Mitsubishi Electric MSZ-FH35VE - E1 Service manual

Revision A:
• MUZ-FH50VE-
E1
has been added.
Please void OBH624.
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
HFC
utilized
No. OBH624
REVISED EDITION-A
R410A
Models
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
- E1
- E1
- E1
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
CONTENTS
MUZ-FH25VE
MUZ-FH35VE
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 24
10. SERVICE FUNCTIONS···································· 25
11. TROUBLESHOOTING ····································· 26
12. DISASSEMBLY INSTRUCTIONS ···················· 47
PARTS CATALOG (OBB624)
Use the specified 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.
Revision A:
• MUZ-FH50VE-
E1
has been added.
OBH624A
2
1
TECHNICAL CHANGES
MUZ-FH25VE - E1
MUZ-FH35VE - E1
MUZ-FH50VE - E1
1. New model
2
PART NAMES AND FUNCTIONS
MUZ-FH25VE
MUZ-FH35VE
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
MUZ-FH50VE
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
ACCESSORIES
Model
Drain socket
OBH624A
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
1
3
3
SPECIFICATION
Outdoor model
MUZ-FH25VE
Power supply
Capacity
Rated frequency (Min.-Max.)
Cooling
Heating
Electrical data
Breaker Capacity
Power input 1 (Total)
Running current 1
(Total)
Power factor 1 (Total)
A
Cooling
Heating
Cooling
Heating
Cooling
Heating
Starting current 1 (Total)
Coefficient of performance
(COP) 1 (Total)
kW
W
A
%
A
Cooling
Heating
Model
Output
W
Cooling
Current 1
A
Heating
Refrigeration oil (Model)
L
Model
Fan motor
Cooling
Current 1
A
Heating
Dimensions W × H × D
mm
Weight
kg
Dehumidification
Cooling
L/h
High
Cooling
Low
Air flow 1
High
m3/h
Heating
Med.
Low
Cooling
Sound
dB(A)
level 1
Heating
High
Cooling
Low
Fan speed
High
rpm
Heating
Med.
Low
Fan speed regulator
Refrigerant filling capacity (R410A)
kg
Special remarks
Compressor
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.
OBH624A
MUZ-FH35VE
Single phase, 230 V, 50 Hz
2.5 (1.4 - 3.5)
3.5 (0.8 - 4.0)
3.2 (1.8 - 5.5)
4.0 (1.0 - 6.3)
10
485
820
580
800
2.6
3.9
2.9
3.8
81
91
86
91
2.9
3.9
5.15
4.27
5.52
5.00
SNB140FRUMT
950
2.04
3.32
2.34
3.22
0.35 (FV50S)
RC0J50-CI
0.28
0.30
0.28
0.30
800 × 550 × 285
37
0.2
0.8
1,806
1,038
2,016
1,710
1,326
46
49
49
50
810
490
900
770
610
3
1.15
Wet-bulb temperature
19°C
Wet-bulb temperature
6°C
4
MUZ-FH50VE
Power supply
Cooling
Capacity
kW
Rated frequency (Min. - Max.) Heating
Breaker Capacity
A
Cooling
Power input 1 (Total)
W
Heating
Cooling
Running current 1
A
(Total)
Heating
Cooling
%
Power factor 1 (Total)
Heating
Starting current 1 (Total)
A
Cooling
Coefficient of performance
(COP) 1 (Total)
Heating
Model
Output
W
Cooling
Compressor
Current 1
A
Heating
Refrigeration oil (Model)
L
Model
Fan motor
Cooling
Current 1
A
Heating
Dimensions W × H × D
mm
Weight
kg
Dehumidification
Cooling
L/h
High
Cooling
Med.
Low
Air flow 1
m3/h
High
Heating
Med.
Low
Cooling
Sound level 1
dB(A)
Heating
High
Cooling
Med.
Low
Fan speed
rpm
High
Heating
Med.
Low
Fan speed regulator
Refrigerant filling capacity (R410A)
kg
Single phase, 230 V, 50 Hz
5.0 (1.9 - 6.0)
6.0 (1.7 - 8.7)
16
1,380
1,480
6.1
6.5
98
98
6.5
3.62
4.05
SNB172FEKMT
1,200
4.98
5.37
0.40(FV50S)
RC0J60-BC
0.83
0.84
840 × 880 × 330
55
2.0
3,006
3,006
1,626
2,892
2,892
2,280
51
54
840
840
480
810
810
650
3
1.55
Special remarks
Electrical data
Outdoor model
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.
OBH624A
Wet-bulb temperature
19°C
Wet-bulb temperature
6°C
5
Specifications and rated conditions of main electric parts
Model
Item
Smoothing
capacitor
Diode module
Fuse
MUZ-FH25VE
(C61, C62)
600 μF/ 620 μF 420 V
(DB61)
15 A 600 V
(F61)
T20AL250V
(F701, F801, F901)
Power module
Circuit
protection
T3.15AL250V
(IC700)
15 A 600 V
(IC932)
8A600V
(LEV)
12 V DC
(L61)
23 mH
Expansion valve
coil
Reactor
Power factor
controller
(IC820)
20A 600V
(PTC64, PTC65)
Terminal block
33 Ω
(TB)
5P
(X63)
3 A 250 V
(X64)
20 A 250 V
(X69)
10A 230V
(21S4)
220 - 240 V AC
Relay
R.V.coil
MUZ-FH35VE
Specifications and rated conditions of main electric parts
Item
Smoothing
capacitor
Fuse
IGBT module
Model
MUZ-FH50VE
(CB1, CB2, CB3)
560 μF 450 V
(F601, F880, F901)
(IC932)
(IC700)
T3.15AL250 V
5 A 600 V
20 A 600 V
Expansion valve
(LEV)
coil
Reactor
(L)
Diode module
(IC820)
Circuit
(PTC64, PTC65)
protection
Terminal block
(TB1, TB2)
(X64)
(X65)
(X69)
Relay
(X601)
(X602)
R.V. coil
(21S4)
OBH624A
12 V DC
340 μH
20 A 600 V
33 Ω
3P
20 A 250 V
20 A 250 V
10 A 250 V
3 A 250 V
3 A 250 V
220 - 240 V AC
6
4
NOISE CRITERIA CURVES
MUZ-FH35VE
FUNCTION
SPL(dB(A))
FUNCTION
SPL(dB(A))
COOLING
46
COOLING
49
HEATING
49
HEATING
50
LINE
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
10
125
250
500
1000
2000
4000
8000
70
FUNCTION
SPL(dB(A))
COOLING
51
HEATING
54
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
63
125
250
500
1000
1m
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
OBH624A
4000
OUTDOOR UNIT
MICROPHONE
125
2000
8000
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
LINE
90
63
NC-20
NC-10
BAND CENTER FREQUENCIES, Hz
MUZ-FH50VE
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
80
10
63
BAND CENTER FREQUENCIES, Hz
10
LINE
90
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
MUZ-FH25VE
7
5
OUTLINES AND DIMENSIONS
MUZ-FH25VE
MUZ-FH35VE
100 mm or more
400
Air in
Drain hole ø42
100
m
100
mm
or m
ore
Bolt pitch for
installation
304~325
Air in
350
mm
or m
ore
200 mm or more
2 holes 10 X 21
17.5
40
re
r mo
mo
44
285
344.5
Unit: mm
REQUIRED SPACE
Service panel
Air out
23
22.3
69
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø9.52
99.5
10
164.5
280
35
550
150
43
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Handle
170.5
302.5
Service port
500 Bolt pitch for installation
800
MUZ-FH50VE
REQUIRED SPACE
500 mm or more
417.5
Drain hole
40
Air in
42
100 mm or more
mm
or m
ore
360
50
330
100
Air out
2-holes 10 21
175
350
500
840
500 mm or more
81
mm
or m
ore
109
Service panel
880
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) Ø 6.35
164.5
99.5
44
452
35
OBH624A
195
8
Gas refrigerant pipe joint
Refrigerant pipe
(flared) Ø 12.7
6
WIRING DIAGRAM
MUZ-FH25VE
MUZ-FH35VE
OBH624A
9
MUZ-FH50VE
OBH624A
10
7
REFRIGERANT SYSTEM DIAGRAM
MUZ-FH25VE
MUZ-FH35VE
Unit: mm
Refrigerant pipe ø9.52
(with heat insulator)
4-way valve
Muffler
Outdoor heat
exchanger
temperature
thermistor
RT68
Stop valve
Discharge
temperature
thermistor
RT62
Flared connection
Outdoor
heat
exchanger
Muffler
Ambient
temperature
thermistor
RT65
Compressor
Defrost
thermistor
RT61
Capillary tube
ø3.0×ø2.0×210
Flared connection
Capillary tube
ø4.0×ø2.4×240
Refrigerant pipe ø6.35
(with heat insulator)
Strainer
#100
LEV
R.V. coil
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant flow in cooling
Refrigerant flow in heating
MUZ-FH50VE
Muffler
4-way valve #100
Refrigerant pipe ø12.7
(with heat insulator)
Stop valve
Flared connection
Outdoor
heat
exchanger
Discharge
temperature
thermistor
RT62
Defrost
thermistor
RT61
Ambient
temperature
thermistor
RT65
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
Strainer
#100
Stop valve
LEV
Muffler
Capillary tube
ø4.0×ø2.4×100
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø6.35
(with heat insulator)
OBH624A
Strainer
#100
11
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping: m
Max. Length A
Max. Height difference B
20
12
30
15
Model
MUZ-FH25/35
MUZ-FH50
Piping size O.D: mm
Gas
Liquid
9.52
6.35
12.7
6.35
Indoor
unit
Max. Height
difference
B
Max. Length
A
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A: g)
Model
MUZ-FH25/35
Outdoor unit
precharged
1,150
7m
0
8m
30
9m
60
Refrigerant piping length (one way)
10 m
11 m
12 m
13 m
90
120
150
180
14 m
210
Refrigerant piping length (one way)
15 m
20 m
160
260
25 m
360
15 m
240
20 m
390
Calculation: X g = 30 g/m × (Refrigerant piping length (m) - 7)
Model
MUZ-FH50
Outdoor unit
precharged
1,550
7m
0
10 m
60
Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7)
OBH624A
12
30 m
460
8
PERFORMANCE CURVES
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
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:
°C [WB]
(2) Indoor outlet air wet-bulb temperature:
°C [WB]
Cooling
(3) Outdoor intake air dry-bulb temperature:
°C [DB]
(4) Total input:
W
(5) Indoor intake air dry-bulb temperature:
°C [DB]
(6) Outdoor intake air wet-bulb temperature:
°C [WB]
Heating
(7) Total input:
W
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.
}
}
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.
OUTDOOR UNIT
INDOOR UNIT
Wet and dry bulb
thermometers
FRONT VIEW
Wet and dry bulb
thermometers
BACK VIEW
8-1. CAPACITY AND INPUT CURVES
8.7
12.5
5.5
8.0
11.4
5.0
7.3
10.3
4.6
6.6
9.3
4.1
5.9
8.3
3.7
5.3
7.3
OBH624A
1.5
Capacity correction factors
5.9
MUZ-FH50VE
13.6
MUZ-FH35VE
9.5
MUZ-FH25VE
Indoor air Wet-bulb temperature
difference (°C)
Cooling capacity (at Rated frequency)
6.4
Indoor intake air Wet-bulb
temperature( )
1.4
1.3
1.2
26
1.1
24
1.0
22
20
18
0.9
-10
-5
0
5
10
15
20
25
30
Outdoor intake air Dry-bulb temperature(°C)
13
35
40
45
7.3
10.3
4.6
6.6
9.3
4.1
5.9
8.3
3.7
5.3
7.3
3.2
4.6
6.4
Input correction factors
5.0
1.3
1.2
22
20
18
24
26
1.1
1.0
0.9
Indoor intake air Wet-bulb
temperature( )
0.8
-10
MUZ-FH50VE
11.4
MUZ-FH35VE
8.0
MUZ-FH25VE
Indoor air Wet-bulb temperature
difference (°C)
Total input (Cooling : at Rated frequency)
5.5
-5
0
5
10
15
20
25
30
35
40
45
Outdoor intake air Dry-bulb temperature (°C)
26.9
1.3
14.6
18.3
24.8
1.2
13.4
16.8
22.7
12.2
15.2
20.7
18.6
12.2
16.5
8.5
10.7
14.5
7.3
9.1
12.4
6.1
7.6
10.3
4.9
6.1
8.3
1.0
tem
)
15
20
26
In
0.7
0.6
0.5
-15
1.3
14.6
18.3
24.8
1.2
13.4
16.8
22.7
12.2
15.2
20.7
18.6
12.2
16.5
8.5
10.7
14.5
7.3
9.1
12.4
6.1
7.6
10.3
4.9
6.1
8.3
MUZ-FH50VE
13.7
9.8
Input correction factor
26.9
11.0
-10
-5
0
5
10
Outdoor intake air Wet-bulb temperature (°C)
15
Total input (Heating : at Rated frequency)
19.8
MUZ-FH35VE
e
tak
r in
o
do
0.8
D
air
lb
bu
ry-
0.9
15.9
MUZ-FH25VE
Indoor air Dry-bulb temperature
difference (°C)
ur
rat
pe
1.1
e(
0.4
MUZ-FH50VE
13.7
9.8
MUZ-FH35VE
11.0
Capacity correction factor
19.8
MUZ-FH25VE
Indoor air Dry-bulb temperature
difference (°C)
Heating capacity (at Rated frequency)
15.9
1.0
0.9
re (
ratu
1.1
ake
r int
ulb
ry-b
air D
pe
tem
)
26
20
15
o
Indo
0.8
0.7
0.6
0.5
0.4
-15
-10
-5
0
5
10
Outdoor intake air Wet-bulb temperature (°C)
15
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
OBH624A
14
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR
0.5
0
2
1
0
50
100
The operational frequency
of compressor (Hz)
2.0
1.5
1.0
0.5
50
100
The operational frequency
of compressor (Hz)
Correction of Heating input
Correction of Heating capacity
Input correction factors
1.0
Correction of Cooling input
3
Capacity correction factors
1.5
Input correction factors
Capacity correction factors
MUZ-FH25VE
Correction of Cooling capacity
0
150
50
100
The operational frequency
of compressor (Hz)
3
2
1
0
150
50
100
The operational frequency
of compressor (Hz)
MUZ-FH35VE
Capacity correction factors
Correction of Cooling input
1.5
Input correction factors
Capacity correction factors
1.5
1.0
1.0
0.5
0.5
0
50
100
The operational frequency
of compressor (Hz)
0
Correction of Heating input
Correction of Heating capacity
2.0
3
Input correction factors
Correction of Cooling capacity
1.5
1.0
0.5
0
50
100
The operational frequency
of compressor (Hz)
150
50
100
The operational frequency
of compressor (Hz)
2
1
0
150
50
100
The operational frequency
of compressor (Hz)
MUZ-FH50VE
1.0
0.5
0
50
100
The operational frequency
of compressor (Hz)
Correction of Cooling input
2.0
1.5
1.0
0.5
0
50
100
The operational frequency
of compressor (Hz)
Correction of Heating input
Correction of Heating capacity
1.5
1.0
0.5
0
2.5
Capacity correction factors
1.5
2.0
Input correction factors
Capacity correction factors
2.0
Capacity correction factors
Correction of Cooling capacity
50
100
150
The operational frequency
of compressor (Hz)
2.0
1.5
1.0
0.5
0
50
100
150
The operational frequency
of compressor (Hz)
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.
OBH624A
15
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-FH25VE
(kgf/cm2 [Gauge])(MPa [Gauge])
0.9
9
8
0.8
6
2
(kgf/cm [Gauge])(MPa [Gauge])
0.8
8
0.7
0.7
0.6
5
0.5
4
0.4
15
0.6
5
4
0.5
3
0.4
15
20
25
30
35
50
60
70
Ambient temperature(°C)
Ambient humidity(%)
Relative humidity (%)
50
60
70
MUZ-FH50VE
MUZ-FH35VE
(kgf/cm2 [Gauge])(MPa [Gauge])
0.8
7
6
7
Dry-bulb temperature (°C)
20
25
30
20
25
30
35
50
60
70
Ambient temperature(°C)
Ambient humidity(%)
7
0.7
6
0.6
5
0.5
4
0.4
3
0.3
15
20
25
30
35
50
60
70
Ambient temperature(°C)
Ambient humidity(%)
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/cm2 [Gauge])
Outdoor unit current
MUZ-FH25VE
MUZ-FH35VE
2.0
4.0
3.5
3.0
2.5
15
20
25
30
35
50
60
70
Ambient temperature (°C)
Ambient humidity(%)
8
Outdoor current (A)
Outdoor current (A)
Outdoor current (A)
2.5
1.5
15
MUZ-FH50VE
4.5
3.0
7
6
5
4
3
15
20
25
30
35
50
60
70
Ambient temperature (°C)
Ambient humidity(%)
20
25
30
35
50
60
70
Ambient temperature (°C)
Ambient humidity(%)
HEAT operation
Condition:
Dry bulb temperature (°C)
Wet bulb temperature (°C)
Indoor
20.0
14.5
2
1
Outdoor
7
15
6
12
20.0
14.5
Operation: Test run operation (Refer to 8-3.)
Outdoor unit current
MUZ-FH25VE
MUZ-FH35VE
8
5.0
4.5
15
20
25
5
10
Ambient temperature (°C)
OBH624A
Outdoor current (A)
Outdoor current (A)
Outdoor current (A)
5.5
4.0
0
MUZ-FH50VE
6.0
6.0
5.5
5.0
4.5
4.0
0
15
20
25
5
10
Ambient temperature (°C)
16
7
6
5
4
3
0
5
10
15
20
25
Ambient temperature (°C)
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH25VE
CAPACITY: 2.5 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.95
INPUT: 485 W
OUTDOOR DB (°C)
21
25
27
30
SHF
INPUT
21
18
2.94
2.26
0.77
388
2.81
2.17
0.77
407
2.70
2.08
0.77
427
2.60
2.00
0.77
446
21
20
3.06
1.99
0.65
407
2.94
1.91
0.65
432
2.85
1.85
0.65
441
2.75
1.79
0.65
461
22
18
2.94
2.38
0.81
388
2.81
2.28
0.81
407
2.70
2.19
0.81
427
2.60
2.11
0.81
446
22
20
3.06
2.11
0.69
407
2.94
2.03
0.69
432
2.85
1.97
0.69
441
2.75
1.90
0.69
461
22
22
3.19
1.82
0.57
422
3.08
1.75
0.57
449
3.00
1.71
0.57
461
2.88
1.64
0.57
480
23
18
2.94
2.50
0.85
388
2.81
2.39
0.85
407
2.70
2.30
0.85
427
2.60
2.21
0.85
446
23
20
3.06
2.24
0.73
407
2.94
2.14
0.73
432
2.85
2.08
0.73
441
2.75
2.01
0.73
461
23
22
3.19
1.94
0.61
422
3.08
1.88
0.61
449
3.00
1.83
0.61
461
2.88
1.75
0.61
480
24
18
2.94
2.61
0.89
388
2.81
2.50
0.89
407
2.70
2.40
0.89
427
2.60
2.31
0.89
446
24
20
3.06
2.36
0.77
407
2.94
2.26
0.77
432
2.85
2.19
0.77
441
2.75
2.12
0.77
461
24
22
3.19
2.07
0.65
422
3.08
2.00
0.65
449
3.00
1.95
0.65
461
2.88
1.87
0.65
480
24
24
3.35
1.78
0.53
441
3.23
1.71
0.53
466
3.15
1.67
0.53
480
3.05
1.62
0.53
504
25
18
2.94
2.73
0.93
388
2.81
2.62
0.93
407
2.70
2.51
0.93
427
2.60
2.42
0.93
446
25
20
3.06
2.48
0.81
407
2.94
2.38
0.81
432
2.85
2.31
0.81
441
2.75
2.23
0.81
461
25
22
3.19
2.20
0.69
422
3.08
2.12
0.69
449
3.00
2.07
0.69
461
2.88
1.98
0.69
480
25
24
3.35
1.91
0.57
441
3.23
1.84
0.57
466
3.15
1.80
0.57
480
3.05
1.74
0.57
504
26
18
2.94
2.85
0.97
388
2.81
2.73
0.97
407
2.70
2.62
0.97
427
2.60
2.52
0.97
446
26
20
3.06
2.60
0.85
407
2.94
2.50
0.85
432
2.85
2.42
0.85
441
2.75
2.34
0.85
461
26
22
3.19
2.33
0.73
422
3.08
2.24
0.73
449
3.00
2.19
0.73
461
2.88
2.10
0.73
480
26
24
3.35
2.04
0.61
441
3.23
1.97
0.61
466
3.15
1.92
0.61
480
3.05
1.86
0.61
504
26
26
3.45
1.69
0.49
466
3.35
1.64
0.49
490
3.30
1.62
0.49
504
3.20
1.57
0.49
519
27
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
27
20
3.06
2.73
0.89
407
2.94
2.61
0.89
432
2.85
2.54
0.89
441
2.75
2.45
0.89
461
27
22
3.19
2.45
0.77
422
3.08
2.37
0.77
449
3.00
2.31
0.77
461
2.88
2.21
0.77
480
27
24
3.35
2.18
0.65
441
3.23
2.10
0.65
466
3.15
2.05
0.65
480
3.05
1.98
0.65
504
27
26
3.45
1.83
0.53
466
3.35
1.78
0.53
490
3.30
1.75
0.53
504
3.20
1.70
0.53
519
28
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
28
20
3.06
2.85
0.93
407
2.94
2.73
0.93
432
2.85
2.65
0.93
441
2.75
2.56
0.93
461
28
22
3.19
2.58
0.81
422
3.08
2.49
0.81
449
3.00
2.43
0.81
461
2.88
2.33
0.81
480
28
24
3.35
2.31
0.69
441
3.23
2.23
0.69
466
3.15
2.17
0.69
480
3.05
2.10
0.69
504
28
26
3.45
1.97
0.57
466
3.35
1.91
0.57
490
3.30
1.88
0.57
504
3.20
1.82
0.57
519
29
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
29
20
3.06
2.97
0.97
407
2.94
2.85
0.97
432
2.85
2.76
0.97
441
2.75
2.67
0.97
461
29
22
3.19
2.71
0.85
422
3.08
2.61
0.85
449
3.00
2.55
0.85
461
2.88
2.44
0.85
480
29
24
3.35
2.45
0.73
441
3.23
2.35
0.73
466
3.15
2.30
0.73
480
3.05
2.23
0.73
504
29
26
3.45
2.10
0.61
466
3.35
2.04
0.61
490
3.30
2.01
0.61
504
3.20
1.95
0.61
519
30
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
30
20
3.06
3.06
1.00
407
2.94
2.94
1.00
432
2.85
2.85
1.00
441
2.75
2.75
1.00
461
30
22
3.19
2.84
0.89
422
3.08
2.74
0.89
449
3.00
2.67
0.89
461
2.88
2.56
0.89
480
30
24
3.35
2.58
0.77
441
3.23
2.48
0.77
466
3.15
2.43
0.77
480
3.05
2.35
0.77
504
30
26
3.45
2.24
0.65
466
3.35
2.18
0.65
490
3.30
2.15
0.65
504
3.20
2.08
0.65
519
31
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
31
20
3.06
3.06
1.00
407
2.94
2.94
1.00
432
2.85
2.85
1.00
441
2.75
2.75
1.00
461
31
22
3.19
2.96
0.93
422
3.08
2.86
0.93
449
3.00
2.79
0.93
461
2.88
2.67
0.93
480
31
24
3.35
2.71
0.81
441
3.23
2.61
0.81
466
3.15
2.55
0.81
480
3.05
2.47
0.81
504
31
26
3.45
2.38
0.69
466
3.35
2.31
0.69
490
3.30
2.28
0.69
504
3.20
2.21
0.69
519
32
18
2.94
2.94
1.00
388
2.81
2.81
1.00
407
2.70
2.70
1.00
427
2.60
2.60
1.00
446
32
20
3.06
3.06
1.00
407
2.94
2.94
1.00
432
2.85
2.85
1.00
441
2.75
2.75
1.00
461
32
22
3.19
3.09
0.97
422
3.08
2.98
0.97
449
3.00
2.91
0.97
461
2.88
2.79
0.97
480
32
24
3.35
2.85
0.85
441
3.23
2.74
0.85
466
3.15
2.68
0.85
480
3.05
2.59
0.85
504
32
26
3.45
2.52
0.73
466
3.35
2.45
0.73
490
3.30
2.41
0.73
504
3.20
2.34
0.73
519
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
17
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH25VE
CAPACITY: 2.5 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.95
INPUT: 485 W
OUTDOOR DB (°C)
35
40
46
SHF
INPUT
21
18
2.45
1.89
0.77
475
2.25
1.73
0.77
504
2.08
1.60
0.77
524
21
20
2.58
1.67
0.65
495
2.40
1.56
0.65
519
2.23
1.45
0.65
548
22
18
2.45
1.98
0.81
475
2.25
1.82
0.81
504
2.08
1.68
0.81
524
22
20
2.58
1.78
0.69
495
2.40
1.66
0.69
519
2.23
1.54
0.69
548
22
22
2.73
1.55
0.57
514
2.55
1.45
0.57
543
2.38
1.35
0.57
563
23
18
2.45
2.08
0.85
475
2.25
1.91
0.85
504
2.08
1.76
0.85
524
23
20
2.58
1.88
0.73
495
2.40
1.75
0.73
519
2.23
1.62
0.73
548
23
22
2.73
1.66
0.61
514
2.55
1.56
0.61
543
2.38
1.45
0.61
563
24
18
2.45
2.18
0.89
475
2.25
2.00
0.89
504
2.08
1.85
0.89
524
24
20
2.58
1.98
0.77
495
2.40
1.85
0.77
519
2.23
1.71
0.77
548
24
22
2.73
1.77
0.65
514
2.55
1.66
0.65
543
2.38
1.54
0.65
563
24
24
2.88
1.52
0.53
534
2.70
1.43
0.53
558
2.55
1.35
0.53
582
25
18
2.45
2.28
0.93
475
2.25
2.09
0.93
504
2.08
1.93
0.93
524
25
20
2.58
2.09
0.81
495
2.40
1.94
0.81
519
2.23
1.80
0.81
548
25
22
2.73
1.88
0.69
514
2.55
1.76
0.69
543
2.38
1.64
0.69
563
25
24
2.88
1.64
0.57
534
2.70
1.54
0.57
558
2.55
1.45
0.57
582
26
18
2.45
2.38
0.97
475
2.25
2.18
0.97
504
2.08
2.01
0.97
524
26
20
2.58
2.19
0.85
495
2.40
2.04
0.85
519
2.23
1.89
0.85
548
26
22
2.73
1.99
0.73
514
2.55
1.86
0.73
543
2.38
1.73
0.73
563
26
24
2.88
1.75
0.61
534
2.70
1.65
0.61
558
2.55
1.56
0.61
582
26
26
3.03
1.48
0.49
553
2.85
1.40
0.49
577
2.68
1.31
0.49
601
27
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
27
20
2.58
2.29
0.89
495
2.40
2.14
0.89
519
2.23
1.98
0.89
548
27
22
2.73
2.10
0.77
514
2.55
1.96
0.77
543
2.38
1.83
0.77
563
27
24
2.88
1.87
0.65
534
2.70
1.76
0.65
558
2.55
1.66
0.65
582
27
26
3.03
1.60
0.53
553
2.85
1.51
0.53
577
2.68
1.42
0.53
601
28
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
28
20
2.58
2.39
0.93
495
2.40
2.23
0.93
519
2.23
2.07
0.93
548
28
22
2.73
2.21
0.81
514
2.55
2.07
0.81
543
2.38
1.92
0.81
563
28
24
2.88
1.98
0.69
534
2.70
1.86
0.69
558
2.55
1.76
0.69
582
28
26
3.03
1.72
0.57
553
2.85
1.62
0.57
577
2.68
1.52
0.57
601
29
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
29
20
2.58
2.50
0.97
495
2.40
2.33
0.97
519
2.23
2.16
0.97
548
29
22
2.73
2.32
0.85
514
2.55
2.17
0.85
543
2.38
2.02
0.85
563
29
24
2.88
2.10
0.73
534
2.70
1.97
0.73
558
2.55
1.86
0.73
582
29
26
3.03
1.85
0.61
553
2.85
1.74
0.61
577
2.68
1.63
0.61
601
30
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
30
20
2.58
2.58
1.00
495
2.40
2.40
1.00
519
2.23
2.23
1.00
548
30
22
2.73
2.43
0.89
514
2.55
2.27
0.89
543
2.38
2.11
0.89
563
30
24
2.88
2.21
0.77
534
2.70
2.08
0.77
558
2.55
1.96
0.77
582
30
26
3.03
1.97
0.65
553
2.85
1.85
0.65
577
2.68
1.74
0.65
601
31
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
31
20
2.58
2.58
1.00
495
2.40
2.40
1.00
519
2.23
2.23
1.00
548
31
22
2.73
2.53
0.93
514
2.55
2.37
0.93
543
2.38
2.21
0.93
563
31
24
2.88
2.33
0.81
534
2.70
2.19
0.81
558
2.55
2.07
0.81
582
31
26
3.03
2.09
0.69
553
2.85
1.97
0.69
577
2.68
1.85
0.69
601
32
18
2.45
2.45
1.00
475
2.25
2.25
1.00
504
2.08
2.08
1.00
524
32
20
2.58
2.58
1.00
495
2.40
2.40
1.00
519
2.23
2.23
1.00
548
32
22
2.73
2.64
0.97
514
2.55
2.47
0.97
543
2.38
2.30
0.97
563
32
24
2.88
2.44
0.85
534
2.70
2.30
0.85
558
2.55
2.17
0.85
582
32
26
3.03
2.21
0.73
553
2.85
2.08
0.73
577
2.68
1.95
0.73
601
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
18
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH35VE
CAPACITY: 3.5 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.84
INPUT: 820 W
OUTDOOR DB (°C)
21
25
27
30
SHF
INPUT
21
18
4.11
2.71
0.66
656
3.94
2.60
0.66
689
3.78
2.49
0.66
722
3.64
2.40
0.66
754
21
20
4.29
2.32
0.54
689
4.11
2.22
0.54
730
3.99
2.15
0.54
746
3.85
2.08
0.54
779
22
18
4.11
2.88
0.70
656
3.94
2.76
0.70
689
3.78
2.65
0.70
722
3.64
2.55
0.70
754
22
20
4.29
2.49
0.58
689
4.11
2.39
0.58
730
3.99
2.31
0.58
746
3.85
2.23
0.58
779
22
22
4.46
2.05
0.46
713
4.31
1.98
0.46
759
4.20
1.93
0.46
779
4.03
1.85
0.46
812
23
18
4.11
3.04
0.74
656
3.94
2.91
0.74
689
3.78
2.80
0.74
722
3.64
2.69
0.74
754
23
20
4.29
2.66
0.62
689
4.11
2.55
0.62
730
3.99
2.47
0.62
746
3.85
2.39
0.62
779
23
22
4.46
2.23
0.50
713
4.31
2.15
0.50
759
4.20
2.10
0.50
779
4.03
2.01
0.50
812
24
18
4.11
3.21
0.78
656
3.94
3.07
0.78
689
3.78
2.95
0.78
722
3.64
2.84
0.78
754
24
20
4.29
2.83
0.66
689
4.11
2.71
0.66
730
3.99
2.63
0.66
746
3.85
2.54
0.66
779
24
22
4.46
2.41
0.54
713
4.31
2.32
0.54
759
4.20
2.27
0.54
779
4.03
2.17
0.54
812
24
24
4.69
1.97
0.42
746
4.52
1.90
0.42
787
4.41
1.85
0.42
812
4.27
1.79
0.42
853
25
18
4.11
3.37
0.82
656
3.94
3.23
0.82
689
3.78
3.10
0.82
722
3.64
2.98
0.82
754
25
20
4.29
3.00
0.70
689
4.11
2.88
0.70
730
3.99
2.79
0.70
746
3.85
2.70
0.70
779
25
22
4.46
2.59
0.58
713
4.31
2.50
0.58
759
4.20
2.44
0.58
779
4.03
2.33
0.58
812
25
24
4.69
2.16
0.46
746
4.52
2.08
0.46
787
4.41
2.03
0.46
812
4.27
1.96
0.46
853
26
18
4.11
3.54
0.86
656
3.94
3.39
0.86
689
3.78
3.25
0.86
722
3.64
3.13
0.86
754
26
20
4.29
3.17
0.74
689
4.11
3.04
0.74
730
3.99
2.95
0.74
746
3.85
2.85
0.74
779
26
22
4.46
2.77
0.62
713
4.31
2.67
0.62
759
4.20
2.60
0.62
779
4.03
2.50
0.62
812
26
24
4.69
2.35
0.50
746
4.52
2.26
0.50
787
4.41
2.21
0.50
812
4.27
2.14
0.50
853
26
26
4.83
1.84
0.38
787
4.69
1.78
0.38
828
4.62
1.76
0.38
853
4.48
1.70
0.38
877
27
18
4.11
3.70
0.90
656
3.94
3.54
0.90
689
3.78
3.40
0.90
722
3.64
3.28
0.90
754
27
20
4.29
3.34
0.78
689
4.11
3.21
0.78
730
3.99
3.11
0.78
746
3.85
3.00
0.78
779
27
22
4.46
2.95
0.66
713
4.31
2.84
0.66
759
4.20
2.77
0.66
779
4.03
2.66
0.66
812
27
24
4.69
2.53
0.54
746
4.52
2.44
0.54
787
4.41
2.38
0.54
812
4.27
2.31
0.54
853
27
26
4.83
2.03
0.42
787
4.69
1.97
0.42
828
4.62
1.94
0.42
853
4.48
1.88
0.42
877
28
18
4.11
3.87
0.94
656
3.94
3.70
0.94
689
3.78
3.55
0.94
722
3.64
3.42
0.94
754
28
20
4.29
3.52
0.82
689
4.11
3.37
0.82
730
3.99
3.27
0.82
746
3.85
3.16
0.82
779
28
22
4.46
3.12
0.70
713
4.31
3.01
0.70
759
4.20
2.94
0.70
779
4.03
2.82
0.70
812
28
24
4.69
2.72
0.58
746
4.52
2.62
0.58
787
4.41
2.56
0.58
812
4.27
2.48
0.58
853
28
26
4.83
2.22
0.46
787
4.69
2.16
0.46
828
4.62
2.13
0.46
853
4.48
2.06
0.46
877
29
18
4.11
4.03
0.98
656
3.94
3.86
0.98
689
3.78
3.70
0.98
722
3.64
3.57
0.98
754
29
20
4.29
3.69
0.86
689
4.11
3.54
0.86
730
3.99
3.43
0.86
746
3.85
3.31
0.86
779
29
22
4.46
3.30
0.74
713
4.31
3.19
0.74
759
4.20
3.11
0.74
779
4.03
2.98
0.74
812
29
24
4.69
2.91
0.62
746
4.52
2.80
0.62
787
4.41
2.73
0.62
812
4.27
2.65
0.62
853
29
26
4.83
2.42
0.50
787
4.69
2.35
0.50
828
4.62
2.31
0.50
853
4.48
2.24
0.50
877
30
18
4.11
4.11
1.00
656
3.94
3.94
1.00
689
3.78
3.78
1.00
722
3.64
3.64
1.00
754
30
20
4.29
3.86
0.90
689
4.11
3.70
0.90
730
3.99
3.59
0.90
746
3.85
3.47
0.90
779
30
22
4.46
3.48
0.78
713
4.31
3.36
0.78
759
4.20
3.28
0.78
779
4.03
3.14
0.78
812
30
24
4.69
3.10
0.66
746
4.52
2.98
0.66
787
4.41
2.91
0.66
812
4.27
2.82
0.66
853
30
26
4.83
2.61
0.54
787
4.69
2.53
0.54
828
4.62
2.49
0.54
853
4.48
2.42
0.54
877
31
18
4.11
4.11
1.00
656
3.94
3.94
1.00
689
3.78
3.78
1.00
722
3.64
3.64
1.00
754
31
20
4.29
4.03
0.94
689
4.11
3.87
0.94
730
3.99
3.75
0.94
746
3.85
3.62
0.94
779
31
22
4.46
3.66
0.82
713
4.31
3.53
0.82
759
4.20
3.44
0.82
779
4.03
3.30
0.82
812
31
24
4.69
3.28
0.70
746
4.52
3.16
0.70
787
4.41
3.09
0.70
812
4.27
2.99
0.70
853
31
26
4.83
2.80
0.58
787
4.69
2.72
0.58
828
4.62
2.68
0.58
853
4.48
2.60
0.58
877
32
18
4.11
4.11
1.00
656
3.94
3.94
1.00
689
3.78
3.78
1.00
722
3.64
3.64
1.00
754
32
20
4.29
4.20
0.98
689
4.11
4.03
0.98
730
3.99
3.91
0.98
746
3.85
3.77
0.98
779
32
22
4.46
3.84
0.86
713
4.31
3.70
0.86
759
4.20
3.61
0.86
779
4.03
3.46
0.86
812
32
24
4.69
3.47
0.74
746
4.52
3.34
0.74
787
4.41
3.26
0.74
812
4.27
3.16
0.74
853
32
26
4.83
2.99
0.62
787
4.69
2.91
0.62
828
4.62
2.86
0.62
853
4.48
2.78
0.62
877
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
19
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH35VE
CAPACITY: 3.5 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.84
INPUT: 820 W
OUTDOOR DB (°C)
35
40
46
SHF
INPUT
21
18
3.43
2.26
0.66
804
3.15
2.08
0.66
853
2.91
1.92
0.66
886
21
20
3.61
1.95
0.54
836
3.36
1.81
0.54
877
3.12
1.68
0.54
927
22
18
3.43
2.40
0.70
804
3.15
2.21
0.70
853
2.91
2.03
0.70
886
22
20
3.61
2.09
0.58
836
3.36
1.95
0.58
877
3.12
1.81
0.58
927
22
22
3.82
1.75
0.46
869
3.57
1.64
0.46
918
3.33
1.53
0.46
951
23
18
3.43
2.54
0.74
804
3.15
2.33
0.74
853
2.91
2.15
0.74
886
23
20
3.61
2.24
0.62
836
3.36
2.08
0.62
877
3.12
1.93
0.62
927
23
22
3.82
1.91
0.50
869
3.57
1.79
0.50
918
3.33
1.66
0.50
951
24
18
3.43
2.68
0.78
804
3.15
2.46
0.78
853
2.91
2.27
0.78
886
24
20
3.61
2.38
0.66
836
3.36
2.22
0.66
877
3.12
2.06
0.66
927
24
22
3.82
2.06
0.54
869
3.57
1.93
0.54
918
3.33
1.80
0.54
951
24
24
4.03
1.69
0.42
902
3.78
1.59
0.42
943
3.57
1.50
0.42
984
25
18
3.43
2.81
0.82
804
3.15
2.58
0.82
853
2.91
2.38
0.82
886
25
20
3.61
2.52
0.70
836
3.36
2.35
0.70
877
3.12
2.18
0.70
927
25
22
3.82
2.21
0.58
869
3.57
2.07
0.58
918
3.33
1.93
0.58
951
25
24
4.03
1.85
0.46
902
3.78
1.74
0.46
943
3.57
1.64
0.46
984
26
18
3.43
2.95
0.86
804
3.15
2.71
0.86
853
2.91
2.50
0.86
886
26
20
3.61
2.67
0.74
836
3.36
2.49
0.74
877
3.12
2.31
0.74
927
26
22
3.82
2.37
0.62
869
3.57
2.21
0.62
918
3.33
2.06
0.62
951
26
24
4.03
2.01
0.50
902
3.78
1.89
0.50
943
3.57
1.79
0.50
984
26
26
4.24
1.61
0.38
935
3.99
1.52
0.38
976
3.75
1.42
0.38
1017
27
18
3.43
3.09
0.90
804
3.15
2.84
0.90
853
2.91
2.61
0.90
886
27
20
3.61
2.81
0.78
836
3.36
2.62
0.78
877
3.12
2.43
0.78
927
27
22
3.82
2.52
0.66
869
3.57
2.36
0.66
918
3.33
2.19
0.66
951
27
24
4.03
2.17
0.54
902
3.78
2.04
0.54
943
3.57
1.93
0.54
984
27
26
4.24
1.78
0.42
935
3.99
1.68
0.42
976
3.75
1.57
0.42
1017
28
18
3.43
3.22
0.94
804
3.15
2.96
0.94
853
2.91
2.73
0.94
886
28
20
3.61
2.96
0.82
836
3.36
2.76
0.82
877
3.12
2.55
0.82
927
28
22
3.82
2.67
0.70
869
3.57
2.50
0.70
918
3.33
2.33
0.70
951
28
24
4.03
2.33
0.58
902
3.78
2.19
0.58
943
3.57
2.07
0.58
984
28
26
4.24
1.95
0.46
935
3.99
1.84
0.46
976
3.75
1.72
0.46
1017
29
18
3.43
3.36
0.98
804
3.15
3.09
0.98
853
2.91
2.85
0.98
886
29
20
3.61
3.10
0.86
836
3.36
2.89
0.86
877
3.12
2.68
0.86
927
29
22
3.82
2.82
0.74
869
3.57
2.64
0.74
918
3.33
2.46
0.74
951
29
24
4.03
2.50
0.62
902
3.78
2.34
0.62
943
3.57
2.21
0.62
984
29
26
4.24
2.12
0.50
935
3.99
2.00
0.50
976
3.75
1.87
0.50
1017
30
18
3.43
3.43
1.00
804
3.15
3.15
1.00
853
2.91
2.91
1.00
886
30
20
3.61
3.24
0.90
836
3.36
3.02
0.90
877
3.12
2.80
0.90
927
30
22
3.82
2.98
0.78
869
3.57
2.78
0.78
918
3.33
2.59
0.78
951
30
24
4.03
2.66
0.66
902
3.78
2.49
0.66
943
3.57
2.36
0.66
984
30
26
4.24
2.29
0.54
935
3.99
2.15
0.54
976
3.75
2.02
0.54
1017
31
18
3.43
3.43
1.00
804
3.15
3.15
1.00
853
2.91
2.91
1.00
886
31
20
3.61
3.39
0.94
836
3.36
3.16
0.94
877
3.12
2.93
0.94
927
31
22
3.82
3.13
0.82
869
3.57
2.93
0.82
918
3.33
2.73
0.82
951
31
24
4.03
2.82
0.70
902
3.78
2.65
0.70
943
3.57
2.50
0.70
984
31
26
4.24
2.46
0.58
935
3.99
2.31
0.58
976
3.75
2.17
0.58
1017
32
18
3.43
3.43
1.00
804
3.15
3.15
1.00
853
2.91
2.91
1.00
886
32
20
3.61
3.53
0.98
836
3.36
3.29
0.98
877
3.12
3.05
0.98
927
32
22
3.82
3.28
0.86
869
3.57
3.07
0.86
918
3.33
2.86
0.86
951
32
24
4.03
2.98
0.74
902
3.78
2.80
0.74
943
3.57
2.64
0.74
984
32
26
4.24
2.63
0.62
935
3.99
2.47
0.62
976
3.75
2.32
0.62
1017
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
20
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH50VE
CAPACITY: 5.0 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.73
INPUT: 1380 W
OUTDOOR DB (°C)
21
25
27
30
SHF
INPUT
21
18
5.88
3.23
0.55
1104
5.63
3.09
0.55
1159
5.40
2.97
0.55
1214
5.20
2.86
0.55
1270
21
20
6.13
2.63
0.43
1159
5.88
2.53
0.43
1228
5.70
2.45
0.43
1256
5.50
2.37
0.43
1311
22
18
5.88
3.47
0.59
1104
5.63
3.32
0.59
1159
5.40
3.19
0.59
1214
5.20
3.07
0.59
1270
22
20
6.13
2.88
0.47
1159
5.88
2.76
0.47
1228
5.70
2.68
0.47
1256
5.50
2.59
0.47
1311
22
22
6.38
2.23
0.35
1201
6.15
2.15
0.35
1277
6.00
2.10
0.35
1311
5.75
2.01
0.35
1366
23
18
5.88
3.70
0.63
1104
5.63
3.54
0.63
1159
5.40
3.40
0.63
1214
5.20
3.28
0.63
1270
23
20
6.13
3.12
0.51
1159
5.88
3.00
0.51
1228
5.70
2.91
0.51
1256
5.50
2.81
0.51
1311
23
22
6.38
2.49
0.39
1201
6.15
2.40
0.39
1277
6.00
2.34
0.39
1311
5.75
2.24
0.39
1366
24
18
5.88
3.94
0.67
1104
5.63
3.77
0.67
1159
5.40
3.62
0.67
1214
5.20
3.48
0.67
1270
24
20
6.13
3.37
0.55
1159
5.88
3.23
0.55
1228
5.70
3.14
0.55
1256
5.50
3.03
0.55
1311
24
22
6.38
2.74
0.43
1201
6.15
2.64
0.43
1277
6.00
2.58
0.43
1311
5.75
2.47
0.43
1366
24
24
6.70
2.08
0.31
1256
6.45
2.00
0.31
1325
6.30
1.95
0.31
1366
6.10
1.89
0.31
1435
25
18
5.88
4.17
0.71
1104
5.63
3.99
0.71
1159
5.40
3.83
0.71
1214
5.20
3.69
0.71
1270
25
20
6.13
3.61
0.59
1159
5.88
3.47
0.59
1228
5.70
3.36
0.59
1256
5.50
3.25
0.59
1311
25
22
6.38
3.00
0.47
1201
6.15
2.89
0.47
1277
6.00
2.82
0.47
1311
5.75
2.70
0.47
1366
25
24
6.70
2.35
0.35
1256
6.45
2.26
0.35
1325
6.30
2.21
0.35
1366
6.10
2.14
0.35
1435
26
18
5.88
4.41
0.75
1104
5.63
4.22
0.75
1159
5.40
4.05
0.75
1214
5.20
3.90
0.75
1270
26
20
6.13
3.86
0.63
1159
5.88
3.70
0.63
1228
5.70
3.59
0.63
1256
5.50
3.47
0.63
1311
26
22
6.38
3.25
0.51
1201
6.15
3.14
0.51
1277
6.00
3.06
0.51
1311
5.75
2.93
0.51
1366
26
24
6.70
2.61
0.39
1256
6.45
2.52
0.39
1325
6.30
2.46
0.39
1366
6.10
2.38
0.39
1435
26
26
6.90
1.86
0.27
1325
6.70
1.81
0.27
1394
6.60
1.78
0.27
1435
6.40
1.73
0.27
1477
27
18
5.88
4.64
0.79
1104
5.63
4.44
0.79
1159
5.40
4.27
0.79
1214
5.20
4.11
0.79
1270
27
20
6.13
4.10
0.67
1159
5.88
3.94
0.67
1228
5.70
3.82
0.67
1256
5.50
3.69
0.67
1311
27
22
6.38
3.51
0.55
1201
6.15
3.38
0.55
1277
6.00
3.30
0.55
1311
5.75
3.16
0.55
1366
27
24
6.70
2.88
0.43
1256
6.45
2.77
0.43
1325
6.30
2.71
0.43
1366
6.10
2.62
0.43
1435
27
26
6.90
2.14
0.31
1325
6.70
2.08
0.31
1394
6.60
2.05
0.31
1435
6.40
1.98
0.31
1477
28
18
5.88
4.88
0.83
1104
5.63
4.67
0.83
1159
5.40
4.48
0.83
1214
5.20
4.32
0.83
1270
28
20
6.13
4.35
0.71
1159
5.88
4.17
0.71
1228
5.70
4.05
0.71
1256
5.50
3.91
0.71
1311
28
22
6.38
3.76
0.59
1201
6.15
3.63
0.59
1277
6.00
3.54
0.59
1311
5.75
3.39
0.59
1366
28
24
6.70
3.15
0.47
1256
6.45
3.03
0.47
1325
6.30
2.96
0.47
1366
6.10
2.87
0.47
1435
28
26
6.90
2.42
0.35
1325
6.70
2.35
0.35
1394
6.60
2.31
0.35
1435
6.40
2.24
0.35
1477
29
18
5.88
5.11
0.87
1104
5.63
4.89
0.87
1159
5.40
4.70
0.87
1214
5.20
4.52
0.87
1270
29
20
6.13
4.59
0.75
1159
5.88
4.41
0.75
1228
5.70
4.28
0.75
1256
5.50
4.13
0.75
1311
29
22
6.38
4.02
0.63
1201
6.15
3.87
0.63
1277
6.00
3.78
0.63
1311
5.75
3.62
0.63
1366
29
24
6.70
3.42
0.51
1256
6.45
3.29
0.51
1325
6.30
3.21
0.51
1366
6.10
3.11
0.51
1435
29
26
6.90
2.69
0.39
1325
6.70
2.61
0.39
1394
6.60
2.57
0.39
1435
6.40
2.50
0.39
1477
30
18
5.88
5.35
0.91
1104
5.63
5.12
0.91
1159
5.40
4.91
0.91
1214
5.20
4.73
0.91
1270
30
20
6.13
4.84
0.79
1159
5.88
4.64
0.79
1228
5.70
4.50
0.79
1256
5.50
4.35
0.79
1311
30
22
6.38
4.27
0.67
1201
6.15
4.12
0.67
1277
6.00
4.02
0.67
1311
5.75
3.85
0.67
1366
30
24
6.70
3.69
0.55
1256
6.45
3.55
0.55
1325
6.30
3.47
0.55
1366
6.10
3.36
0.55
1435
30
26
6.90
2.97
0.43
1325
6.70
2.88
0.43
1394
6.60
2.84
0.43
1435
6.40
2.75
0.43
1477
31
18
5.88
5.58
0.95
1104
5.63
5.34
0.95
1159
5.40
5.13
0.95
1214
5.20
4.94
0.95
1270
31
20
6.13
5.08
0.83
1159
5.88
4.88
0.83
1228
5.70
4.73
0.83
1256
5.50
4.57
0.83
1311
31
22
6.38
4.53
0.71
1201
6.15
4.37
0.71
1277
6.00
4.26
0.71
1311
5.75
4.08
0.71
1366
31
24
6.70
3.95
0.59
1256
6.45
3.81
0.59
1325
6.30
3.72
0.59
1366
6.10
3.60
0.59
1435
31
26
6.90
3.24
0.47
1325
6.70
3.15
0.47
1394
6.60
3.10
0.47
1435
6.40
3.01
0.47
1477
32
18
5.88
5.82
0.99
1104
5.63
5.57
0.99
1159
5.40
5.35
0.99
1214
5.20
5.15
0.99
1270
32
20
6.13
5.33
0.87
1159
5.88
5.11
0.87
1228
5.70
4.96
0.87
1256
5.50
4.79
0.87
1311
32
22
6.38
4.78
0.75
1201
6.15
4.61
0.75
1277
6.00
4.50
0.75
1311
5.75
4.31
0.75
1366
32
24
6.70
4.22
0.63
1256
6.45
4.06
0.63
1325
6.30
3.97
0.63
1366
6.10
3.84
0.63
1435
32
26
6.90
3.52
0.51
1325
6.70
3.42
0.51
1394
6.60
3.37
0.51
1435
6.40
3.26
0.51
1477
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
21
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA COOL operation at Rated frequency
MUZ-FH50VE
CAPACITY: 5.0 kW
INDOOR INDOOR
DB (°C) WB (°C)
SHF: 0.73
INPUT: 1380 W
OUTDOOR DB (°C)
35
40
46
SHF
INPUT
21
18
4.90
2.70
0.55
1352
4.50
2.48
0.55
1435
4.15
2.28
0.55
1490
21
20
5.15
2.21
0.43
1408
4.80
2.06
0.43
1477
4.45
1.91
0.43
1559
22
18
4.90
2.89
0.59
1352
4.50
2.66
0.59
1435
4.15
2.45
0.59
1490
22
20
5.15
2.42
0.47
1408
4.80
2.26
0.47
1477
4.45
2.09
0.47
1559
22
22
5.45
1.91
0.35
1463
5.10
1.79
0.35
1546
4.75
1.66
0.35
1601
23
18
4.90
3.09
0.63
1352
4.50
2.84
0.63
1435
4.15
2.61
0.63
1490
23
20
5.15
2.63
0.51
1408
4.80
2.45
0.51
1477
4.45
2.27
0.51
1559
23
22
5.45
2.13
0.39
1463
5.10
1.99
0.39
1546
4.75
1.85
0.39
1601
24
18
4.90
3.28
0.67
1352
4.50
3.02
0.67
1435
4.15
2.78
0.67
1490
24
20
5.15
2.83
0.55
1408
4.80
2.64
0.55
1477
4.45
2.45
0.55
1559
24
22
5.45
2.34
0.43
1463
5.10
2.19
0.43
1546
4.75
2.04
0.43
1601
24
24
5.75
1.78
0.31
1518
5.40
1.67
0.31
1587
5.10
1.58
0.31
1656
25
18
4.90
3.48
0.71
1352
4.50
3.20
0.71
1435
4.15
2.95
0.71
1490
25
20
5.15
3.04
0.59
1408
4.80
2.83
0.59
1477
4.45
2.63
0.59
1559
25
22
5.45
2.56
0.47
1463
5.10
2.40
0.47
1546
4.75
2.23
0.47
1601
25
24
5.75
2.01
0.35
1518
5.40
1.89
0.35
1587
5.10
1.79
0.35
1656
26
18
4.90
3.68
0.75
1352
4.50
3.38
0.75
1435
4.15
3.11
0.75
1490
26
20
5.15
3.24
0.63
1408
4.80
3.02
0.63
1477
4.45
2.80
0.63
1559
26
22
5.45
2.78
0.51
1463
5.10
2.60
0.51
1546
4.75
2.42
0.51
1601
26
24
5.75
2.24
0.39
1518
5.40
2.11
0.39
1587
5.10
1.99
0.39
1656
26
26
6.05
1.63
0.27
1573
5.70
1.54
0.27
1642
5.35
1.44
0.27
1711
27
18
4.90
3.87
0.79
1352
4.50
3.56
0.79
1435
4.15
3.28
0.79
1490
27
20
5.15
3.45
0.67
1408
4.80
3.22
0.67
1477
4.45
2.98
0.67
1559
27
22
5.45
3.00
0.55
1463
5.10
2.81
0.55
1546
4.75
2.61
0.55
1601
27
24
5.75
2.47
0.43
1518
5.40
2.32
0.43
1587
5.10
2.19
0.43
1656
27
26
6.05
1.88
0.31
1573
5.70
1.77
0.31
1642
5.35
1.66
0.31
1711
28
18
4.90
4.07
0.83
1352
4.50
3.74
0.83
1435
4.15
3.44
0.83
1490
28
20
5.15
3.66
0.71
1408
4.80
3.41
0.71
1477
4.45
3.16
0.71
1559
28
22
5.45
3.22
0.59
1463
5.10
3.01
0.59
1546
4.75
2.80
0.59
1601
28
24
5.75
2.70
0.47
1518
5.40
2.54
0.47
1587
5.10
2.40
0.47
1656
28
26
6.05
2.12
0.35
1573
5.70
2.00
0.35
1642
5.35
1.87
0.35
1711
29
18
4.90
4.26
0.87
1352
4.50
3.92
0.87
1435
4.15
3.61
0.87
1490
29
20
5.15
3.86
0.75
1408
4.80
3.60
0.75
1477
4.45
3.34
0.75
1559
29
22
5.45
3.43
0.63
1463
5.10
3.21
0.63
1546
4.75
2.99
0.63
1601
29
24
5.75
2.93
0.51
1518
5.40
2.75
0.51
1587
5.10
2.60
0.51
1656
29
26
6.05
2.36
0.39
1573
5.70
2.22
0.39
1642
5.35
2.09
0.39
1711
30
18
4.90
4.46
0.91
1352
4.50
4.10
0.91
1435
4.15
3.78
0.91
1490
30
20
5.15
4.07
0.79
1408
4.80
3.79
0.79
1477
4.45
3.52
0.79
1559
30
22
5.45
3.65
0.67
1463
5.10
3.42
0.67
1546
4.75
3.18
0.67
1601
30
24
5.75
3.16
0.55
1518
5.40
2.97
0.55
1587
5.10
2.81
0.55
1656
30
26
6.05
2.60
0.43
1573
5.70
2.45
0.43
1642
5.35
2.30
0.43
1711
31
18
4.90
4.66
0.95
1352
4.50
4.28
0.95
1435
4.15
3.94
0.95
1490
31
20
5.15
4.27
0.83
1408
4.80
3.98
0.83
1477
4.45
3.69
0.83
1559
31
22
5.45
3.87
0.71
1463
5.10
3.62
0.71
1546
4.75
3.37
0.71
1601
31
24
5.75
3.39
0.59
1518
5.40
3.19
0.59
1587
5.10
3.01
0.59
1656
31
26
6.05
2.84
0.47
1573
5.70
2.68
0.47
1642
5.35
2.51
0.47
1711
32
18
4.90
4.85
0.99
1352
4.50
4.46
0.99
1435
4.15
4.11
0.99
1490
32
20
5.15
4.48
0.87
1408
4.80
4.18
0.87
1477
4.45
3.87
0.87
1559
32
22
5.45
4.09
0.75
1463
5.10
3.83
0.75
1546
4.75
3.56
0.75
1601
32
24
5.75
3.62
0.63
1518
5.40
3.40
0.63
1587
5.10
3.21
0.63
1656
32
26
6.05
3.09
0.51
1573
5.70
2.91
0.51
1642
5.35
2.73
0.51
1711
NOTE
Q
SHC
SHF
INPUT
Q
SHC
SHF
INPUT
Q
SHC
Q : Total capacity (kW)
SHC : Sensible heat capacity (kW)
OBH624A
SHF : Sensible heat factor
INPUT : Total power input (W)
22
DB : Dry-bulb temperature
WB : Wet-bulb temperature
PERFORMANCE DATA HEAT operation at Rated frequency
MUZ-FH25VE
CAPACITY: 3.2 kW
INDOOR
DB (°C)
INPUT: 580 W
OUTDOOR WB (°C)
-10
-5
0
5
10
15
20
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
15
2.02
377
2.43
452
2.85
510
3.26
551
3.68
586
4.06
603
4.48
615
21
1.92
406
2.30
481
2.72
534
3.10
574
3.52
603
3.90
621
4.30
644
26
1.73
435
2.14
510
2.53
563
2.94
603
3.36
632
3.74
650
4.16
667
MUZ-FH35VE
CAPACITY: 4.0 kW
INDOOR
DB (°C)
INPUT: 800 W
OUTDOOR WB (°C)
-10
-5
0
5
10
15
20
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
15
2.52
520
3.04
624
3.56
704
4.08
760
4.60
808
5.08
832
5.60
848
21
2.40
560
2.88
664
3.40
736
3.88
792
4.40
832
4.88
856
5.38
888
26
2.16
600
2.68
704
3.16
776
3.68
832
4.20
872
4.68
896
5.20
920
MUZ-FH50VE
CAPACITY: 6.0 kW
INDOOR
DB (°C)
INPUT: 1480 W
OUTDOOR WB (°C)
-10
-5
0
5
10
15
20
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
Q
INPUT
15
3.78
962
4.56
1154
5.34
1302
6.12
1406
6.90
1495
7.62
1539
8.40
1569
21
3.60
1036
4.32
1228
5.10
1362
5.82
1465
6.60
1539
7.32
1584
8.07
1643
26
3.24
1110
4.02
1302
4.74
1436
5.52
1539
6.30
1613
7.02
1658
7.80
1702
NOTE: Q: Total capacity (kW) INPUT : Total power input (W) DB: Dry-bulb temperature WB: Wet-bulb temperature
OBH624A
23
9
ACTUATOR CONTROL
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
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 . . . . . . . . . . . . . . . . . ON
Cooling . . . . . . . . . . . . . . . . . OFF
Dry . . . . . . . . . . . . . . . . . . . . OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL>
<HEAT>
5 seconds
Compressor
ON
OFF
R.V.coil
ON
OFF
5 seconds
Outdoor fan ON
OFF
motor
9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger temperature thermistor
OBH624A
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protection
Heating: Defrosting
Protection
Cooling: Low ambient temperature operation
Heating: Defrosting (Heater)
Cooling: Low ambient temperature operation
Cooling: High pressure protection
Actuator
Outdoor fan R.V.coil
motor
Compressor
LEV
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
24
○
Indoor fan
motor
Defrost
heater
○
○
10
SERVICE FUNCTIONS
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
10-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board.
(Refer to 11-6-1.)
Jumper wire
JS
Soldered (Initial setting)
None (Cut)
Defrost finish temperature (°C)
MUZ-FH25/35VE
MUZ-FH50VE
5
10
10
18
10-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
MUZ-FH25/35
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low discharge temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature is
20°C or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)
MUZ-FH50
Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature (0°C or less)
may cause the following troubles. To prevent those troubles, activate the pre-heat control.
1) If moisture gets into the refrigerant cycle and freezes, it may interfer the start-up of the compressor.
2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur.
The pre-heat control turns ON when the compressor temperature is 20°C or below. When the pre-heat control turns ON,
the compressor is energized. (About 70 W)
Pre-heat control setting
<JK>
ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board.
OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board.
(Refer to 11-6.1)
NOTE: When the inverter P.C. board is replaced, check JK wire, and cut/solder it if necessary.
OBH624A
25
11
TROUBLESHOOTING
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
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 of 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.
OBH624A
26
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.
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 OPERATION SELECT button and TEMP
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 figure 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
1. Regardless of normal or abnormal condition,
a short beep is emitted once the signal is
received.
Does POWER 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 POWER lamp.
2
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function. (Refer to 11-2.2)
No
(OFF)
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does POWER lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
Yes
No
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 confirm 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:
Blinking at 0.52.5-second OFF second interval
Blinking at 0.52.5-second OFF second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.52.5-second OFF
3-second ON
second interval
Beeps
Repeated cycle
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
OBH624A
Beeps
No beep
Repeated cycle
27
Beeps
Repeated cycle
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Confirm if outdoor unit is abnormal according to the following procedures.
Confirm that the remote controller is in the failure mode recall function.
With the remote controller headed towards the indoor unit, press TEMP
button to adjust the set temperature to 25°C. 1
Does POWER 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 POWER
lamp. 2
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
NOTE: It takes up to 1 minute to indicate the outdoor unit
abnormality.
Even if POWER lamp is not lighting, keep checking at least 1 minute or longer.
No
(OFF)
Yes
(Blinks)
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
The outdoor unit is normal.
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.
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. 4
Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.
4 The information regarding whether the
connected outdoor unit is a low-standbypower model or a non-low-standby-power
model will also be initialized.
(Default= compatible with a low-standbypower model)
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
Blinking at 0.5second interval
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
OBH624A
No beep
Repeated cycle
Beeps
28
Beeps
Repeated cycle
3. Outdoor unit failure mode table
POWER lamp
(Indoor unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C. board)
Condition
Remedy
—
—
OFF
None (Normal)
—
1-time flash
2.5 seconds
OFF
Indoor/outdoor
communication, receiving
error
—
Indoor/outdoor
communication, receiving
error
—
2-time flash
2.5 seconds
OFF
Outdoor power system
3-time flash
2.5 seconds
OFF
Discharge temperature
thermistor
Defrost thermistor
1-time flash every
2.5 seconds
Fin temperature thermistor
3-time flash
2.5 seconds OFF
P.C. board temperature
thermistor
4-time flash
2.5 seconds OFF
Ambient temperature
thermistor
2-time flash
2.5 seconds OFF
—
Outdoor heat exchanger
temperature thermistor
4-time flash
2.5 seconds
OFF
Overcurrent
Compressor synchronous
abnormality (Compressor
start-up failure protection)
•Refer to 11-5. How
Any signals from the inverter P.C.
board cannot be received normally for to check miswiring and
serial signal error.
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.
• 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
identified by checking
the blinking pattern of
LED.
12-time flash
2.5 seconds OFF
Large current flows into power module • Reconnect
compressor connector.
(IC700) (FH25/35)/ IGBT module
• Refer to 11-5. "How
(IC700) (FH50).
to check inverter/
compressor".
• Check stop valve.
• Reconnect
Waveform of compressor current is
distorted.
compressor connector.
• Refer to 11-5. "How
to check inverter/
compressor".
—
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 fin temperature
thermistor on the inverter P.C. board
exceeds 75 ~ 86°C (FH25/35)/75 ~
80°C (FH50), or temperature of P.C.
board temperature thermistor on the
inverter P.C. board exceeds 72 ~ 85°C
(FH25/35)/70 ~ 75°C (FH50).
Outdoor fan has stopped 3 times in a
row within 30 seconds after outdoor
fan start-up.
• Check around outdoor
unit.
• Check outdoor unit air
passage.
• Refer to 11-5. "Check
of outdoor fan motor".
Discharge temperature
6-time flash
2.5 seconds
OFF
High pressure
7-time flash
2.5 seconds
OFF
Fin temperature/ P.C. board
temperature
8-time flash
2.5 seconds
OFF
Outdoor fan motor
9-time flash
2.5 seconds
OFF
Nonvolatile memory data
5-time flash
2.5 seconds OFF
Nonvolatile memory data cannot be
read properly.
Power module (IC700)
(FH25/35)
IGBT module (IC700) (FH50)
6-time flash
2.5 seconds OFF
The interface short circuit occurs in the • Refer to 11-5. "How
to check inverter/
output of the power module (IC700)
compressor".
(FH25/35)/IGBT module (IC700)
(FH50).
The compressor winding shorts circuit.
7-time flash
2.5 seconds OFF
—
• Refer to 11-5. "Check
of outdoor fan motor".
Refer to 11-5. "Check
of inverter P.C. board".
• Replace the inverter
P.C. board.
10-time flash
2.5 seconds
OFF
Discharge temperature
11-time flash
2.5 seconds
OFF
Bus-bar voltage (DC)
8-time flash
2.5 seconds OFF
Each phase current of
compressor
9-time flash
2.5 seconds OFF
Temperature of discharge temperature • Refer to 11-5. "Check
of LEV".
thermistor has been 50°C or less for
20 minutes.
• Check refrigerant
circuit and refrigerant
amount.
Bus-bar voltage of inverter cannot be • Refer to 11-5. "How
detected normally.
to check inverter/
compressor".
Each phase current of compressor
cannot be detected normally.
Stop valve (Closed valve)
14-time flash
2.5 seconds OFF
Closed valve is detected by
compressor current.
—
• Check stop valve.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.).
OBH624A
—
—
○
○
○
○
○
○
—
○
—
○
—
○
—
○
—
○
—
○
○
○
—
○
—
○
○
○
—
11-time flash
2.5 seconds OFF
5-time flash
2.5 seconds
OFF
14-time flash
2.5 seconds
OFF
Indoor/outdoor
Outdoor unit
unit failure
failure mode
mode recall
recall function
function
29
11-3. TROUBLESHOOTING CHECK TABLE
No.
1
Symptom
Outdoor unit
does not operate.
Abnormal point/
Condition
1-time flash every Outdoor power sys2.5 seconds
tem
LED indication
6-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
14-time flash
2.5 seconds OFF
Stop valve/
Closed valve
Outdoor unit
(Other abnormality)
Closed valve is detected by compressor current.
'Outdoor unit 2-time flash
2.5 seconds OFF
stops and
restarts 3
minutes later'
is repeated.
3-time flash
2.5 seconds OFF
Overcurrent protection
Large current flows into power module (IC700) (FH25/35)/
IGBT module (IC700) (FH50).
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.
Temperature of fin temperature thermistor on the heat sink exceeds 75 ~ 86°C (FH25/35)/75 ~ 80°C (FH50) or temperature
of P.C. board temperature thermistor on the inverter P.C.board
exceeds 72 ~ 85°C (FH25/35)/70 ~ 75°C (FH50).
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
5
6
8
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Outdoor control sys- Nonvolatile memory data cannot be read properly.
tem
(POWER lamp of the indoor unit lights up or flashes 7-time.)
Serial signal
The communication fails between the indoor and outdoor unit
for 3 minutes.
3
4
4-time flash
2.5 seconds OFF
9
10
5-time flash
2.5 seconds OFF
11
8-time flash
2.5 seconds OFF
12
13
Outdoor unit is defective.
10-time flash
2.5 seconds OFF
The waveform of compressor current is distorted.
Compressor synchronous abnormality
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
12-time flash
2.5 seconds OFF
13-time flash
2.5 seconds OFF
Each phase current
of compressor
Bus-bar voltage
(DC)
Each phase current of compressor cannot be detected normally.
Bus-bar voltage of inverter cannot be detected normally.
1-time flash
2.5 seconds OFF
Frequency drop by
current protection
3-time flash
2.5 seconds OFF
Frequency drop by
high pressure protection
Frequency drop by
defrosting in COOL
mode
Frequency drop by
discharge temperature protection
When the input current exceeds approximately
10A (FH25)/10.5A (FH35), compressor frequency
lowers.
FH50
Current from power outlet is nearing breaker capacity.
Temperature of indoor coil thermistor exceeds 55°C in HEAT
mode, compressor frequency lowers.
14
Outdoor unit
operates.
15
16
17
18
Remedy
• Reconnect connector of compressor.
• Refer to 11-5. "How to check inverter/compressor".
• Check stop valve.
Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, • Refer to 11-5. "Check of outdoor
defrost thermistor, P.C. board temperature thermistor, outdoor thermistors".
heat exchanger temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.
2
7
Condition
4-time flash
2.5 seconds OFF
MUZ-FH25/35
5-time flash
2.5 seconds OFF
OBH624A
FH25/35
• Replace inverter P.C. board.
• Check connection between the inverter P.C. board and the relay P.C.
board. (FH50)
• 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".
• Reconnect connector of compressor.
• Refer to 11-5. "How to check inverter/compressor".
• Check stop valve.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-5. "Check of LEV".
• 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".
• Refer to 11-5. "Check of outdoor
fan motor.
• Refer to 11-5. "Check of inverter
P.C. board.
• Refer to 11-5. "How to check inverter/compressor".
• It occurs with following case.
Instantaneous power voltage drop.
(Short time power failure) (FH50)
• Refer to 11-5. "Check of power
supply". (FH50)
• Refer to 11-5. "How to check inverter/compressor".
The unit is normal, but check the
following.
• Check if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air
circulation is short cycled.
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.
Outside temperature When the outside temperature thermistor shorts or opens,
protective operation without that thermistor is performed.
thermistor protection
30
• 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.
No.
Symptom
19
Outdoor unit
operates.
LED indication
7-time flash
2.5 seconds OFF
8-time flash
2.5 seconds OFF
Abnormal point/
Condition
Low discharge temperature protection
MUZ-FH25/35
PAM protection
PAM: Pulse Amplitude Modulation
Condition
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
• Refer to 11-5. "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
The overcurrent flows into PFC (Power factor correction :
IC820) or the bus-bar voltage reaches 394 V or more, PAM
stops and restarts.
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.
• It occurs with following cases.
1 Instantaneous power voltage
drop. (Short time power failure)
2 Distortion of primary voltage
• Refer to 11-5. "Check of power
supply".
• Check if the connector of the compressor is correctly connected.
Refer to 11-5. "How to check
inverter/compressor".
20
Zero cross signal cannot be detected.
MUZ-FH50
Zero cross detecting
circuit
21
9-time flash
2.5 seconds OFF
Remedy
Inverter check mode The connector of compressor is disconnected, inverter check
mode starts.
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6.1.
2. LED is lighted during normal operation.
Inverter P.C. board
MUZ-FH25/35VE
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
0.5-second ON
0.5-second ON
Flashing →
LED
ON
OFF
2.5-second OFF
MUZ-FH50VE
2.5-second OFF
Flashing
→
LED
OBH624A
31
11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH50VE
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Check method and criterion
Figure
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.
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
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 terminals using a tester.
(Temperature: -10 ~ 40°C)
WHT
RED BLK
Normal (Ω)
MUZ-FH25/35VE
MUZ-FH50VE
Compressor
U-V
U-W
V-W
1.66 ~ 2.26
0.87 ~ 1.18
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
Outdoor fan motor
RED – BLK
BLK – WHT
WHT – RED
W
V
WHT
U
RED BLK
Normal (Ω)
MUZ-FH25/35VE
MUZ-FH50VE
12 ~ 16
12 ~ 17
W
V
U
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (kΩ)
MUZ-FH25/35VE
MUZ-FH50VE
R. V. coil (21S4)
1.41 ~ 2.00
1.19 ~ 1.78
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
OBH624A
Normal (Ω)
WHT
LEV
37 ~ 54
32
RED
(+12V)
BLU
ORN
YLW
Expansion valve coil
(LEV)
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
11-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector between the compressor
and the power module (IC700) (MUZ-FH25/35)/IGBT
module (IC700) (MUZ-FH50).
See 11-5.
Check the voltage between terminals.
Are the voltages balanced?
Yes
No
Replace the inverter P.C. board.
See 11-5.
Check the compressor.
“Check of open phase”.
“Check of compressor”.
B Check of open phase
● With the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT module (IC700) (MUZ-FH50)
disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance 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 OPERATION: Refer to 8-3.)
<<Measurement point>>
At 3 points
Measure AC voltage between the lead wires at 3 points.
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
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 flashes 9 times. (Refer to 11-6.1.)
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
No
No
Replace the compressor.
Refer to 11-5.
OK.
OBH624A
33
“Check of compressor start failure”.
D Check of compressor winding
● Disconnect the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT module (IC700)
(MUZ-FH50), and measure the resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
Measure the resistance between the lead wires at 3 points.
BLK-RED
WHT-RED
<<Judgement>>
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
<<Judgement>>
● Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<<Operation 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.
0 second
Compressor starts
1 second
Abnormal
(IPM failure)
(Compressor winding short)
2 seconds
Abnormal
(Compressor lock out)
(Starting defect)
10 seconds
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
10 minutes
Normal
F Check of compressor start failure
Confirm that ~ is normal.
•Electrical circuit check
. Contact of the compressor connector
. Output voltage of inverter P.C. board and balance of them (See 11-5. )
. Direct current voltage between DB61(+) and (-) (MUZ-FH25/35)/JP715(+)
and JP30(-) (MUZ-FH50) 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?
Yes
Check the refrigerant circuit.
Check the stop valve.
No
After the compressor is heated with a drier,
does the compressor start? 1
No
Replace the compressor.
Yes
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Compressor start failure. Activate pre-heat control.
(Refer to 10-2. "PRE-HEAT CONTROL SETTING")
Heating part
OBH624A
34
G Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Is the resistance of 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
Replace the inverter P.C. board.
OK.
(Cause is poor contact.)
MUZ-FH25/35
Thermistor
Symbol
Connector, Pin No.
Defrost
RT61 Between CN641 pin1 and pin2
Discharge temperature
RT62 Between CN641 pin3 and pin4
Fin temperature
RT64 Between CN642 pin1 and pin2
Ambient temperature
RT65 Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
Board
Inverter P.C. board
MUZ-FH50
Thermistor
Symbol
Connector, Pin No.
Defrost
RT61 Between CN671 pin1 and pin2
Discharge temperature
RT62 Between CN671 pin3 and pin4
Fin temperature
RT64 Between CN673 pin1 and pin2
Ambient temperature
RT65 Between CN672 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6
OBH624A
35
Board
Inverter P.C. board
H Check of R.V. coil
MUZ-FH25/35
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 disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector
although no signal is 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 between the
compressor and the power module
(IC700).
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 inverter
P.C. board.
Yes
Replace the 4-way valve.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector between the
compressor and the power module
(IC700).
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?
Replace the inverter
Yes P.C. board.
No
Replace the 4-way valve.
MUZ-FH50
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.
In case CN602 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector
although no signal is being transmitted to R.V. coil.
Check if CN602 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector between the
compressor and the IGBT module
(IC700).
Turn ON the power supply and press
EMERGENCY OPERATION switch
twice (HEAT mode).
Is there 230 VAC between CN602 and
on the inverter P.C. board 3 minutes
after the power supply is turned ON?
No
Replace the inverter
P.C. board.
Yes
Replace the 4-way valve.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector between the
compressor and the IGBT module
(IC700).
Turn ON the power supply and
press EMERGENCY OPERATION
switch once (COOL mode).
Is there 230 VAC between CN602 and
on the inverter P.C. board 3 minutes
after the power supply is turned ON?
No
Replace the 4-way valve.
OBH624A
36
Replace the inverter
Yes P.C. board.
I Check of outdoor fan motor
Disconnect the connectors CN931
and CN932 from the inverter P.C.
board.
Check the connection between the
connector CN931 and CN932.
Is the resistance between each terminal of outdoor fan motor normal?
(Refer to 11-4.)
No
Yes
Disconnect CN932 from the inverter P.C. board, and turn on the
power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5 or 0 VDC)
No
No
Does the voltage between each terminal become 5 and 0
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Replace the inverter P.C. board.
Replace the outdoor fan motor.
OBH624A
37
J Check of power supply
Disconnect the connector between the
compressor and the power module
(IC700) (MUZ-FH25/35)/IGBT module
(IC700) (MUZ-FH50).
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does POWER lamp on the indoor
unit light up?
Rectify indoor/outdoor
connecting wire.
No
Yes
Is there voltage 230 VAC
between the indoor terminal
block S1 and S2?
No
Replace the indoor
electronic control P.C.
board.
Yes
Is there bus-bar voltage 260 - 370
VDC between DB61 (+) and DB61 (–)
(MUZ-FH25/35)/325 - 370 VDC
between JP715 (+) and JP30 (–)
(MUZ-FH50) on the inverter P.C.
board? (Refer to 11-6.1.)
No
Check the electric parts in main circuit.
Yes
Does LED on the inverter P.C.
board light up or flash?
(Refer to 11-6.1.)
Yes
If light up, OK.
If flash, refer to 11-3.
No
Replace the inverter
P.C. board.
260 - 370 VDC
DB61
Inverter P.C. board
(Solder side)
MUZ-FH25/35
JP30
JP715
325 -370 VDC
MUZ-FH50
OBH624A
38
K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TEMP 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 figure 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
Is LEV coil properly fixed to
the expansion valve?
No
Yes
Does the resistance of LEV
coil have the characteristics? Yes
(Refer to 11-4.)
No
Replace the LEV coil.
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Yes
OK
Properly fix 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 it ON again.
2. Press RESET button on the remote controller.
OBH624A
39
No
Replace the inverter P.C.
board.
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 11-5. .)
Is the fuse (F901) blown on the inverter P.C. board?
Yes
No
Check the connection of the connectors
(CN931, CN932) of the outdoor fan motor.
If the connection is poor, make it correct.
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the LED indication on the inverter P.C. board.
Does the LED flash 10 times?
Yes
(10-time flash)
No
Check the corresponding parts
following LED indication.
(Refer to 11-3.)
Replace the inverter P.C. board.
OBH624A
40
M How to check miswiring and serial signal error
MUZ-FH25/35
Turn the power supply OFF.
Is there rated voltage in the power supply?
Yes
Check the power supply.
No
Check for incorrect indoor-outdoor connecting wiring.
Was the indoor unit ever connected to
the Multi (MXZ) series and operated
(turned on)?
Yes
No
The connection information to the Multi series is stored
in the indoor unit. Refer to “Deleting the memorized
abnormal condition” described in 11-2.1 to clear the error
history. When the error history is being cleared, the connection information also will be initialized. The indoor unit
will be compatible with a low-standby-power model after
initialization.
OK
A
B Turn the power supply ON.
Check for miswiring, broken wires, and loose
wire connection between the power supply
and outdoor terminal block S1 and between
the power supply and outdoor terminal block
S2.
No
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Wait for 2 or more minutes after the power supply is turned on.
Touch S2 and S3 with tester probes and start the emergency operation.
When the emergency operation starts, does the rated voltage occur for 2
seconds between indoor terminal block S2 and S3?
No
Yes
Does the indoor POWER lamp
blink continuously 6 minutes after
the emergency operation starts?
Turn the power supply OFF.
No
Does the outdoor LED light up?
No
Turn the power supply ON.
Yes
Yes
Does the outdoor LED blink 6
times?
Confirm that the thermostat is OFF
and wiring is not loose.
No
Wait for 2 or more minutes after the power supply
is turned ON. Touch CN202 and JPG with tester
probes and start the emergency operation.
Replace the outdoor inverter P.C. board. 1
Yes
Does DC (6V or more) occur
between indoor terminal block S2
and S3?
Yes
No
Replace the outdoor inverter P.C. board. 1
During the emergency operation,
does DC (2V or more) occur for 2
seconds between CN202 and
JPG on the indoor electronic control
P.C. board?
No
Yes
Replace the
indoor power P.C.
board.
1.
Electric charge may remain immediately
after the power supply is turned OFF.
Perform the procedure after 3 minutes.
Turn the power supply OFF.
Replace the indoor power P.C.
board.
Replace the
indoor electronic
control P.C. board.
Turn the power supply ON.
Start the emergency operation.
A
Does the indoor POWER lamp
blink continuously 6 minutes after
the emergency operation starts?
No
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press EMERGENCY OPERATION switch.
Repair completed.
Yes
Does DC (20V or more) occur
between indoor terminal block S2
and S3 ?
Yes
No
Is serial signal
error indicated 6
minutes later?
Yes
Replace the outdoor
inverter P.C. board. 1
B
Replace the indoor electronic
control P.C. board.
OBH624A
41
No
• Reinstall either the unit or the light
away from each other.
• Attach a filter on remote control
receiving section of the indoor unit.
MUZ-FH50
Turn the power supply OFF.
NOTE: Refer to the indoor unit service manual.
Check the power supply.
Is there rated voltage in the power supply?
No
Yes
Check for incorrect indoor-outdoor connecting wiring.
Yes
A
Was the indoor unit ever connected to the Multi
(MXZ) series and operated (turned on)?
• Turn OFF inverter-controlled lighting equipment.
• Turn OFF the power supply and then turn ON again.
• Press EMERGENCY OPERATION switch.
No
The connection information to the Multi series is
stored in the indoor unit. Refer to “Deleting the
memorized abnormal condition” described in 11-2.1
to clear the error history. When the error history is
being cleared, the connection information also will
be initialized. The indoor unit will be compatible with
a low-standby-power model after initialization.
OK
Is serial signal
error indicated 6
minutes later?
Yes
A
B
B
Turn the power supply ON.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Wait for 2 or more minutes after the power supply is turned on.
Touch S2 and S3 with tester probes and start the emergency operation.
When the emergency operation starts, does the rated voltage occur for 2 seconds between indoor terminal block S2 and S3?
Yes
Does the indoor POWER lamp
blink continuously 6 minutes after
the emergency operation starts?
No
Does DC (10 V or more) occur
between L68A and L68B on the
relay P.C. board?
No
Replace the relay P.C. board. 1
Does the outdoor LED blink 6
times?
No
Replace the inverter P.C. board
and the relay P.C. board. 1
Yes
Does DC (more than 0 V) occur
between indoor terminal block S2
and S3?
Yes
No
Replace the inverter P.C. board. 1
1.
Electric charge may remain immediately
after the power supply is turned OFF.
Perform the procedure after 3 minutes.
Turn the power supply OFF.
Replace the indoor electronic
control P.C. board.
Turn the power supply ON.
Start the emergency operation.
Does the indoor POWER lamp
blink continuously 6 minutes after
the emergency operation starts?
No
Repair has been completed.
Yes
Replace the inverter P.C. board
and the relay P.C. board. 1
OBH624A
42
No
Check for miswiring, broken wires, and loose wire
connection between the power supply and outdoor
terminal block S1 and between the power supply and
outdoor terminal block S2.
No
Yes
Yes
No
• Reinstall either the unit or the light
away from each other.
• Attach a filter on remote control
receiving section of the indoor unit.
Replace the inverter P.C. board
and the relay P.C. board. 1
Replace the indoor electronic
control P.C. board.
N Electromagnetic noise enters into TV sets or radios
Is the unit earthed?
Yes
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
Earth the unit.
No
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
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 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
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific 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 field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier 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.
OBH624A
43
11-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-FH25VE
MUZ-FH35VE
Smoothing
capacitor
(C62)
DB61
260 - 370 VDC
(-)
(+)
Back side of unit
Smoothing
capacitor
(C61)
R.V.coil
(CN721)
230 VAC
Fuse (F701)
T3.15AL250V
Fuse (F801)
T3.15AL250V
230 VAC
Fuse (F901)
T3.15AL250V
Output to
drive outdoor
fan motor
(CN932)
230 VAC
Output to
drive
compressor
(LDU,
LDV,
LDW)
100
Jumper wire for
changing defrost
setting (JS)
LEV connector
(CN724)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
Discharge temperature
thermistor/RT62
(CN641)
Defrost thermistor
/RT61(CN641)
Ambient temperature
thermistor/RT65
(CN643)
Signal of outdoor
fan motor (CN931)
Front side of unit
Fin temperature
thermistor/RT64
(CN642)
LED
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
80
160
Discharge temperature thermistor(RT62)
700
60
600
50
40
30
20
10
-10
0
10 20 30
Temperature( )
OBH624A
40
140
Resistance(k )
70
Resistance(k )
Resistance(k )
Fin temperature thermistor(RT64)
180
90
0
-20
Jumper wire
for pre-heat
control setting
(JK)
500
400
300
120
100
80
60
200
40
100
20
0
0
10
20
30
40
50
60
70
80
Temperature( )
44
90 100 110 120
0
0
10 20 30 40 50 60 70 80
Temperature( )
MUZ-FH50VE
Fuse (F601)
T3.15AL250V
R.V. coil (CN602)
230VAC
Heater (CN601)
230VAC
Signal of outdoor fan motor
(CN931)
LEV connector (CN724)
Output to
drive outdoor
fan motor
(CN932)
LED
Defrost thermistor
/RT61 (CN671)
Discharge temperature
thermistor/RT62
(CN671)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN671)
Ambient temperature
thermistor/RT65
(CN672)
Fin temperature
thermistor/RT64
(CN673)
Jumper wire for
changing defrost
setting (JS)
Fuse (F901)
T3.15AL250V
Fuse (F880)
T3.15AL250V
Jumper wire for
pre-heat control
setting (JK)
JP715 (+)
325 - 370 VDC
JP30 (-)
100
To relay P.C. board CN680
(CN681)
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
180
90
60
600
50
40
30
20
10
0
10 20 30
Temperature( )
OBH624A
40
140
500
400
300
120
100
80
60
200
40
100
20
0
-10
160
Discharge temperature thermistor(RT62)
Resistance(k )
70
700
Resistance(k )
Resistance(k )
80
0
-20
Fin temperature thermistor(RT64)
0
10
20
30
40
50
60
70
80
Temperature( )
45
90 100 110 120
0
0
10 20 30 40 50 60 70 80
Temperature( )
2. Relay P.C. board
MUZ-FH50VE
CN60
To inverter P.C. board
CN681 (CN680)
L68B(-)
10 VDC
L68A(+)
OBH624A
46
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.
Sleeve
Locking lever
(2) The terminal with this connector has the
locking mechanism.
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
12-1. MUZ-FH25VE
MUZ-FH35VE
NOTE: Turn OFF power supply before disassembly.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(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 screws fixing the back panel.
(9) Remove the back panel.
Screws of the
top panel
Screws of
the top panel
Back
panel
Screw
of the
back
panel
Screws of
the cabinet
Photo 2
Screw of the
cabinet
Service
panel
Screws of
the terminal block
support and the
back panel
Screw of the
service panel
Direction to
remove
Screws of
the cabinet
OBH624A
47
Hooks
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger 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 fixing screws of the terminal block support and
the back panel.
(6) Remove the inverter assembly.
(7) Remove the screw of the earth wire and screw of the terminal block support.
(8) Remove the heat sink support from the P.C. board support.
(9) Remove the screw of the inverter P.C. board and remove the
inverter P.C. board from the P.C. board support.
Photo 3
Screws of the heat sink
support and the separator
Ambient temperature
thermistor
Screws of the terminal block
support and the back panel
Photo 4 (Inverter assembly)
Heat sink Heat sink support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil.
P.C. board
support
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and 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)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(4) Pull out the defrost thermistor from its holder. (Photo 6)
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (Photo 6)
(6) Pull out the ambient temperature thermistor from its holder.
Screw of the
Terminal block
support
Terminal
block
support
Screw of the
Screw of the
inverter P.C. board earth wire
Photo 5
Screw of the
R.V. coil
Discharge temperature thermistor
OBH624A
48
OPERATING PROCEDURE
PHOTOS
5. Removing outdoor fan motor
Photo 6
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931, CN932 (Fan motor)
(3) Remove the propeller nut.
(4) Remove the propeller.
(5) Remove the screws fixing the fan motor.
(6) Remove the fan motor.
Outdoor heat
exchanger temperature thermistor
6. Removing the compressor and 4-way valve
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Remove the inverter assembly. (Refer to 2.)
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0 MPa).
(4) Detach the brazed part of the suction and the discharge pipe
connected with compressor.
(5) Remove the nuts of compressor legs.
(6) Remove the compressor.
(7) Detach the brazed part of pipes connected with 4-way valve.
Photo 8
Photo 7
Suction pipe
Discharge pipe brazed part
brazed part
Screws of the outdoor fan motor
Propeller
Brazed parts of 4-way valve
OBH624A
Defrost thermistor
49
Propeller nut
12-2. MUZ-FH50VE
NOTE: Turn OFF power supply before disassembly.
OPERATING PROCEDURE
PHOTOS
Photo 1
1. Removing the cabinet
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Remove the screws of the service panel.
Remove the screws of the top panel.
Remove the screw of the valve cover.
Remove the service panel.
Remove the top panel.
Remove the valve cover.
Disconnect the power supply and indoor/outdoor connecting wire.
(8) Remove the screws of the cabinet.
(9) Remove the cabinet.
(10) Remove the screws of the back panel.
(11) Remove the back panel.
Screws of the top panel
Photo 2
Screw of the back panel
Screws of the top panel
Screws of the
cabinet
Screws of the
cabinet
Screws
of the
cabinet
Screw of the Screws of the
valve cover service panel
OBH624A
Screws of the
back panel
50
Screws of the
cabinet
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
and relay P.C. board
Photo 3
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following conInverter P.C.
nectors:
board
<Inverter P.C. board>
CN602 (R.V. coil)
CN931, CN932 (Fan motor)
CN671 (Defrost thermistor, discharge temperature thermistor
and outdoor heat exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector.
(4) Remove the screws fixing the relay panel.
(5) Remove the relay panel.
(6) Remove the earth wires and the lead wires of the inverter P.C.
board.
(7) Remove the screws of the P.B. support.
Screws of
(8) Remove the inverter P.C. board from the relay panel.
the P.B.
(9) Disconnect the following connectors:
support
<Relay P.C. board>
CN60 (Terminal block)
CN680 (Inverter P.C. board)
TAB65 (Inverter P.C. board)
TB71
(10) Remove the screws fixing the P.B. holder.
Screw of the
(11) Remove the relay P.C. board from the P.B. holder.
relay panel
Earth wires
Screws of the
relay panel
Screw of
Screws of Relay
the P.B.
P.C board the P.B.
holder
support
Photo 4
Screw of the
R.V. coil
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connector:
<Inverter P.C. board>
CN602 (R.V. coil)
(3) Remove the R.V. coil.
Brazed parts of
4-way valve
OBH624A
51
OPERATING PROCEDURE
PHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN671 (Defrost thermistor, discharge temperature thermistor and outdoor heart exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder. (Photo 7)
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
Photo 5
Outdoor heat
exchanger
temperature thermistor
Ambient
temperature
thermistor
5. Removing outdoor fan motor
(1) Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
Defrost thermistor
Photo 6
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
6. Removing the compressor and 4-way valve
Photo 7
(1) Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0 MPa).
(5) Detach the brazed part of the suction and the discharge
pipe connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the brazed parts of 4-way valve and pipe. (Photo 4)
Brazed part of the
suction pipe
OBH624A
52
Screws of the
outdoor fan motor
Brazed part of the
discharge pipe
Discharge temperature
thermistor
OBH624A
53
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2012 MITSUBISHI ELECTRIC CORPORATION
Distributed in Mar. 2013. No. OBH624 REVISED EDITION-A
Distributed in Oct. 2012. No. OBH624
Made in Japan
New publication, effective Mar. 2013
Specifications are subject to change without notice.