry-bulb temperature 35°C
Heating: Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C
Refrigerant piping length (one way): 5 m
1 Measured under rated operating frequency.
Specifi cations and rated conditions of main electric parts
Model
Item
Smoothing capacitor
Diode module
Fuse
Power module
Expansion valve coil
Reactor
Switching power transistor
Circuit protection
Terminal block
Relay
R.V. coil
(C61)
(DB61)
(DB65)
(F701, F801)
(IC700)
(LEV)
(L61)
(IC821)
(PTC64)
(TB)
(X61)
(X63)
(X64)
(21S4)
Single phase, 230 V, 50 Hz
2.5 (1.3 - 3.0) 3.15 (1.4 - 3.5)
3.15 (0.9 - 3.5) 3.6 (1.1 - 4.1)
10
730
870
3.7
1,040
995
4.9
4.8
85
90
4.2
3.42
3.62
KNB065FUJHC
500
3.3
3.8
92
90
4.9
3.03
3.62
KNB073FUVHC
550
4.4
4.4
0.32 (NEO22)
RA6V21-BD
0.23
699 × 538 × 249
24
0.4
1,890
50
50
840
1
0.70
25
0.6
1,890
50
50
840
1
0.72
Wet-bulb temperature 19°C
Wet-bulb temperature 6°C
MUZ-HJ25VA
8 A 600 V
800 μF 420 V
15 A 600 V
10 A 600 V
T3.15AL250V
12 VDC
18 mH
30 A 600 V
33 Ω
3 P
3 A 250 V
3 A 250 V
20 A 250 V
220 - 240 VAC
MUZ-HJ35VA
10 A 600 V
OBH648
4
4
NOISE CRITERIA CURVES
MUZ-HJ25VA MUZ-HJ35VA
FUNCTION SPL(dB(A))
COOLING
HEATING
50
50
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
20
10
NC-30
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63 125
NC-20
250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
FUNCTION SPL(dB(A))
COOLING 50
HEATING 50
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
20
10
NC-30
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63 125
NC-20
250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling : Dry-bulb temperature 35°C
Heating : Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
1m
MICROPHONE
OBH648
5
5
OUTLINES AND DIMENSIONS
MUZ-HJ25VA MUZ-HJ35VA
REQUIRED SPACE
Air in
Drain hole ø33
100 mm or more
100 mm or more
Air in
Unit : mm
100 mm or more
349.5
Air out
2 - 10.3 X 19.3 Oval hole
200 mm or more
350 mm or more
17.9
249
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø9.52
40°
43°
121
259
500
699 55.7
121.4
OBH648
6
6
WIRING DIAGRAM
MUZ-HJ25VA
MUZ-HJ35VA
OBH648
7
7
REFRIGERANT SYSTEM DIAGRAM
MUZ-HJ25VA MUZ-HJ35VA
Refrigerant pipe ø9.52
(with heat insulator)
Flared connection
Muffler
(HJ35 only)
4-way valve
Stop valve
(with service port)
Discharge temperature thermistor
RT62
Muffler
Compressor
Outdoor heat exchanger
Defrost thermistor
RT61
Strainer
#100
Flared connection
Capillary tube
ø
3.0 ×
ø
1.4 × 260
Refrigerant pipe ø6.35
(with heat insulator)
Stop valve
(with strainer)
LEV
R.V. coil heating OFF cooling ON
Refrigerant flow in cooling
Refrigerant flow in heating
Unit : mm
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping: m
Max. Length
A
Max. Height difference
B Gas
Piping size O.D: mm
Liquid
MUZ-HJ25VA
MUZ-HJ35VA
20 12 9.52
6.35
Indoor unit
Max. Height difference
B
Max. Length
A
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A : g)
Model
MUZ-HJ25VA
MUZ-HJ35VA
Outdoor unit precharged
700
720
Refrigerant piping length (one way)
5 m 6 m 7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 20 m
0 0 0 20 40 60 80 100 120 140 160 260
Calculation: X g = 20 g/m (Refrigerant piping length (m) - 7)
NOTE : Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.
OBH648
8
8 PERFORMANCE CURVES
MUZ-HJ25VA MUZ-HJ35VA
The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198 ~ 264 V, 50 Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :
(2) Indoor outlet air wet-bulb temperature :
(3) Outdoor intake air dry-bulb temperature :
(4) Total input:
(5) Indoor intake air dry-bulb temperature :
°C WB
°C WB
°C DB
W
°C DB
}
Cooling
(6) Outdoor intake air wet-bulb temperature :
(7) Total input :
}
Heating
Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service.
°C WB
W
How to measure the indoor air wet and dry bulb temperature difference
1. Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.
2. Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT OUTDOOR UNIT
Wet and dry bulb thermometers
FRONT VIEW
Wet and dry bulb thermometers
BACK VIEW
OBH648
9
8-1. CAPACITY AND INPUT CURVES
5.6
5.1
4.6
4.1
7.2
6.7
6.1
5.6
5.1
4.5
8.0
7.4
6.8
6.2
Cooling capacity
1.5
1.4
1.3
1.2
1.1
1.0
0.9
Indoor intake air W et-bulb temperat ure (°C)
26
24
18 20 25 30 35
Outdoor intake air Dry-bulb temperature (°C)
40 45 46
22
20
18
6.1
5.6
5.1
4.6
4.1
3.6
6.8
6.2
5.6
5.1
4.5
4.0
1.3
1.2
1.1
Total input (cooling)
26
24
1.0
0.9
0.8
18 20 25
Indoor
intake air W et-bulb temperature (°C)
30 35
Outdoor intake air Dry-bulb temperature (°C)
40 45 46
22
20
18
20.6
19.0
17.4
15.8
14.3
12.7
11.1
9.5
22.9
21.1
19.3
17.6
15.8
14.1
12.3
10.5
Indoor intake ai r Drybulb temperature (°C)
Indoor
intake air Drybulb temperat ure (°C)
Outdoor intake air Wet-bulb temperature (°C)
Outdoor intake air Wet-bulb temperature (°C)
NOTE: The above broken lines are for the heating operation without any frost and
defrost operation.
OBH648
10
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR
MUZ-HJ25VA
1.5
Correction of Cooling capacity
1.5
Correction of Cooling total input
1.5
Correction of Heating capacity
1.5
Correction of Heating total input
1.0
0.5
1.0
0.5
1.0
0.5
1.0
0.5
0 50 100
150 (Hz)
0 50 100
150 (Hz)
0 50 100
150 (Hz)
0 50 100
150 (Hz)
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
1.0
0.5
MUZ-HJ35VA
1.5
Correction of Cooling capacity
1.5
Correction of Cooling total input
1.5
Correction of Heating capacity
1.5
Correction of Heating total input
1.0
0.5
1.0
0.5
1.0
0.5
0 50 100
150 (Hz)
0 50 100
150 (Hz)
0 50 100
150 (Hz)
0 50 100
150 (Hz)
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
8-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION
<Test run operation>
1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller.
OBH648
11
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
Both indoor and outdoor unit are under the same temperature/humidity condition.
Operation: TEST RUN OPERATION (Refer to 8-3.)
Outdoor low pressure
MUZ-HJ25VA
(kgf/cm
2
[Gauge])(MPa [Gauge])
9
0.9
MUZ-HJ35VA
(kgf/cm
2
[Gauge])(MPa [Gauge])
8
0.8
Dry-bulb temperature (°C) Relative humidity (%)
20 50
25
30
60
70
8
0.8
7
0.7
7
0.7
6
0.6
6
0.6
5
0.5
5
0.5
4
0.4
4 0.4
15 18 20
50
25
60
30
70
32
Ambient temperature(°C)
Ambient humidity(%)
35
(°C)
(%)
3 0.3
15 18 20
50
25
60
30
70
32
Ambient temperature(°C)
Ambient humidity(%)
35
(°C)
(%)
NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system).
The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm
2
[Gauge])
Outdoor unit current
MUZ-HJ25VA
5 6
MUZ-HJ35VA
4
3
5
4
2
15
18
20
50
25
60
30
70
32
Ambient temperature (°C)
Ambient humidity(%)
35
(°C)
(%)
HEAT operation
Condition:
Indoor
Dry bulb temperature (°C) 20.0
Wet bulb temperature (°C) 14.5
Operation: Test run operation (refer to 8-3.)
3
15
18
20
50
25
60
30
70
32
Ambient temperature (°C)
Ambient humidity(%)
35
(°C)
(%)
2
1
Outdoor
7 15 20.0
6 12 14.5
Outdoor unit current
3.0
MUZ-HJ25VA
3.0
MUZ-HJ35VA
2.5
2.0
1.5
0 5 10 15 20
Ambient temperature (°C)
25
OBH648
2.5
2.0
1.5
0 5 10 15 20
Ambient temperature (°C)
25
12
PERFORMANCE DATA COOL operation a t Rated frequency
MUZ-HJ25VA
CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W
INDOOR
DB (°C)
INDOOR
WB (°C)
22
24
26
18
20
22
24
26
18
20
26
18
20
22
22
24
26
24
26
18
20
24
26
18
20
22
24
26
18
20
22
18
20
22
24
18
20
22
24
18
20
22
24
20
22
18
20
18
20
22
18
30
30
30
31
31
31
29
29
30
30
28
29
29
29
32
32
32
31
31
32
32
27
27
28
28
28
28
26
27
27
27
26
26
26
26
21
21
24
24
25
25
25
25
23
23
24
24
22
22
22
23
3.35
1.98
0.59
3.45
1.62
0.47
2.94
2.91
0.99
3.06
2.66
0.87
3.19
2.39
0.75
3.35
2.11
0.63
3.45
1.76
0.51
2.94
2.94
1.00
3.06
2.79
0.91
3.19
2.52
0.79
3.35
2.24
0.67
3.45
1.90
0.55
2.94
2.94
1.00
3.06
2.91
0.95
3.19
2.65
0.83
3.35
2.38
0.71
3.45
2.04
0.59
2.94
2.94
1.00
3.06
3.03
0.99
3.19
2.77
0.87
3.35
2.51
0.75
3.45
2.17
0.63
2.94
2.94
1.00
3.06
3.06
1.00
3.19
2.90
0.91
3.35
2.65
0.79
3.45
2.31
0.67
OUTDOOR DB (°C)
21 25 27 30
Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
2.94
2.09
0.71
3.06
1.81
0.59
584
613
2.81
2.94
2.00
1.73
0.71
0.59
613
650
2.70
2.85
1.92
1.68
0.71
0.59
642
664
2.60
2.75
1.85
1.62
0.71
0.59
672
694
2.94
2.20
0.75
3.06
1.93
0.63
3.19
1.63
0.51
2.94
2.32
0.79
584
613
635
584
2.81
2.94
3.08
2.81
2.11
1.85
1.57
2.22
0.75
0.63
0.51
0.79
613
650
675
613
2.70
2.85
3.00
2.70
2.03
1.80
1.53
2.13
0.75
0.63
0.51
0.79
642
664
694
642
2.60
2.75
2.88
2.60
1.95
1.73
1.47
2.05
0.75
0.63
0.51
0.79
672
694
723
672
3.06
2.05
0.67
3.19
1.75
0.55
2.94
2.44
0.83
3.06
2.17
0.71
613 2.94
1.97
0.67
650 2.85
1.91
0.67
664 2.75
1.84
0.67
694
635 3.08
1.69
0.55
675 3.00
1.65
0.55
694 2.88
1.58
0.55
723
584 2.81
2.33
0.83
613 2.70
2.24
0.83
642 2.60
2.16
0.83
672
613 2.94
2.09
0.71
650 2.85
2.02
0.71
664 2.75
1.95
0.71
694
3.19
1.88
0.59
3.35
1.57
0.47
2.94
2.56
0.87
3.06
2.30
0.75
3.19
2.01
0.63
3.35
1.71
0.51
2.94
2.67
0.91
3.06
2.42
0.79
3.19
2.14
0.67
3.35
1.84
0.55
3.45
1.48
0.43
2.94
2.79
0.95
3.06
2.54
0.83
3.19
2.26
0.71
635
664
584
613
635
664
584
613
635
664
701
584
613
635
3.08
3.23
2.81
2.94
3.08
3.23
2.81
2.94
3.08
3.23
3.35
2.81
2.94
3.08
1.81
1.52
2.45
2.20
1.94
1.64
2.56
2.32
2.06
1.77
1.44
2.67
2.44
2.18
0.59
0.47
0.87
0.75
0.63
0.51
0.91
0.79
0.67
0.55
0.43
0.95
0.83
0.71
675
701
613
650
675
701
613
650
675
701
737
613
650
675
3.00
3.15
2.70
2.85
3.00
3.15
2.70
2.85
3.00
3.15
3.30
2.70
2.85
3.00
1.77
1.48
2.35
2.14
1.89
1.61
2.46
2.25
2.01
1.73
1.42
2.57
2.37
2.13
0.59
0.47
0.87
0.75
0.63
0.51
0.91
0.79
0.67
0.55
0.43
0.95
0.83
0.71
694
723
642
664
694
723
642
664
694
723
759
642
664
694
2.88
3.05
2.60
2.75
2.88
3.05
2.60
2.75
2.88
3.05
3.20
2.60
2.75
2.88
1.70
1.43
2.26
2.06
1.81
1.56
2.37
2.17
1.93
1.68
1.38
2.47
2.28
2.04
0.59
0.47
0.87
0.75
0.63
0.51
0.91
0.79
0.67
0.55
0.43
0.95
0.83
0.71
723
759
672
694
723
759
672
694
723
759
781
672
694
723
664 3.23
1.90
0.59
701 3.15
1.86
0.59
723 3.05
1.80
0.59
759
701 3.35
1.57
0.47
737 3.30
1.55
0.47
759 3.20
1.50
0.47
781
584 2.81
2.78
0.99
613 2.70
2.67
0.99
642 2.60
2.57
0.99
672
613 2.94
2.56
0.87
650 2.85
2.48
0.87
664 2.75
2.39
0.87
694
635 3.08
2.31
0.75
675 3.00
2.25
0.75
694 2.88
2.16
0.75
723
664 3.23
2.03
0.63
701 3.15
1.98
0.63
723 3.05
1.92
0.63
759
701 3.35
1.71
0.51
737 3.30
1.68
0.51
759 3.20
1.63
0.51
781
584 2.81
2.81
1.00
613 2.70
2.70
1.00
642 2.60
2.60
1.00
672
613 2.94
2.67
0.91
650 2.85
2.59
0.91
664 2.75
2.50
0.91
694
635 3.08
2.43
0.79
675 3.00
2.37
0.79
694 2.88
2.27
0.79
723
664 3.23
2.16
0.67
701 3.15
2.11
0.67
723 3.05
2.04
0.67
759
701 3.35
1.84
0.55
737 3.30
1.82
0.55
759 3.20
1.76
0.55
781
584
613
584
613
635
664
701
2.81
2.94
635 3.08
2.55
0.83
675 3.00
2.49
0.83
694 2.88
2.39
0.83
723
664 3.23
2.29
0.71
701 3.15
2.24
0.71
723 3.05
2.17
0.71
759
701 3.35
1.98
0.59
737 3.30
1.95
0.59
759 3.20
1.89
0.59
781
584 2.81
2.81
1.00
613 2.70
2.70
1.00
642 2.60
2.60
1.00
672
613 2.94
2.91
0.99
650 2.85
2.82
0.99
664 2.75
2.72
0.99
694
635 3.08
2.68
0.87
675 3.00
2.61
0.87
694 2.88
2.50
0.87
723
664 3.23
2.42
0.75
701 3.15
2.36
0.75
723 3.05
2.29
0.75
759
701 3.35
2.11
0.63
737 3.30
2.08
0.63
759 3.20
2.02
0.63
781
2.81
2.94
3.08
3.23
3.35
2.81
2.79
2.81
2.94
2.80
2.55
2.24
1.00
0.95
1.00
1.00
0.91
0.79
0.67
613
650
613
650
675
701
737
2.70
2.85
2.70
2.85
3.00
3.15
3.30
2.70
2.71
2.70
2.85
2.73
2.49
2.21
1.00
0.95
1.00
1.00
0.91
0.79
0.67
642
664
642
664
694
723
759
2.60
2.75
2.60
2.75
2.88
3.05
3.20
2.60
2.61
2.60
2.75
2.62
2.41
2.14
1.00
0.95
1.00
1.00
0.91
0.79
0.67
672
694
672
694
723
759
781
NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature
SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature
OBH648
13
PERFORMANCE DATA COOL operation a t Rated frequency
MUZ-HJ25VA
CAPACITY: 2.5 kW SHF: 0.89 INPUT: 730 W
INDOOR
DB (°C)
INDOOR
WB (°C)
24
26
18
20
26
18
20
22
22
24
26
24
26
18
20
22
24
26
18
20
22
18
20
22
24
26
18
20
22
24
26
18
20
22
24
18
20
22
24
22
18
20
22
18
20
18
20
18
20
22
24
31
31
32
32
30
31
31
31
32
32
32
29
29
30
30
30
30
28
29
29
29
28
28
28
28
26
27
27
27
27
27
26
26
26
26
25
25
25
25
22
23
23
23
21
21
22
22
24
24
24
24
OUTDOOR DB (°C)
35 40 46
Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
2.45
1.74
0.71
715 2.25
1.60
0.71
759 2.08
1.47
0.71
788
2.58
1.52
0.59
745 2.40
1.42
0.59
781 2.23
1.31
0.59
825
2.45
1.84
0.75
715 2.25
1.69
0.75
759 2.08
1.56
0.75
788
2.58
1.62
0.63
745 2.40
1.51
0.63
781 2.23
1.40
0.63
825
2.73
1.39
0.51
774 2.55
1.30
0.51
818 2.38
1.21
0.51
847
2.45
1.94
0.79
715 2.25
1.78
0.79
759 2.08
1.64
0.79
788
2.58
1.73
0.67
745 2.40
1.61
0.67
781 2.23
1.49
0.67
825
2.73
1.50
0.55
774 2.55
1.40
0.55
818 2.38
1.31
0.55
847
2.45
2.03
0.83
715 2.25
1.87
0.83
759 2.08
1.72
0.83
788
2.58
1.83
0.71
745 2.40
1.70
0.71
781 2.23
1.58
0.71
825
2.73
1.61
0.59
774 2.55
1.50
0.59
818 2.38
1.40
0.59
847
2.88
1.35
0.47
803 2.70
1.27
0.47
839 2.55
1.20
0.47
876
2.45
2.13
0.87
715 2.25
1.96
0.87
759 2.08
1.81
0.87
788
2.58
1.93
0.75
745 2.40
1.80
0.75
781 2.23
1.67
0.75
825
2.73
1.72
0.63
774 2.55
1.61
0.63
818 2.38
1.50
0.63
847
2.88
1.47
0.51
803 2.70
1.38
0.51
839 2.55
1.30
0.51
876
2.45
2.23
0.91
715 2.25
2.05
0.91
759 2.08
1.89
0.91
788
2.58
2.03
0.79
745 2.40
1.90
0.79
781 2.23
1.76
0.79
825
2.73
1.83
0.67
774 2.55
1.71
0.67
818 2.38
1.59
0.67
847
2.88
1.58
0.55
803 2.70
1.49
0.55
839 2.55
1.40
0.55
876
3.03
1.30
0.43
832 2.85
1.23
0.43
869 2.68
1.15
0.43
905
2.45
2.33
0.95
715 2.25
2.14
0.95
759 2.08
1.97
0.95
788
2.58
2.14
0.83
745 2.40
1.99
0.83
781 2.23
1.85
0.83
825
2.73
1.93
0.71
774 2.55
1.81
0.71
818 2.38
1.69
0.71
847
2.88
1.70
0.59
803 2.70
1.59
0.59
839 2.55
1.50
0.59
876
3.03
1.42
0.47
832 2.85
1.34
0.47
869 2.68
1.26
0.47
905
2.45
2.43
0.99
715 2.25
2.23
0.99
759 2.08
2.05
0.99
788
2.58
2.24
0.87
745 2.40
2.09
0.87
781 2.23
1.94
0.87
825
2.73
2.04
0.75
774 2.55
1.91
0.75
818 2.38
1.78
0.75
847
2.88
1.81
0.63
803 2.70
1.70
0.63
839 2.55
1.61
0.63
876
3.03
1.54
0.51
832 2.85
1.45
0.51
869 2.68
1.36
0.51
905
2.45
2.45
1.00
715 2.25
2.25
1.00
759 2.08
2.08
1.00
788
2.58
2.34
0.91
745 2.40
2.18
0.91
781 2.23
2.02
0.91
825
2.73
2.15
0.79
774 2.55
2.01
0.79
818 2.38
1.88
0.79
847
2.88
1.93
0.67
803 2.70
1.81
0.67
839 2.55
1.71
0.67
876
3.03
1.66
0.55
832 2.85
1.57
0.55
869 2.68
1.47
0.55
905
2.45
2.45
1.00
715 2.25
2.25
1.00
759 2.08
2.08
1.00
788
2.58
2.45
0.95
745 2.40
2.28
0.95
781 2.23
2.11
0.95
825
2.73
2.26
0.83
774 2.55
2.12
0.83
818 2.38
1.97
0.83
847
2.88
2.04
0.71
803 2.70
1.92
0.71
839 2.55
1.81
0.71
876
3.03
1.78
0.59
832 2.85
1.68
0.59
869 2.68
1.58
0.59
905
2.45
2.45
1.00
715 2.25
2.25
1.00
759 2.08
2.08
1.00
788
2.58
2.55
0.99
745 2.40
2.38
0.99
781 2.23
2.20
0.99
825
2.73
2.37
0.87
774 2.55
2.22
0.87
818 2.38
2.07
0.87
847
2.88
2.16
0.75
803 2.70
2.03
0.75
839 2.55
1.91
0.75
876
3.03
1.91
0.63
832 2.85
1.80
0.63
869 2.68
1.69
0.63
905
2.45
2.45
1.00
715 2.25
2.25
1.00
759 2.08
2.08
1.00
788
2.58
2.58
1.00
745 2.40
2.40
1.00
781 2.23
2.23
1.00
825
2.73
2.48
0.91
774 2.55
2.32
0.91
818 2.38
2.16
0.91
847
2.88
2.27
0.79
803 2.70
2.13
0.79
839 2.55
2.01
0.79
876
3.03
2.03
0.67
832 2.85
1.91
0.67
869 2.68
1.79
0.67
905
NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature
SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature
OBH648
14
PERFORMANCE DATA COOL operation a t Rated frequency
MUZ-HJ35VA
CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W
INDOOR
DB (°C)
INDOOR
WB (°C)
24
26
18
20
26
18
20
22
22
24
26
24
26
18
20
22
24
26
18
20
22
18
20
22
24
26
18
20
22
24
26
18
20
22
24
18
20
22
24
22
18
20
22
18
20
18
20
18
20
22
24
31
31
32
32
30
31
31
31
32
32
32
29
29
30
30
30
30
28
29
29
29
28
28
28
28
26
27
27
27
27
27
26
26
26
26
25
25
25
25
22
23
23
23
21
21
22
22
24
24
24
24
OUTDOOR DB (°C)
21 25 27 30
Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
3.70
2.55
0.69
832 3.54
2.45
0.69
874 3.40
2.35
0.69
915 3.28
2.26
0.69
957
3.86
2.20
0.57
874 3.70
2.11
0.57
926 3.59
2.05
0.57
3.70
2.70
0.73
832 3.54
2.59
0.73
874 3.40
2.48
0.73
3.86
2.35
0.61
874 3.70
2.26
0.61
926 3.59
2.19
0.61
4.02
1.97
0.49
905 3.87
1.90
0.49
962 3.78
1.85
0.49
3.70
2.85
0.77
832 3.54
2.73
0.77
874 3.40
2.62
0.77
946
915
946
988
915
3.47
3.28
3.47
3.62
3.28
1.98
2.39
2.11
1.78
2.52
0.57
0.73
0.61
0.49
0.77
988
957
988
1030
957
3.86
2.51
0.65
874 3.70
2.41
0.65
926 3.59
2.33
0.65
4.02
2.13
0.53
905 3.87
2.05
0.53
962 3.78
2.00
0.53
3.70
3.00
0.81
832 3.54
2.87
0.81
874 3.40
2.76
0.81
3.86
2.66
0.69
874 3.70
2.55
0.69
926 3.59
2.48
0.69
946 3.47
2.25
0.65
988
988 3.62
1.92
0.53
1030
915 3.28
2.65
0.81
957
946 3.47
2.39
0.69
988
4.02
2.29
0.57
905 3.87
2.21
0.57
962 3.78
2.15
0.57
988 3.62
2.06
0.57
1030
4.22
1.90
0.45
946 4.06
1.83
0.45
998 3.97
1.79
0.45
1030 3.84
1.73
0.45
1082
3.70
3.15
0.85
832 3.54
3.01
0.85
874 3.40
2.89
0.85
3.86
2.82
0.73
874 3.70
2.70
0.73
926 3.59
2.62
0.73
915
946
3.28
3.47
2.78
2.53
0.85
0.73
957
988
4.02
2.45
0.61
905 3.87
2.36
0.61
962 3.78
2.31
0.61
988 3.62
2.21
0.61
1030
4.22
2.07
0.49
946 4.06
1.99
0.49
998 3.97
1.94
0.49
1030 3.84
1.88
0.49
1082
3.70
3.29
0.89
832 3.54
3.15
0.89
874 3.40
3.03
0.89
3.86
2.97
0.77
874 3.70
2.85
0.77
926 3.59
2.77
0.77
915
946
3.28
3.47
2.92
2.67
0.89
0.77
957
988
4.02
2.61
0.65
905 3.87
2.52
0.65
962 3.78
2.46
0.65
988 3.62
2.35
0.65
1030
4.22
2.24
0.53
946 4.06
2.15
0.53
998 3.97
2.10
0.53
1030 3.84
2.04
0.53
1082
4.35
1.78
0.41
998 4.22
1.73
0.41
1050 4.16
1.70
0.41
1082 4.03
1.65
0.41
1113
3.70
3.44
0.93
832 3.54
3.30
0.93
874 3.40
3.16
0.93
3.86
3.13
0.81
874 3.70
3.00
0.81
926 3.59
2.91
0.81
915 3.28
3.05
0.93
957
946 3.47
2.81
0.81
988
4.02
2.77
0.69
905 3.87
2.67
0.69
962 3.78
2.61
0.69
988 3.62
2.50
0.69
1030
4.22
2.41
0.57
946 4.06
2.32
0.57
998 3.97
2.26
0.57
1030 3.84
2.19
0.57
1082
4.35
1.96
0.45
998 4.22
1.90
0.45
1050 4.16
1.87
0.45
1082 4.03
1.81
0.45
1113
3.70
3.59
0.97
832 3.54
3.44
0.97
874 3.40
3.30
0.97
915 3.28
3.18
0.97
957
3.86
3.28
0.85
874 3.70
3.15
0.85
926 3.59
3.05
0.85
4.02
2.93
0.73
905 3.87
2.83
0.73
962 3.78
2.76
0.73
946
988
3.47
3.62
2.95
2.64
0.85
0.73
988
1030
4.22
2.57
0.61
946 4.06
2.48
0.61
998 3.97
2.42
0.61
1030 3.84
2.34
0.61
1082
4.35
2.13
0.49
998 4.22
2.07
0.49
1050 4.16
2.04
0.49
1082 4.03
1.98
0.49
1113
3.70
3.70
1.00
832 3.54
3.54
1.00
874 3.40
3.40
1.00
3.86
3.43
0.89
874 3.70
3.29
0.89
926 3.59
3.20
0.89
915
946
3.28
3.47
3.28
3.08
1.00
0.89
957
988
4.02
3.09
0.77
905 3.87
2.98
0.77
962 3.78
2.91
0.77
988 3.62
2.79
0.77
1030
4.22
2.74
0.65
946 4.06
2.64
0.65
998 3.97
2.58
0.65
1030 3.84
2.50
0.65
1082
4.35
2.30
0.53
998 4.22
2.24
0.53
1050 4.16
2.20
0.53
1082 4.03
2.14
0.53
1113
3.70
3.70
1.00
832 3.54
3.54
1.00
874 3.40
3.40
1.00
915 3.28
3.28
1.00
957
3.86
3.59
0.93
874 3.70
3.44
0.93
926 3.59
3.34
0.93
4.02
3.25
0.81
905 3.87
3.14
0.81
962 3.78
3.06
0.81
946
988
3.47
3.62
3.22
2.93
0.93
0.81
988
1030
4.22
2.91
0.69
946 4.06
2.80
0.69
998 3.97
2.74
0.69
1030 3.84
2.65
0.69
1082
4.35
2.48
0.57
998 4.22
2.41
0.57
1050 4.16
2.37
0.57
1082 4.03
2.30
0.57
1113
3.70
3.70
1.00
832 3.54
3.54
1.00
874 3.40
3.40
1.00
3.86
3.74
0.97
874 3.70
3.59
0.97
926 3.59
3.48
0.97
915
946
3.28
3.47
3.28
3.36
1.00
0.97
957
988
4.02
3.41
0.85
905 3.87
3.29
0.85
962 3.78
3.21
0.85
988 3.62
3.08
0.85
1030
4.22
3.08
0.73
946 4.06
2.97
0.73
998 3.97
2.90
0.73
1030 3.84
2.81
0.73
1082
4.35
2.65
0.61
998 4.22
2.57
0.61
1050 4.16
2.54
0.61
1082 4.03
2.46
0.61
1113
3.70
3.70
1.00
832 3.54
3.54
1.00
874 3.40
3.40
1.00
915 3.28
3.28
1.00
957
3.86
3.86
1.00
874 3.70
3.70
1.00
926 3.59
3.59
1.00
4.02
3.57
0.89
905 3.87
3.45
0.89
962 3.78
3.36
0.89
946 3.47
3.47
1.00
988
988 3.62
3.22
0.89
1030
4.22
3.25
0.77
946 4.06
3.13
0.77
998 3.97
3.06
0.77
1030 3.84
2.96
0.77
1082
4.35
2.83
0.65
998 4.22
2.74
0.65
1050 4.16
2.70
0.65
1082 4.03
2.62
0.65
1113
NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature
SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature
OBH648
15
PERFORMANCE DATA COOL operation a t Rated frequency
MUZ-HJ35VA
CAPACITY: 3.15 kW SHF: 0.87 INPUT: 1040 W
INDOOR
DB (°C)
INDOOR
WB (°C)
24
26
18
20
26
18
20
22
22
24
26
24
26
18
20
22
24
26
18
20
22
18
20
22
24
26
18
20
22
24
26
18
20
22
24
18
20
22
24
22
18
20
22
18
20
18
20
18
20
22
24
31
31
32
32
30
31
31
31
32
32
32
29
29
30
30
30
30
28
29
29
29
28
28
28
28
26
27
27
27
27
27
26
26
26
26
25
25
25
25
22
23
23
23
21
21
22
22
24
24
24
24
OUTDOOR DB (°C)
35 40 46
Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT
3.09
2.13
0.69
1019 2.84
1.96
0.69
1082 2.61
1.80
0.69
1123
3.24
1.85
0.57
1061 3.02
1.72
0.57
1113 2.80
1.60
0.57
1175
3.09
2.25
0.73
1019 2.84
2.07
0.73
1082 2.61
1.91
0.73
1123
3.24
1.98
0.61
1061 3.02
1.84
0.61
1113 2.80
1.71
0.61
1175
3.43
1.68
0.49
1102 3.21
1.57
0.49
1165 2.99
1.47
0.49
1206
3.09
2.38
0.77
1019 2.84
2.18
0.77
1082 2.61
2.01
0.77
1123
3.24
2.11
0.65
1061 3.02
1.97
0.65
1113 2.80
1.82
0.65
1175
3.43
1.82
0.53
1102 3.21
1.70
0.53
1165 2.99
1.59
0.53
1206
3.09
2.50
0.81
1019 2.84
2.30
0.81
1082 2.61
2.12
0.81
1123
3.24
2.24
0.69
1061 3.02
2.09
0.69
1113 2.80
1.93
0.69
1175
3.43
1.96
0.57
1102 3.21
1.83
0.57
1165 2.99
1.71
0.57
1206
3.62
1.63
0.45
1144 3.40
1.53
0.45
1196 3.21
1.45
0.45
1248
3.09
2.62
0.85
1019 2.84
2.41
0.85
1082 2.61
2.22
0.85
1123
3.24
2.37
0.73
1061 3.02
2.21
0.73
1113 2.80
2.05
0.73
1175
3.43
2.09
0.61
1102 3.21
1.96
0.61
1165 2.99
1.83
0.61
1206
3.62
1.78
0.49
1144 3.40
1.67
0.49
1196 3.21
1.57
0.49
1248
3.09
2.75
0.89
1019 2.84
2.52
0.89
1082 2.61
2.33
0.89
1123
3.24
2.50
0.77
1061 3.02
2.33
0.77
1113 2.80
2.16
0.77
1175
3.43
2.23
0.65
1102 3.21
2.09
0.65
1165 2.99
1.95
0.65
1206
3.62
1.92
0.53
1144 3.40
1.80
0.53
1196 3.21
1.70
0.53
1248
3.81
1.56
0.41
1186 3.59
1.47
0.41
1238 3.37
1.38
0.41
1290
3.09
2.87
0.93
1019 2.84
2.64
0.93
1082 2.61
2.43
0.93
1123
3.24
2.63
0.81
1061 3.02
2.45
0.81
1113 2.80
2.27
0.81
1175
3.43
2.37
0.69
1102 3.21
2.22
0.69
1165 2.99
2.06
0.69
1206
3.62
2.06
0.57
1144 3.40
1.94
0.57
1196 3.21
1.83
0.57
1248
3.81
1.72
0.45
1186 3.59
1.62
0.45
1238 3.37
1.52
0.45
1290
3.09
2.99
0.97
1019 2.84
2.75
0.97
1082 2.61
2.54
0.97
1123
3.24
2.76
0.85
1061 3.02
2.57
0.85
1113 2.80
2.38
0.85
1175
3.43
2.51
0.73
1102 3.21
2.35
0.73
1165 2.99
2.18
0.73
1206
3.62
2.21
0.61
1144 3.40
2.08
0.61
1196 3.21
1.96
0.61
1248
3.81
1.87
0.49
1186 3.59
1.76
0.49
1238 3.37
1.65
0.49
1290
3.09
3.09
1.00
1019 2.84
2.84
1.00
1082 2.61
2.61
1.00
1123
3.24
2.89
0.89
1061 3.02
2.69
0.89
1113 2.80
2.50
0.89
1175
3.43
2.64
0.77
1102 3.21
2.47
0.77
1165 2.99
2.30
0.77
1206
3.62
2.35
0.65
1144 3.40
2.21
0.65
1196 3.21
2.09
0.65
1248
3.81
2.02
0.53
1186 3.59
1.90
0.53
1238 3.37
1.79
0.53
1290
3.09
3.09
1.00
1019 2.84
2.84
1.00
1082 2.61
2.61
1.00
1123
3.24
3.02
0.93
1061 3.02
2.81
0.93
1113 2.80
2.61
0.93
1175
3.43
2.78
0.81
1102 3.21
2.60
0.81
1165 2.99
2.42
0.81
1206
3.62
2.50
0.69
1144 3.40
2.35
0.69
1196 3.21
2.22
0.69
1248
3.81
2.17
0.57
1186 3.59
2.05
0.57
1238 3.37
1.92
0.57
1290
3.09
3.09
1.00
1019 2.84
2.84
1.00
1082 2.61
2.61
1.00
1123
3.24
3.15
0.97
1061 3.02
2.93
0.97
1113 2.80
2.72
0.97
1175
3.43
2.92
0.85
1102 3.21
2.73
0.85
1165 2.99
2.54
0.85
1206
3.62
2.64
0.73
1144 3.40
2.48
0.73
1196 3.21
2.35
0.73
1248
3.81
2.33
0.61
1186 3.59
2.19
0.61
1238 3.37
2.06
0.61
1290
3.09
3.09
1.00
1019 2.84
2.84
1.00
1082 2.61
2.61
1.00
1123
3.24
3.24
1.00
1061 3.02
3.02
1.00
1113 2.80
2.80
1.00
1175
3.43
3.06
0.89
1102 3.21
2.86
0.89
1165 2.99
2.66
0.89
1206
3.62
2.79
0.77
1144 3.40
2.62
0.77
1196 3.21
2.47
0.77
1248
3.81
2.48
0.65
1186 3.59
2.33
0.65
1238 3.37
2.19
0.65
1290
NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature
SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature
OBH648
16
PERFORMANCE DATA HEAT operation at Rated frequency
MUZ-HJ25VA
CAPACITY: 3.15 kW INPUT: 870 W
INDOOR
DB (°C)
15
21
26
Q
1.98
1.89
1.70
-10
INPUT
566
609
653
Q
2.39
2.27
2.11
-5
INPUT
679
722
766
Q
2.80
2.68
2.49
0
INPUT
OUTDOOR WB (°C)
5
Q INPUT
766 3.21
827
Q
3.62
800
844
3.06
2.90
861
905
3.47
3.31
10
INPUT
879
905
948
Q
4.00
3.84
3.69
15
INPUT
905
931
974
Q
4.41
4.24
20
INPUT
922
966
4.10
1001
MUZ-HJ35VA
CAPACITY: 3.6 kW INPUT: 995 W
INDOOR
DB (°C)
15
21
26
Q
2.27
2.16
1.94
-10
INPUT
647
697
746
Q
2.74
2.59
2.41
-5
INPUT
776
826
876
Q
3.20
3.06
2.84
0
INPUT
OUTDOOR WB (°C)
5
Q INPUT
876 3.67
945
Q
4.14
915
965
3.49
3.31
985
1035
3.96
3.78
10
INPUT Q
15
INPUT
1005 4.57
1035
1035 4.39
1065
1085 4.21
1114
Q
20
INPUT
5.04
1055
4.84
1104
4.68
1144
NOTE Q : Total capacity (kW) INPUT : Total power input (W) DB: Dry-bulb temperature WB: Wet-bulb temperature
OBH648
17
9
ACTUATOR CONTROL
MUZ-HJ25VA MUZ-HJ35VA
9-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
5 seconds 15 seconds
ON
Compressor
OFF
ON
Outdoor fan motor
OFF
9-2. R.V. COIL CONTROL
Heating . . . . . . . . . . . . . . . . . OFF
Cooling . . . . . . . . . . . . . . . . . ON
Dry . . . . . . . . . . . . . . . . . . . . ON
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL> <HEAT>
5 seconds 5 seconds
Compressor
ON
OFF
R.V.coil
ON
OFF
Outdoor fan motor
ON
OFF
9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature thermistor
Indoor coil temperature thermistor
Defrost thermistor
Fin temperature thermistor
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protection
Cooling: High pressure protection
Heating: Defrosting
Protection
Compressor LEV
○ ○
Actuator
Outdoor fan motor
R.V. coil
Indoor fan motor
○
○ ○
○ ○
○
○ ○
OBH648
18
10
SERVICE FUNCTIONS
MUZ-HJ25VA MUZ-HJ35VA
10-1. CHANGE IN DEFROST SETTING
<JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to
11-6-1.)
JS
Jumper wire
Soldered
(Initial setting)
None
(Cut)
Defrost fi nish temperature (°C)
8
11
10-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 20°C or below. When pre-heat control is turned ON, compressor is energized. (About 50 W)
<JK> When the JK wire of the inverter P.C. board is cut, pre-heat control is activated. (Refer to 11-6.1)
NOTE : When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
11
TROUBLESHOOTING
MUZ-HJ25VA MUZ-HJ35VA
11-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.
3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
<Incorrect>
<Correct>
Lead wiring
Housing point
3. Troubleshooting procedure
1) Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work.
2) Before servicing, check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.
4) Refer to 11-2 and 11-3.
OBH648
19
11-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure details can be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.
First, release RESET button.
Hold down the other two buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed. Then release the buttons.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1
Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of OPERATION INDICATOR lamp. 2
No
(OFF)
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way.
Confi rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 11-2.2)
Judgment of indoor/outdoor abnormality
Yes
(Blinks)
Before blinking, does the upper lamp of OPERATION INDICA-
TOR lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
Yes
The indoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point with the indoor unit failure mode table. (Refer to indoor unit service manual.)
Make sure to check at least two consecutive blinking cycles. 2
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table. (Refer to 11-2.3)
Make sure to check at least two consecutive blinking cycles. 3
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the failure parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.
NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
2.5-second OFF
Blinking at 0.5second interval 2.5-second OFF
Blinking at 0.5second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
2.5-second OFF 3-second ON second interval
ON
OFF
No beep
Repeated cycle
Beeps
2.5-second OFF
Beeps
Repeated cycle
3-second ON
No beep
Repeated cycle
OBH648
20
Blinking at 0.5second interval
Beeps
Repeated cycle
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Check if outdoor unit is abnormal according to the following procedures.
Make sure that the remote controller is set to the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO
COOL or TOO WARM button to adjust the set temperature to 25°C. 1
1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the upper lamp of OPERATION INDICATOR lamp. 2
Yes
(Blinks )
No
(OFF)
The outdoor unit is abnormal.
Check the blinking pattern, and identify the abnormal point with the outdoor unit failure mode table (11-2.3.).
Make sure to check at least two consecutive blinking cycles. 2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
The outdoor unit is normal.
Release the failure mode recall function according to the left mentioned procedure.
Repair the failure parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (11-2.1.).
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.
NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2.Blinking pattern when outdoor unit is abnormal:
2.5-second OFF 3-second ON
ON
OFF
No beep
Repeated cycle
Blinking at 0.5second interval
Beeps
2.5-second OFF 3-second ON
No beep
Repeated cycle
Blinking at 0.5second interval
Beeps
Repeated cycle
OBH648
21
3. Outdoor unit failure mode table
The upper lamp of
OPERATION
INDICATOR lamp
(Indoor unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C. board)
1-time fl ash
2.5 seconds
OFF
2-time fl ash
2.5 seconds
OFF
3-time fl ash
2.5 seconds
OFF
4-time fl ash
2.5 seconds
OFF
5-time fl ash
2.5 seconds
OFF
6-time fl ash
2.5 seconds
OFF
7-time fl ash
2.5 seconds
OFF
9-time fl ash
2.5 seconds
OFF
10-time fl ash
2.5 seconds
OFF
11-time fl ash
2.5 seconds
OFF
14-time fl ash
2.5 seconds
OFF
Indoor/outdoor communication, receiving error
Indoor/outdoor communication, receiving error
Outdoor power system
Discharge temperature thermistor
Defrost thermistor
Fin temperature thermistor
P.C. board temperature thermistor
Compressor synchronous abnormality (Compressor start-up failure protection)
Discharge temperature
High pressure
Fin temperature/ P.C. board temperature
Nonvolatile memory data
Power module
Discharge temperature
DC voltage
Each phase current of compressor
Stop valve (Closed valve)
4-way valve/
Pipe temperature
—
—
—
—
1-time fl ash every
2.5 seconds
— —
Any signals from the inverter P.C. board cannot be received normally for
3 minutes.
Although the inverter P.C. board sends signal "0", signal "1" has been received
30 consecutive times.
Overcurrent protection cut-out operates 3 consecutive times within
1 minute after the compressor gets started.
Thermistor shorts or opens during compressor running.
•Refer to 11-5. How to check miswiring and serial signal error.
•Refer to 11-5. How to check miswiring and serial signal error.
•
•
Reconnect connectors.
•
Refer to 11-5. "How to check inverter/ compressor".
Check stop valve.
• Refer to 11-5.
"Check of outdoor thermistors".
Defective outdoor thermistors can be identifi ed by checking the blinking pattern of
LED.
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
—
—
7-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
Waveform of compressor current is distorted.
Temperature of discharge temperature thermistor exceeds 116°C, compressor stops.
Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.
• Check refrigerant circuit and refrigerant
• amount.
Refer to 11-5. "Check of LEV".
Temperature indoor coil thermistor exceeds 70°C in HEAT mode.
Temperature defrost thermistor exceeds 70°C in COOL mode.
• Check refrigerant circuit and refrigerant
• amount.
Check stop valve.
Temperature of fi n temperature thermistor on the inverter P.C. board exceeds 80 °C or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 78 °C.
Nonvolatile memory data cannot be read properly.
• compressor connector.
•
Refer to 11-5. "How to check inverter/
• compressor".
Check stop valve.
•
•
Reconnect compressor connector.
Refer to 11-5. "How to check inverter/ compressor".
•
•
Check around outdoor unit.
•
Check outdoor unit air passage.
Refer to 11-5. "Check of outdoor fan motor".
• Replace the inverter
P.C. board.
6-time fl ash
2.5 seconds OFF
—
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
16-time fl ash
2.5 seconds OFF
The interface short circuit occurs in the output of the power module (IC700).
The compressor winding shorts circuit.
Temperature of discharge temperature thermistor has been 50°C or less for
20 minutes.
DC voltage of inverter cannot be detected normally.
• Refer to 11-5. "How to check inverter/ compressor".
•
•
Refer to 11-5. "Check of LEV".
Check refrigerant circuit and refrigerant amount.
• Refer to 11-5. "How to check inverter/ compressor".
Each phase current of compressor cannot be detected normally.
• Check stop valve.
Closed valve is detected by compressor current.
The 4-way valve does not work properly.
The indoor coil thermistor detects an abnormal temperature.
•
•
Check 4-way valve.
Replace inverter P.C. board.
Indoor/outdoor mode recall function
Outdoor unit failure mode recall function
—
○
○
○
—
—
—
—
—
○
—
—
○
—
○
○
○
○
○
○
○
○
○
○
○
○
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.).
OBH648
22
11-3. TROUBLESHOOTING CHECK TABLE
Condition Remedy
1
Outdoor unit does not operate.
1-time fl ash every
2.5 seconds
'Outdoor unit stops and restarts 3 minutes later' is repeated.
16-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
Outdoor power system
Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.
•
•
Reconnect connector of compressor.
Refer to 11-5. "How to check inverter/compressor".
• Check stop valve.
• Refer to 11-5. "Check of outdoor thermistors".
2
3
4
5
6
7
8
9
10
11
12
13
14
16
17
18
19
20
21
Outdoor unit operates.
6-time fl ash
2.5 seconds OFF
11-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
13-time fl ash
2.5 seconds OFF
1-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
7-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, defrost thermistor, P.C. board temperature thermistor or outdoor heat exchanger temperature thermistor shorts or opens during compressor running.
Outdoor control system
Nonvolatile memory data cannot be read properly.
Serial signal
(The upper lamp of OPERATION INDICATOR lamp of the indoor unit lights up or fl ashes 7-time.)
The communication fails between the indoor and outdoor unit for 3 minutes.
Stop valve/
Closed valve
Outdoor unit
(Other abnormality)
4-way valve/
Pipe temperature
Overcurrent protection
Closed valve is detected by compressor current.
Outdoor unit is defective.
The 4-way valve does not work properly.
The indoor coil thermistor detects an abnormal temperature.
Large current fl ows into power module.
When overcurrent protection occurs within 10 seconds after compressor starts, compressor restarts after 15 seconds.
•
•
•
Replace inverter P.C. board.
Refer to 11-5. "How to check miswiring and serial signal error.
Check stop valve.
• Refer to 11-2.2. "Flow chart of the detailed outdoor unit failure mode recall function".
•
•
Refer to 11-5. "Check of R.V. coil".
Replace inverter P.C. board.
•
•
•
Reconnect connector of compressor.
Refer to 11-5. "How to check inverter/compressor".
Check stop valve.
Discharge temperature overheat protection
Fin temperature
/P.C. board temperature thermistor overheat protection
High pressure protection
Temperature of discharge temperature thermistor exceeds
116 °C, compressor stops. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-5. "Check of LEV".
Temperature of fi n temperature thermistor on the heat sink exceeds 80 °C or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 78 °C.
Indoor coil thermistor exceeds 70 °C in HEAT mode. Defrost thermistor exceeds 70 °C in COOL mode.
The waveform of compressor current is distorted.
•
•
•
Check around outdoor unit.
Check outdoor unit air passage.
Refer to 11-5. "Check of outdoor fan motor".
• Check refrigerant circuit and refrigerant amount.
• Check stop valve.
•
•
Reconnect connector of compressor.
Refer to 11-5. "How to check inverter/compressor".
Compressor synchronous abnormality
Each phase current of compressor
DC voltage
Frequency drop by current protection
Frequency drop by high pressure protection
Each phase current of compressor cannot be detected normally.
DC voltage of inverter cannot be detected normally.
When the input current exceeds 5.4 A (HJ25)/6.1 A (HJ35), compressor frequency lowers.
Temperature of indoor coil thermistor exceeds 55 °C in HEAT mode, compressor frequency lowers.
• Refer to 11-5. "How to check inverter/compressor".
• Refer to 11-5. "How to check inverter/compressor".
•
•
•
The unit is normal, but check the following.
Check if indoor fi lters are clogged.
Check if refrigerant is short.
Check if indoor/outdoor unit air circulation is short cycled.
Frequency drop by defrosting in COOL mode
Frequency drop by discharge temperature protection
Outside temperature thermistor protection
Low discharge temperature protection
PAM protection
PAM: Pulse Amplitude Modulation
Indoor coil thermistor reads 8 °C or less in COOL mode, compressor frequency lowers.
Temperature of discharge temperature thermistor exceeds
111 °C, compressor frequency lowers.
When the outside temperature thermistor shorts or opens, protective operation without that thermistor is performed.
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
The overcurrent fl ows into IC821 (Switching power transistor) or the bus-bar voltage reaches 320 V or more, PAM stops and restarts.
Inverter check mode The connector of compressor is disconnected, inverter check mode starts.
• Check refrigerant circuit and refrigerant amount.
•
•
Refer to 11-5. "Check of LEV".
Refer to 11-5. "Check of outdoor thermistors".
• Refer to 11-5. Check of outdoor thermistors.
•
•
Refer to 11-5. "Check of LEV".
Check refrigerant circuit and refrigerant amount.
This is not malfunction. PAM protection will be activated in the following cases:
1 Instantaneous power voltage drop. (Short time power failure)
2 When the power supply voltage is high.
• Check if the connector of the compressor is correctly connected.
Refer to 11-5. "How to check inverter/compressor".
NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 11-6.1.
2. LED is lighted during normal operation.
Inverter P.C. board
MUZ-HJ25/35
The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the fl ashing frequency is “2”.
0.5-second ON
0.5-second ON
LED
←
Flashing
ON
2.5-second OFF
2.5-second OFF
OFF
OBH648
23
11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-HJ25VA MUZ-HJ35VA
Part name Check method and criterion
Defrost thermistor
(RT61)
Measure the resistance with a tester.
Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.
Discharge temperature thermistor (RT62)
Fin temperature thermistor
(RT64)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.
Measure the resistance between the terminals with a tester.
(Part temperature -10 ~ 40°C)
Normal
Compressor (MC)
U-V
U-W
V-W
MUZ-HJ25VA
2.01 ~ 2.86 Ω
MUZ-HJ35VA
1.20 ~ 1.72 Ω
Outdoor fan motor (MF)
INNER FUSE
RA6V21-AB
152
+0
-5
°C CUT OFF
RA6V21-BB
126 ± 2: CUT OFF
Measure the resistance between the terminals with a tester.
(Part temperature -10 ~ 40°C)
Color of lead wire
WHT – BLK
BLK – RED
RA6V21-AB
305 ~ 374 Ω
247 ~ 304 Ω
Normal
RA6V21-BB, BD
222 ~ 272 Ω
245 ~ 300 Ω
R.V. coil (21S4)
Measure the resistance between the terminals with a tester.
(Part temperature -10˚C ~ 40°C)
Normal
1.19 ~ 1.78 kΩ
Expansion valve coil (LEV)
Measure the resistance using a tester.
(Part temperature: -10 ~ 40°C)
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Normal
37 ~ 54 Ω
WHT
RED
ORN
Figure
WHT
2
RED BLK
3
W
1
V
U
FUSE
BLK
RED
WHT
LEV
OBH648
24
11-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector (CN61) between compressor and the power module (IC700).
Check the voltage between terminals.
Are the voltages balanced?
Yes
Check the compressor.
No
See 11-5. “Check of open phase”.
Replace the inverter P.C. board.
See 11-5. “Check of compressor”.
B Check of open phase
● With the connector between the compressor and the power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-
TION : Refer to 8-3.)
<<Measurement point>>
At 3 points
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
Measure AC voltage between the lead wires at 3 points.
NOTE : 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to 11-6.1.)
OBH648
25
C Check of compressor
Refer to 11-5. “Check of compressor winding”.
Is the compressor normal?
Yes
Refer to 11-5. “Check of compressor operation time”.
Does the compressor operate continuously?
Yes
OK.
No
No
Replace the compressor.
Refer to 11-5. “Check of compressor start failure”.
D Check of compressor winding
● Disconnect the connector (CN61) between the compressor and power module, and measure the resistance between the compressor terminals.
<<Measurement point>>
At 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgement>>
Measure the resistance between the lead wires at 3 points.
Refer to 11-4.
0 [Ω] ················Abnormal [short]
Infinite [Ω] ·······Abnormal [open]
NOTE : Be sure to zero the ohmmeter before measurement.
E Check of compressor operation time
● Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current.
method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION: Refer to 8-3.)
<<Measurement>>
Measure the time from the start of compressor to the stop of compressor due to overcurrent.
<<Judgement>>
0 second
1 second
2 seconds
10 seconds
10 minutes
Compressor starts
Abnormal
(IC700 failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
OBH648
26
F Check of compressor start failure
Make sure that ~ is normal.
•Electrical circuit check
. Contact of the compressor connector (Including CN61)
. Output voltage of inverter P.C. board and balance of them (See 11-5. )
. Direct current voltage between DB61(+) and (-) on the inverter P.C. board
. Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or more after it starts?
No
Yes
After the compressor is heated with a drier, does the compressor start? 1
Yes
Compressor start failure. Activate pre-heat control.
(Refer to 10-2. "PRE-HEAT CONTROL SETTING")
No
Check the refrigerant circuit.
Check the stop valve.
Replace the compressor.
1
Heat the compressor with a drier for about 20 minutes.
Do not recover refrigerant gas while heating.
Heating part
G Check of outdoor thermistors
Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor.
Is the thermistor normal? (Refer to 11-6.1.)
Yes
No
Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board.
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more without showing thermistor abnormality?
Yes
No
OK.
(Cause is poor contact.)
Thermistor
Defrost
Discharge temperature
Fin temperature
Symbol
RT61
RT62
RT64
Replace the inverter P.C. board.
Connector, Pin No.
Between CN641 pin 1 and pin 2
Between CN641 pin 3 and pin 4
Between CN642 pin 1 and pin 2
Board
Inverter P.C. board
OBH648
27
H Check of R.V. coil
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.
In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V. coil.
Check if CN721 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector (CN61) between the compressor and the power module.
Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).
Is there 230 VAC between CN721 and
on the inverter P.C. board 3 minutes after the power supply is turned ON?
Yes
Replace the 4-way valve.
No
Replace the inverter
P.C. board.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector (CN61) between the compressor and the power module.
Turn ON the power supply and press
EMERGENCY OPERATION switch twice (HEAT mode).
Is there 230 VAC between CN721 and
on the inverter P.C. board 3 minutes after the power supply is turned ON?
No
Replace the 4-way valve.
Yes
Replace the inverter
P.C. board.
I Check of outdoor fan motor
Check the resistance of fan motor. (Refer to
11-4.)
Is the resistance of fan motor normal?
Yes
No
Disconnect the connector CN771 on the inverter P.C. board.
Disconnect the connector (CN61) between compressor and power transistor module.
Turn ON the power supply and press the
EMERGENCY OPERATION switch.
Does the upper lamp of
OPERATION
INDICATOR lamp on the indoor unit light up?
Replace the outdoor fan motor.
After 3 minutes, is there voltage 230 VAC between CN771 and
on the inverter P.C. board?
Yes
Replace the outdoor fan motor.
No
Replace the inverter
P.C. board.
OBH648
28
J Check of power supply
Disconnect the connector (CN61) between compressor and power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
DB61
250 - 370 VDC
Does the upper lamp of OPERATION
INDICATOR lamp on the indoor unit light up?
Yes
No
Is there voltage 250 - 370 VDC between DB61 (+) and DB61 (–) on the inverter P.C. board?
(Refer to 11-6.1.)
No
Yes
Check the electric parts in main circuit.
Rectify indoor/outdoor connecting wire.
Yes
Is there voltage 230 VAC between the indoor terminal block S1 and S2?
Dose LED on the inverter P.C. board light up or fl ash? (Refer to 11-6.1.)
If light up, OK.
Yes
If fl ash, refer to 11-3.
No
No
Inverter P.C. board
(Solder side)
Replace the indoor electronic control P.C. board.
Replace the inverter
P.C. board.
K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.
First, release RESET button.
Hold down the other two buttons for another 3
seconds. Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed.
Then release the buttons.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click, click·······"?
Do you feel the expansion valve vibrate on touching it ?
No
Yes
OK
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Is LEV coil properly fi xed to the expansion valve?
Yes
No
Does the resistance of LEV coil have the characteristics?
(Refer to 11-4.)
No
Yes
Replace the LEV coil.
Properly fi x the LEV coil to the expansion valve.
Measure each voltage between connector pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog tester.
Yes
Replace the expansion valve.
NOTE : After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn ON it again.
2. Press RESET button on the remote controller.
OBH648
29
No
Replace the inverter P.C. board.
L How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
No
Yes
1. Turn ON the power supply.
2. Press the emergency operation switch.
Check the power supply.
No
Initializing the determination of the power receiving system
The microprocessor may have mistaken the unit as a model receiving power from the outdoor unit. Follow the procedure below to start the determination of the power receiving system all over again.
1. Hold down the emergency operation switch for 30 seconds. (Do not release the switch even though a buzzer beeps once in about 5 seconds. Keep holding down the switch until a buzzer beeps again for
1 second after 30 seconds. Figure 1)
2. Turn off the power supply.
3. Wait for about 30 seconds.
4. Turn on the power supply.
5. Press the emergency operation switch.
6. The relay 52C will be turned on in 3 minutes.
Has the relay 52C been turned on 3 minuets later ?
[The relay will be turned on in 3 to 7 seconds by short circuiting the timer short mode point (Refer to 10-7.).]
Yes
Has the miswiring or the serial error been indicated?
No
Yes
Indication of miswiring
Indication of serial signal error
OPERATION
INDICATOR lamp
Continuous blinks
Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?
Yes
No
Correct them.
A
Figure 1
Buzzer
ON
0.5-second
OFF
Beeps Beeps
Emergency operation switch
ON
OFF
5-second
1-second
Beeps
B
Turn OFF the power supply. Make sure again that the indoor/outdoor connecting wire is correctly connected. With the indoor/outdoor connecting wire connected, short circuit between S2 and S3 on the outdoor terminal block. 1
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and
TOO COOL button on the remote controller at the same time, press RESET button.
First, release RESET button.
Hold down the other two buttons for another 3 seconds.
Make sure that the indicators on the LCD screen shown in the right fi gure are all displayed. Then release the buttons.
(Setting up the failure mode recall function)
ON
30-second
A
•
•
•
Turn OFF inverter-controlled lighting equipment.
Turn OFF the power supply and then turn ON again.
Press the emergency operation switch.
After the relay
52C is turned on
3 minutes later, is miswiring or the serial signal error indicated?
Yes
B
No
•
•
Reinstall either the unit or the light away from each other.
Attach a fi lter on remote control receiving section of the indoor unit.
OBH648
OFF
Aim the remote controller at the indoor unit, and press
OPERATE/STOP (ON/OFF) button. The relay 52C will be turned on, and the outdoor unit will be energized.
1 Make sure that the wiring is correct. If the procedure is performed without correcting miswiring, it may lead to damage to the P.C. board.
Is the rated supply voltage applied between the S1 and S2 on the outdoor terminal block? (Check of supply voltage)
Yes
No
Is there any problem in the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact with the terminal block?
No
Is there approximately 250 VDC
– 370 VDC between DB61(+) and
DB61 (–) on the indoor inverter
P.C. board? (Voltage check of the inverter P.C. board)
Yes
No
Replace the indoor inverter
P.C. board. 2
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and
0.8-second-ON quick blinking" for
3 minutes after the outdoor unit is energized?
(Check the blinking pattern within 3 minutes after LED is turned on. After 3 minutes, LED will blink 6 times whether the inverter P.C. board is normal or not.)
Yes
2 Be careful of 140
VDC – 280 VDC residual charge in the capacitor on the main inverter circuit.
No
Replace the indoor inverter
P.C. board. 2
Replace the indoor electronic control
P.C. board. 3
3 Be sure to release the failure-mode recall function after checking.
30
Yes
Replace the indoor/ outdoor connecting wire.
M Electromagnetic noise enters into TV sets or radios
Is the unit earthed?
Yes
No
Earth the unit.
Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m?
No
Yes
Is the distance between the TV sets or radios and the indoor unit within 1 m, or is the distance between the TV sets or radios and the outdoor unit within 3 m?
No
Yes
Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Yes
Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close?
No
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of specifi c conditions such as antennas or wiring).
Check the following before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of ;
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver
5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
OBH648
31
11-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-HJ25VA MUZ-HJ35VA
Back side of unit
DB61
250 V - 370 VDC
(+)
(-)
230 VAC
Smoothing capacitor (C61)
Fuse (F801)
T3.15AL250V
Output to drive outdoor fan motor (CN771)
R.V. coil
(CN721)
Fuse (F701)
T3.15AL250V
Output to drive compressor
(LDW,
LDV,
LDU)
230 VAC
LED
Front side of unit
LEV connector
(CN724)
Jumper wire for changing defrost setting (JS)
Jumper wire for pre-heat control setting (JK)
100
Defrost thermistor (RT61)
90
80
70
60
50
40
30
20
10
0
-20 -10 0 10 20 30 40
Temperature (°C)
OBH648
700
Discharge temperature thermistor (RT62)
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
32
200
Fin temperature thermistor (RT64)
180
160
140
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80
Temperature (°C)
12
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types (refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
Locking lever
Slide the sleeve.
Pull the terminal while pushing the locking lever.
Hold the sleeve, and pull out the terminal slowly.
Connector
12-1. MUZ-HJ25VA MUZ-HJ35VA
OPERATING PROCEDURE
1. Removing the cabinet and the panels
(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3) Disconnect the power supply and indoor/outdoor connecting wire.
(4) Remove the screws fixing the top panel.
(5) Remove the top panel.
(6) Remove the screws fixing the cabinet.
(7) Remove the cabinet.
(8) Remove the fixing screws of the terminal block support and the back panel. (Photo 4)
(9) Remove the screws fixing the back panel.
(10) Remove the back panel.
Photo 1
NOTE: Turn OFF power supply before disassembly.
PHOTOS
Screws of the top panel
Photo 2
Screws of the top panel
Direction to remove
Screws of the service panel
Photo 3
Screws of the cabinet
Screws of the back panel
Screw of the cabinet
Hooks
OBH648
33
OPERATING PROCEDURE
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and the panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN771 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the heat sink support and the separator.
(5) Remove the inverter assembly.
(6) Remove the screw of the earth wire and the screw of the terminal block support.
(7) Remove the screw of the terminal block and remove the terminal block.
(8) Remove the heat sink support from the P.C. board support.
(9) Unhook the catch of the inverter P.C. board and remove the inverter P.C. board from the P.C. board support.
PHOTOS
Photo 4
Screw of the heat sink and the separator
Screws of the terminal block support and the back panel
3. Removing the R.V. coil
(1) Remove the cabinet and the panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil.
Photo 5 (Inverter assembly)
Heat sink
Heat sink support
P.C. board support
Screw of the earth wire
Terminal block support
Inverter
P.C. board
Screw of the terminal block support
OBH648
34
OPERATING PROCEDURE
4. Removing the discharge temperature thermistor and the defrost thermistor
(1) Remove the cabinet and the panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(4) Pull out the defrost thermistor from its holder.
Photo 6
PHOTOS
Brazed part of the 4-way valve
5. Removing the outdoor fan motor
(1) Remove the cabinet and the panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN771 (Fan motor)
(3) Remove the fan motor lead wire from where it is fastened on the separator.
(4) Remove the propeller nut.
(5) Remove the propeller.
(6) Remove the screws fixing the fan motor.
(7) Remove the fan motor.
Brazed part of the
4-way valve
Photo 7
Defrost thermistor
Suction pipe brazed part
R.V. coil
Screws of the reactor
Photo 8
Discharge pipe brazed part
Discharge temperature thermistor
6. Removing the compressor and the 4-way valve
(1) Remove the cabinet and the panels. (Refer to 1.)
(2) Remove the inverter assembly. (Refer to 2.)
(3) Remove the screws of the reactor and remove the reactor.
(4) Remove the screws of the separator and remove the separator.
(5) Remove the terminal cover and the compressor lead wire.
(6) Recover gas from the refrigerant circuit.
NOTE:
Recover gas from the pipes until the pressure gauge shows 0 kg/cm 2 (0 MPa).
(7) Detach the brazed part of the suction and the discharge pipe connected with the compressor.
(8) Remove the nuts of compressor legs.
(9) Remove the compressor.
(10) Detach the brazed part of pipes connected with the
4-way valve.
Propeller
Screws of the outdoor fan motor
OBH648
35
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2012 MITSUBISHI ELECTRIC CORPORATION
Distributed in Dec. 2012. No. OBH648
Made in Japan
New publication, effective Dec. 2012
Specifications are subject to change without notice.
advertisement
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Related manuals
advertisement