Mitsubishi | SEZ-KD71VAQ | Service manual | Mitsubishi SEZ-KD71VAQ Service manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
September 2011
No.OCH472
REVISED EDITION-A
HFC
utilized
TECHNICAL & SERVICE MANUAL
R410A
R410A
Outdoor unit
[Model names]
SUZ-KA25VA2
SUZ-KA35VA2
SUZ-KA50VA2
SUZ-KA60VA2
SUZ-KA71VA2
Revision:
• Errors in "11.
TROUBLESHOOTING"
have been corrected in
REVISED EDITION-A.
[Service Ref.]
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
SUZ-KA71VA2.TH
• Some descriptions have
been modified.
• Please void OCH472.
CONTENTS
Indication of
model name
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
NOTE:
This service manual describes technical data of the
outdoor units.
RoHS compliant products have <G> mark on the spec
name plate.
For servicing of RoHS compliant products, refer to the
RoHS Parts List.
1. COMBINATION OF INDOOR AND OUTDOOR UNITS.......2
2. TECHNICAL CHANGES ....................................3
3. PART NAMES AND FUNCTIONS......................6
4. SPECIFICATION................................................. 7
5. NOISE CRITERIA CURVES............................... 9
6. OUTLINES AND DIMENSIONS........................10
7. WIRING DIAGRAM...........................................13
8. REFRIGERANT SYSTEM DIAGRAM.............. 17
9. ACTUATOR CONTROL....................................21
10. SERVICE FUNCTIONS.....................................22
11. TROUBLESHOOTING...................................... 22
12. DISASSEMBLY INSTRUCTIONS..................... 63
PARTS CATALOG (OCB472)
1
COMBINATION OF INDOOR AND OUTDOOR UNITS
1-1. INDOOR UNIT SERVICE MANUAL
Outdoor unit
Heat pump type
Indoor unit
SUZService Ref.
Service
Manual No.
KA25VA2.TH KA35VA2.TH KA50VA2.TH KA60VA2.TH KA71VA2.TH
—
SLZ-KA25VA(L).TH
SLZ-KA35VA(L).TH
OC320
—
—
Heat pump without electric heater
SLZ-KA25VAQ.TH
SLZ-KA35VAQ.TH
OCH493
—
—
SEZ-KD25VA(L).TH
—
SEZ-KD35VA(L).TH
HWE0711
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SLZ-KA50VAQ.TH
—
—
—
SLZ-KA50VA(L).TH
—
—
—
SEZ-KD60VA(L).TH
—
—
—
SEZ-KD71VA(L).TH
—
—
—
—
—
—
—
—
—
—
—
—
—
SEZ-KD50VA(L).TH
SEZ-KD25VAQ.TH
—
SEZ-KD35VAQ.TH
HWE1008
—
—
—
SEZ-KD60VAQ.TH
—
—
—
SEZ-KD71VAQ.TH
—
—
—
—
—
—
—
—
—
—
—
—
—
SEZ-KD50VAQ.TH
MFZ-KA25VA-E4
MFZ-KA35VA-E4
MFZ-KA50VA-E4
OB409
—
—
—
—
(NOTE) Please refer to the service manual of indoor unit or the technical data book for the combination data.
OCH472A
2
2
TECHNICAL CHANGES
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
oil
Refrigerant
Refrigerant
• This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners.
1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point ()
Steam pressure [25](Mpa)
Saturated steam density [25](Kg/*)
Combustibility
ODP +1
GWP +2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
+1: Ozone Depletion Potential
+2: Global Warming Potential
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
None
None
: based on CFC-11
: based on CO2
New Specification
Compressor
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
None
Current Specification
The incompatible refrigerant oil easily separates from
Since refrigerant and refrigerant oil are compatible with
refrigerant and is in the upper layer inside the suction muffler. each other, refrigerant oil backs to the compressor through
Raising position of the oil back hole enables to back the
the lower position oil back hole.
refrigerant oil of the upper layer to flow back to the
compressor.
Suction muffler
Suction muffler
Compressor
Oil back hole
Compressor
Refrigerant oil
Refrigerant
Oil back hole
Refrigerant oil /Refrigerant
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])
OCH472A
3
Conversion chart of refrigerant temperature and pressure
(MPa [Gauge])
4.0
Saturated liquid pressure
3.5
R410A
3.0
R22
2.5
2.0
NOTE: The unit of pressure has been changed to MPa on the
international system of units (SI unit system).
1.5
1.0
The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2 [Gauge])
0.5
0.0
-0.5
-30 -20 -10
0
10
20
30
40
50
60
()
1. Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
R410A tools
Description
Can R22 tools be used?
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
from being charged into the unit.
Gauge manifold
No
Charge hose
No
Gas leak detector
No
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
Yes
6.35 mm and 9.52 mm
No
12.7 mm and 15.88 mm
Flare tool
Yes
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
New
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
Torque wrench
New
New
No: Not substitutable for R410A
OCH472A
Yes: Substitutable for R410A
4
2. Refrigerant piping
1 Specifications
Use the refrigerant pipes that meet the following specifications.
Outside diameter
mm
6.35
9.52
9.52
12.7
15.88
Pipe
For liquid
For gas
Wall thickness
mm
0.8
0.8
0.8
0.8
1.0
Insulation material
Heat resisting foam plastic
Specific gravity 0.045 Thickness
8 mm
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
2 Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
Dimension of flare nut (mm)
Pipe diameter (mm)
R410A
6.35
9.52
12.7
15.88
R22
17
22
24
27
17
22
26
29
3. Refrigerant oil
Apply the special refrigerant oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4. Air purge
Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
Use the vacuum pump for air purging for the purpose of environmental protection.
5. Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the
outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
Union
Stop valve
Indoor unit
Liquid pipe
Gas pipe
Refrigerant gas
cylinder
operating valve
Outdoor unit
Service port
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
OCH472A
5
3
PART NAMES AND FUNCTIONS
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
SUZ-KA50VA2.TH SUZ-KA60VA2.TH
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
SUZ-KA71VA2.TH
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
Model
Drain socket
Drain cap
OCH472A
SUZ-KA25/35VA2.TH
1
-
SUZ-KA50/60VA2.TH
1
2
6
SUZ-KA71VA2.TH
1
-
4
SPECIFICATION
Outdoor Service Ref.
Electrical
Compressor data
Fan
motor
SUZ-KA35VA2.TH
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
Cooling Heating
Single phase
230V, 50Hz
6.75
6.45
6.05
0.30
SNB130FGBH(T)
900
U-V 0.98 U-W 0.98
V-W 0.98
RC0J60-AA
WHT-BLK 15.2
BLK-RED 15.2
RED-WHT 15.2
Cooling Heating
Single phase
230V, 50Hz
9.75
8.05
9.45
0.30
SNB130FGBH(T)
900
U-V 0.98 U-W 0.98
V-W 0.98
RC0J60-AA
WHT-BLK 15.2
BLK-RED 15.2
RED-WHT 15.2
SUZ-KA71VA2.TH
Cooling Heating
Single phase
Power supply
230V, 50Hz
8.89
Starting current *1
8.00
8.07
Compressor motor current *1
0.83
0.82
Fan motor current *1
SNB172FEKMT
Model
1200
Output
U-V 1.04 U-W 1.04
Winding
V-W 1.04
resistance (at 20)
RC0J60-BC
Model
WHT-BLK 15.0
Winding
BLK-RED 15.0
resistance(at 20)
RED-WHT 15.0
3,.425/3,006 2,892/2,892
*/h 2,058 1,938
2,940/1,650+ 2,940/2,210+ 2,940/1,650+ 2,940/2,210+
Air flow(High/Low+)
2,004
/2,280+
/1,512+
800%550%285
840%850%330
840%850%330
840%880%330
mm 800%550%285
Dimensions WHD
33
53
53
53
kg
30
Weight
47
55+
53/51+ 55/53+ 53/51+ 55/53+
55+
48
dB
46
Sound level *1
Fan speed(High+/Low+, High+/Med+/Low+) rpm 810+/650+ 880+/810+/650+ 840+/760+ 880+/800+/630+ 840/480+ 800/620+ 840/480+ 800/620+ 950/840/450+ 810/810/650+
2
2
3
2
Fan speed regulator
2
3
3
Refrigerant filling
1.60
1.80
1.80
1.05
kg
0.80
capacity(R410A)
450 (NEO22)
450 (NEO22)
400 (FV50S)
320 (NEO22)
320 (NEO22)
Refrigerating oil (Model) cc
Function
Special
remarks
SUZ-KA25VA2.TH
Cooling Heating
Single phase
230V, 50Hz
3.65
A
2.74
3.37
A
0.31
0.28
A
KNB073FFDH(C)
550
W
U-V 1.70 U-W 1.70
V-W 1.70
RC0J50-DB
WHT-BLK 37.0
BLK-RED 37.0
RED-WHT 37.0
Cooling Heating
Single phase
230V, 50Hz
4.75
4.22
4.42
0.33
0.33
KNB092FFAH(C)
650
U-V 1.91 U-W 1.91
V-W 1.91
RC0J50-DB
WHT-BLK 37.0
BLK-RED 37.0
RED-WHT 37.0
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27: W.B. 19:
Outdoor D.B. 35: W.B. 24:
Heating : Indoor D.B. 20: W.B. 15:
Outdoor D.B. 7: W.B. 6:
Refrigerant piping length (one way): 5m
*1 Measured under rated operating frequency.
w Reference value
OCH472A
7
Specifications and rating conditions of main electric parts
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
SUZ-KA50VA2.TH SUZ-KA60VA2.TH
SUZ-KA71VA2.TH
Item
Current
transformer
Smoothing
capacitor
Diode module
Fuse
Inteligent power
module
Model SUZ-KA25VA2. SUZ0KA35VA2. SUZ-KA50VA2. SUZ-KA60VA2. SUZ-KA71VA2.
TH
TH
TH
TH
TH
(CT)
20A
(CT1, 2)
ETQ19Z68AY
(CT61)
ETQ19Z53AY
(CT761, CT781)
15A
620+ 420V
(C61)
(C62, C63)
620+ 420V
(CB1, 2, 3)
560μF 450V
560μF 350V
(DB61)
15A 600V
25A 600V
(DB65)
25A 600V
(F61)
T20A L250V
(F62)
T20A L250V
(F63)
(F64)
250V 2A
(F701, F801, F901)
T3.15A L250V
(F911)
250V 1A
(IPM)
15A 600V
20A 600V
15A 600V
20A 600V
(HC930)
3A 450V
(IC932)
5A 600V
Power factor
controller
Expansion valve
coil
High pressure
switch
(LEV)
Reactor
-
(L61)
(L)
23mH
100mΩ 5W
(2 elements)
Resistor
Current-Limiting
PTC thermistoe
Terminal block
(R61, R62)
(R64A, R64B)
(R825)
(R937, R938, R939)
(R937A, R937B)
(RS1~4)
Relay
Solenoid coil relay
R.V. coil
IGBT
OCH472A
(PTC64, PTC65)
(TB1, TB2)
(X63)
(X64)
(X601)
(X602)
(SSR61)
(21S4)
(TR821)
PS51259-A
20A 600V
ACB-DB156
(for R2)
-
DC12V
(HPS)
(R61)
Current-detecting
resistor
-
(PFC)
45mΩ 5W
(1 element)
340μH 20A
340μH
180mΩ 5W
(2 elements)
25mΩ 5W
430mΩ 2W
-
10Ω 10W
-
1.1Ω 2W
33Ω
1.1Ω 2W 2%
0.04Ω 7W
-
-
33Ω
3P
3A 250V
20A 250V
20A 250V
TLP3506
20A 250V
3A 250V
3A 250V
-
-
-
AC220-240V
30A 600V
8
5
NOISE CRITERIA CURVES
SUZ-KA35VA2.TH
SUZ-KA25VA2.TH
FAN SPEED FUNCTION
46
HEATING
46
FAN SPEED FUNCTION
High
Med.
SPL(dB(A))
COOLING
47
HEATING
48
LINE
Test conditions,
Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)
Heating : Dry-bulb temperature 7Wet-bulb temperature 6
90
Test conditions,
Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)
Heating : Dry-bulb temperature 7Wet-bulb temperature 6
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
COOLING
LINE
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
High
Med.
SPL(dB(A))
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
NC-20
250
500
1000
2000
4000
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
10
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
BAND CENTER FREQUENCIES, Hz
High
SPL(dB(A))
COOLING
53
HEATING
55
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
10
63
125
NC-20
250
500
1000
2000
4000
2000
8000
SPL(dB(A))
COOLING
55
HEATING
55
LINE
8000
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
10
63
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C
Wet-bulb temperature 6°C
OUTDOOR UNIT
1m
MICROPHONE
OCH472A
4000
Test conditions,
Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)
Heating : Dry-bulb temperature 7Wet-bulb temperature 6
90
80
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
1000
FAN SPEED FUNCTION
LINE
High
70
500
SUZ-KA71VA2.TH
Test conditions,
Cooling : Dry-bulb temperature 35Wet-bulb temperature (24)
Heating : Dry-bulb temperature 7Wet-bulb temperature 6
90
20
250
BAND CENTER FREQUENCIES, Hz
SUZ-KA50VA2.TH SUZ-KA60VA2.TH
FAN SPEED FUNCTION
NC-20
9
6
OUTLINES AND DIMENSIONS
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
Unit: mm
REQUIRED SPACE
Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
Bolt pitch for
installation
304~325
44
Air in
40
2-Oval holes 10×21
Open two sides of left,
right, or rear side.
Air out
22.3
ore
or m
mm
0
0
2
17.5
Service panel
23
Liquid refrigerant pipe joint
Refrigerant pipe (flared) :6.35
Handle
35
69
302.5
Gas refrigerant pipe joint
Refrigerant pipe (flared) :9.52
99.5
10
164.5
280
150
170.5
Service port
500 Bolt pitch for installation
800
OCH472A
43
285
100
mm
or m
ore
Drain hole :42
550
344.5
400
Air in
10
re
r mo
mo
m
100
350
mm
or m
ore
SUZ-KA50VA2.TH SUZ-KA60VA2.TH
Unit: mm
REQUIRED SPACE
Open as a rule
500mm or more if
the front and both
sides are open
Drain holes :33
515
299
40
51
34
66
100mm or more
200mm or more if
there are obstacles
to both sides
Air in
Bolt pitch for
installation
360
330
100mm or more
Air in
4-Oval holes 10×21
Air out 500
840
121
81
Open as a rule
500mm or more if the back,
both sides and top are open
350mm or more
Service panel
155
90
198
OCH472A
11
30
35
430
850
Liquid refrigerant
pipe joint
Refrigerant pipe(flared)
:6.35
Gas refrigerant
pipe joint
Refrigerant pipe(flared)
:12.7·····(SUZ-KA50VA2.TH)
:15.88···(SUZ-KA60VA2.TH)
SUZ-KA71VA2.TH
Unit: mm
Open as a rule
500mm or more if
the front and both
sides are open
REQUIRED SPACE
417.5
Drain hole
40
50
Bolt pitch for
installation
360
42
Air in
100mm or more
200mm or more if
there are obstacles
to both sides
100
mm
or m
ore
Air out
2-Oval holes 10 21
350
500
175
840
Open as a rule
500mm or more if the back,
both sides and top are open
81
109
mm
or m
ore
Service panel
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) Ø 9.52
880
35
164.5
99.5
44
452
330
Air in
195
OCH472A
12
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) Ø 15.88
NOTES:1. About the indoor side electric wiring, refer to
the indoor unit electric wiring diagram for
servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
: Terminal block
7
WIRING DIAGRAM
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
OCH472A
13
3~
MC U
BLK
WHT
RED
1
3
SYMBOL
CT
C61,62,63
DB61,DB65
DSA
F61
F701,F801,F901
HC930,IPM
IC802
L61
L62
W
MS V
RED
LDW
LDV
LDU
U
V
P
N
IPM
W
R825
TR821
1
R61
14
3
MF
MS
3~
CN932
5
3
5
F901
F801
R937A
1
T801
1
RT64
2 1
CN642
HC930
R937B
IC802
RT68
CN644
RT65
RT61 RT62
CN641
4 1
LEV
M
6
CN724
6
CT
LD61
U
F701
LD63
BRN
U
1
CN721
LD-E1
2
F61
LD62
U
LD-S
L62 DSA
PTC65
PTC64
X64
X63
21S4
BRN
BLU
RED
GRN/YLW
BLK
S1
S3
S2
TB2
L
N
TB1
230V~
12-24V
CIRCUIT
BREAKER
POWER SUPPLY
~/N 230V 50Hz
NOTES: 1. About the indoor side electric wiring,
NAME
refer to the indoor unit electric wiring
CURRENT-DETECTING RESISTOR
diagram for servicing.
CURRENT-DETECTING RESISTOR
CURRENT-DETECTING RESISTOR
2. Use copper conductors only (for field wiring).
TERMINAL BLOCK
3. Symbols below indicate.
SWITCHING POWER TRANSISTOR
:Terminal block
TRANSFORMER
RELAY
REVERSING VALVE COIL
2 1
SYMBOL
R61
R825
R937A, B
TB1,TB52
TR821
T801
X63,X64
21S4
3 1
CN643
INVERTER P.C. BOARD
YLW
NAME
EXPANSION VALVE COIL
COMPRESSOR
FAN MOTOR
CIRCUIT PROTECTION
DEFROST THERMISTOR
DISCHARGE TEMP. THERMISTOR
FIN TEMP. THERMISTOR
AMBIENT TEMP. THERMISTOR
RT68 OUTDOOR HEAT EXCHANGER
TEMP. THERMISTOR
SYMBOL
LEV
MC
MF
PTC64,PTC65
RT61
RT62
RT64
RT65
CN931
C63 C62 C61
LD66
NAME
CURRENT TRANSFORMER
SMOOTHING CAPACITOR
DIODE MODULE
SURGE ABSORBER
FUSE (T20AL 250V)
FUSE (T3.15AL 250V)
INTELLIGENT POWER MODULE
INTELLIGENT POWER DEVICE
REACTOR
REACTOR
BLK
WHT
1
3
DB65
DB61
LD70
L61
BLU
BRN
OCH472A
TO INDOOR
UNIT
CONNECTING
ORN
SUZ-KA50VA2.TH
SYMBOL
CB1~3
CT1, 2
CT61
F64
F801
F911
HC930
HPS
IPM
L
NAME
SMOOTHING CAPACITOR
CURRENT TRANSFORMER
CURRENT TRANSFORMER
FUSE (T2AL 250V)
FUSE (T3.15AL 250V)
FUSE (T1AL 250V)
INTELLIGENT POWER MODULE
HIGH PRESSURE SWITCH
INTELLIGENT POWER MODULE
REACTOR
SYMBOL
LEV
MC
MF
NF
NR64
PFC
RS1~4
RT61
RT62
RT64
NAME
EXPANSION VALVE
COMPRESSOR
FAN MOTOR
NOISE FILTER
VARISTOR
POWER FACTOR CONTROLLER
RESISTOR
DEFROST THERMISTOR
DISCHARGE TEMP. THERMISTOR
FIN TEMP. THERMISTOR
SYMBOL
RT65
RT68
R64A,B
R937A, B
SSR61
TB1
TB2
T801
X64
21S4
NOTES: 1. About the indoor side electric wiring
NAME
refer to the indoor unit electric wiring
AMBIENT TEMP. THERMISTOR
diagram for servicing.
OUTDOOR HEAT EXCHANGER TEMP. THERMISTOR
RESISTOR
2. Use copper conductors only (for field wiring).
RESISTOR
3. Symbols below indicate.
SOLENOID COIL RELAY
:Terminal block
TERMINAL BLOCK
TERMINAL BLOCK
TRANSFORMER
RELAY
REVERSING VALVE COIL
SUZ-KA60VA2.TH
OCH472A
15
SUZ-KA71VA2.TH
OCH472A
16
8
REFRIGERANT SYSTEM DIAGRAM
SUZ-KA25VA2.TH
Unit: mm
Refrigerant pipe ø9.52
(with heat insulator)
4-way valve
Muffler
Stop valve
(with service port)
Discharge
temperature
thermistor
RT62
Flared connection
Outdoor
heat
exchanger
Muffler
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Compressor
Defrost
thermistor
RT61
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Strainer
#100
LEV
Capillary tube
ø3.0×ø2.0×240
R.V. coil
heating ON
cooling OFF
Stop valve
(with strainer)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: mm
SUZ-KA35VA2.TH
Refrigerant pipe ø9.52
(with heat insulator)
4-way valve
Muffler
Stop valve
(with service port)
Discharge
temperature
thermistor
RT62
Flared connection
Outdoor
heat
exchanger
Muffler
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Compressor
Defrost
thermistor
RT61
Capillary tube
ø3.0×ø1.8×600(×2)
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
OCH472A
Strainer
#100
Capillary tube
ø3.0×ø2.0×240
LEV
Stop valve
(with strainer)
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
17
SUZ-KA50VA2.TH
Unit: mm
Muffler
4-way valve #100
Refrigerant pipe ø12.7
(with heat insulator)
Stop valve
(with service port)
Flared connection
Discharge
temperature
thermistor
RT62
Defrost
thermistor
RT61
Outdoor
heat
exchanger
Ambient
temperature
thermistor
RT65
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
LEV
Receiver
Refrigerant pipe ø6.35
(with heat insulator)
Stop valve
(with strainer)
Strainer
#100
R.V. coil
heating ON
cooling OFF
Capillary tube
ø3.6×ø2.4×50
Refrigerant flow in cooling
Refrigerant flow in heating
SUZ-KA60VA2.TH
Refrigerant pipe :15.88
(with heat insulator)
Unit: mm
Muffler
4-way valve #100
Stop valve
(with service port)
Flared connection
Discharge
temperature
thermistor
RT62
High-pressure
switch
Defrost
thermistor
RT61
Outdoor
heat
exchanger
Ambient
temperature
thermistor
RT65
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
Strainer
Receiver #100
Stop valve
Refrigerant pipe :6.35
(with heat insulator)
OCH472A
LEV
Capillary tube
:3.6:2.450
18
Strainer
#100
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
SUZ-KA71VA2.TH
Unit: mm
Refrigerant pipe ø15.88
(with heat insulator)
Muffler
4-way valve #100
Stop valve
(with service port)
Flared connection
Discharge
temperature
thermistor
RT62
Defrost
thermistor
RT61
Outdoor
heat
exchanger
Ambient
temperature
thermistor
RT65
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
LEV
Strainer
#100
Stop valve
Refrigerant pipe ø9.52
(with heat insulator)
OCH472A
Capillary tube
ø4.0×ø2.4×100
19
Strainer
#100
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
SUZ-KA25VA2.TH
SUZ-KA60VA2.TH
SUZ-KA35VA2.TH
SUZ-KA71VA2.TH
SUZ-KA50VA2.TH
MAX. REFRIGERANT PIPING LENGTH
Refrigerant piping: m
Max. Height difference B
Max. Length A
Models
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
SUZ-KA71VA2.TH
20
12
Gas
Piping size O.D: mm
Liquid
9.52
6.35
12.7
30
30(15)
15.88
9.52
( ): MFZ-KA50VA-E4
MAX. HEIGHT DIFFERENCE
Indoor
unit
+ Max. Height
difference
B
Max. Length
A
Outdoor unit
+ Height difference limitations are binding regardless of which unit, indoor or outdoor, is position high.
ADDITIONAL REFRIGERANT CHARGE (R410A: g)
Models
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
Outdoor unit
precharged
800
1,050
5m
0
0
6m
0
0
7m
0
0
Refrigerant piping length (one way)
8m
9m 10m 11m 12m 13m
90
120 150 180 210 240
90
120 150 180 210 240
14m
270
270
15m
300
300
20m
450
450
Calculation: Xg=30g/mo(Refrigerant piping length(m)-5)
Models
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
Outdoor unit
precharged
1,600
1,800
7m
0
0
10m
60
60
Refrigerant piping length (one way)
15m
20m
25m
160
260
360
160
260
360
30m
460
460
Calculation : Xg=20g/m o (Refrigerant piping length(m)–7)
Models
SUZ-KA71VA2.TH
Outdoor unit
precharged
1,800
7m
0
10m
165
Refrigerant piping length (one way)
15m
20m
25m
440
715
990
30m
1,265
Calculation : Xg=55g/m o (Refrigerant piping length(m)-7)
OCH472A
20
9
ACTUATOR CONTROL
SUZ-KA25VA2.TH
SUZ-KA60VA2.TH
SUZ-KA35VA2.TH
SUZ-KA71VA2.TH
SUZ-KA50VA2.TH
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
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
Purpose
Compressor
Discharge temperature
thermistor
Protection
Indoor coil temperature
thermistor
Cooling: Coil frost prevention
Heating: High pressure protection
Defrost thermistor
Heating: Defrosting
Fin temperature thermistor
Ambient temperature
thermistor
Protection
Outdoor heat exchanger temperature thermistor
Cooling: Low ambient temperature operation
Cooling: High pressure protection
OCH472A
Cooling: Low ambient temperature operation
21
○
○
○
○
○
○
○
○
Actuator
Outdoor fan
LEV
motor
R.V.coil
○
○
○
○
○
○
○
○
○
○
○
○
10
SERVICE FUNCTIONS
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
CHANGE IN DEFROST SETTING
<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.
(Refer to 11-6-1)
Jumper wire
JS
11
soldered
(Initial setting)
none
(cut)
Defrost finish temperature
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
5:
10:
8:
13:
TROUBLESHOOTING
SUZ-KA25VA2.TH
SUZ-KA50VA2.TH
SUZ-KA35VA2.TH
SUZ-KA60VA2.TH
SUZ-KA71VA2.TH
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 the following during servicing.
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and turn off the breaker.
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.
Lead wire
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp is blinking on and off to indicate an abnormality. To make sure,
check how many times the abnormality indication is blinking on and off before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and
the components for bursting and discoloration.
4) When troubleshooting, refer to 11-2. and 11-3.
OCH472A
22
11-2. Failure mode recall function
As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be
recalled by following the procedures below.
Use this function when the check code is not displayed with wired remote controller or the remote controller at use is
wireless type.
11-2-1. Flow chart of the indoor/outdoor unit failure mode recall function
Operational procedure (For wireless remote controller)
TO O
While pressing both OPERATION SELECT
button and TOO COOL button on the
remote controller at the same time,
press RESET button.
First, release RESET button.
And release the other two buttons since all LCD
in operation display section of the remote controller
is displayed after 3 seconds.
TO O
CO OL
CT
FAN
Setting up the failure mode recall function
AUTO
COOL
HEAT
DRY
VANE
SELE
TIME
ET
RES
Turn ON the power supply.
While pressing both OPERATION SELECT button and TOO COOL
button on the remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons since all LCD in operation display
section of the remote controller is displayed after 3 seconds.
h
1
Press OPERATE/STOP (ON/OFF) button of the remote controller
(the set temperature is displayed).
No
(OFF)
Does OPERATION INDICATOR lamp on the indoor
unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep sounds are emitted at the same timing of the
blinking of OPERATION INDICATOR lamp. 2
Judgment of indoor/outdoor abnormality
ON/OFF
TOO
WARM
TOO
COOL
1. Regardless of normal or abnormal, a short
beep is emitted once as the signal is received.
Indoor unit is normal.
There is a possibility that the plasma or outdoor unit is abnormal.
Confirm the failure detail on the LED display of the outdoor
controller board.(refer to 11-2-4.)
Yes
(Blinks)
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 confirm the
abnormal point.
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(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.
With the remote controller headed towards the indoor unit, press any button
that is not used in this failure mode recall function (e.g. TIMER button) .
OR
Turn OFF the power supply and turn ON it again.
Press RESET button of the remote controller.
OPERATION INDICATOR lamp
Repair the defective parts.
Note1. Make sure to release the failure mode recall function once 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:[Output pattern A]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep
Beep Beep Beep
1st
2nd
Beep
3 rd
n
Beep
th
1 st
Beep
2 nd · · · Repeated
Off
On
On
On
Off
On
On
On
0.5 sec. Approx. 2.5 sec.0.5 sec. 0.5 sec.
Self-check Approx. 2.5 sec.0.5 sec. 0.5 sec. 0.5 sec.
starts
(Start signal
Number of blinks/beeps in pattern indicates the check
Number of blinks/beeps in pattern indicates
received)
code in the next page (i.e., n=5 for “P5”)
the check code in the next page
3.Blinking pattern when the outdoor unit is abnormal:[Output pattern B]
Beeper sounds
OPERATION
INDICATOR
lamp blink
pattern
Beep
Beep Beep Beep
1 st
Off
Self-check Approx. 2.5 sec.
starts
(Start signal
received)
OCH472A
On
Approx. 3 sec.
2 nd
3 rd
On
On
On
0.5 sec. 0.5 sec.0.5 sec.
Beep
Beep
n th
1
On
Off
0.5 sec. Approx. 2.5 sec.
Number of blinks/beeps in pattern indicates the check
code in the next page (i.e., n=5 for “U2”)
23
On
Approx. 3 sec.
st
Beep
2
nd
· · · Repeated
On
On
0.5 sec. 0.5 sec.
Number of blinks/beeps in pattern indicates
the check code in the next page
11-2-2. Wired remote controller
°C
°C
SIMPLE
TEMP.
MENU
BACK
PAR-21MAA
MONITOR/SET
ON/OFF
ON/OFF
Turn on the power.
Press the [CHECK] button twice.
Set refrigerant address with [TEMP] button
if system control is used.
Press the [ON/OFF] button to stop the self-check.
FILTER
DAY
CLOCK
CHECK button
Refrigerant address
TEMP. button
IC: Indoor unit
OC: Outdoor unit
Check code
CHECK TEST
OPERATION
CLEAR
11-2-3. Failure mode table (Wireless remote controller/Wired remote controller)
[Output pattern A] Errors detected by indoor unit
Wired remote controller Wireless remote controller
Beeper sounds/OPERATION INDICATOR
Symptom
lamp blinks
(Number of times)
1
Intake sensor error
P1
Pipe (TH2) sensor error
P2
2
Pipe (TH5) sensor error
P9
3
Indoor/outdoor unit communication error
E6,E7
4
Drain sensor error/Float switch connector open
P4
5
Drain pump error
P5
6
Freezing/Overheating protection operation
P6
7
Communication error between indoor and outdoor units
EE
8
Pipe temperature error
P8
9
Remote controller signal receiving error
E4, E5
10
–
–
11
–
–
12
Indoor unit control system error (memory error, etc.)
Fb
–
Remote controller transmission error
E0, E3
–
Remote controller control board error
E1, E2
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Check code
Remark
Wired remote controller Wireless remote controller
Check code
E9
UP
U3,U4
UF
U2
U1,Ud
U5
U8
U6
U7
Beeper sounds/OPERATION INDICATOR
lamp blinks
(Number of times)
1
2
3
4
5
6
7
8
9
10
U9,UH
11
–
–
Others
12
13
14
Symptom
Remark
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/insufficient refrigerant
Abnormal high pressure (63H operated)/Overheating protection operation
Abnormal temperature of heat sink
For details, check the LED display
Outdoor unit fan protection stop
of the outdoor controller board.
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
–
–
Other errors
• If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp
does not come on, there are no error records.
• If the beeper sounds three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal
was received, the specified refrigerant address is incorrect.
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD.
OCH472A
24
11-2-4. Outdoor unit failure mode table
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
Abnormal point
(Failure mode/protection)
None (Normal)
LED indication
(Outdoor P.C. board)
Condition
Correspondence
—
—
—
Outdoor power system
—
Discharge temperature thermistor
SUZ-KA50VA2.TH
1-time flash every
2.5 seconds
Overcurrent protection stop is continuously
performed 3 times within 1 minute after
the compressor gets started.
• Reconnect connectors.
• Refer to 11-5. "How to check
inverter/compressor".
• Check stop valve.
Thermistor shorts or opens during compressor
running.
• Refer to 11-5. "Check
of outdoor thermistors".
Defective outdoor thermistors
can be identified by checking
the blinking pattern of LED.
Defrost thermistor
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
Overcurrent
11-time flash
2.5 seconds OFF
Large current flows into intelligent power module. • Reconnect compressor connector.
• Refer to 11-5. "How to check
inverter/compressor".
• Check stop valve.
Compressor synchronous abnormality
(Compressor start-up failure protection)
12-time flash
2.5 seconds OFF
Waveform of compressor current is distorted.
• Reconnect 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 ~ 80°C,
or temperature of P.C. board temperature
thermistor on the inverter P.C. board exceeds
70 ~ 75°C.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-5. "Check
of outdoor fan motor".
Outdoor fan has stopped 3 times in a row
within 30 seconds after outdoor fan start-up.
• Refer to 11-5. "Check
of outdoor fan motor".
Refer to 11-5. "Check
of inverter P.C. board".
Nonvolatile memory data cannot be read
properly.
• Replace the inverter P.C. board.
Discharge temperature
—
High pressure
—
Fin temperature/P.C. board temperature
7-time flash
2.5 seconds OFF
Outdoor fan motor
—
Nonvolatile memory data
5-time flash
2.5 seconds OFF
Discharge temperature
—
• Refer to 11-5. "Checkof LEV".
Temperature of discharge temperature
thermistor has been 50°C or less for 20 minutes. • Check refrigerant circuit
and refrigerant amount.
• Refer to 11-5. "How to check
inverter/compressor".
DC voltage
8-time flash
2.5 seconds OFF
DC voltage of inverter cannot be detected
normally.
Each phase current of compressor
9-time flash
2.5 seconds OFF
Each phase current of compressor cannot be
detected normally.
Overcurrent Compressor open-phase
10-time flash
2.5 seconds OFF
Large current flows into intelligent power
• Reconnect compressor connector.
module (IPM).
• Refer to 11-5. "How to check
The open-phase operation of compressor
inverter/compressor".
is detected.
The interphase short out occurs in the output of
the intelligent power module (IPM).
The compressor winding shorts out.
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.).
OCH472A
25
SUZ-KA60VA2.TH
Abnormal point
Outdoor LED indication
(Failure mode)
LED1
LED2
Outdoor thermistors
Lighting Once
Details of abnormal
Discharge temperature
thermistor
Defrost thermistor
Twice
Ambient temperature
thermistor
3 times
4 times
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
9 times
5 times
Outdoor control system
6 times
Converter control
system
7 times
5 times
Goes out
6 times
Goes out
Once
Goes out
3 times
Goes out
4 times
Goes out
Lighting Lighting
Detecting method
When a short circuit is detected in the
thermistor during operation, or when an
open circuit is detected in the thermistor
after 10 minutes of compressor start-up.
When a short circuit is detected in the
thermistor during operation, or when an
open circuit is detected in the thermistor
after 5 minutes of compressor start-up.
When a short or open circuit is detected
in the thermistor during operation.
• Replace the outdoor electronic
control P.C. board.
• Check the outdoor thermistors.
When a short circuit is detected in the
thermistor during operation, or when an open
circuit is detected in the thermistor after 5
minutes (in cooling) and 10 minutes (in heating)
of compressor start-up.
When nonvolatile memory data cannot
• Replace the outdoor electronic
EEPROM
be read properly, unit stops.
control P.C. board.
Communication error
When the communication between boards
• Check the connecting wire
protection stop is continuously performed twice.
between P.C. boards
between outdoor electronic
control P.C. board and power board.
Communication between
Communication error occurs between
the electronic control P.C.board and
P.C. boards protection
power board for more than 10 seconds.
Current sensor protection stop is
Current sensor
• Replace the power board.
continuously performed twice.
When a short or open circuit is
Current sensor protection
detected in the current sensor during
compressor operating.
The protection stop of the zero cross detecting • Check the connecting wire among
Zero cross detecting circuit
circuit is continuously performed 10 times.
electronic control P.C. board,
noise filter P.C. board and power
board.
When zero cross signal cannot be detected
Zero cross detecting
while the compressor is operating.
circuit protection
When a failure is detected in the operation
Converter protection
• Replace the power board.
of the converter during operation.
Bus-bar voltage protection (1) When the bus-bar voltage exceeds 400V or
falls to 200V or below during compressor operating.
Bus-bar voltage protection (2) When the bus-bar voltage exceeds
400V or falls to 50V or below during
+Even if this protection stop is
performed continuously 3 times, compressor operating.
it does not mean the abnormality
in outdoor power system.
When overcurrent is detected after
Overcurrent protection IPM protection
30 seconds of compressor start-up.
When overcurrent is detected within 30
Lock protection
seconds after the compressor gets started.
Fin temperature overheat
Fin temperature/P.C.
When the fin temperature exceeds 87
protection
during operation.
board temperature
overheat
P.C.boad temperature
When the P.C. board temperature exceeds
70 during operation.
overheat protection
Refrigerant system
Discharge temperature
When discharge temperature exceeds 116.
overheat protection
High pressure
protection
HPS protection
High pressure protection
(Overheat protection)
Low discharge
temperature
Low discharge
temperature protection
Outdoor fan
Outdoor fan protection
Outdoor power
system
Outdoor power system
• Check the connection of the
compressor connecting wire.
• Check the inverter/ compressor.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Check the outdoor fan motor.
• Check refrigerant circuit and
refrigerant amount.
• Check the LEV.
• Check the outdoor thermistors.
When high-pressure is detected with the
• Check refrigerant circuit and
high-pressure switch (HPS) during operation. refrigerant amount.
• Check the stop valve.
When the indoor coil thermistor (TH5)
exceeds 70 in HEAT mode.
When the outdoor heat exchanger thermistor
exceeds 70 in COOL mode.
• Check refrigerant circuit and
When the frequency of the compressor
is kept 80Hz or more and discharge
refrigerant amount.
temperature is kept under 39 for
• Check the LEV.
more than 20 minutes.
When outdoor fan has stopped within
• Check the outdoor fan motor.
30 seconds 3 times in a row after
outdoor fan start -up,unit stops.
When IPM protection stop or lock protection • Reconnect compressor connector.
stop is continuously performed 3 times within • Check the inverter/ compressor.
1 minute after the compressor get started,
• Check the stop valve.
or when converter protection stop or bus-bar • Check the PAM module.
voltage protection stop is continuously
performed 3 times within 3 minutes after start-up.
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3).
OCH472A
Check point
• Check the outdoor thermistors.
26
SUZ-KA71VA2.TH
Abnormal point
(Failure mode / protection)
None (Normal)
LED indication
(Outdoor P.C. board)
Condition
Correspondence
—
—
—
Outdoor power system
—
Discharge temperature thermistor
1-time flash every 2.5
seconds
Defrost thermistor
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
Overcurrent
Overcurrent protection stop is continuously
performed 3 times within 1 minute after the
compressor gets started.
• Reconnect connectors.
• Refer to 11-5. a"How to check inverter/
compressor".
• Check stop valve.
Thermistor shorts or opens during compressor • Refer to 11-5.g"Check of outdoor thermistors".
running.
Defective outdoor thermistors can be identified
by checking the blinking pattern of LED.
—
11-time flash
2.5 seconds OFF
Large current flows into intelligent power
module.
• Reconnect compressor connector.
• Refer to 11-5.a"How to check inverter/
compressor".
• Check stop valve.
Compressor synchronous abnormality 12-time flash
(Compressor start-up failure protection) 2.5 seconds OFF
Waveform of compressor current is distorted.
• Reconnect compressor connector.
• Refer to 11-5.a"How to check inverter/
compressor".
Discharge temperature
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.k"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 ~ 80°
C, or temperature of P.C. board temperature
thermistor on the inverter P.C. board exceeds
70 ~ 75°C.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-5.i"Check of outdoor fan motor".
Outdoor fan has stopped 3 times in a row
within 30 seconds after outdoor fan start-up.
• Refer to 11-5.i"Check of outdoor fan motor".
Refer to 11-5.l"Check of inverter P.C. board".
—
High pressure
—
Fin temperature/ P.C. board
temperature
7-time flash
2.5 seconds OFF
Outdoor fan motor
—
Nonvolatile memory data
5-time flash
2.5 seconds OFF
Nonvolatile memory data cannot be read
properly.
• Replace the inverter P.C. board.
Power module
6-time flash
2.5 seconds OFF
The interphase short circuit occurs in the
output of the intelligent power module (IPM).
The compressor winding shorts circuit.
• Refer to 11-5. a"How to check inverter/
compressor".
Temperature of discharge temperature
thermistor has been 50°C or less for 20
minutes.
• Refer to 11-5.k"Check of LEV".
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-5.a"How to check inverter/
compressor".
Discharge temperature
—
DC voltage
8-time flash
2.5 seconds OFF
DC voltage of inverter cannot be detected
normally.
Each phase current of compressor
9-time flash
2.5 seconds OFF
Each phase current of compressor cannot be
detected normally.
Overcurrent Compressor open-phase
10-time flash
2.5 seconds OFF
Large current flows into intelligent power
module (IPM).
The open-phase operation of compressor is
detected.
The interphase short circuit occurs in the
output of the intelligent power module (IPM).
The compressor winding shorts circuit.
• Reconnect compressor connector.
• Refer to 11-5. a"How to check inverter/
compressor".
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).
OCH472A
27
11-3. Trouble shooting check table
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
SUZ-KA50VA2.TH
point/ ConNo.
Symptom
LED indication Abnormal
Condition
Correspondence
dition
Outdoor unit 1-time flash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compresdoes not oper- 2.5 seconds
tem
within 1 minute after the compressor gets started, or failure of sor.
1 ate.
restart of compressor has repeated 24 times.
• 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 or ambi- thermistors".
2
ent temperature thermistor shorts or opens during compressor
running.
Outdoor control system
3
6-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
14-time flash
2.5 seconds OFF
4
5
6
7
8
'Outdoor unit 2-time flash
stops and
2.5 seconds OFF
restarts 3 minutes later' is
repeated.
3-time flash
2.5 seconds OFF
Serial signal
Stop valve/
Closed valve
Outdoor unit
(Other abnormality)
Nonvolatile memory data cannot be read properly.
(The left lamp of OPERATION INDICATOR lamp of the indoor
unit lights up or flashes 7-time.)
The communication fails between the indoor and outdoor unit • Refer to 11-5. "How to check misfor 3 minutes.
wiring and serial signal error.
Closed valve is detected by compressor current.
• Check stop valve.
Outdoor unit is defective.
• Refer to 11-2.1. "Flow chart of the
detailed outdoor unit failure mode
recall function".
Overcurrent protection
Large current flows into intelligent power module, or compres- • Reconnect connector of compressor repeats after 15 seconds when overcurrent protection ocsor.
curs within 10 seconds after compressor starts.
• Refer to 11-5. "How to check in(Repeated 24 times at Maximum)
verter/compressor".
• Check stop valve.
Discharge tempera- Temperature of discharge temperature thermistor exceeds
• Check refrigerant circuit and refrigture overheat protec- 116°C, compressor stops. Compressor can restart if discharge erant amount.
tion
temperature thermistor reads 100°C or less 3 minutes later.
• Refer to 11-5. "Check of LEV".
10
4-time flash
Fin temperature/P.C.
2.5 seconds OFF board temperature
thermistor overheat
protection
5-time flash
High pressure protec2.5 seconds OFF tion
11
8-time flash
Compressor synchro- The waveform of compressor current is distorted.
2.5 seconds OFF nous abnormality
12
10-time flash
Outdoor fan motor
2.5 seconds OFF
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
1-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
Each phase current
of compressor
DC voltage
Each phase current of compressor cannot be detected normally
DC voltage of inverter cannot be detected normally.
Frequency drop by
current protection
Frequency drop by
high pressure protection
Current from power outlet reaches the protection current, and
compressor frequency lowers.
Temperature of indoor coil thermistor exceeds 55°C in HEAT
mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL
mode
Indoor coil thermistor reads 8°C or less in COOL mode, compressor frequency lowers.
9
13
14
unit
15 Outdoor
operates.
16
17
18
19
20
Outdoor unit
operates.
Temperature of fin temperature thermistor on the heat sink
exceeds 75 ~ 80°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 70 ~ 75°C.
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
4-time flash
Frequency drop by
2.5 seconds OFF discharge temperature protection
Temperature of discharge temperature thermistor exceeds
111°C, compressor frequency lowers.
7-time flash
Low discharge tem2.5 seconds OFF perature protection
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
8-time flash
PAM protection PAM: The overcurrent flows into IGBT (Insulated Gate Bipolar tran2.5 seconds OFF Pulse Amplitude
sistor : TR821) or when the bus-bar voltage reaches 320 V or
Modulation
more, PAM stops and restarts.
9-time flash
Inverter check mode
2.5 seconds OFF
The connector of compressor is disconnected, inverter check
mode starts.
OFF
2.5-second OFF
OCH472A
28
This is not malfunction. PAM protection will be activated in the following
cases;
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is
high.
• Check if the connector of the compressor is correctly connected.
Refer to 11-5. "How to check inverter/ compressor".
Flashing →
0.5-second ON
2.5-second OFF
• 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 LEV".
• Check refrigerant circuit and refrigerant amount.
LED
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
• 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".
• 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.
Inverter P.C. board(Parts side)
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6-1. or 11-6-2.
2. LED is lighted during normal operation.
ON
• Replace inverter P.C. board.
SUZ-KA60VA2.TH
No. Symptom
Indication
LED1 (Red) LED2 (Yellow)
Condition
Abnormal point/Condition
Outdoor unit
does not
operate.
Lightning
Twice
Outdoor power system
When IPM protection stop or lock protection stop is continuously
performed three times within 1 minute after the compressor gets started,
or when converter protection stop or bus-bar voltage protection stop is
continuously performed three times within 3 minutes after start-up.
2
Lightning
3 times
Discharge temperature
thermistor
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 10 minutes
of compressor start-up.
3
Lightning
4 times
1
Correspondence
• Check the connection of the compressor connecting
wire.
• Refer to 11-5.% "How to check inverter/compressor".
• Check the stop valve.
• Refer to 11-5.& "Check of outdoor thermistor".
• Refer to 11-5.& "Check of outdoor thermistor".
Fin temperature thermistor
When a short or open circuit is detected in the thermistor during operation.
• Replace the outdoor electronic control P.C. board.
P.C board temperature thermistor
When a short or open circuit is detected in the thermistor during
Ambient temperature thermistor
operation.
4
Lightning
5 times
Outdoor heat exchanger
temperature thermistor
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes (in
cooling) and 10 minutes (in heating) of compressor start-up.
Defrost thermistor
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes of
compressor start-up.
• Refer to 11-5.& "Check of outdoor thermistor".
Refer to 11-5." "How to check mis-wiring and serial signal
error.
5
Lightning
6 times
Serial signal
When the communication fails between the indoor and outdoor unit for
3 minutes.
6
Lightning
7 times
Nonvolatile memory data
When the nonvolatile memory data cannot be read properly.
• Replace the outdoor electronic control P.C. board.
7
Lightning
8 times
Current sensor
Current sensor protection stop is continuously performed twice.
• Replace the power board.
8
Lightning
11 times
Communication error
between P.C. boards
When the communication protection stop between boards is
continuously performed twice.
9
Lightning
12 times
Zero cross detecting circuit
The protection stop of the zero cross detecting circuit is continuously
performed 10 times.
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
IPM protection
When over-current is detected after 30 seconds of compressor start-up.
Lock protection
When over-current is detected within 30 seconds of compressor start-up.
'Outdoor unit
stops and
restarts 3
Twice
10 minutes
later' is
repeated.
Goes out
11
3 times
Goes out
12
4 times
Goes out
13
5 times
Goes out
14
8 times
Goes out
15
9 times
Goes out
When temperature of discharge temperature thermistor exceeds 116:,
Discharge temperature protection compressor stops. Compressor can restart if discharge temperature
thermistor reads 100 or less 3 minutes later.
• Check the amount of gas and refrigerant circuit.
• Refer to 11-5.$"Check of LEV".
Fin temperature protection
•Check refrigerant circuit and refrigerant amount.
•Refer to 11-5.$ "Check of LEV".
High-pressure protection
Converter protection
Bus-bar voltage protection (2)
16
13 times
Goes out
Outdoor fan motor
17
Lighting
8 times
Current sensor protection
Lighting
11 times
19
Lighting
12 times
When the fin temperature exceeds 87 during operation.
P.C. board temperature protection When the P.C. board temperature exceeds 70 during operation.
Bus-bar voltage protection (1)
18
• Reconnect compressor connector.
• Refer to 11-5.% "How to check inverter/compressor".
• Check the stop valve.
• Check the power module (PAM module).
Communication between P.C.
boards protection
Zero cross detecting circuit
protection
When high-pressure is detected with the high-pressure switch (HPS)
during operation.
When the outdoor heat exchanger temperature exceeds 70
during cooling or when indoor gas pipe temperature exceeds 70
during heating.
When a failure is detected in the operation of the converter during
operation.
When the bus-bar voltage exceeds 400V or falls to 200V or below
during compressor operating.
When the bus-bar voltage exceeds 400V or falls to 50V or below
during compressor operating.
When failure occurs continuously three times within 30 seconds after
the fan gets started.
When a short or open circuit is detected in the current sensor during
compressor operating.
Communication error occurs between the outdoor electronic control P.C.
board and power board for more than 10 seconds.
When zero cross signal cannot be detected while the compressor is
operating.
NOTE 1. The location of LED is illustrated at the right figure.
2. LED is lighted during normal operation.
• Check around of gas and the refrigerant circuit.
• Check of stop valve.
• Replace the power board.
• Replace the power board.
• Refer to 11-5.' "Check of outdoor fan motor".
• Replace the power board.
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
Outdoor electronic control P.C. board (Parts side)
LED2 LED1
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
ON
OFF
OCH472A
2.5-second OFF
2.5-second OFF
29
Lighting
0.5-second ON
SUZ-KA60VA2.TH
No.
20
Symptom
Outdoor unit
operates.
21
Indication
LED1 (Red) LED2 (Yellow)
Once
Lighting
Twice
Lighting
Condition
Abnormal point/Condition
Primary current protection
When the input current exceeds 15A.
Secondary current protection
When the current of the compressor
exceeds 15A.
High-pressure protection
When the indoor gas pipe temperature
exceeds 45 during heating.
Defrosting in cooling
When the indoor gas pipe temperature
falls 3 or below during cooling.
Correspondence
These symptoms do not mean any abnormality
of the product, but check the following points.
• Check if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation
is short cycled.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-5.$ "Check of LEV".
• Refer to 11-5.& "Check of outdoor thermistors".
22
3 times
Lighting
Discharge temperature
protection
When the discharge temperature exceeds
100 during operation.
23
4 times
Lighting
Low discharge
temperature protection
When the frequency of the compressor is kept
80Hz or more and the discharge temperature • Refer to 11-5.$ "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
is kept under 39 for more than 20 minutes.
Lighting
Cooling high-pressure
protection
When the outdoor heat exchanger
temperature exceeds 58 during operation.
9 times
Lighting
Inverter check mode
When the unit is operated with emergency
operation switch.
Lighting
Lighting
Normal
5 times
24
25
26
Outdoor unit
operates
OCH472A
-
30
This symptom does not mean any abnormality
of the product, but check the following points.
• Check if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation
is short cycled.
-
-
SUZ-KA71VA2.TH
No.
1
Symptom
Outdoor unit
does not operate.
Abnormal point/
Condition
1-time flash every Outdoor power sys2.5 seconds
tem
LED indication
3
6-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
14-time flash
2.5 seconds OFF
5
6
7
8
Outdoor control sys- Nonvolatile memory data cannot be read properly.
tem
(The upper lamp of OPERATION INDICATOR 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.
Stop valve/
Closed valve is detected by compressor current.
Closed valve
Outdoor unit
Outdoor unit is defective.
(Other abnormality)
'Outdoor unit 2-time flash
stops and
2.5 seconds OFF
restarts 3
minutes later'
is repeated.
3-time flash
2.5 seconds OFF
Overcurrent protection
Large current flows into intelligent power module.
4-time flash
2.5 seconds OFF
Fin temperature
/P.C. board temperature thermistor
overheat protection
High pressure protection
Temperature of fin temperature thermistor on the heat sink
exceeds 75 ~ 80°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 70 ~ 75°C.
9
5-time flash
2.5 seconds OFF
11
8-time flash
2.5 seconds OFF
Compressor synThe waveform of compressor current is distorted.
chronous abnormality
10-time flash
2.5 seconds OFF
Outdoor fan motor
12
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
1-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
Each phase current
of compressor
DC voltage
Each phase current of compressor cannot be detected normally.
DC voltage of inverter cannot be detected normally.
Frequency drop by
current protection
Frequency drop by
high pressure protection
Current from power outlet is nearing breaker capacity.
PFC module stops due to overcurrent.
Temperature of indoor coil thermistor exceeds 55°C in HEAT
mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL
mode
Indoor coil thermistor reads 8°C or less in COOL mode, compressor frequency lowers.
4-time flash
2.5 seconds OFF
Frequency drop by
discharge temperature protection
Temperature of discharge temperature thermistor exceeds
111°C, compressor frequency lowers.
7-time flash
2.5 seconds OFF
Low discharge temperature protection
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
8-time flash
2.5 seconds OFF
Zero cross detecting Zero cross signal for PAM control cannot be detected.
circuit
9-time flash
2.5 seconds OFF
Inverter check mode The connector of compressor is disconnected, inverter check
mode starts.
13
14
Outdoor unit
operates.
16
17
18
Outdoor unit
operates.
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
19
20
• Replace inverter P.C. board.
• Refer to 11-5. m"How to check miswiring and serial signal error.
• Check stop valve.
• Refer to 11-2.1. "Flow chart of the
detailed outdoor unit failure mode
recall function".
• Reconnect connector of compressor.
• Refer to 11-5. a"How to check inverter/compressor".
• Check stop valve.
• Check refrigerant circuit and refrigDischarge tempera- Temperature of discharge temperature thermistor exceeds
ture overheat protec- 116°C, compressor stops. Compressor can restart if discharge erant amount.
• Refer to 11-5. k"Check of LEV".
tion
temperature thermistor reads 100°C or less 3 minutes later.
10
15
Correspondence
Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compreswithin 1 minute after the compressor gets started.
sor.
• Refer to 11-5.a "How to check inverter/compressor".
• Check stop valve.
Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, • Refer to 11-5.g "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
4
Condition
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6-3.
2. LED is lighted during normal operation.
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
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 11-5. i"Check of outdoor
fan motor".
• Check refrigerant circuit and refrigerant amount.
• Check stop valve.
• Reconnect connector of compressor.
• Refer to 11-5. a"How to check inverter/compressor".
• Refer to 11-5. i"Check of outdoor
fan motor.
• Refer to 11-5. l"Check of inverter
P.C. board.
• Refer to 11-5. a"How to check inverter/compressor".
• Refer to 11-5. a"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.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-5. k"Check of LEV".
• Refer to 11-5. g"Check of outdoor
thermistors".
• Refer to 11-5. k"Check of LEV".
• Check refrigerant circuit and refrigerant amount.
This is not malfunction. PAM protection will be activated in the following cases:
1 Instantaneous power voltage
drop. (Short time power failure)
2 When the power supply voltage
is high.
• Check if the connector of the compressor is correctly connected.
Refer to 11-5. a"How to check
inverter/compressor".
Inverter P.C. board
Flashing
→
LED
ON
OFF
2.5-second OFF
OCH472A
2.5-second OFF
31
11-4. Trouble criterion of main parts (1)
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
Part name
Check method and criterion
Figure
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Measure the resistance using a tester.
Ambient temperature
thermistor (RT65)
Refer to 11-6. “Test point diagram and voltage”, 11-6-1.
“Inverter P.C. board”, for the chart of thermistor.
Outdoor heat exchanger
temperature thermistor(RT68)
Discharge temperature
thermistor (RT62)
Measure the resistance using a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-6. “Test point diagram and voltage”, 11-6-1.
“Inverter P.C. board”, for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Temperature : -20°C ~ 40°C)
Normal
Compressor
U-V
U-W
V-W
SUZ-KA25VA2.TH
SUZ-KA35VA2.TH
1.36 ~ 1.93 1.52 ~ 2.17 Measure the resistance between terminals using a tester.
(Temperature : -20°C ~ 40°C)
Outdoor fan motor
Normal
Color of the lead wire
WHT - BLK
BLK - RED
RED - WHT
WHT
RED BLK
W
V
WHT
U
RED BLK
W
29 ~ 42 V
U
Measure the resistance between terminals using a tester.
(Temperature : -20°C ~ 40°C)
R.V. coil (21S4)
Normal
1.19 k ~ 1.78 k
Measure the resistance using a tester.
(Temperature : -20°C ~ 40°C)
OCH472A
WHT
32
BLU
37 ~ 54 LEV
RED
ORN
YLW
Normal
BRN
Expansion valve coil
(LEV)
Color of the lead wire
WHT - RED
RED - ORN
YLW - BRN
BRN - BLU
11-4. Trouble criterion of main parts (2)
SUZ-KA50VA2.TH SUZ-KA60VA2.TH SUZ-KA71VA2.TH
Part name
Check method and criterion
Defrost thermistor
(RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance using a tester.
Discharge temperature
thermistor (RT62)
Measure the resistance using a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Figure
Refer to 11-6. “Test point diagram and voltage”, 11-6-4. “Outdoor
electronic control P.C. board” or 11-6-2, 11-6-3. “Inverter P.C. board”,
for the chart of thermistor.
Refer to 11-6. “Test point diagram and voltage”, 11-6-4. “Outdoor
electronic control P.C. board” or 11-6-2, 11-6-3. “Inverter P.C. board”,
for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Temperature : -10°C ~ 40°C)
WHT
RED BLK
Normal
Compressor
W
SUZ-KA50/60VA2.TH
SUZ-KA71VA2.TH
0.86 ~ 1.06 0.92 ~ 1.12 V
U
Measure the resistance between lead wires using a tester.
(Temperature : -10°C ~ 40°C)
Outdoor fan motor
Normal
Color of the lead wire SUZ-KA50/60VA2.TH
SUZ-KA71VA2.TH
RED - BLK
13.4 ~ 16.4 12 ~ 17 BLK - WHT
WHT - RED
WHT
RED BLK
W
V
U
Measure the resistance using a tester.
(Temperature : -10°C ~ 40°C)
R.V. coil (21S4)
Expansion valve coil
(LEV)
Normal
SUZ-KA50/60VA2.TH
1.32 k ~ 1.62 k
SUZ-KA71VA2.TH
1.19 k ~ 1.78 k
Measure the resistance using a tester.
(Temperature : -10°C ~ 40°C)
SUZ-KA50/60VA2.TH
Normal
Color of the lead wire
WHT - RED
RED - ORN
37.4 ~ 53.9 YLW - BRN
BRN - BLU
SUZ-KA70VA2.TH
Color of the lead wire
RED - ORN
RED - WHT
RED - BLU
RED - YLW
High pressure switch
(HPS)
SUZ-KA60VA2.TH
OCH472A
WHT
LEV
RED
ORN
YLW BRN BLU
WHT
Normal
LEV
37 ~ 54 ORN
RED
YLW
Pressure
3.7 ± 0.15 MPa
4.8 +- 0.05
0.1 MPa
33
Close
Open
BLU
[SUZ-KA25/35/50VA2.TH]
11-5. Troubleshooting flow
A How to check inverter/compressor
Disconnect the connector between compressor
and the intelligent power module (IPM).
See B “Check of open phase”.
Check the voltage between terminals.
Are the voltages balanced?
Yes
No
Replace the inverter P.C. board.
See D “Check of compressor”.
Check the compressor.
B Check of open phase
With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the balance of voltage between the terminals.
The output voltage values have the tolerance of ± 20%.
<< Operation method(Test run operation)>>
1. Press the EMERGENCY OPERATION switch or the Test button to COOL or HEAT mode.
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor starts at rated frequency in COOL mode or 58Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts.
6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or the ON/OFF
button on remote controller.
<<Measurement point>>
At 3 points
BLK (U) - WHT (V)
BLK (U) - RED (W)
WHT (V) - RED (W)
9-time flash
2.5-second OFF
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, 11-6-2)
C Check of compressor
Refer to e “Check of compressor winding”.
Is the compressor normal?
No
Replace the compressor.
Yes
Refer to f “Check of compressor operation
time”.
Does the compressor operate continuously?
Yes
OK.
OCH472A
No
Is the compressor
operation time more than No
10 seconds?
Yes
Check the refrigerant circuit.
34
Replace the compressor.
[SUZ-KA25/35/50VA2.TH]
D Check of compressor winding
Disconnect the connector between the compressor and intelligent power module, 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.
<<Judgement>>
E Check of compressor operation time
Connect the compressor and activate the inverter. Then measure the
time until the inverter stops due to over current.
<<Operation method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION : Refer to 11-5 B.)
<<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 outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Is the thermistor normal?
(Refer to 11-6-1. or 11-6-2. )
Yes
No
Replace the thermistor except RT64.
When RT64 is abnormal, replace the inverter P.C.
board or the outdoor power 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
or the outdoor power board.
OK.
(Cause is poor contact.)
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
OCH472A
35
Board
Inverter P.C. board
[SUZ-KA25/35/50VA2.TH]
G Check of R.V. coil
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.
In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector
although any signal is not being transmitted to R.V. coil.
Check if CN721 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector between
the compressor and the intelligent
power module.
Turn ON the power supply and
press EMERGENCY OPERATION
switch twice (HEAT mode).
Is there 230 VAC between CN721 and
on the inverter P.C. board 3 minutes
after the power supply is turned ON?
No
Replace the 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 intelligent
power module.
Turn ON the power supply and
press EMERGENCY OPERATION
switch once (COOL mode).
Is there 230 VAC between CN721 and
on the inverter P.C. board 3 minutes
after the power supply is turned ON?
Replace the inverter
Yes P.C. board.
No
Replace the 4-way valve.
H Check of outdoor fan motor
SUZ-KA25/35VA2.TH
Disconnect CN932 from the inverter
P.C. board, and measure the resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to 11-4.)
Replace the outdoor fan motor.
No
Yes
Replace the inverter P.C. board.
SUZ-KA50VA2.TH
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 outdoor electronic control P.C. board or 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
Replace the outdoor fan motor.
OCH472A
Does the voltage between each terminal become 5 and 0
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Replace the outdoor electronic control P.C. board or the inverter P.C. board.
36
[SUZ-KA25/35/50VA2.TH]
280 - 370 VDC
I Check of power supply
DB61
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the left lamp of OPERATION
INDICATOR lamp on the indoor unit
light up?
Yes
Is there voltage 280 - 370 VDC
between DB61 (+) and DB61 (–) on
the inverter P.C. board?
(Refer to 11-6-1. or 11-6-2.)
No
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 230 VAC
between the indoor terminal
block S1 and S2?
No
No
Dose LED on the inverter P.C.
board light up or flash?
(Refer to 11-6-1. or 11-6-2.)
Yes
Yes
No
Replace the indoor
electronic control P.C.
board.
Replace the inverter
P.C. board.
If light up, OK.
If flash, refer to 11-3.
Check the electric parts in main circuit.
J Check of LEV
Inverter P.C. board
(Solder side)
(For wireless remote controller use model)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except
the set temperature in operation display section of the
remote controller is displayed after 3 seconds.
ON/O
FF
TO O
WA RM
TO O
CO OL
CT
FAN
COOL
AUTO
DRY
HEAT
SELE
TIME
VANE
E
MOD
T
RESE
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
h
ON/OFF
TOO
WARM
TOO
COOL
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 ON it again.
2. Press RESET button on the remote controller.
OCH472A
37
[SUZ-KA25/35/50VA2.TH]
J Check of LEV
(For wired remote controller use model)
Start
Turn on power supply to the outdoor unit after checking
LEV coil is fixed to the LEV body securely.
Yes
Normal
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
No
Disconnect the connector CN724 is there normal resistance to LEV coil?
Yes
Replace the inverter P.C. board.
No
Replace the LEV coil.
K Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to H.)
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.
OCH472A
38
[SUZ-KA25/35/50VA2.TH]
L How to check miswiring and serial signal error
(For wireless remote controller use model)
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the
power to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Yes
Is there any miswiring, poor
contact, or wire disconnection
of the indoor/outdoor connecting wire?
No
Yes
Correct them.
No
A
As for indoor unit.
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
1. Miswiring may damage indoor electronic control P.C. board
during the operation.
Be sure to confirm the wiring is correct before the operation
starts.
3. Be sure to check this within 3 minutes after turning ON. After
3 minutes, LED blinks 6 times. Even when the inverter P.C.
board or the outdoor electronic control P.C. board is normal,
LED blinks 6 times after 3 minutes.
Turn ON the power supply.
Does the LED on the inverter P.C. board or
the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
OCH472A
• Reinstall
either the unit
or the light
away from
each other.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2 and
S3? <Confirmation of serial signal>
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Yes
No
(Lighted
or not
lighted)
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
No
No
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
2. Be careful of the residual voltage of smoothing
capacitor.
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function after checking.
39
Replace the indoor/
outdoor connecting
wire.
Replace the indoor/
outdoor connecting
wire.
[SUZ-KA25/35/50VA2.TH]
L How to check miswiring and serial signal error
(For wired remote controller use model)
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press TEST button once.
Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the
power to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Yes
Is there any miswiring, poor
contact, or wire disconnection
of the indoor/outdoor connecting wire?
No
Yes
Correct them.
No
A
As for indoor unit.
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
1. Miswiring may damage indoor electronic control P.C. board
during the operation.
Be sure to confirm the wiring is correct before the operation
starts.
3. Be sure to check this within 3 minutes after turning ON. After
3 minutes, LED blinks 6 times. Even when the inverter P.C.
board or the outdoor electronic control P.C. board is normal,
LED blinks 6 times after 3 minutes.
Turn ON the power supply.
Does the LED on the inverter P.C. board or
the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
away from
each other .
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
OCH472A
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2 and
S3? <Confirmation of serial signal>
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Yes
No
(Lighted
or not
lighted)
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
No
No
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
2. Be careful of the residual voltage of smoothing
capacitor.
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function after checking.
40
Replace the indoor/
outdoor connecting
wire.
Replace the indoor/
outdoor connecting
wire.
[SUZ-KA25/35/50/60VA2.TH]
M 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.
OCH472A
41
[SUZ-KA60VA2.TH]
Outdoor unit does not operate. (LED display: display OFF)
N Check of power supply
Start
Check the connecting of parts of main power supply circuit.
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
No
Check the power supply cable.
Yes
Is the output voltage from the noise
filter P.C. board 230V AC?
No
Is fuse (F64) blown?
No
Yes
Yes
Is the input voltage to the power board
230V AC?
Replace the fuse.
No
Replace the reactor.
Yes
No
Is the input voltage to the outdoor
electronic control P.C. board 325V DC?
Replace the power board.
Yes
Replace the outdoor electronic control
P.C. board.
OCH472A
42
Replace the noise
filter P.C. board.
[SUZ-KA60VA2.TH]
When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
Outdoor unit does not operate.
O How to check miswiring and serial signal error (when outdoor unit does not work)
(For wireless remote controller use model)
As for indoor unit.
Turn OFF the power supply.
Is there rated voltage in
the power supply?
No
Check the power
supply.
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
No
Check the wiring.
Yes
Press EMERGENCY OPERATION switch once.
Does the lamp of OPERATION INDICATOR
lamp light up?
<Confirmation of the power to the indoor unit>
No
Yes
Is serial signal error indicated 6 minutes later?
No
Yes
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor
connecting wire?
Yes
Make them correct.
No
A
Outdoor electronic control P.C. board
(Parts side)
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not mis-wiring.
Short-circuit outdoor terminal block is S2
and S3.
1
1. Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
3. Be sure to check this within 3 minutes after turning
ON. After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after 3 minutes.
LED2 LED1
Turn ON the power supply.
Blinking
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-secondquick blinking"? 3
No
(Lighted
or not
lighted)
Yes
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated
6 minutes later?
Yes
B
OCH472A
· Reinstall the
unit away from
inverter-contro
lled lighting
No
equipment.
· Attach a filter
on receiving
section of the
indoor unit.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
No
Replace the inverter P.C. board
or the outdoor electronic control
P.C.board. 2
2 Be careful of the residual
voltage of smoothing capacitor.
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
Replace the
indoor/outdoor
connecting wire.
Yes
Replace the
indoor/outdoor
connecting wire.
No
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode
recall function after checking.
43
No
[SUZ-KA60VA2.TH]
When unit cannot operate neither by the remote controller.
Indoor unit does not operate.
Outdoor unit does not operate.
O How to check miswiring and serial signal error (when outdoor unit does not work)
(For wired remote controller use model)
As for indoor unit.
Turn OFF the power supply.
No
Is there rated voltage in the
power supply?
Check the power
supply.
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
No
Check the wiring.
Yes
Press TEST button twice.
Does the left lamp of OPERATION INDICATOR
lamp on remote controller light up?
<Confirmation of the power to the indoor unit>
No
Yes
No
Is the self-check of the remote controller
displayed 6 minutes after?
Serial signal error display
Is there any mis
wiring, poor contact,
or wire disconnection
of the indoor/outdoor
connecting wire?
Yes
Make them sure.
Yes
No
The left lamp of
OPERATION INDICATOR
lamp blinks.
A
Outdoor electronic control P.C. board
(Parts side)
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not mis-wiring.
Short-circuit outdoor terminal block is S2
and S3.
1
1. Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
3. Be sure to check this within 3 minutes after turning
ON. After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after 3 minutes.
LED2 LED1
Blinking
Turn ON the power supply.
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-secondquick blinking"? 3
No
(Lighted
or OFF)
Yes
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press TEST button twice.
Is serial signal
error indicated
6 minutes later?
Yes
B
· Reinstall the
unit away from
inverter-contro
No lled lighting
equipment.
· Attach a filter
on receiving
section of the
indoor unit.
OCH472A
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
No
Replace the inverter P.C. board
or the outdoor electronic control
P.C.board. 2
2 Be careful of the residual
voltage of smoothing capacitor.
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
Replace the
indoor/outdoor
connecting wire.
No
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode
recall function after checking.
44
Yes Replace the
indoor/outdoor
connecting wire.
[SUZ-KA60VA2.TH]
The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting)
P Check of R.V. coil
• When heating operation does not work.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION in HEAT mode.
Is there voltage of 230V AC between pin1 and
pin 2 at connector CN912? 1. Turn off power supply of indoor and outdoor unit, and
disconnect the connector CN781 in the outdoor electronic
control P.C. board.
2. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION in HEAT mode.
No
Yes
Turn off power supply of indoor and outdoor unit.
Disconnect the connector
CN912 in noise filter P. C.
board. Is there normal
resistance to R.V. coil?
No
Is there voltage 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-)?
Replace the R.V. coil.
Replace the noise filter P.C. board.
Replace the 4-way valve.
• When cooling operation does not work.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION in COOL mode.
Is there voltage of 230V AC between pin1 and
pin 2 at connector CN912? No
Replace the 4-way valve.
Yes
1. Turn off power supply of indoor and outdoor unit, and
disconnect the connector CN781 in the outdoor electronic
control P.C. board.
2. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION in COOL mode.
No
Replace the noise filter P.C. board.
Yes
Replace the outdoor electronic control P.C. board.
OCH472A
Replace the electronic
control P.C. board.
Yes
Yes
Is there voltage 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-)?
No
45
If the connector CN912 is
not connected or R.V. coil
is open, voltage occurs
between terminals even
when the control is OFF.
[SUZ-KA60VA2.TH]
When cooling, heat exchanger of non-operating indoor unit frosts.
When heating, non-operating indoor unit get warm.
LED display:
Q Check of LEV
LED1
Lighting
6 time
LED2
Lighting
Goes out
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Yes
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Normal
No
Yes
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Replace the outdoor electronic
control P.C. board.
No
Replace the LEV coil.
When heating, room does not get warm.
When cooling, room does not get cool.
R How to check inverter/ compressor
LED display:
LED2
Lighting
Twice
Goes out
LED1
Lighting
Lighting
Twice
Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is voltage output on right table?
Yes
Is output balanced?
Yes
• After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
• The output voltage values have the tolerance of $20%.
No
No
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
No
Replace the power board.
Yes
Turn off power supply of indoor and outdoor unit,
and measure the compressor winding resistance
between the compressor terminals.
Is the resistance between each terminal normal?
No
Yes
Replace the
compressor.
Reconnect the lead wire of compressor, and turn on
power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
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46
COOL
HEAT
150V
(48Hz)
170V
(64Hz)
[SUZ-KA60VA2.TH]
When thermistor is abnormal.
S Check of outdoor thermistors
Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board Yes
(see below table), and measure the resistance of thermistor. Is the thermistor normal?
Replace the thermistor.
No
Reconnect the connector CN661 on the outdoor electronic control P.C. board and CN3 on the power board, and
disconnect the lead wire leading to the compressor.
3 minutes after turning on the power supply, start (EMERGENCY) OPERATION.
Does thermistor operate 10 minutes or more though the
thermistor abnormality is not displayed?
No
Replace the outdoor electronic
control P.C. board.
Yes
Normal
Thermistor
Defrost thermistor
Discharge temperature thermistor
Outdoor heat exchanger temperature thermistor
Fin temperature thermistor
Ambient temperature thermistor
Symbol
RT61
RT62
RT68
RT64
RT65
Connector, Pin No.
Between CN661 pin1 and pin2 on the outdoor electronic control P.C. board
Between CN661 pin3 and pin4 on the outdoor electronic control P.C. board
Between CN661 pin7 and pin8 on the outdoor electronic control P.C. board
Between CN3 pin1 and pin2 on the outdoor power board
Between CN663 pin1 and pin2 on the outdoor electronic control P.C. board
Fan motor does not operate or stops operating shortly after starting the operation.
T Check of outdoor fan motor
Start
Check the connection between the
connector CN931 and CN932.
Is the resistance between each terminal
of outdoor fan motor normal?
Yes
Disconnect CN932 from outdoor electronic control P.C. board, and
turn on the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between (+) and (-)
Between (+) and (-)
Between (+) and (-)
No
(Fixed to either 5V or 0V DC)
No
Replace the outdoor DC fan motor.
OCH472A
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
Yes
Does the outdoor fan motor rotates smoothly?
Yes
Replace the outdoor electronic control P.C. board.
47
[SUZ-KA60VA2.TH]
When the operation frequency does not go up from lowest frequency.
U Check of HPS
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off.
Infinity
Check the resistance between
each terminal.
Replace HPS.
0
Reconnect CN681.
Turn on power supply to the indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
Yes
Replace the electronic control P.C. board.
No
Normal
Outdoor unit does not operate at all, or stops immediately due to overcurrent.
V Check of current-limiting resistor
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
Is the resistance of current-limiting
resistor (R64A or R64B) on the
noise filter P.C. board normal?
(Normal resistance : 5$5%)
Not
open
Turn ON the power
supply and press
EMERGENCY
OPERATION switch.
Does LED on the outdoor
electronic control P.C. board
light up?
No
Replace the noise filter P.C.
board or the outdoor
electronic control P.C.
board.
Yes
Open
Replace the power P.C. board.
Does the rush current
limiting relay(X64) work
properly?
Yes
No
Replace the noise filter P.C.board.
OCH472A
48
Replace the outdoor
electronic control P.C.
board or power P.C.board
or the compressor.
[SUZ-KA71VA2.TH]
a How to check inverter/compressor
Disconnect the connector between
compressor and the intelligent power module
(IPM).
See 11-5.
Check the voltage between terminals.
Are the voltages balanced?
Yes
No
“Check of open phase”.
Replace the inverter P.C. board.
See 11-5. D “Check of compressor”.
Check the compressor.
b Check of open phase
● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the balance of voltage between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method(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 74 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.
<<Measurement point>>
At 3 points
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)
Measure AC voltage between the lead wires at 3 points.
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board flashes 9 times. (Refer to 11-6.3.)
c Check of compressor
Refer to 11-5. d“Check of compressor
winding”.
Is the compressor normal?
Yes
Refer to 11-5. e“Check of compressor
operation time”.
Does the compressor operate continuously?
Yes
No
No
Replace the compressor.
Refer to 11-5. f“Check of compressor start failure”.
OK.
OCH472A
49
[SUZ-KA71VA2.TH]
d Check of compressor winding
●Disconnect the connector between the compressor and intelligent power module, 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 11-5 b.)
<<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 b.)
. Direct current voltage between JP715(+) and JP30(-) 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.
Heating part
OCH472A
50
[SUZ-KA71VA2.TH]
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 11-6-3.)
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.)
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
Board
Inverter P.C. board
h Check of R.V. coil
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4.
In case 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 intelligent power
module.
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 intelligent
power module.
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.
OCH472A
51
Replace the inverter
Yes P.C. board.
[SUZ-KA71VA2.TH]
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.
J Check of power supply
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Yes
Is there bus-bar voltage 325 - 370
VDC between JP715 (+) and JP30
(–) on the inverter P.C. board?
(Refer to 11-6.3.)
No
Check the electric parts in main circuit.
Rectify indoor/outdoor
connecting wire.
No
Yes
Yes
Is there voltage 230 VAC
between the indoor terminal
block S1 and S2?
Dose LED on the inverter P.C.
board light up or flash? (Refer
to 11-6.3.)
Yes
No
No
Replace the indoor
electronic control P.C.
board.
Replace the inverter
P.C. board.
If light up, OK.
If flash, refer to 11-3.
JP30 JP715
325 -370 VDC
OCH472A
52
[SUZ-KA71VA2.TH]
k Check of LEV
(For wireless remote controller use model)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and
TOO COOL button on the remote controller at the same
time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except the
set temperature in operation display section of the remote
controller is displayed after 3 seconds.
ON/O
FF
TO O
WA RM
TO O
CO OL
CT
FAN
COOL
AUTO
DRY
HEAT
VANE
SELE
TIME
E
MOD
T
RESE
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
h
ON/OFF
TOO
WARM
TOO
COOL
Expansion valve operates in full-opening direction.
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
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.
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
No
Replace the inverter P.C.
board.
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.
k Check of LEV
(For wired remote controller use model)
Start
Turn on power supply to the outdoor unit after checking
LEV coil is fixed to the LEV body securely.
Yes
Normal
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
No
Disconnect the connector CN724 is there normal resistance to LEV coil?
No
Replace the LEV coil.
OCH472A
53
Yes
Replace the inverter P.C. board.
[SUZ-KA71VA2.TH]
l Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 11-5.i.)
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.
OCH472A
54
[SUZ-KA71VA2.TH]
m How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power
to the indoor unit>
Yes
Is serial signal error indicated 6 minutes
later?
Yes
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
No
No
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
Yes
Correct them.
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board is normal, LED blinks 6 times after 3
minutes.
Turn ON the power supply.
Is the bus-bar voltage of the inverter P.C. board normal?
(Refer to "TEST POINT DIAGRAM AND VOLTAGE" of the outdoor unit.)
No
Yes
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
No
(Lighted
or not
lighted)
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Replace the indoor electronic control P.C. board.
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
away from
each other.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
OCH472A
55
Replace the inverter P.C. board. 2
2. Be careful of the residual voltage of smoothing
capacitor.
[SUZ-KA71VA2.TH]
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.
OCH472A
56
11-6. Test point diagram and voltage
11-6-1. Inverter P.C. board
SUZ-KA25VA2.TH SUZ-KA35VA2.TH
Smoothing
capacitor
(C63)
DB61
DC 260 - 300 V
(-)
(+)
Back side of unit
Smoothing
capacitor
(C62)
Smoothing
capacitor
(C61)
Fuse (F701)
250 V 3.15 A
Fuse (F801)
250 V 3.15 A
AC 230 V
R.V.coil
(CN721)
230 VAC
Fuse (F901)
250 V 3.15 A
Output to
drive
compressor
(LDU, LDV,
LDW)
100
Discharge temperature
thermistor /RT62
(CN641)
Defrost thermistor
/RT61(CN641)
Ambient temperature
thermistor /RT65
(CN643)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
Fin temperature
thermistor /RT64
(CN642)
Front side of unit
Output to drive outdoor
fan motor (CN932)
AC 230 V
LEV
connector
(CN724)
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
80
Fin temperature thermistor(RT64)
160
Discharge temperature thermistor(RT62)
700
60
600
50
40
30
20
10
-10
0
10 20 30
Temperature(°C)
OCH472A
40
140
Resistance(kΩ)
70
Resistance(kΩ)
Resistance(kΩ)
Jumper wire for
changing defrost
setting (JS)
180
90
0
-20
LED
monitor
lamp
500
400
300
120
100
80
60
200
40
100
20
0
0
10
20
30
40
50
60
70
80
90 100 110 120
Temperature(°C)
57
0
0
10 20 30 40 50 60 70 80
Temperature(°C)
11-6-2. Inverter P.C. board
SUZ-KA50VA2.TH
Back side of unit
Smoothing
capacitor
(C63)
DB61
DC 260 ~300 V
(-)
(+)
Smoothing
capacitor
(C62)
Smoothing
capacitor
Fuse (F701)
(C61)
250 V 3.15 A
R.V.coil
(CN721)
230 VAC
Fuse (F801)
250 V 3.15 A
AC 230 V
Fuse (F901)
250 V 3.15 A
Output to
drive
compressor
(LDU,
LDV,
LDW)
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
100
200
90
180
60
600
50
40
30
20
10
0
-20
500
400
300
0
10 20 30
Temperature( )
OCH472A
40
LED monitor lamp
120
100
80
60
200
40
100
20
0
-10
140
Resistance(k )
700
Fin temperature thermistor(RT64)
160
Discharge temperature thermistor(RT62)
70
Resistance(k )
Resistance(k )
80
LEV connector (CN724)
Signal of outdoor fan
motor (CN931)
Output to drive outdoor
fan motor (CN932)
Discharge temperature
thermistor /RT62
(CN641)
Defrost thermistor
/RT61(CN641)
Ambient temperature
thermistor /RT65
(CN643)
Front side of unit
Outdoor heat exchanger
temperature thermistor
/RT68(CN644)
Fin temperature
thermistor /RT64
(CN642)
AC 230 V
0
10
20
30
40
50
60
70
80
90 100 110 120
Temperature( )
58
0
0
10 20 30 40 50 60 70 80
Temperature( )
11-6-3. Inverter P.C. board
SUZ-KA71VA2.TH
Fuse (F62)
T2.0AL250V
Fuse (F601)
T3.15AL250V
R.V. coil (CN602)
230VAC
Jumper wire for
changing defrost
setting (JS)
Jumper wire for
pre-heat control
setting (JK)
Signal of outdoor fan motor
(CN931)
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)
LED
Output to
drive outdoor
fan motor
(CN932)
Fuse (F901)
T3.15AL250V
Fuse (F880)
T3.15AL250V
LEV connector (CN724)
JP715 (+)
325 - 370 VDC
100
JP30 (-)
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
180
90
160
Discharge temperature thermistor(RT62)
60
600
50
40
30
20
10
-10
OCH472A
0
10 20 30
Temperature( )
40
140
Resistance(k )
70
700
Resistance(k )
Resistance(k )
80
0
-20
Fin temperature thermistor(RT64)
500
400
300
120
100
80
60
200
40
100
20
0
0
10
20
30
40
50
60
70
80
Temperature( )
59
90 100 110 120
0
0
10 20 30 40 50 60 70 80
Temperature( )
11-6-4. Outdoor electronic control P.C. board
SUZ-KA60VA2.TH
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
Discharge temperature thermistor (RT62)
100
500
90
Resistance (k)
600
400
300
50
60
70
80
90
100 110 120
60
50
20
10
0
-20
(
(
(
CN932
20-90V AC
70
30
(
(
(
(
(
(
(
(
(
(
To fan
CN931
motor
5V DC
pulse wave
5V
GND
CN661
Defrost thermistor (RT61)
Temperature ()
80
40
-10
0
10
20
30
Temperature ()
40
Fin temperature thermistor (RT64)
200
180
Resistance (k)
40
12V DC
pulse wave
30
(–)
20
12V
DC
10
CN781
GND (power board)
(–) Rush current relay
(–) R.V. coil
(+)
CN795
(+) LEV
0
15V
15V
0
CN663 Ambient temperature
thermistor (RT65)
CN701
(–) Signal transmission
(+) (To power board)
5V DC pulse wave
(+) CN702
Signal reception
GND (From power board)
(–) 5V DC pulse wave
100
Outdoor heat exchanger
temperature thermistor (RT68)
200
Discharge temperature thermistor (RT62)
Resistance (k)
700
160
140
120
100
80
60
40
20
0
0
10 20 30 40 50 60 70 80
Temperature ()
LED 1
LED 2
CN801
325V DC
~
370V DC
Input
F801
FUSE
3.15A/250V
(
(
OCH472A
CN681
High pressure switch
60
230V AC
50 Hz
Input
(
CN601
Serial signal
Room A
5~10V DC
11-6-5. Noise filter P.C. board
SUZ-KA60VA2.TH
CN901
To electronic CN902 CN903
control
To power To power
P.C. board
board
board
{
{
230V AC
50Hz
Input
{
{
CN912
R.V. coil
230V AC
230V AC
50Hz Output
NR64 VARISTOR
OCH472A
F64 FUSE
2A/250V
F911 FUSE
1A/250V
61
230V
AC50Hz
Output
11-6-6. Outdoor power board
SUZ-KA60VA2.TH
Connect to the compressor
Voltage among phases: 5V to
180V
325-370V DC
Output
(Red)
(+) 1
Connect to the earth
CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V
(–) 3
(White)
CN3
Fin temperature thermistor RT64
reception (From
) Signal
electronic control P.C. board)
5V DC pulse wave
CN5
Primary current detection
(Connect to the noise filter)
Connect to the compressor
Voltage among phases: 5V to 180V
Connect to the earth
325-370V DC
Output
(Red)
(+) 1
CN2
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5V DC pulse wave
(+)2-5(–): Zero cross signal
3-4 : Not used
(+)6-5(–): 15V
(+)7-5(–): 15V
(–) 3
(White)
CN3
Fin temperature thermistor RT64
reception (From
) Signal
electronic control P.C. board)
5V DC pulse wave
CN5
Primary current detection
(Connect to the noise filter)
OCH472A
62
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
SUZ-KA25VA2.TH
OUTDOOR UNIT
(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
SUZ-KA35VA2.TH
NOTE: Turn OFF power supply before disassembling.
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
Screws of
the cabinet
Photo 2
Service
panel
Screw of the
cabinet
Screw of the
service panel
Direction to
remove
Screws of
the cabinet
OCH472A
63
Hooks
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter 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 connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
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 relay panel. (Photo 3)
(5) Remove the inverter assembly. (Photo 4)
(6) Remove the screw of the earth wire and screw of the
T.B.support. (Photo 4)
(7) Remove the relay panel from the inverter assembly.
(8) Remove the inverter P.C. board from the relay panel.
Screws of the
relay panel
Photo 4 (Inverter assembly)
Inverter
P.C. board
Heat sink
3. Removing R.V. coil
Screw of the
T.B.support
T.B.support
(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. (Photo 5)
Relay panel
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
Photo 5
Screw of the
earth wire
R.V. coil
(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.
(Photo 5)
(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.
Discharge temperature thermistor
OCH472A
64
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>
CN932 (Fan motor)
(3) Remove the propeller nut. (Photo 7)
(4) Remove the propeller. (Photo 7)
(5) Remove the screws fixing the fan motor. (Photo 7)
(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 welded 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 welded part of pipes connected with 4-way valve.
(Photo 8)
Defrost thermistor
Photo 7
Propeller
Screws of the outdoor fan motor
Propeller nut
Photo 8
Welded parts of 4-way valve
OCH472A
65
SUZ-KA50VA2.TH
SUZ-KA60VA2.TH
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
(5) Remove the top panel.
(6) Remove the valve cover.
(7) Remove the screws of the cabinet.
(8) Remove the cabinet.
(9) Remove the screws of the back panel.
(10) Remove the back panel.
Screw of the top panel
Screws
of the
cabinet
Screws of the cabinet
Photo 3
Photo 2
Screw of the motor support
Screw of the service panel
Screws
of the
top
panel
Screws
of the
back
panel
Screws
of the
cabinet
Screw
of the
valve
cover
Set screws of the back panel
OCH472A
66
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
and power board
(for SUZ-KA50VA2.TH)
(1) Remove the top panel, cabinet, service panel and back
panel. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors;
<Inverter P.C. board>
CN721 (R.V.coil)
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 relay panel. (Photo 5)
(5) Remove the inverter assembly. (Photo 6)
(6) Remove the screw of the earth wire and screw of the
T.B.support. (Photo 6)
(7) Remove the screw of the PB fixture.
(8) Remove the relay panel from the PB support.
(9) Remove the inverter P.C. board from the inverter assembly.
Photo 4
Screws of the power board assembly
Screws of the relay panel
Photo 5 (SUZ-KA50VA2.TH)
Screws of the
relay panel
(for SUZ-KA60VA2.TH)
(1) Remove the top panel, cabinet, service panel and back
panel. (Refer to 1.)
(2) Disconnect the following connectors;
<Electronic control P.C. board>
CN931 and CN932 (Fan motor)
CN795 (LEV)
CN661 (Discharge temperature thermistor, defrost
thermistor and outdoor heat exchanger
temperature thermistor)
<Noise filter P.C. board>
CN912 (4-way valve)
(3) Remove the compressor connector.
(4) Remove the screws fixing the relay panel.
(5) Remove the inverter assembly.
(6) Disconnect all connectors and lead wires on the electronic
control P.C. board.
(7) Remove the electronic control P.C. board from the inverter
assembly.
(8) Remove the screws fixing the power board assembly.
(9) Disconnect all connectors and lead wires on the power
board.
(10) Remove the power board from the inverter assembly.
(11) Disconnect all connectors and lead wires on the noise filter
P.C. board.
(12) Remove the noise filter P.C. board from the inverter
assembly.
Screws of
the reactor
Photo 6 (SUZ-KA50VA2.TH)
Heat sink
Hook of the
PB support
Inverter P.C.
board
Screw of the
T.B.support
PB support
T.B.support
3. Removing R.V. coil
(1) Remove the top panel, cabinet and service panel. (Refer to 1)
(2) Remove the back panel. (Refer to 1.)
(3) Disconnect the following connectors;
for SUZ-KA50VA2.TH
<inverter P.C. board>
CN721 (R.V. coil)
for SUZ-KA60VA2.TH
<Noise filter P.C. board>
CN912 (R.V. coil)
(4) Remove the R.V. coil. (Photo 11)
OCH472A
67
Hook of the
PB support
Relay panel
Screw of the
PB fixture
Screw of the
earth wire
OPERATING PROCEDURE
PHOTOS
4. Removing the defrost thermistor, discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
Photo 7
Discharge temperature thermistor
(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) Pull out the defrost thermistor from its holder. (Photo 8)
(5) Pull out the discharge temperature thermistor from its
holder. (Photo 7)
(6) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (Photo 8)
(7) Pull out the ambient temperature thermistor from its holder.
(Photo 8)
Photo 8
Outdoor heat
exchanger
temperature
thermistor
Ambient
temperature
thermistor
Defrost
thermistor
5. Removing outdoor fan motor
Photo 9
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Remove the back panel. (Refer to 1.)
(3) Disconnect the following connectors;
for SUZ-KA50VA2.TH
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
Screws of the outdoor fan motor
Propeller
for SUZ-KA60VA2.TH
<Electric control P.C. board>
CN931 and CN932 (Fan motor)
(4) Remove the propeller.
(5) Remove the screws fixing the fan motor.
(6) Remove the fan motor
OCH472A
68
OPERATING PROCEDURE
PHOTOS
6. Removing the compressor and 4-way valve
Photo 10
(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 welded part of the suction and the discharge
pipe connected with compressor. (Photo 11)
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (Photo 10)
Welded parts of 4-way valve
Photo 11
R.V. coil
Welded part
of the discharge pipe
Welded part
of the suction
pipe
7. Removing the reactor
Photo 12
(1) Remove the top panel. (Refer to 1.)
(2) Disconnect the reactor lead wire.
(3) Remove the screws of the reactor, and remove the reactor.
Screws of the reactor
OCH472A
69
SUZ-KA71VA2.TH
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(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
Screws of the
cabinet
Screws of the
cabinet
Photo 2
Screw of the back panel
Screws of the top panel
Screws of the
cabinet
Screws
of the
cabinet
Screws of the
service panel
Screw of
the valve
cover
OCH472A
70
Screws of the
back panel
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>
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 screw of the PB support.
(8) Remove the inverter P.C. board from the relay panel.
Photo 3
Screw of the
relay panel
Inverter P.C
board
Earth wires
Screws of the
PB support
Screws
of the PB
support
Screws of
the relay
panel
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.
Photo 4
Screw of the
R.V. coil
Welded parts of
4-way valve
OCH472A
71
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 welded part of the suction and the discharge
pipe connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (Photo 4)
Screws of the
outdoor fan motor
Welded part of the
discharge pipe
Discharge temperature
thermistor
Welded part of the
suction pipe
OCH472A
72
OCH472A
73
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
cCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Sep. 2011 No.OCH472 REVISED EDITION-A
Distributed in May. 2010 No.OCH472 PDF 4
Made in Japan
New publication, effective Sep. 2011
Specifications subject to change without notice
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