• SUZ-A18VR.TH and SUZ-A24VR.TH are added in
REVISED EDITION-A.
NOTE:
This service manual describes technical data of the
outdoor units.
•As for indoor units SLZ-A09AR.TH, SLZ-A12AR.TH,
SLZ-A18AR.TH, SEZ-A12AR.TH, SEZ-A18AR.TH,
SEZ-A24AR.TH and SEZ-A09CR.W, refer to the service
manual OC302 and OC303.
14. PARTS LIST······················································79
······2
• Please void OC304.
Page 2
1
Heat pump type
Outdoor unit
SUZ-
SLZ-A09AR.TH
SLZ-A12AR.TH
SLZ-A18AR.TH
SEZ-A09CR.W
SEZ-A12AR.TH
SEZ-A18AR.TH
SEZ-A24AR.TH
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
OC302
—
OC303
Indoor unit
Service
Manual No.
Service Ref.
Heat pump
without
electric heater
A12VR.THA09VR.THA24VR.THA18VR.TH
COMBINATION OF INDOOR AND OUTDOOR UNITS
2
Page 3
Refrigerating
oil
Refrigerant
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
Non
Non
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
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO
2
New SpecificationCurrent Specification
The incompatible refrigerating oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigerating oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerating oil are compatible each,
refrigerating oil backs to the compressor through the lower
position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigerating oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigerating oil /Refrigerant
Compressor
2
TECHNICAL CHANGES
INFORMATION FOR THE AIR CONDITIONER WITH R410A 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.
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/ff[Gauge])
3
Page 4
-30 -20 -1001020
30
405060
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(:)
NOTE : The unit of pressure has been changed to MPa on the
R410A toolsCan R22 tools be used?
Gas leak detector
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.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
6.35 mm and 9.52 mm
Description
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
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
No
No
No
Yes
Yes
New
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
No12.7 mm
Wall
thickness
Outside diameter
Pipe
mm
For liquid
For gas
6.35
9.52
12.7
0.8 mm
0.8 mm
0.8 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
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 R410Atools.
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.
2. Refrigerant piping
1 Specifications
Use the refrigerant pipes that meet the following specifications.
• 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.
4
Page 5
Electronic scale for refrigerant charging
Outdoor unit
Refrigerant gas
cylinder
operating valve
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Service port
Gauge manifold
valve (for R410A)
Union
Liquid pipe
Gas pipe
Stop valve
Indoor unit
Charge hose (for R410A)
R410A
Pipe diameter
mm
6.35
9.52
12.7
17
22
26
Dimension of flare nut
R22
17
22
24
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”.
3. Refrigerant oil
Apply the special refrigeration 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.
5
Page 6
3
PART NAMES AND FUNCTIONS
SUZ-A09VR.TH
SUZ-A12VR.TH
OUTDOOR UNIT
SUZ-A18VR.TH
SUZ-A24VR.TH
OUTDOOR UNIT
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
Air inlet
(back and side)
Piping
Drain hose
ACCESSORIES
Drain socket
1
ACCESSORIES
Drain socket
1
Drain cap [33
2
SUZ-A09VR.TH
SUZ-A12VR.TH
1
SUZ-A18VR.TH
SUZ-A24VR.TH
1
2
Air outlet
Drain outlet
6
Page 7
4
Function
Power supply
Outdoor Service Ref.
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/Loww)
Starting current ✽1
Compressor motor current ✽1
Fan motor current
The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition.
Operating conditions vary according to the areas where these units are installed. The following information has been provided
to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
Rated voltage : ±10% (207~253V), 50Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
COOLING
(1) Indoor intake air wet-bulb temperature : W.B. ˚C
(2) Indoor outlet air wet-bulb temperature : W.B. ˚C
(3) Outdoor intake air dry-bulb temperature : D.B. ˚C
(4) Total input : W
Indoor air wet/dry-bulb temperature difference on the side of the chart on page shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
HEATING
(1) Indoor intake air dry-bulb temperature : D.B. ˚C
(2) Indoor outlet air dry-bulb temperature : D.B. ˚C
(3) Outdoor intake air wet-bulb temperature : W.B. ˚C
(4) Total input : W
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1. Attach at least 2 sets of wet-and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of
wet-and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed
is high.
2. Attach at least 2 sets of wet-and-dry-bulb thermometers to the outdoor air inlet.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of the room.
5. Press the EMERGENCY OPERATION switch once to start the COOL(HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT
OUTDOOR UNIT
19
Page 20
20.4
18.9
17.3
15.7
14.2
12.6
11.0
9.4
23.6
21.8
20.0
18.2
16.3
14.5
12.7
10.9
Indoor air Dry-bulb temperature
difference (degree)
Indoor intake air Dry-bulb temperature (
:)
Outdoor intake air Wet-bulb temperature (:)
Outdoor intake air Wet-bulb temperature (:)
Indoor intake air Dry-bulb temperature (:)
SUZ-A09VR.TH
Rated frequency 75Hz
SUZ-A12VR.TH
Rated frequency 76Hz
28.2
26.0
23.9
21.7
19.5
17.4
15.2
13.0
SUZ-A18VR.TH
Rated frequency 65Hz
NOTE:The above curves are for the heating operation without any frost.
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
Input correction factors
The operational frequency of compressor
Correction of Coolingtotal input
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
Input correction factors
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
2.5
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
SUZ-A09VR.TH
SUZ-A12VR.THSUZ-A12VR.THSUZ-A12VR.THSUZ-A12VR.TH
SUZ-A09VR.THSUZ-A09VR.THSUZ-A09VR.TH
SUZ-A18VR.THSUZ-A18VR.THSUZ-A18VR.THSUZ-A18VR.TH
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
<How to operate fixed-frequency operation (Test run operation)>
1. Press the EMERGENCY OPERATION switch to COOL or HEAT mode.
2. Test run operation starts and continue 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 any button on
remote controller.
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/ff[Gauge])
20
Page 21
Outdoor unit current(A)
152050256030
70 (%)
35(˚C)
2
2.5
3
3.5
4
57Hz
32
18
Ambient temperature(˚C) Ambient humidity(%)
SUZ-A12VR.TH
15205025
60
30
70 (%)
35(˚C)
2
3
4
5
6
67Hz
32
18
Outdoor unit current(A)
Ambient temperature(˚C) Ambient humidity(%)
SUZ-A09VR.TH
(MPa [Gauge])
(kgf/F [Gauge])
1832
152050256030
70 (%)
35(˚C)
0.2
0.4
0.6
0.8
1.0
1.2
57Hz
2
4
6
8
10
12
14
1.4
Ambient temperature(˚C) Ambient humidity(%)
Outdoor low pressure
SUZ-A09VR.TH
(MPa [Gauge])
(kgf/F [Gauge])
1832
152050256030
70 (%)
35(˚C)
0.2
0.4
0.6
0.8
1.0
1.2
67Hz
1.4
Ambient temperature(˚C) Ambient humidity(%)
Outdoor low pressure
SUZ-A12VR.TH
2
4
6
8
10
12
14
Outdoor unit current(A)
152050256030
70 (%)
35(˚C)
5.0
6.0
7.0
8.0
9.0
75Hz
32
18
Ambient temperature(˚C) Ambient humidity(%)
SUZ-A18VR.TH
(MPa [Gauge])
(kgf/F [Gauge])
1832
152050256030
70 (%)
35(˚C)
0.2
0.4
0.6
0.8
1.0
1.2
75Hz
1.4
Ambient temperature(˚C) Ambient humidity(%)
Outdoor low pressure
SUZ-A18VR.TH
2
4
6
8
10
12
14
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
SUZ-A09VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2 5101520 25(:)
58Hz
SUZ-A12VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
2 5101520 25(:)
58Hz
SUZ-A18VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
2 5101520 25(:)
58Hz
COOL operation
1 Both indoor and outdoor unit are under the
same temperature/humidity condition.
2 Air flow : High speed
3 Operational frequency : 57Hz(SUZ-A09VR.TH)
67Hz(SUZ-A12VR.TH)
75Hz(SUZ-A18VR.TH)
Dry-bulb temperature
2050
2560
3070
Relative humidity(%)
HEAT operation
Condition indoor: Dry bulb temperature 20.0°C
Condition outdoor: Dry bulb temperature 2,7,15,20.0°C
Wet bulb temperature 14.5°C
Wet bulb temperature 1,6,12,14.5°C
21
Page 22
Air outlet
Air inlet
Wet-and dry-bulb
thermometers
Wet-and dry-bulb
thermometers
BACK VIEW
● SEZ-A09CR.W / SUZ-A09VR.TH
● SEZ-A12AR.TH / SUZ-A12VR.TH
● SEZ-A18AR.TH / SUZ-A18VR.TH
● SEZ-A24AR.TH / SUZ-A24VR.TH
The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition.
Operating conditions vary according to the areas where these units are installed. The following information has been provided
to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
Rated voltage : ±10% (207~253V), 50Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
COOLING
(1) Indoor intake air wet-bulb temperature : W.B.˚C
(2) Indoor outlet air wet-bulb temperature : W.B.˚C
(3) Outdoor intake air dry-bulb temperature : D.B.˚C
(4) Total input : W
Indoor air wet/dry-bulb temperature difference on the side of the chart on page shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
HEATING
(1) Indoor intake air dry-bulb temperature : D.B.˚C
(2) Indoor outlet air dry-bulb temperature : D.B.˚C
(3) Outdoor intake air wet-bulb temperature : W.B.˚C
(4) Total input : W
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1. Attach at least 2 sets of wet-and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of
wet-and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed
is high.
2. Attach at least 2 sets of wet-and-dry-bulb thermometers to the outdoor air inlet.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of the room.
5. Press the TEST button twice to start the COOL(HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT
OUTDOOR UNIT
w The picture is SEZ-A12,18, 24AR.
SEZ-A09CR is similar to SEZ-A12, 18, 24AR.
22
Page 23
NOTE:The above curves are for the heating operation without any frost.
Indoor air Wet-bulb temperature
difference (degree)
Indoor intake air Wet-bulb temperature (:)
Outdoor intake air Dry-bulb temperature (:)
Indoor intake air Wet-bulb temperature (
:)
Outdoor intake air Dry-bulb temperature (:)
7.9
7.4
6.8
6.2
5.7
5.1
SUZ-A09VR.TH
Rated frequency 57Hz
8.4
7.8
7.2
6.6
6.0
5.4
SUZ-A18VR.TH
Rated frequency 80Hz
7.8
7.2
6.7
6.1
5.6
5.0
SUZ-A12VR.TH
Rated frequency 67Hz
8.6
8.0
7.4
6.8
6.2
5.5
SUZ-A24VR.TH
Rated frequency 87Hz
25.2
23.2
21.3
19.4
17.4
15.5
13.6
11.6
Indoor air Dry-bulb temperature
difference (degree)
Indoor intake air Dry-bulb temperature (
:)
Outdoor intake air Wet-bulb temperature (:)
Outdoor intake air Wet-bulb temperature (:)
Indoor intake air Dry-bulb temperature (:)
SUZ-A09VR.TH
Rated frequency 75Hz
22.1
20.4
18.7
17.0
15.3
13.6
11.9
10.2
SUZ-A12VR.TH
Rated frequency 76Hz
24.5
22.6
20.7
18.9
17.0
15.1
13.2
11.3
SUZ-A18VR.TH
Rated frequency 80Hz
25.3
23.3
21.4
19.4
17.5
15.5
13.6
11.7
SUZ-A24VR.TH
Rated frequency 96Hz
23
Page 24
SUZ-A09VR.TH
SUZ-A09VR.THSUZ-A09VR.THSUZ-A09VR.TH
SUZ-A12VR.TH
SUZ-A12VR.THSUZ-A12VR.THSUZ-A12VR.TH
SUZ-A18VR.TH
SUZ-A18VR.THSUZ-A18VR.THSUZ-A18VR.TH
SUZ-A24VR.TH
SUZ-A24VR.THSUZ-A24VR.THSUZ-A24VR.TH
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
Correction of Cooling capacity
Capacity correction factors
The operational frequency of compressor
Correction of Cooling total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
0.0
0.5
1.0
1.5
2.0
1.5
1.0
0.5
0.0
Correction of
Heating total input
Input correction factors
The operational frequency of compressor
050100150(Hz)
2.0
1.5
1.0
0.5
0.0
050100150(Hz)
Correction of Heating capacity
Capacity correction factors
The operational frequency of compressor
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
<How to operate fixed-frequency operation (Test run operation)>
1. Press the TEST button to COOL or HEAT mode.
2. Test run operation starts and continue 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 ON/OFF button on remote controller.
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/ff[Gauge])
24
Page 25
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
SUZ-A09VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
2 5101520 25(:)
58Hz
SUZ-A12VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
2 5101520 25(:)
58Hz
SUZ-A18VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
2 5101520 25(:)
58Hz
58Hz
SUZ-A24VR.TH
Outdoor unit current (A)
Ambient temperature(˚C)
7.0
6.0
5.0
4.0
3.0
2.0
1.0
2 5101520 25(:)
COOL operation
1 Both indoor and outdoor unit are under the
same temperature/humidity condition.
2 Air flow : High speed
3 Operational frequency : 57Hz(SUZ-A09VR.TH)
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.
10-2. R.V. coil control
Heating
Cooling . . . . . . . . . . . . . . . . . OFF
Dry
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
10-3. Relation between main sensor and actuator
SUZ-A09VR.TH SUZ-A12VR.TH
SUZ-A18VR.TH SUZ-A24VR.TH
ON
OFF
41
Page 42
11
Jumper wireChange point
Deforst finish temperature changes from 5: to 8:.
JS
Housing point
SERVICE FUNCTIONS
SUZ-A09VR.THSUZ-A12VR.TH
CHANGE IN DEFROST SETTING
<JS> When the JS wire of the outdoor inverter P.C. board is cut, the defrost temperature is changed.
12-1-1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
12-1-2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after
confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the inverter
control P.C. board or electronic control P.C. board.
3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.
4) When removing the inverter 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 wiring
12-1-3. Troubleshooting procedure
For SLZ/SUZ
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) If the inverter P.C. board or electronic control P.C. board is supposed to be defective, check the copper foil pattern for
disconnection and the components for bursting and discolouration.
4) When troubleshooting, refer to the flow chart on page 43 for SLZ-A09AR.TH, SLZ-A12AR.TH, SUZ-A09VR.TH and
SUZ-A12VR.TH and page 45 for SLZ-A18AR.TH and SUZ-A18VR.TH.
For SEZ/SUZ
1) First, check if the OPERATION lamp on the remote controller is flashing and off to indicate an abnormality.
To make sure, check the ERROR CODE on the remote controller.
2) Before servicing check that the connector and terminal are connected properly.
3) If the inverter P.C. board or electronic control P.C. board is supposed to be defective, check the copper foil pattern for
disconnection and the components for bursting and discolouration.
4) When troubleshooting, refer to the flow chart on page 44 for SEZ-A09CR.W, SEZ-A12AR.TH, SUZ-A09AR.TH and
SUZ-A12AR.TH and page 46 for SEZ-A18AR.W, SEZ-A24AR.TH, SUZ-A18AR.TH and SUZ-A24AR.TH.
When compressor has stopped by over current protection
within 1 minute 3 times in a row after compressor start-up, unit
stops.
When discharge temperature thermistor, fin temperature
thermistor or defrost thermistor shorts or opens during
compressor running, compressor stops.
When nonvolatile memory data cannot be read properly,
compressor stops.
When 13A(SUZ-A09VR.TH)/ 20A(SUZ-A12VR.TH) current flows
into power transistor, compressor stops and restarts 3 minutes
later.
When discharge temperature thermistor exceeds 116:,
compressor stops and restarts 3 minutes later.
(Compressor restarts when discharge temperature thermistor
reads 100: or below.)
When temperature at heat sink exceeds 83: or inverter P.C.
board exceeds 79:, compressor stops and restarts 3 minutes
later.
When indoor coil thermistor exceeds 70:.
When the defrost thermistor exceeds 70: in COOL mode.
When current from power outlet exceeds 8A(SUZ-A09VR.TH)/
9A(SUZ-A12VR.TH), compressor frequency lowers.
When indoor coil thermistor exceeds 55: in HEAT mode,
compressor frequency lowers.
When indoor coil thermistor reads 8: or below in COOL mode,
compressor frequency lowers.
When discharge temperature thermistor exceeds 111:,
compressor frequency lowers.
When discharge temperature has been 50: or below for 20
minutes.
No.
1
2
3
5
6
7
8
10
11
12
13
14
Symptom
LED indication
Detection method
Checkpoint
Outdoor unit
does not
operate
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated
Outdoor unit
operates (at
low
frequency)
Outdoor unit
operates
1-time flash every
2.5 seconds
NOTE:
For abnormality
location, refer to
'Indoor
troubleshooting
check table'.
2-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
1-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
Outdoor power
system
Outdoor
thermistors
Outdoor control
system
Over current
protection
Discharge
temperature
overheat
protection
Fin temperature
thermistor overheat
protection
High pressure
protection
Frequency drop by
current protection
Frequency drop by
high pressure
protection
Frequency drop by
defrosting in COOL
mode
Frequency drop by,
discharge
temperature
protection.
Low discharge
temperature
protection
· Check stop valve.
· Reconnect connector.
· Refer to A "How to check inverter/
compressor" on page 52.
· Refer to G "Check of outdoor
thermistors" on page 54.
· Check stop valve.
· Reconnect connector.
· Refer to A "How to check inverter/
compressor" on page 52.
Replace inverter P.C. board.
· Check refrigerant circuit and
refrigerant amount.
· Refer to G "Check of outdoor
thermistors" on page 54.
· Refer to L "Check of LEV" on page
56.
· Check around outdoor unit.
· Check outdoor unit air passage.
· Refer to I "Check of outdoor fan
motor" on page 55.
· Check refrigerant circuit and
refrigerant amount.
· Check stop valve.
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
outlets are short cycled.
· Refer to L "Check of LEV" on
page 56.
· Check refrigerant circuit and
refrigerant amount.
Refer to A "How to check inverter/
compressor" on page 52.
When the bus-bar voltage of inverter cannot be detected
normally.
Bus-bar voltage
8-time flash
2.5 seconds OFF
Compressor
sinusoidal current
When the waveform of compressor current is distorted.
· Check stop valve.
· Reconnect connector.
· Refer to A "How to check inverter/
compressor" on page 52.
8-time flash
2.5 seconds OFF
PAM protection
When the overcurrent flows into IGBT or when the bus-bar
voltage reaches 300V or more, PAM stops and restarts.
This is not malfunction.
PAM protection will be activated in
the following cases;
1Instantaneous power voltage drop
(Short time power failure)
2When the power supply voltage is
high.
9-time flash
2.5 seconds OFF
Inverter check
mode
When the connector of compressor is disconnected, inverter
check mode starts.
Check if the connector is correctly
connected.
Refer to A "How to check inverter/
compressor" on page 52.
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation. Refer to page 66.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
ON
OFF
2.5-second OFF
0.5-second ON
2.5-second OFF
47
0.5-second ON
Page 48
Indication
Abnormal pointDetecting method
Symptom: Outdoor unit does not operate.
Check points
LED 1
(Red)
LightingTwice Outdoor power system
When the compressor operation has been interrupted by over current
protection continuously three times within 1 minute after start-up, or
when power factor control module protection or DC control protection is
activated three times within 3 minutes after the compressor get started.
• Check the inverter/compressor.
• Replace the outdoor electronic control
P.C. board.
Lighting 7 times Outdoor control system
When the nonvolatile memory data cannot be read properly on the
outdoor electronic control P.C. board.
LED 2
(Yellow)
Indication
Abnormal pointDetecting method
Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later.
Check points
LED 1
(Red)
Lighting
Outdoor heat exchanger
temperature thermistor
When the outdoor heat exchanger temperature thermistor is short or
open while compressor is operating.
• Replace the outdoor electronic control
P.C. board.
• Check the amount of gas and the
refrigerant cycle.
• Check the outdoor unit air passage.
• Check the characteristic of the discharge
temperature thermistor.
• Check the connector. (CN661)
Lighting 3 times
Discharge temperature
thermistor
When a short or open circuit occurs in the discharge temperature
thermistor during compressor operating.
Twice Goes out
Overcurrent protection When overcurrent is applied to the power module.
3 times Goes out
Discharge temperature
overheat protection
When the discharge temperature thermistor detects 116: or above.
(Protection will be released at 100: or below.)
4 times Goes out
Fin temperature
overheat protection
When the fin temperature thermistor detects 87: or above.
• Check the characteristic of the high
pressure protect thermistor.
• Check the connector. (CN661)
5 times
LightingCurrent sensor
When the output from compressor current sensor becomes 25A or
more while the compressor is operating.
• Check if the connection lead wires of com-
pressor are correctly connected.
6 times
• Check if the connection wires between
outdoor electronic control P.C. board and
power board are correctly connected.
Lighting 11 times
Communication error
between P.C. boards
When the communication failure between the outdoor electronic control
P.C. board and power board occurs twice consecutively.
• Check if the connection wires between
noise filter P.C. board and power board are
correctly connected.
Lighting
12 times
Zero cross signal error
When the zero cross signal cannot be detected while the compressor is
operating.
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
• Check the power module.
• Check the inverter/ compressor.
• Check the amount of gas.
• Check the indoor/ outdoor air flow for
short cycle.
• Check the indoor unit air filter for clogging.
• Check the characteristic of the fin
temperature thermistor.
• Check the connector. (CN3)
Lighting 4 times
Fin temperature
thermistor
When a short or open circuit occurs in the fin temperature thermistor
during compressor operating.
P.C. board temperature
thermistor
When a short or open circuit occurs in the P.C. board temperature
thermistor during compressor operating.
LED 2
(Yellow)
Indication
Abnormal pointDetecting method
Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later
Check points
LED 1
(Red)
5 times Goes out
High-pressure protection
When the outdoor heat exchanger temperature thermistor detects 69:
or more.
When high-pressure switch detects 4MPa or more. (MUZ-A26YV)
4 times Goes out
P.C. board temperature
overheat protection
When the P.C. board temperature thermistor detects 70: or above.
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
• Replace the outdoor electronic control
P.C. board.
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
8 times Goes out
Power factor control
module protection
When the overcurrent to power factor controller occurs or the output
voltage from power factor controller becomes 400V or more.
• Check the input voltage.
• Check the inverter.
9 times Goes out
DC voltage protection
When it's detected that DC voltage becomes 200V or less, or reaches
400V or more.
• Check the voltage of power supply.
• Check the inverter.
13 times Goes out
Fan motor protection
When the fan motor current is 2A or more, or when the abnormality is
detected in the feedback signal from fan motor.
• Check the outdoor fan motor.
• Check the fan motor connector.
LED 2
(Yellow)
11 times Goes out
Connectivity of indoor
and outdoor unit
When the unusual signal is transmitted from the indoor unit.
• Check if the indoor unit can be connected
with the outdoor unit.
(Red)
OnceLighting Current protection
Twice Lighting
Twice Lighting Defrosting in cooling
3 times Lighting
4 times Lighting
5 times Lighting
LED 1
(Red)
Lighting
Lighting
9 times
LED 2
(Yellow)
Indication
LED 2
(Yellow)
5 times
11 times
Lighting
Abnormal pointDetecting method
High-pressure protection
Discharge temperature
protection
Low discharge
temperature protection
High-pressure protection
Abnormal pointDetecting method
Defrost thermistor
Initial-setting
Service mode
Symptom: Outdoor unit operates (The compressor operates at reduced frequency)
When the outdoor unit input current exceeds 14.5A.
When the indoor gas pipe temperature exceeds 55˚C during heating.
When the indoor gas pipe temperature falls to 6˚C or below during cooling.
When the discharge temperature exceeds 104˚C.
When the state with low discharge temperature of which 37˚C or below
in COOL and 35
When outdoor heat exchanger temperature thermistor detects 58: or
more.
When a short or open circuit occurs in the defrost thermistor during
heating.
When the initial-setting information from an indoor unit is now being read.
When the unit operates EMERGENCY OPERATION.
˚C
or below in HEAT lasts for 20 minutes.
Symptom: Outdoor unit operates.
These symptoms do not mean any
abnormality of the product, but check
the following points.
• Air filter clogging
• Amount of gas
• Short cycle of indoor/outdoor air flow
• Check the characteristic of the defrost
• Check the connector. (CN661)
Check points
Check points
temperature thermistor.
49
Page 50
12-2-2. Trouble criterion of main parts (1)
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Abnormal
Open or
short-circuit
Normal
39 " ~ 50 "
Part nameFigureCheck method and criterion
Outdoor fan motor (MF)
INNER FUSE
152i : CUT OFF
0
5
R.V. coil (21S4)
Expansion valve (LEV)
Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)
WHT – BLK
BLK – RED
Abnormal
Open or
short-circuit
Normal
Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)
Normal
1.90 k" ~ 2.38 k"
Abnormal
Open or short-circuit
Measure the resistance with a tester.
(Part temperature : –15˚C ~ 40˚C)
Measure the resistance with a tester. (Part temperature –15˚C ~ 40˚C)
Color of lead wire
Color of lead wire
Discharge temperature
thermistor (RT62)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)
Normal
150 k" ~ 600 k"
30 k" ~ 180 k"
Abnormal
Open or short-circuit
Normal
5 k" ~ 65 k"
Abnormal
Open or short-circuit
Defrost thermistor
(RT61)
Fin temperature
thermistor (RT64)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)
NormalAbnormal
Open or short-circuit
Ambient temperature
thermistor (RT65)
LEV
WHT
6
RED1
ORN4
YLW5
BRN2
BLU3
WHT
RED
BLK
299 " ~ 374 "
242 " ~ 304 "
Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)
Compressor (MC)
U-V
U-W
V-W
Abnormal
Open or
short-circuit
Normal
0.42 " ~ 0.53 "
1.31 " ~ 1.66"
SUZ-A12VR.THSUZ-A09VR.TH
23
W
U
V
1
WHT
RED BLK
FUSE
SUZ-A09VR.TH
SUZ-A12VR.TH
50
Page 51
W
U
V
WHT
RED
BLK
LEV
WHT
RED
YLW
BRN
ORN
BLU
U
RED
WHT
BLK
V
W
(W)
(V)
(U)
12-2-2. Trouble criterion of main parts (2)
SUZ-A18VR.TH
SUZ-A24VR.TH
Part nameCheck method and criterion
Defrost thermistor (RT62)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT61)
Fin temperature thermistor
(RT65)
Measure the resistance using a tester.
(Part temperature : -10°C ~ 40°C)
Measure the resistance using a tester, after warming up the thermistor by holding by hand.
(Part temperature : 20°C ~ 40°C)
Measure the resistance using a tester.
(Part temperature : 10°C ~ 40°C)
Normalabnormal
5kΩ ~ 55kΩ
Open or short-circuit
Normalabnormal
100kΩ ~ 250kΩ
Opened or short-circuit
Normalabnormal
25kΩ ~ 100kΩ
Open or short-circuit
Compressor (MC)
Outdoor fan motor (MF)
R. V. coil (21S4)
Expansion valve (LEV)
Measure the resistance between terminals using a tester.
(Winding temperature : -10°C ~ 40°C)
Normal
0.40Ω ~ 0.49Ω
abnormal
Open or short-circuit
Measure the resistance between lead wires using a tester.
(Part temperature : -10°C ~ 40°C)
Color of
lead wire
Normal
RED - BLK
BLK - WHT
13.4Ω ~ 16.4Ω
WHT - RED
Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C)
Normalabnormal
2.6kΩ ~ 3.3kΩ
Open or short-circuit
Measure the resistance using a tester.(Part temperature : -10°C ~ 40°C)
Color of lead wire
Normal
WHT - RED
RED - ORN
YLW - BRN
37.4Ω ~ 53.9Ω
BRN - BLU
abnormal
Open or
short-circuit
(Not including
WHT - ORN)
Abnormal
Open or
short-circuit
51
Page 52
●With the connector between compressor and power transistor
module disconnected, activate the inverter and check if the inverter
is normal by measuring the balance of voltage between terminals.
<< Operation method>>
Start cooling or heating operation by pressing the EMERGENCY OPERATION switch
on the indoor unit. (test-run mode : refer to page 20 for SLZ/SUZ and 24 for SEZ/SUZ.)
NOTE 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of inverter P.C. board flashes 9 times.
●Disconnect the connector (CN61) between compressor and
power transistor module, and measure the resistance between
terminals on the power transistor module.
<<Judgement>>
Infinite ["]···········Normal
0~dozens of ······Abnormal (short)
Output voltage [V]
115V
w Measure AC voltage between
the lead wires at 3 points.
w Measure the resistance between
the lead wires at 3 points
ohmmeter indication
Normal
(infinite)
Abnormal
(0~dozens of ")
X1
"
X1
"
LED
Inverter P.C. board
9-time flash
2.5-second OFF
Flashing
[SUZ-A09VR.TH SUZ-A12VR.TH]
(Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes 5-time.
(Only SEZ-A09CR.W, SEZ-A12AR.TH) Error code “4210” displays on remote controller.
Outdoor unit does not operate.
A
How to check inverter/ compressor
Disconnect the connector (CN61)
between compressor and power
transistor module (IPM).
Check the voltage
between terminals.
Are the voltages
balanced?
Yes
Check the
compressor.
B
Check of open phase
See B “Check of open phase” on page 52.
No
Check the resistance of power transistor
module.
See D “Check of compressor” on page 53.
See C 'Check of power transistor module' on page 52.
Is the resistance
infinite?
No
(0~several
Yes
Replace the inverter P.C.
board.
")
Replace the inverter P.C.
board and compressor.
C
Check of power transistor module
52
Page 53
D
Check of compressor
Start
[SUZ-A09VR.TH SUZ-A12VR.TH]
E "Check of compressor
winding" on page 53.
No
Replace the compressor.
Is the compressor normal?
Yes
F "Check of compressor
operation time" on page
53. Does the compressor
operate continuously?
No
Is the compressor
operation time more than
10 seconds?
Yes
Ok
E
Check of compressor winding
Check the refrigerant circuit.
● Disconnect the connector (CN61) between compressor and power
transistor module, and measure the resistance between the
compressor terminals.
Measurement point at 3 points of lead wire.
at 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgement>>
Refer to page 50.
0["] ···············Abnormal [short]
Infinite["] ·······Abnormal [open]
NOTE 1. Be sure to zero the ohmmeter before measurement.
2. Winding resistance for each phase at 20:.
Refer to page 6 and 7.
No
Yes
Ohmmeter indication
"
X1
"
X1
"
X1
Replace the compressor.
WHT
23
Normal
V
(1~several ")
Compressor motor
Abnormal
(0" ····· short)
Abnormal
(infinite····· open)
RED BLK
1
W
U
Check of compressor operation time
F
●Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<<Operation method>>
[For SLZ/SUZ]
Start heating or cooling operation by pressing the EMERGENCY
OPERATION switch on the indoor unit. (Test-run mode)
[For SEZ/SUZ]
Start heating or cooling operation by pressing the TEST button
twice on the remote controller. (Test-run mode)
<<Measurement>>
Measure the time from the start of outdoor fan running to the
stop of the inverter due to over current.
<<Judgement>>
For reference
0~10 seconds·····················Abnormal (compressor short)
10~60 seconds···················Abnormal (compressor lock-out)
60 seconds~5 minutes·······Abnormal (refrigerant circuit defect)
more than 5 minutes···········Normal
53
0 sec.
10 sec.
60 sec.
5 min.
<Judgement scale>
Outdoor fan starts
Abnormal
(Compressor winding short or layer short)
Abnormal
(Compressor lock-out)
Abnormal
(Refrigerant circuit defect, etc.)
Normal
Page 54
Measure the
resistance
between CN641
1 and 2.
Measure the
resistance
between CN642
1 and 2.
No
Yes
Replace the
thermistor
except RT64.
In case of RT64,
replace the
inverter P.C.
board.
Replace the inverter
P.C. board.
Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board.
(Check the characteristics of each thermistor.)
1 Reconnect the
connectors CN641 ,
CN642 and CN643.
2 Disconnect the
connector between
the compressor and
power transistor
module.
Defrost thermistor RT61
Measure the
resistance
between CN641
3 and 4.
[SLZ]
Turn ON the
power supply and
press the
EMERGENCY
OPERATION
switch.
[SEZ]
Turn ON the
power supply and
press the TEST
button twice.
Discharge
temperature
thermistor RT62
Fin temperature
thermistor RT64
Does the
resistance of the
thermistor have the
characteristics on
page 66?
No
Yes
Does the unit
operate 10 minutes
or more?
Is LED of the
inverter P.C. board
flashes 5 times?
Reconnect the
connector or
connecting wire.
Yes
No
Measure the
resistance
between CN643
1 and 2.
Ambient
temperature
thermistor RT65
[SUZ-A09VR.TH SUZ-A12VR.TH]
(Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes 6-time.
(Only SEZ-A09CR.W, SEZ-A12AR.TH) Error code “5102” and “OC” displays on remote controller.
The thermistors in the outdoor unit are abnormal.
G
Check of outdoor thermistors
Check of R.V. coil
H
Unit operates COOL mode even if it is set to HEAT mode.
w First of all, measure the resistance of R.V. coil to check if the coil is defective (refer to page 50).
w 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.
Disconnect connector (CN61) between
compressor and power transistor
module.
[SLZ]
Turn ON the power supply and press the
EMERGENCY OPERATION switch
(HEAT switch).
[SEZ]
Turn ON the power supply and press the
TEST button twice (HEAT mode).
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector (CN61) between
compressor and power transistor
module.
[SLZ]
Turn ON the power supply and press the
EMERGENCY OPERATION switch
(COOL switch).
[SEZ]
Turn ON the power supply and press the
TEST button twice (COOL mode).
Is there 230V AC between CN7211 and
2 on the power P.C. board 3 minutes after
the power supply is turned ON?
Replace the 4-way valve.
Is there 230V AC between CN7211 and
2 on the power P.C.board 3 minutes after
the power supply is turned ON?
•Defective R.V. coil
•Defective 4-way valve
Yes
No
54
No
Power P.C. board
(soldered side)
Yes
Replace the
power P.C. board.
CN721
Replace the
power P.C. board.
Page 55
Outdoor fan motor does not operate.
Replace the indoor
controller board.
Is there voltage 230V
AC between indoor
terminal block 2 and
N?
Replace the
outdoor fan motor.
There voltage 230V AC
between outdoor terminal
block 2 and N?
Is the resistance of fan
motor normal?
3 minutes after power
ON, is there voltage
230V AC between
CN771 2 and 3 on the
power P.C. board?
Disconnect the connector CN771 on the power P.C. board.
Disconnect the connector (CN61) between compressor and power transistor module.
[SLZ]
Turn ON the power supply and press the EMERGENCY OPERATION switch.
[SEZ]
Turn ON the power supply and press the TEST button twice.
Yes
Yes
Yes
No
No
CN771
Power P.C. board
1
2
3
Fan
motor
Outdoor terminal block
3
N
2
Check the resistance of fan motor. (Refer to page 50.)
Replace the
power P.C. board.
Rectify indoor/ outdoor
connecting wire.
No
Replace the outdoor
fan motor.
No
Yes
Indoor/ outdoor
connecting
wire
Replace the indoor
controller board.
Disconnect the connector (CN61) between compressor
and power transistor module.
[SLZ]
Turn ON the power supply and press the EMERGENCY
OPERATION switch.
[SEZ]
Turn ON the power supply and press the TEST button twice.
Check the electric
parts in main circuit.
OK.
If flash, refer to
page 47.
There voltage of 230V
AC between outdoor
terminal block 2 and N?
3 minutes after power
ON, is there voltage
280V ~ 370V DC
between LD61A (+)
and LD66A (–) on the
inverter P.C. board?
(Refer to page 66.)
Dose LED on the inverter
P.C. board light up or
flash? (Refer to page 66.)
Outdoor terminal block
3
N
2
Yes
Yes
Yes
No
No
No
Yes
No
Indoor/ outdoor
connecting
wire
Replace the inverter
P.C. board.
LD66A
LD61A
(–)
(+)
280V~370V DC
Inverter P.C. board
(Patern side)
Is there voltage 230V AC
between indoor terminal
block 2 and N?
Rectify indoor/ outdoor
connecting wire.
I
Check of outdoor fan motor
[SUZ-A09VR.TH SUZ-A12VR.TH]
Inverter does not operate.
Check of power supply
J
55
Page 56
Outdoor unit does not operate at all or stops immediately due to over current.
Replace the power P.C. board.
When the current-limiting resistor is open, the rush current limiting relay may not work properly.
Does current limiting resistor (R64) detect 10"?
No ∞
Yes
OK
Start
Replace the LEV.
With remote controller set toward the indoor unit, press
the OPERATE/ STOP(ON/ OFF) button and confirm one
beep tone.
LEV operates in full-opening
direction.
Is LEV properly fixed to the
expansion valve?
Ok
Do you hear the expansion
valve "click, click·······"?
Do you feel the expansion
valve vibrate on touching it ?
Does the resistance of LEV
have the characterictics on
page 50?
Measure each voltage between connector pins
of CN724 on the inverter P.C. board.
1.Pin3(-) Pin1(+)
2.Pin4(-) Pin1(+)
3.Pin5(-) Pin1(+)
4.Pin6(-) Pin1(+)
Is there about 3~5V AC between each?
NOTE: Measure the voltage by an analog tester.
No
Yes
Yes
Yes
No
Replace the
expansion valve.
Yes
No
No
Properly fix the LEV to the
expansion valve.
Replace the
inverter P.C. board.
NOTE : After check of LEV, do the undermentioned
operations.
1. Turn OFF the power supply and
turn ON again.
2. Press the RESET button on the remote
controller.
Turn ON the power supply.
1 During pressing both the OPERATION SELECT
button and the TOO COOL button on the remote
controller, press the RESET button.
2 First, release the RESET button.
(After 3 seconds, confirm all displays of the remote
controller.)
3 Then release the OPERATION SELECT button and
the TOO COOL button.
1 During pressing both the OPERATION SELECT
button and the TOO COOL button on the
remote the controller, press the RESET button.
2 First, release the RESET button.
(After 3 seconds, confirm all displays of the
remote controller.)
3 Then release the OPERATION SELECT button
and the TOO COOL button.
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
ON/OFF
TOO
WARM
TOO
COOL
h
Start
Replace the inverter P.C. board.
Replace the LEV coil.
Disconnect the connector
CN724 is there normal resistance to LEV coil?
Yes
Turn on power supply to the outdoor unit after checking LEV coil is mounted to
the LEV body securely.
No
Normal
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Yes
No
Check of current limiting resistor
K
(Only SLZ-A09AR.TH, SLZ-A12AR.TH) Heating/Cooling does not operate.
Check of LEV (Expansion valve)
L
[SUZ-A09VR.TH SUZ-A12VR.TH]
(Only SEZ-A09CR.W, SEZ-A12AR.TH) • When cooling, heat exchange of non-operating indoor unit frosts.
Check of LEV (Expansion valve)
L
• When heating, non-operating indoor unit get warm.
56
Page 57
w Short circuit of JPG and JPS on the indoor
controller board enables self-check to be
displayed in 3 seconds.
As for indoor unit SLZ type, refer to service manual OC302.
No
Replace the
indoor/ outdoor
connecting wire.
Is there voltage approximate 280V DC between
LD61A (+) and LD66A (–) on the inverter P.C.
board arter 3 minutes?
Turn OFF the power supply and then turn ON
again.
Press EMERGENCY OPERATION switch.
There approximate 230V AC between outdoor
terminal block 2 and N?
w4 Replace the inverter P.C.
board.
Does the right side of OPERATION INDICATOR
lamp blink quickly?
w2 Mis-wiring may damage indoor controller
board during the operation. Be sure to
confirm the wiring is correct before the
operation starts.
Replace the indoor
controller board.
No
Replace the indoor/ outdoor connecting wire.
Release the failure mode. w3
Yes
Yes
A
B
Turn OFF the power supply.
Disconnect the indoor/ outdoor connecting wire.
Short-circuit indoor terminal block N and 3.
Turn ON the power supply.
During pressing both the OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press the RESET button.
At first, release the RESET button.
And release the other two buttons since all LCD in
operation display section of the remote controller is
displayed after 3 seconds.
Transmit the signal of remote controller, pressing
OPERATE/STOP (ON/OFF) button on the remote
controller.
(The above procedure allows OPERATION INDICATOR
lamp to indicate the failure-mode.)
Reconnect the indoor/ outdoor connecting wire.
Remove the short-circuit between indoor terminal block N
and 3.
Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
Is there amplitude of 5 to 10V DC between outdoor
terminal block N and 3 after 3 minutes (for confirmation of
serial signal)?
1. Turn OFF the power supply.
2. Disconnect the connector (CN61) between the
compressor and the power transistor module.
3. Turn ON the power supply.
4. Press the EMERGENCY OPERATION switch.
No
Yes
No
Yes
(light up or OFF)
Is mis-wiring
indicated when
the contactor
(52C) on the
indoor controller
board turns ON
3 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press the EMERGENCY
OPERATION switch.
B
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on receiving
section of
the indoor
unit.
w3 Be sure to release the failure-mode
recall function after checking.
w4 Be careful to the residual voltage of smoothing capacitor.
Procedure of release of failure-mode.
1 Press the EMERGENCY
OPERATION switch.
2 Turn OFF the power supply.
3 Press the RESET button on the
remote controller.
Start
No
• Turn ON the power supply.
•
Press once EMERGENCY OPERATION switch.
Is there any mis-wiring, poor contact,
or wire disconnection? w2
Make them sure.
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Yes
Is there 230V AC between outdoor terminal
block 2 and N?
No
Replace the
indoor/ outdoor
connecting wire.
A
•The following indication
applies regardless of shape
of the indicator.
OPERATION INDICATOR lamp
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
ON/OFF
TOO
WARM
TOO
COOL
h
[SUZ-A09VR.TH SUZ-A12VR.TH]
(Only SLZ-A09AR.TH, SLZ-A12AR.TH) When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn’t operate.
N
How to check mis-wiring
57
Page 58
Check if there is amplitude of 5 to 10V DC between
outdoor terminal block N and 3 (for confirmation of serial
signal) and if there is 230V AC between 2 and N.
· Turn OFF inverter-controlled lighting equipment.
· Turn OFF the power supply and then turn ON again.
· Press the TEST button twice.
w Short circuit of JPG and JPS on the indoor
controller board enables self-check to be
displayed in 3 seconds.
As for indoor unit SEZ type, refer to service manual OC303.
Is there voltage approximate 280V DC between
LD61A (+) and LD66A (–) on the inverter P.C.
board arter 3 minutes?
Is mis-wiring indicated when the contactor (52C) on
the indoor controller board turns ON 3 minutes later?
Turn OFF the power supply and then turn ON
again.
Press the TEST button twice.
After 3 minutes, is there approximate 230V AC
between outdoor terminal block 2 and N?
w2 Replace the inverter P.C.
board.
Replace the indoor/ outdoor connecting wire.
1. Turn OFF the power supply.
2. Disconnect the connector (CN61) between the
compressor and the power transistor module.
3. Turn ON the power supply.
4. Press the TEST button twice.
No
Yes
No
Yes
Yes
No
· Reinstall either the unit or the
light each other away.
· Exchange the indoor controller
board.
w2 Be careful to the residual voltage of smoothing capacitor.
Start
No
• Turn ON the power supply.
• Press once TEST button twice.
Is there any mis-wiring, poor contact,
or wire disconnection? w2
Make them sure.
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF) on
OPERATION lamp on remote controller. w
[SUZ-A09VR.TH SUZ-A12VR.TH]
(Only SEZ-A09CR.W, SEZ-A12AR.TH) ERROR CODE “6800” displays on remote controller.
Outdoor unit doesn’t operate.
N
How to check mis-wiring
58
Page 59
No
No
Yes
Yes
Yes
No
Yes
No
Start
Disconnect the terminal of the compressor.
3 minutes after turning on the power supply, start
EMERGENCY OPERATION.
Is output balanced?
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
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage
COOL: 150V(48Hz) HEAT: 170V(64Hz)
Is voltage output? W
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?
Is the input voltage to the outdoor electronic
control P.C. board 370V or more?
Reconnect the lead wire of compressor to former, and
turn on power supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Replace the
compressor.
Replace the power board.
W • After the outdoor fan starts running, wait for 1 minutes or more before
measuring the voltage.
•The output voltage values have the tolerance of i20%.
[SUZ-A18VR.TH SUZ-A24VR.TH]
(Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes 5-time.
(Only SEZ-A18AR.TH, SEZ-A24AR.TH) Error code “4210” displays on remote controller.
Outdoor unit does not operate.
• When heating, room does not get warm.
• When cooling, room does not get cool.
OO
Check of inverter/ compressor
LED display:
LED1LED2
LightingLighting
Lighting
Twice
Twice
Goes out
59
Page 60
[SUZ-A18VR.TH SUZ-A24VR.TH]
(Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes 6-time.
(Only SEZ-A18AR.TH, SEZ-A24AR.TH) Error code “5102” and “OC” displays on remote controller.
• When thermistor is abnormal. (When the LED display is a table below.)
PP
Check of outdoor thermistors
Start
Disconnect the connector in the electronic control P.C. board (see below table), and
measure the resistance of thermistor. Is the thermistor normal?
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?
Yes
Normal
Thermistor
Discharge temperature thermistor
Defrost thermistor
Outdoor heat exchanger temperature thermistor
Fin temperature thermistor
Symbol
RT61
RT62
RT68
RT65
No
Replace the outdoor electronic
control P. C. board.
Connector, Pin No.
Between CN661 pin3 and pin4
Between CN661 pin1 and pin2
Between CN661 pin7 and pin8
Between CN3 pin1 and pin2
Yes
Replace the thermistor.
60
Page 61
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Start
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?
Turn off power supply of indoor and outdoor unit.
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.
Replace the 4-way valve.
Replace the noise filter P.C. board.
Replace the R.V. coil.
Is there voltage 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-)?
Replace the electronic
control P.C. board.
Disconnect the connector
CN912 in noise filter P. C.
board. Is there normal
resistance to R.V. coil?
Start
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?
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.
Replace the 4-way valve.
Replace the noise filter P.C. board.
Is there voltage 12V DC
between the connector CN781
pin 5 (+) and pin 3 (-)? W
Replace the outdoor electronic control P.C. board.
W If the connector CN912 is not connected or R.V. coil is open, voltage
occurs between terminals even when the control is OFF.
• When heating operation does not work.
• When cooling operation does not work.
The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting)
QQ
Check of R.V. coil
[SUZ-A18VR.TH SUZ-A24VR.TH]
61
Page 62
Yes
Yes
Yes
No
No
(Fixed to either 5V or 0V DC)
Start
Check the connection between the
connector CN931 and CN932.
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 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
Is the resistance between each terminal
of outdoor fan motor normal?
Does the outdoor fan motor rotates smoothly?
Does the voltage between each terminal become 5V DC and 0V DC
repeatedly?
Replace the outdoor DC fan motor.
Replace the outdoor electronic control P.C. board.
[SUZ-A18VR.TH SUZ-A24VR.TH]
• Fan motor does not operate or stops operating shortly after starting the operation.
RR
Check of outdoor fan motor
62
Page 63
Outdoor unit does not operate. (LED display: display OFF)
Turn on power supply.
No
Yes
Yes
No
No
Yes
No
Yes
Yes
No
Replace the power board.
Start
Check the connecting of parts of main power supply circuit.
Is there voltage of 230V AC in the
power supply terminal block?
Is the output voltage from the noise
filter P.C. board 230V AC?
Is the input voltage to the outdoor
electronic control P.C. board 325V DC?
Check the power supply cable.
Replace the outdoor electronic control
P.C. board.
Replace the noise
filter P.C. board.
Is fuse (F912) blown?
Is the input voltage to the power board
230V AC?
Replace the fuse.
Replace the reactor.
SS
Check of power supply
[SUZ-A18VR.TH SUZ-A24VR.TH]
• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit get warm.
TT
Check of LEV
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Replace the LEV coil.
Start
No
No
LED display:
LightingLighting
LED1LED2
Yes
Yes
Replace the outdoor electronic
control P. C. board.
Normal
63
Page 64
w Short circuit of JPG and JPS on the indoor
controller board enables self-check to be
displayed in 3 seconds.
As for indoor unit SLZ type, refer to service manual OC302.
Replace the
indoor/ outdoor
connecting wire.
Does the right side of OPERATION INDICATOR
lamp blink quickly?
w2 Mis-wiring may damage indoor controller
board during the operation. Be sure to
confirm the wiring is correct before the
operation starts.
Replace the indoor
controller board.
No
Release the failure mode. w3
Yes
Yes
A
B
Turn OFF the power supply.
Disconnect the indoor/ outdoor connecting wire.
Short-circuit indoor terminal block N and 3.
Turn ON the power supply.
During pressing both the OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press the RESET button.
At first, release the RESET button.
And release the other two buttons since all LCD in
operation display section of the remote controller is
displayed after 3 seconds.
Transmit the signal of remote controller, pressing
OPERATE/STOP (ON/OFF) button on the remote
controller.
(The above procedure allows OPERATION INDICATOR
lamp to indicate the failure-mode.)
Reconnect the indoor/ outdoor connecting wire.
Remove the short-circuit between indoor terminal block N
and 3.
Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
Is there amplitude of 5 to 10V DC between outdoor
terminal block N and 3 after 3 minutes (for confirmation of
serial signal)?
(light up or OFF)
Is mis-wiring
indicated when
the contactor
(52C) on the
indoor controller
board turns ON
3 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press the EMERGENCY
OPERATION switch.
B
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on receiving
section of
the indoor
unit.
w3 Be sure to release the failure-mode
recall function after checking.
Procedure of release of failure-mode.
1 Press the EMERGENCY
OPERATION switch.
2 Turn OFF the power supply.
3 Press the RESET button on the
remote controller.
Start
No
• Turn ON the power supply.
•
Press once EMERGENCY OPERATION switch.
Is there any mis-wiring, poor contact,
or wire disconnection? w2
Make them sure.
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Yes
Is there 230V AC between outdoor terminal
block 2 and N?
No
Replace the
indoor/ outdoor
connecting wire.
A
Is there 325V DC between CN801 1 and 3 on the
outdoor electronic control P.C. board?
Replace the outdoor
electronic control P.C.
board.
Yes
No
No
Check of power
supply.
•The following indication
applies regardless of shape
of the indicator.
OPERATION INDICATOR lamp
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
ON/OFF
TOO
WARM
TOO
COOL
h
[SUZ-A18VR.TH SUZ-A24VR.TH]
(Only SLZ-A18AR.TH, SLZ-A24AR.TH) When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
UU
How to check mis-wiring and serial signal error (when outdoor unit does not work)
Outdoor unit doesn’t operate. (LED display: Both LED1 and LED2 lighting)
64
Page 65
Check if there is amplitude of 5 to 10V DC between
outdoor terminal block N and 3 (for confirmation of serial
signal) and if there is 230V AC between 2 and N.
· Turn OFF inverter-controlled lighting equipment.
· Turn OFF the power supply and then turn ON again.
· Press the TEST button twice.
w Short circuit of JPG and JPS on the indoor
controller board enables self-check to be
displayed in 3 seconds.
As for indoor unit SEZ type, refer to service manual OC303.
Is mis-wiring indicated when the contactor (52C) on
the indoor controller board turns ON 3 minutes later?
Yes
No
· Reinstall either the unit or the
light each other away.
· Exchange the indoor controller
board.
Start
No
• Turn ON the power supply.
• Press once TEST button twice.
Is there any mis-wiring, poor contact,
or wire disconnection? w2
Make them sure.
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF) on
OPERATION lamp on remote controller. w
Is there 325V DC between CN801 1 and 3 on the
outdoor electronic control P.C. board?
Replace the outdoor
electronic control P.C.
board.
Yes
No
Check of power
supply.
[SUZ-A18VR.TH SUZ-A24VR.TH]
(Only SEZ-A18AR.TH, SEZ-A24AR.TH) ERROR CODE “6800” displays on remote controller.
UU
How to check mis-wiring and serial signal error (when outdoor unit does not work)
Outdoor unit doesn’t operate. (LED display: Both LED1 and LED2 lighting)
65
Page 66
-20 -10010203040
0
10
20
30
40
50
60
70
80
90
100
Temperature(:)
Ambient temperature thermistor(RT65)
Defrost thermistor(RT61)
Temperature(:)
Discharge temperature thermistor(RT62)
0 102030405060708090100110120
0
100
200
300
400
500
600
700
0 1020304050607080
0
20
40
60
80
100
120
140
160
180
200
Temperature(:)
Fin temperature thermistor(RT64)
Resistance(k")
Resistance(k")
Resistance(k")
SUZ-A09VR.TH SUZ-A12VR.TH
Inverter P.C. board
Back side of unit
(Refer to page 52.)
LD66A
280V ~ 370V DC
LD61A
230V AC
Jumper wire for change in defrost setting (JS)
(Refer to page 42.)
LED monitor
lamp
Output to drive
compressor
(LDU,LDV,LDW)
Front side of unit
Discharge temperature
thermistor (RT62)
Connecting
Defrost thermistor (RT61)
(CN641)
wire with
power P.C.
board
(CN725)
(CN642)
Ambient temperature
thermistor (RT65)
Fin temperature
thermistor (RT64)
66
(CN643)
LEV
connector
(CN724)
Connector
for indoor/
outdoor
communi-
Zero cross
signal
connector
(CN800)
cation
(CN601)
Page 67
SUZ-A09VR.TH SUZ-A12VR.TH
Power P.C. board
Back side of unit
Connecting wire with
inverter P.C. board
(CN726)
R.V. coil
(CN721)
Front side of unit
230V AC
Output to drive
outdoor fan
motor (CN771)
230V AC
230V AC
67
Page 68
SUZ-A18VR.TH SUZ-A24VR.TH
-20 -10 0 10 20 30 40
100
90
80
70
60
50
40
30
20
10
0
0 1020304050607080
200
180
160
140
120
100
80
60
40
20
0
Resistance (k')
Resistance (k')
Temperature (;)
Temperature (;)
Defrost temperature thermistor (RT62)
Outdoor heat exchanger temperature thermistor (RT68)
Fin temperature thermistor (RT65)
0 102030405060708090100110120
700
600
500
400
300
200
100
0
Resistance (k')
Temperature (;)
Discharge temperature thermistor (RT61)
Electronic control P.C. board
LED 1
LED 2
(
CN932
20-90V AC
(
To fan
motor
5V DC
pulse wave
CN931
GND
5V
(
Defrost thermistor (RT62)
(
Discharge temperature thermistor (RT61)
(
CN661
Outdoor heat exchanger
temperature thermistor (RT68)
5V DC pulse wave
(
(From power board)
5V DC pulse wave
CN701
Signal transmission
(To power board)
(+)
(+)
(
GND
(–)
(
CN702
Signal reception
DC
(
Rush current relay
GND (power board)
15V
15V
(–)
(–)
12V
CN781
R.V. coil (–)
(+)
pulse wave
LEV
(
(+)
(
(
CN795
12V DC
(–)
CN601
325V DC
~
370V DC
Input
F801
FUSE
3.15A/250V
68
(+)
(
(–)
CN601
Serial signal
5~10V DC
Page 69
SUZ-A18VR.TH SUZ-A24VR.TH
Noise filter P.C.board
CN901
Electronic
CN912
R.V. coil
230V AC
230V AC
50Hz Output
control
board
{
{
CN902 CN903
Power board
{
{
230V AC
50Hz
Input
F911 FUSE
1A/250V
F912 FUSE
3.15A/250V
NR63 VARISTOR
69
Page 70
SUZ-A18VR.TH SUZ-A24VR.TH
Power board
325-370V DC
Output
(+)
(–)
(Red)
1
3
(White)
Connect to the compressor
Voltage among phases: 5V to 180V
CN3
Fin temperature thermistor RT65
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
Connect to
the earth
Signal
)
reception
(From
electronic
control P.C.
board)
5V DC
pulse wave
CN5
Primary current detection
(Connect to the noise filter)
70
Page 71
13
(1) Slide the sleeve and check if there is a locking lever or not.(2) The terminal with this connector is a terminal
with lock mechanism
1Slide the sleeve.
2Pull the terminal while
pushing the locking
lever.
1Hold the sleeve, and
pull out the terminal
slowly.
In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.
<"Terminal with lock mechanism" Detaching points>
Connector
Sleeve
Locking lever
DISASSEMBLY INSTRUCTIONS
SUZ-A09VR.TH SUZ-A12VR.TH
OUTDOOR UNIT
OPERATING PROCEDURE
1. Removing the cabinet.
(1) Remove the screws fixing the top panel. (Photo 1)
(2) Remove the top panel. (Photo 1)
(3) Remove the screw fixing the service panel. (Photo 2)
(4) Pull down the service panel and remove it. (Photo 2)
(5) Remove the screws fixing the cabinet.
(6) Remove the cabinet.
(7) Disconnect the indoor/outdoor connecting wire.
(8) Remove the screws fixing the back panel.
(9) Remove the back panel.
Photo 2
Screw of the
service panel
Photo 1
Screws of
the top panel
Screws of
the cabinet
PHOTOS
Screws of
the top panel
Back
panel
Service
panel
Direction to
remove
Screws of
the cabinet
Hooks
71
Page 72
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
and power P.C. board
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and remove
the back panel. (Refer to 1.)
(3) Disconnect the ground wire, the lead wire to the reactor
and the following connectors;
<Power P.C. board>
CN721 (4-way valve)
CN771 (Fan motor)
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature
thermistor)
CN643 (Ambient temperature thermistor)
CN724 (LEV)
(4) Remove the compressor connector (CN61).
(5) Remove the screws fixing the relay panel. (Photo 3)
(6) Remove the inverter assembly. (Photo 3)
(7) Disconnect all connectors and lead wires on the inverter
P.C. board. (Photo 4)
(8) Remove the inverter P.C. board from the inverter assembly.
(9) Remove the screw fixing the power P.C. board. (Photo 4)
(10)
Disconnect all connectors and lead wires on the power P.C.
board.
(11)
Remove the power P.C. board from the inverter assembly.
Photo 3
Photo 4
Heat sink
Screws of the relay panel
Inverter
P.C. board
Screw of
the ground
wire
Power
P.C. board
3. Removing R.V. coil
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and remove
the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the R.V. coil. (Photo 5)
Screw of the power
P.C. board
72
Page 73
OPERATING PROCEDURE
PHOTOS
4. Removing the defrost thermistor and discharge temperature thermistor
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and 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 6)
(5) Pull out the discharge temperature thermistor from its
holder. (Photo 5)
Photo 5
Photo 6
R.V. coil
Discharge temperature thermistor
73
Defrost
thermistor
Page 74
OPERATING PROCEDURE
PHOTOS
5. Removing outdoor fan motor
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and remove
the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the propeller.
(5) Remove the screws fixing the fan motor. (Photo 7)
(6) Remove the fan motor. (Photo 7)
6. Removing the compressor and 4-way valve
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and remove
the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
(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 pipes connected with 4-way
valve. (Photo 8)
Photo 7
Photo 8
Propeller
Screws of
outdoor
fan motor
NOTE
● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
2
(0MPa).
Welded parts of 4-way valve
74
Page 75
SUZ-A18VR.TH SUZ-A24VR.TH
OUTDOOR UNIT
OPERATING PROCEDUREPHOTOS
1. Removing the cabinet
(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 front panel.
(8) Remove the front panel.
(9) Remove the screws of the back panel.
(10)
Remove the back panel.
Photo 3
Screw of the motor support
Screws
of the
back
panel
Photo 1
Screws
of the
cabinet
Photo 2
Screws
of the
front
panel
Screw of the top panel
Screws of the cabinet
Screw of the service panel
Screws
of the
top
panel
Set screws of the back panel
Screw
of the
valve
cover
75
Page 76
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, electronic control
P.C. board, noise filter P.C. board and power board
(1) Remove the top panel, cabinet and service panel.
(Refer to 1.)
(2) Remove the back panel.
(3) Disconnect the following connectors;
<Electronic control P.C. board>
CN931 and CN932 (Fan motor)
CN975 (LEV)
CN661 (Discharge temperature thermistor, defrost
thermistor and outdoor heat exchanger
temperature thermistor)
<Noise filter P.C. board>
CN912 (4-way valve)
(4) Remove the compressor connector.
(5) Remove the screws fixing the relay panel.
(6) Remove the inverter assembly.
(7) Disconnect all connectors and lead wires on the electronic
control P.C. board.
(8) Remove the electronic control P.C. board from the inverter
assembly.
(9) Remove the screws fixing the power board assembly.
(10)
Disconnect all connectors and lead wires on the power
board.
(11)
Remove the power board from the inverter assembly.
(12)
Disconnect all connectors and lead wires on the noise filter
P.C. board.
(13)
Remove the noise filter P.C. board from the inverter
assembly.
Photo 4
Screws of the power board assembly
Screws of the relay panel
3. Removing R.V. coil
(1) Remove the top panel, cabinet and service panel.
(2) Remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the R.V. coil. (Photo 9)
76
Page 77
OPERATING PROCEDURE
PHOTOS
4. Removing the defrost thermistor, discharge temperature thermistor and outdoor heat exchanger 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 6)
(5) Pull out the discharge temperature thermistor from its
holder. (Photo 5)
(6) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (Photo 6)
Photo 5
Discharge temperature thermistor
Photo 6
Outdoor heat
exchanger
temperature
thermistor
5. Removing outdoor fan motor
(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) Remove the propeller.
(5) Remove the screws fixing the fan motor.
(6) Remove the fan motor.
77
Photo 7
Propeller
Defrost
thermistor
Screws of the outdoor fan motor
Page 78
OPERATING PROCEDURE
PHOTOS
6. Removing the compressor and 4-way valve
(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.
(5) Detach the welded part of the suction and the discharge
pipe connected with compressor. (Photo 9)
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (Photo 8)
NOTE
● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
2
(0MPa).
Photo 8
Welded parts of 4-way valve
Photo 9
R.V. coil
Welded part
of the discharge pipe
7. Removing the reactor
(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.
Welded part
of the suction
pipe
Photo 10
78
Screws of the reactor
Page 79
14
CABINET
GRILLE
PROPELLER
BASE
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
STOP VALVE (GAS)
STOP VALVE (LIQUID)
SERVICE PANEL
BACK PANEL
EXPANSION VALVE
EXPANSION VALVE COIL
4-WAY VALVE
SEPARATOR
MOTOR SUPPORT
CONDENSER NET
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
CAPILLARY TUBE
250V/20A
3P
Including heat sink and RT64
Including heat sink and RT64
Remarks
Part No.
No.
Part Name
L61
21S4
RT61,RT62
RT65
F61
TB
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SUZ-A09VR.TH SUZ-A12VR.TH
SUZ-A09VR.TH
SUZ-A12VR.TH
14-2. OUTDOOR UNIT
ELECTRICAL PARTS
9
8
7
6
2
3
1
4
5
80
Page 81
SUZ-A09VR.TH
Symbol
in Wiring
Diagram
Q'ty/unit
SUZ-A09VR.TH SUZ-A12VR.TH
Remarks
Parts No.Parts Name
E02 838 704
1
DRAIN SOCKET
No.
11
SUZ-A12VR.TH
14-3. DRAIN SOCKET
Outdoor unit {42 drain hole
1
Soft vinyl chloride hose of
25mm inside diameter.
81
Page 82
SUZ-A18VR.TH
SUZ-A24VR.TH
14-4. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL
PARTS
24
262728
1
2
3
4
5
6
7
8
25
23
22
21
20
19
18
16
15
10
13
14
17
12911
82
Page 83
Part numbers that are circled are not shown in the illustration.
No.
Part No.
E02 819 297
1
E02 851 630
2
E02 851 301
3
E02 851 501
4
5
E02 851 290
6
E02 819 232
7
E02 819 009
8
E02 819 521
9
E02 065 506
10
E02 851 900
E02 851 661
11
E02 819 661
12
E02 821 662
13
E02 851 640
14
E02 851 493
15
E02 851 490
16
E02 679 961
17
E02 819 650
18
E02 819 245
E02 851 450
19
E02 852 450
E02 836 374
20
E02 823 375
21
E02 851 337
22
E02 851 444
23
E02 851 308
24
E02 851 440
25
E02 819 233
26
E02 817 009
27
28
E02 851 515
29
E02 127 382
30
E02 737 382
31
E02 735 385
32
E02 851 936
Part Name
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
PROPELLER
BASE
CABINET
HANDLE
FAN GUARD
COMPRESSOR RUBBER SET
COMPRESSOR
STOP VALVE(GAS)
STOP VALVE(GAS)
STOP VALVE(LIQUID)
EXPANSION VALVE
EXPANSION VALVE COIL
R.V. COIL
4-WAY VALVE
VALVE COVER
SERVICE PANEL
OUTDOOR ELECTRONIC CONTROL P.C. BOARD
OUTDOOR ELECTRONIC CONTROL P.C. BOARD
TERMINAL BLOCK
TERMINAL BLOCK
REACTOR
NOISE FILTER P.C. BOARD
THERMISTOR SET
POWER BOARD
BACK PANEL(OUT)
HANDLE
MOTOR SUPPORT
FUSE
FUSE
FUSE & VARISTOR
CAPILLARY TUBE(TAPER PIPE)
Symbol
in Wiring
Diagram
SUZ-A18VR.TH SUZ-A24VR.TH
MF
MC
LEV
21S4
TB2
TB1
L
RT61,RT62,RT68
F801
F911
F912,NR63
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Q'ty/unit
Remarks
1
1
1
PM8H601
1
1
1
1
3
1
3RUBBERS/SET
SNB130FLDH
{12.7
1
1
{15.88
{6.35
1
1
1
1
1
1
1
1
1
2P
3P
1
1
1
1
DISCHARGE, DEFROST
OUTDOOR HEAT EXCHANGER
Including heat sink and RT65
1
1
1
1
1
1
1
250V/3.15A
250V/1A
250V/3.15A
{3.6x{2.4x50
83
Page 84
SUZ-A18VR.TH
E02 817 704
E02 444 705
1
2
DRAIN SOCKET
DRAIN CAP
[33
Symbol
in Wiring
Diagram
Q'ty/unit
Remarks
SUZ-A18VR.TH SUZ-A24VR.TH
1
2
1
2
Part No.
No.
Part Name
SUZ-A24VR.TH
14-5. ACCESSORY
1
2
HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
cCopyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Jun. 2004. No.OC304 REVISED EDITION-A PDF 8
Distributed in Mar. 2004. No.OC304 PDF 8
Made in Japan
New publication, effective Jun. 2004
Specifications subject to change without notice
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