MAXA BDS28A User manual

TECHNICAL MANUAL 2013
SPLIT MONO DC INVERTER
MODELS
BDS28A
BDS35A
This manual has been created for informative purpose. The company declines every responsibility for the results of projecting or installation based on the explanations and the technical specifications given
in this manual. Is besides forbidden the reproduction under any form of the texts and of the figures contained in this manual.

2
Serie / Series / Serie / Serie
TECHNICAL MANUAL
MONO DC INVERTER
Emissione / Issue
Ausgabe / Emission
04 - 2013
Catalogo / Catalogue / Katalog / Catalogue
MTE01028D2505-00
Sostituise / Supersade
Ersetzt / Remplace
-

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Index
1. SPECIFICATIONS ......................................................................................................................................4
2. CHARACTERISTICS DATA........................................................................................................................6
2.1 Operation characteristic curve ..................................................................................................................6
2.2 Capacity variation ratio according to temperature ....................................................................................6
2.3 Noise criteria curve ...................................................................................................................................6
2.4 Operation data ..........................................................................................................................................6
3. DIMENSIONS ...........................................................................................................................................7
3.1 Indoor units ...............................................................................................................................................7
3.2 Outdoor units ............................................................................................................................................7
4. REFRIGERANT DIAGRAM ......................................................................................................................8
5. ELECTRICAL CIRCUIT DIAGRAM ...........................................................................................................9
5.1 Indoor units ...............................................................................................................................................9
5.2 Outdoor units ............................................................................................................................................9
6. PRINTED CIRCUIT BOARD.....................................................................................................................10
6.1 Indoor units .............................................................................................................................................10
6.2 Outdoor units ..........................................................................................................................................10
7. CONTROL FUNCTIONS .........................................................................................................................11
7.1. Temperature parameters .......................................................................................................................11
7.2. Basic functions.......................................................................................................................................11
8. TROUBLESHOOTING ............................................................................................................................15
8.1 Malfunction diagnosis should be performed as below procedure...........................................................15
8.2 Confirmation ...........................................................................................................................................15
8.3 Flashing LED of Indoor/Outdoor unit and primary judgement ................................................................16
8.4. How to check simply the main parts ......................................................................................................21
Appendix 1: form for indoor/outdoor unit’s ambient sensor numerical value of resistance .........................32
Appendix 2: form for indoor/outdoor unit’s tube temperature sensor numerical value of resistance ..........33
Appendix 3: form for indoor/outdoor unit’s air exhaust temperature sensor numerical value of resistance..34

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1. SPECIFICATIONS
Models of indoor units BDS28A BDS35A
Rated voltage 220-240V ~50Hz
kW 2,5(0,7 ~ 4,4) 3,5(0,7 ~ 4,5)
Total capacity Btu/h 8,53(2,3 ~ 15,00) 11,9(2,3 ~ 15,3)
Power input W 520 900
Rated current A 2,3 4,0
Cooling
S.E.E.R. W/W 7,5-A++ 7-A++
kW 2,7(0,7 ~ 4,8) 3,5(0,7 ~ 5,5)
Total capacity Btu/h 9,3(2,4 ~ 16,3) 12,4(2,4 ~ 18,7)
Power input W 565 895
Rated current A 2,37 7,5
Heating
S.C.O.P. W/W 4,6 – A++ 4,6 – A++
Air flow volume (SH/H/MH/M/ML/L/SL) m³/h 730/670/610/530/460/410/380 770/670/610/530/460/410/380
Dehumidifying volume l/h 0,8 1,4
Fan motor cooling speed (Max - Min) r/min 1300/1050/1000/900/800/700/500 1350/1070/1000/900/800/700/500
Fan motor heating speed (Max - Min) r/min 1300/1150/1080/1030/980/900/850 1350/1150/1080/1030/980/900/850
Output of fan motor W 15 15
Fan motor capacitor μF / /
Fan motor RLA A 0,07 0,07
Fan type - piece Cross flow - 1 Cross flow - 1
Diameter x length mm Φ98 x 662 Φ98 x 662
Evaporator type Aluminium Fin-copper Tube
Pipe diameter mm Φ7 Φ7
Row-fin gap mm 2-1.5 2-1,5
Evaporator
Coil length x height x width (l x H x L) mm 662 x 25,4 x 305 662 x 25,4 x 305
Swing motor model MP24HA/MP24HB/MP24HC MP24HA/MP24HB/MP24HC
Output of swing motor W 2,4 2,4
Fuse A 3,15 3,15
Sound pressure level dBA 36/32/21 36/32/21
Sound power level dBA 46/42/31 46/42/31
Dimension (W/H/D) mm 866 x 292 x 209 866 x 292 x 209
Dimension of package (W/H/D) mm 945 x 377 x 297 945 x 377 x 297
Indoor unit
Net weight/gross weight kg 11/14 11/14
Models of outdoor units BDS28A BDS35A
Compressor manufacturer/trademark SANYO
Compressor model C-6RZ110H1A C-6RZ110H1A
Compressor oil FV50S FVC 68D / RB 68EP
Compressor type ROTARY ROTARY
L.R.A. A 33,00 33,00
Compressor RLA A 4,59 4,59
Compressor power input W 800 800
Overload protector 1NT11L-3979 1NT11L-3979
Throttling method Electronic expansion valve
Starting method 16°C ~ 30°C
Working temperature range (°C) -20°C ~ 48°C
Condensor type Aluminium Fin-copper Tube
Pipe diameter mm Φ7,94 Φ7,94
Rows-fin gap mm 2,5-1,5 2,5-1,5
Condenser
Coil length (l) x height (H) x width (L) mm 763 x 57 x 550 730 x 38.1 x 508
Fan motor speed rpm 850/750/600 850/750/600
Output fan motor W 40 40
Outdoor unit
Fan motor RLA A 0,23 0,23

5
Fan motor capacitor μF / /
Air flow volume of outdoor unit m³/h 2000 2000
Fan type-piece Axial-flow
Fan diameter mm Φ445 Φ445
Defrosting method Automatic Defrosting
Climate type T1 T1
Isolation I I
Moisture protection IP24 IP24
Permissible excessive operating pressure
for the dischar
g
e side Mpa 3,8 3,8
Permissible excessive operating pressure
for the suction side Mpa 1,2 1,5
Sound pressure level dB(A) 49/-/- 50/-/-
Sound power level dB(A) 59/-/- 60/-/-
Dimensions (WXHXD) mm 906 x 596 x 378 906 x 596 x 378
Dimension of package (L/W/H) mm 948 x 420 x 645 348 x 420 x 645
Net weight/gross weight kg 43/47 43/47
Refrigerant charge (R410A) kg 1,3 1,3
Length m 5 5
Gas additional charge g/m 20 20
Liquid pipe mm Φ6 Φ6
Outer diameter Gas pipe mm Φ9,52 Φ9,52
Height m 10 10
Connecting pipe
Max distance Length m 15 20
The above data of specifications are subject to change without prior notice. Please refer to the actual data specified on the nameplate of
the unit.
Note: Test conditions:
Indoor side state Outdoor side state
Standard condition Dry bulb temp. °C Wet bulb temp. °C Dry bulb temp. °C Wet bulb temp. °C
Rated cooling 27 19 35 24
Rated heating 20 15 7 6
3) Microphone at a distance of 1m from the unit.
Approximate calculation from Sound Pressure Level to Sound Power Level:
- Average Sound Pressure Level p
L=10*lg
[
]
21 *1.0*1.0 1010(*2/1 PP LL +.
1P
L: Sound pressure level of front test point.
2P
L: Sound pressure level of side test point for indoor unit 1P
L,2P
L.
- Approximate Sound Power Lever W
L=p
L+10.

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2. CHARACTERISTICS DATA
2.1 Operation characteristic curve
Cooling
0
2
4
6
8
10
505151 0 20 30 40 60 70 80 90020304060708090
Compressor speed (rps)
Current (A)
BDS35A
BDS35A
BDS28A
BDS28A
Heating
0
2
4
6
8
10
Compressor speed (rps)
Current (A)
Condition
Indoor:DB27 WB19
Outdoor:DB35 WB24
Indoor air flow: Super High
Pipe length: 5m
Condition
Indoor:DB20
Outdoor:DB7
Indoor air flow:Super High
Pipe length: 5m
2.2 Capacity variation ratio according to temperature
BDS35A BDS35A
BDS28A
BDS28A
0
20
33 35 37 39 41 43 45 -18 -14 -10 -6 -2 2 6 1
0
40
60
80
100
120
140
160
180
200
Outdoor temp.( )
Capacity ratio(%)
Condition
Indoor:DB27 WB19
Indoor air flow: Super High
Pipe length: 5m
0
20
40
60
80
100
120
140
160
180
200
Outdoor temp.( )
Capacity ratio(%)
gnitaeHgnilooC
Condition
Indoor:DB20
Indoor air flow:Super High
Pipe length: 5m
2.3 Noise criteria curve
BDS35A
BDS35A
BDS28A
BDS28A
10
15
20
25
30
35
40
45
50
Super High
Indoor fan motor rotating speed (rps)
tinUroodtuOtinUroodnI
Noise/dB(A)
30
35
40
45
50
55
Compressor speed (rps)
Noise/dB(A)
High Middle Low Quiet
0 8 20 30 40 50 60 70 80 90
2.4 Operation data
Cooling:
Temperature
conditions (°C)
Standard
pressure
Heat exchanger pipe
temp.
Indoor Outdoor
Model
name P(MPa) T1 (°C) T2 (°C)
Indoor fan speed Outdoor fan
speed
Compressor
revolution (rps)
BDS28A 34
27/19 35/24
BDS35A
0,9~1,2 In: 12~14
Out: 10~12
In: 41~43
Out: 43~45 Super high Super High
55

7
Heating:
Temperature
conditions (°C)
Standard
pressure
Heat exchanger pipe
temp.
Indoor Outdoor
Model
name P(MPa) T1 (°C) T2 (°C)
Indoor fan speed Outdoor fan
speed
Compressor
revolution (rps)
BDS28A 41
20/15 7/6
BDS35A
2,0~2,6 In: 33~35
Out: 42~44
In: 3~5
Out: 3~5 Super high Super high
55
Notes:
(1) Connecting piping condition: 5m.
(2) T1: Outlet and inlet pipe temperature of evaporator.
T2: Outlet and inlet pipe temperature of condenser.
P: Pressure of air pipe used for connecting outdoor and indoor units.
Notes:
(1) Measure surface temperature of heat exchanger pipe around center of heat exchanger path U bent.
(Thermistor thermometer)
(2) Connecting piping condition: 5m.
3. DIMENSIONS
3.1 Indoor units
866
541162 163
209
3.2 Outdoor units

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4. REFRIGERANT DIAGRAM
TINUROODTUOTINUROODNI
HEAT
EXCHANGE
(EVAPORATOR)
HE AT
EXCHANGE
(CONDENSER)
COMPRESSOR
GAS SIDE
3-WAY VALVE
LIQUID SIDE
2-WAY VALVE
COOLING
HEATING
Accumlator
Discharge
Suction
4-Way valve
Electron expansion valve reniartSreniartS

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5. ELECTRICAL CIRCUIT DIAGRAM
5.1 Indoor units: BDS28A, BDS35A
RT2RT1
0
L-OUT
AC-L YEGN
BN
BK
BU
GENERATOR
COOLPLASMA
CONN WIRE
YEGN
0
PE
M2 M4
M3
RECEIVERAND
EVAPORATOR
FAN
BOARD
TERMINAL
RD BU
HEALTH-L HEALTH-N
RING
MAGNETIC
MOTOR(U.D2)
MOTOR(U.D1)MOTOR(L.R)
PRINTED CIRCUITBOARD
SWING
SWING-LR
SWING
SWING-UD2
DISPLAYBOARD
AP1
DISP2DISP1
POWER
N
L
BN(BK)
YEGN(GN)
BU(WH)
BK
N
YEGN
COM-OUT 3
2
OUTDOOR UNIT
N(1)
BN
BU
XT1
PE
L
L
DC-MOTOR
M1
ROOM TUBE
K7
SWING-UD1
AP2
SWING
MOTOR TEMP.SENSOR
TUBE
ROOM
TEMP.SENSOR
CAP
JUMP
5.2 Outdoor units: BDS28A, BDS35A
4YV
COMP
M
XT2
RT3
0
0
RT2
0
RT1
2
3
N(1)
OFAN1
E
RE
C
SPE
COMP-U
AP1
W1BN
W4BK
W2BU
W3YEGNW10RD
W8YEGN
BN
BK
BU
YEGN
W5BU W6YE W7RD
N1
AC-L1
4V AC-L2
N2 N3
COMU
W9BU
EKV
CN1
PE
PE
PE
EH1
RD RD
HEATER
(COMP)
HEAT-N1
(CHASSIS)
HEATER
EH2
HEAT-N2 HEAT-L
TEM.SENSOR
OUTROOM EXHAUST
TEM.SENSOR
TEM.SENSOR
TUBE
COMP
FAN
L1
L1
L2 L2 L2
OVC-COMP CN2
W13WH
HPP
HP
P
COMP-V COMP-W
LX-2
WHOG
W12
W11
L3
LX-1
L
L3
SAT
INDOOR UNIT

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6. PRINTED CIRCUIT BOARD
6.1 Indoor unit: BDS28A, BDS35A
No Part name
1 DC fan
2 Microswitch
3 Electrostatic precipitation
4 Small up & down swing interface
5 Left and right
6 Big up & down swing interface
7 Display interface
8 Ambient temperature sensor
9 Tube temperature sensor
10 Outdoor unit live wire
11 Input interface of live wire for
indoor unit
12 Health
13 Fuse
14 Interface of neutral wire for
indoor and outdoor units
12345
6
7
8911 1012
13
14
15
15 Communication interface of
indoor and outdoor units
6.2 Outdoor units: BDS28A, BDS35A
No Part name
1 Input of neutral wire of power
2 Input of live wire of power
3 Communication interface
4 Interface 1 of electric reactor
5 Interface 2 of electric reactor
6 Interface of fan
7 Neutral wire of electric heater of
chassis
8 Neutral electric wire of
compressor
9 Neutral wire of 4-way valve
10 Live wire of 4-way valve
11 Live wire of electric heater
12 Input of overload
13 Temperature sensor
14 U, V, W three phases of
compressor
15 Input of ground wire of power

11
7. Control functions
7.1. Temperature Parameters
•Indoor preset temperature (Tpreset)
•Indoor ambient temperature (Tamb)
7.2. Basic functions
Once energized, the compressor should in no way be restarted unless after at least 3-minute time interval. In case of having
memory function, for the first energization, the compressor will be started without 3-minute lag, if being under the condition
of power-off, and the compressor will have 3-minutes delay to be started under the condition of power-on. Once started, the
compressor will not be stopped within 6 minutes with the changes of room temperature.
7.2.1 Cooling Mode
Cooling Condition and Process
When Tamb. ≥Tpreset , the unit will run under cooling mode, in which case the compressor and outdoor fan will be started,
and the indoor fan will run at preset speed.
When Tamb. ≤Tpreset -3°C, the compressor will stop, the outdoor fan will stop with time lag of 30s, and the indoor fan will run
at preset speed.
When Tpreset -3°C <Tamb. < Tpreset , the unit will maintain its original operating status.
■Under this mode, the switchover (reversal) valve will be de-energized and the temperature can be set from 16°C to 30°C.
If the compressor is shut down for some reason, the indoor fan and the swing device will operate at the original state.
Tpreset
Tpreset –2 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original operating status
≥6 min. ≥3 min. ≥6 min.
Setting fan speed
Protection function
♦ Overcurrent protection
If total current is high, the compressor will run in limited frequency. If total current is too high, the compressor will stop, the
outdoor fan will delay 30 seconds to stop, indoor unit will display E5 and outdoor yellow light will blink 5 times.
♦ Antifreeze protection
When the antifreeze protection is detected, the compressor will stop, the outdoor fan will stop after 30 seconds, and the
indoor fan and swing motor will keep running in the original mode. When antifreeze protection is eliminated and the
compressor has stopped for 3 minutes, the compressor will resume running in the original mode.
The period o
f
antifreezing protection
Compressor
Outdoor fan
Indoor fan
3 min
Low fan speed
Run Stop

12
7.2.2 Dehumidifying mode
7.2.2.1 The condition and process of dehumidifying
If Tamb. > Tpreset, DRY mode will act, the indoor fan, outdoor fan and compressor will run, and indoor fan will run at low
speed.
If Tset - 2°C ≤Tambient ≤Tpreset, the unit will keep running in the original mode.
If Tam. ≤Tset - 2°C, the compressor will stop running, the outdoor fan will delay 30 seconds to stop and the indoor fan will
run at low speed.
7.2.2.2 Protection function
Protection is the same as that under COOL mode.
7.2.3 HEAT mode
7.2.3.1 The condition and process of heating
If Tamb ≤Tprset + 2°C, HEAT mode will act, the compressor, outdoor fan and reversal valve will run, the indoor fan will delay
3min to stop at the latest.
If Tprset +2°C < Tamb < Tprset + 5°C, the unit will keep running in the original mode.
If Tamb > Tprset + 5°C, the compressor will stop, the outdoor fan will delay 30 sec to stop and Indoor unit fan blow with low
speed for 60s,during this period, fan speed is not changeable.
●In this mode, the temperature setting range is 16°C ~ 30°C.
The air conditioner will adjust the running frequency of the compressor automatically according to the change of ambient
temperature.
●When the unit is turned off in HEAT mode, or switched to other mode from HEAT mode, the four –way valve will be
powered off after the compressor stops.
Stop heating
Original running state
Start heating
Compressor
Outdoor Unit
Indoor Unit
Reversal valve
6min 3min 6min
3minSet fan speed 3min
Run
Tamb
60s
30s 30s
60s
Stop
7.2.3.2 The condition and process of defrosting
When frost is detected in the condenser, the system will enter into defrosting state. When defrosting starts, the compressor
and indoor fan will stop, and the outdoor fan and four-way valve will delay 30 seconds to stop. The compressor will start
after 15 seconds and then defrosting will be started. When the compressor has run for 7 minutes or defrosting is finished,
the compressor will stop. After 30 seconds the four – way valve opens and after an other 60 seconds, the compressor and
outdoor fan resume running. The indoor fan will delay 3 minutes to run at the la test and temperature on the display panel
shows H1.
Four-way valve
Compressor
Outdoor Unit
Indoor Unit
Run Stop
7min
The period of defrosting
3min Set fan speed

13
7.2.3.3 Protection function
♦ Anti-cold – wind protection
In HEAT mode, in order to prevent the indoor unit from blowing out cold wind, each time the compressor starts, the indoor
fan will delay 3 minutes after the compressor to run at the latest and it can adjust fan speed automatically when
temperature is low.
♦ Overcurrent protection
Overcurrent protection is the same with that in COOL mode.
Protection
♦Cold air prevention
The unit is started under heating mode (the compressor is ON):
① In the case of Tindoor amb. < 24°C: if Ttube ≤40°C and the indoor fan is at stop state, the indoor fan will begin to run at low
speed with a time lag of 2 minutes. Within 2 minutes, if Ttube > 40°C, the indoor fan also will run at low speed; and after
1-minute operation at low speed, the indoor fan will be converted to operation at preset speed. Within 1-minute low speed
operation or 2-minute non-operation, if Ttube > 42°C, the fan will run at present speed.
②In the case of Tindoor amb. ≥24°C: if Ttube > 42°C, the indoor fan will run at low speed, and after one minute, the indoor fan
will be converted to preset speed. Within one-minute low speed operation, if Ttube > 42°C, the indoor fan will be converted to
preset speed.
Note: Tindoor amb. indicated in ①and ②refers to, under initially heating mode, the indoor ambient temperature before the
command to start the compressor is performed according to the program, or after the unit is withdrawn from defrost, the
indoor ambient temperature before the defrost symbol is cleared.
♦Total current up and frequency down protection
If the total current Itotal ≤W, frequency rise will be allowed; if Itotal ≥X, frequency rise will not be allowed; if Itotal ≥Y, the
compressor will run at reduced frequency; and if Itotal ≥Z, the compressor will stop and the outdoor fan will stop with a time
lag of 30s.
7.2.4 Fan Mode
Under the mode, the indoor fan will run at preset speed and the compressor, the outdoor fan, the four-way valve and the
electric heater will stop.
7.2.5 AUTO Mode
① Working conditions and process of AUTO mode
Under AUTO mode, standard cooling temperature Tset is 25°C and standard heating temperature Tset is 20°C.
a) Once energized, if Tamb. ≤22°C, the unit will be started under heating mode; if 23°C< Tamb.< 25°C, the unit will run under
fan mode and the run indicator will be bright; and if Tamb. ≥25°C, the unit will be started under cooling mode.
b) Under AUTO mode, if Tamb. ≥Tset is detected, the unit will select to run under cooling mode, in which case implicit set
temperature is 25°C; if Tamb. ≤Tpreset - 2°C, the compressor will stop, the outdoor fan will stop with a time lag of 1 minute, and
the indoor fan will run at set speed; and if Tset - 2°C< Tamb.< Tset, the unit will remain at its original state.
c) Under AUTO mode, if Tamb. ≤Tset+2°C is detected, the unit will select to run under heating mode, in which case implicit
preset temperature is 20°C; if Tamb. ≥Tset + 5°C, the compressor will stop, the outdoor fan will stop with a time lag of 1
minute, and the indoor fan will run under the mode of residue heat blowing; and if Tset +2°C< Tamb.< Tset + 5°C, the unit will
remain at its original state.
d) Under AUTO mode, if 23°C < Tamb.< 25°C, the unit will remain at its original state.

14
②Protection
a) In cooling operation, protection is the same as that under the cooling mode;
b) In heating operation, protection is the same as that under the heating mode;
c) When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor will
remain unchanged for at least 6 minutes.
7.2.6 Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
①Overload protection
Ttube: measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor heat
exchanger under heating mode.
1) Cooling overload
a) If Ttube ≤52°C, the unit will return to its original operation state.
b) If Ttube ≥55°C, frequency rise is not allowed.
c) If Ttube ≥58°C, the compressor will run at reduced frequency.
d) If Ttube ≥62 °C, the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a) If Ttube ≤50°C, the unit will return to its original operation state.
b) If Ttube ≥53°C, frequency rise is not allowed.
c) If Ttube ≥56°C, the compressor will run at reduced frequency.
d) If Ttube ≥60°C, the compressor will stop and the indoor fan will blow residue heat and then stop.
②Exhaust temperature protection of compressor
If exhaust temperature ≥98°C, frequency is not allowed to rise.
If exhaust temperature ≥103°C, the compressor will run at reduced frequency.
If exhaust temperature ≥110°C, the compressor will stop.
If exhaust temperature ≤90°C and the compressor has stayed at stop for at least 3 minutes, the compressor will resume its
operation.
③Communication fault
If the unit fails to receive correct signals for durative 3 minutes, communication fault can be justified and the whole system
will stop and the display will show the error code E6.
④Module protection
Under module protection mode, the compressor will stop. When the compressor remains at stop for at least 3 minutes, the
compressor will resume its operation. If module protection occurs six times in succession, the compressor will not be started
again.
⑤Overload protection
If temperature sensed by the overload sensor is over 115°C, the compressor will stop and the outdoor fan will stop with a
time lag of 30 seconds. If temperature is below 95°C, the overload protection will be relieved.
⑥If voltage on the DC bus is below 150V or over 420V
If voltage on the DC bus is below 150V or over 420V, the compressor will stop and the outdoor fan will stop with a time lag of
30 seconds. When voltage on the DC bus returns to its normal value and the compressor has stayed at stop for at least 3
minutes, the compressor will resume its operation.

15
⑦Faults of temperature sensors
Designation of sensors Faults
Indoor ambient temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds.
Indoor tube temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds.
Outdoor ambient temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds.
Outdoor tube temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds, and no
detection is performed within 10 minutes after defrost begins.
Exhaust After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or
short-circuited for successive 30 seconds.
Overload After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or
short-circuited for successive 30 seconds.
8Power-failure memory protection
Memory content: mode, up-down purging, lighting, set temperature, and set fan speed. After having power failure, it can
automatically start operating according to the memory content after being powered on again. If no timing function is set in the
final remote control order, the system will memorize the latest remote control order and then operate based on the manner
set during the latest time. There is common timing function included in the latest remote control order. If the system has
power failure when the timed time is still not reached, the system will memorize the timing function in the latest remote
control order after being powered on again, and the timing time will be calculated from the power-on time again. If there is
timing function in the latest remote control order, when the timed time is reached and there is power-failure after the system
conduct the action of the set timed start or timed stop, then after powered on again, the system will memorize the operating
condition before power failure and will not implement the timing action, and also the moment timing will not be memorized.
8. TROUBLESHOOTING
8.1 Malfunction diagnosis should be performed as below procedure
Step Malfunction diagnosis procedure
1 Conform malfunction
2 Read out the error code for indoor/outdoor unit and then find out the corresponding malfunction name
3 Troubleshooting and maintenance (refer to the content as below for details)
Note: There’s high capacity electrolytic capacitor on outdoor unit’s main board. Therefore, there’s still high voltage (DC
280V-380V, which is depending on the input voltage) in the capacitor even if the power is disconnected.
That voltage can only be decreased to the safety valve after more than 20mins. There will be electric shock if you touch the
electrolytic capacitor within 20mins. Therefore, if it needs to maintain it after disconnecting the power, you must discharge
the electrolytic capacitor according to below method.
8.2 Confirmation
(1) Confirmation of Power Supply
Confirm that the power breaker operates (ON) normally;
(2) Confirmation of Power Voltage
Confirm that power voltage is AC 220–230–240 ±10%. If power voltage is not in this range, the unit may not operate
normally.

16
8.3 Flashing LED of Indoor/Outdoor unit and primary judgement
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF
0.5s)
Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and they will be displayed
circularly every 5s.
No Malfunction LED 88 Operation
Indicator
COOL
Indicator
Heating
Indicator
Yellow
Indicator
Red
Indicator
Green
Indicator
A/C status Possible causes
1
High pressure
protection of
system
E1 Blinks
once
- During cooling and
drying operation,
except indoor fan
operates, all loads stop
operation.
- During heating
operation, the
complete unit stops.
1. Refrigerant was
superabundant.
2. Poor heat exchange
(including filth blockage
of heat exchanger and
bad radiating
environment);
3. Ambient temperature
is too high.
2 Antifreezing
protection E2 Blinks
twice Blinks 3
times
During cooling and
drying operation,
compressor and
outdoor fan stop
while indoor fan
operates.
1. Poor air-return in
indoor unit.
2. Fan speed is
abnormal.
3. Evaporator is dirty.
3
Refrigerant
leakage
protection
F0 Blinks 9
times
The Dual-8 Code
Display will show F0
and the complete unit
stops.
1. Refrigerant
leakage;
2. Indoor evaporator
temperature sensor
works abnormally;
3. The unit has been
plugged up somewhere
.
4
High
discharge
Temperature
protection of
compressor
E4 Blinks 4
times Blinks 7
times
- During cooling and
drying operation,
compressor and
outdoor fan stop while
indoor fan operates.
- During heating
operation, all loads
stop.
Please refer to the
malfunction analysis
(discharge protection,
overload).
5 Overcurrent
protection E5 Blinks 5 times Blinks 5 times
- During cooling and
drying operation,
compressor and
outdoor fan stop while
indoor fan operates.
- During heating
operation, all loads
stop.
1. Supply voltage is
unstable.
2. Supply voltage is
too low and load is too
high.
3. Current is too high.
6 Communication
Malfunction E6 Blinks 6
times Always
ON
- During cooling
operation,
compressor stops
while indoor fan
motor operates.
- During heating
operation, the
complete unit stops.
Refer to the
corresponding
malfunction analysis.
7
High temp.
resistant
protection
E8 Blinks 8
times Blinks 6 times
- During cooling
operation:
compressor will stop
while indoor fan will
operate.
- During heating
operation, the
complete unit stops.
Refer to the
malfunction analysis
(overload, high
temperature
resistant).
8 EEPROM
malfunction EE
Blinks 15
times
Blinks 11
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate.
- During heating
operation, the
complete unit will
stop
Replace outdoor
control panel AP1.
9
Limit/decrease
frequency due
to high temp of
module
EU Blinks 6
times
Blinks 6
times
All loads operate
normally, while
operation frequency fo
r
compressor is
decreased
Discharging after the
complete unit is
de-energized for 20min,
check whether the
thermal grease on IPM
Module of outdoor
control panel AP1 is
sufficient and whether
the radiator is inserted
tightly. If it’s no use,
please replace control
panel AP1.

17
10
Malfunction
protection of
jumper cap
C5 Blinks 15
times
Wireless remote
receiver and button
are effective, but can
not dispose the
related command
1. No jumper cap
insert on mainboard.
2. Incorrect insert of
jumper cap.
3. Jumper cap
damaged.
4. Abnormal detecting
circuit of mainboard.
11 Gathering
refrigerant F0 Blinks 1
time
Blinks
1 time Blinks 17
time
When the outdoor unit
receive signal of
Gathering refrigerant,
the system will be
forced to run under
cooling mode for
gathering refrigerant
Nominal cooling mode
12
Indoor
ambient
temperature
sensor is
open/short
circuited
F1 Blinks
once
- During cooling and
drying operation,
indoor unit operates
while other loads will
stop.
- During heating
operation, the
complete unit will
stop operation.
1. Indoor ambient
temperature sensor
hasn’t been
connected well with
indoor unit’s control
panel AP1 (refer to
the wiring diagram for
indoor unit).
2. Room temperature
sensor is damaged
(refer to the
resistance table of
temp. sensor
appendix 1)
3 Mainboard
damaged
13
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2 Blinks
twice
- During cooling and
drying operation,
indoor unit will
operate while other
loads will stop;
- During heating
operation, the
complete unit will stop
operation.
1. Evaporator temp.
sensor hasn’t been
connected well with
indoor unit’s control
panel AP1 (refer to
the wiring diagram for
indoor unit).
2. Evaporator temp.
sensor is damaged
(please refer to the
resistance table of
temp. sensor).
14
Outdoor
ambient
temperature
sensor is
open/short
circuited
F3 Blinks 3
times Blinks 6
times
- During cooling and
drying operating,
compressor stops
while indoor fan
operates;
- During heating
operation, the
complete unit will
stop operation
1. Outdoor ambient
temp. sensor hasn’t
been connected well
or is damaged.
2. Please check it by
referring to the
resistance table for
temperature sensor
appendix 1).
15
Outdoor
condenser
temperature
sensor is
open/short
circuited
F4 Blinks 4
times Blinks 5
times
- During cooling and
drying operation,
compressor stops
while indoor fan will
operate;
- During heating
operation, the
complete unit will
stop operation.
1. Condenser temp.
sensor hasn’t been
connected well or is
damaged.
2. Please check it by
referring to the
resistance table for
temperature sensor
appendix 2)
16
Outdoor
discharge
temperature
sensor is
open/short
circuited
F5 Blinks 5
times Blinks 7
times
- During cooling and
drying operation,
compressor will sop
after operating for
about 3 minutes,
while indoor fan will
operate;
- During heating
operation, the
complete unit will
stop after operating
for about 3 minutes.
1. Outdoor discharge
temp. sensor hasn’t
been connected well
or is damaged. Please
check it by referring to
the resistance table
for temp. sensor
appendix 3).
2. The head of temp.
sensor hasn’t been
inserted into the
copper tube.
17
Limit/decrease
frequency due
to overload
F6 Blinks
6 times Blinks 3
times
All loads operate
normally, while
operation frequency
for compressor is
decreased
Refer to the
malfunction analysis
(overload, high
temperature
resistant).
18
Decrease
frequency due
to overcurrent
F8 Blinks
8 times Blinks
once
All loads operate
normally, while
operation frequency
for compressor is
decreased
The input supply
voltage is too low;
System pressure is
too high and overload.

18
19
Decrease
frequency due
to high air
discharge
F9 Blinks
9 times Blinks
twice
All loads operate
normally, while
operation frequency for
compressor is
decreased
1. Overload or
temperature is too
high.
2. Refrigerant is
insufficient;
3. Malfunction of
electric expansion
valve (EXV.
20
Limit/decrease
frequency due
to antifreezing FH Blinks
2 times
Blinks 2
times Blinks 4
times
All loads operate
normally, while
operation frequency
for compressor is
decreased
Poor air-return in
indoor unit or fan
speed is too low
21
DC generatrix
voltage is too
high
PH Blinks 11
times Blinks 13
times
During cooling,
dehumidifying,
compressor stop
running fan motor
works.
During heating: all
will stop
1. Testing the voltage
of position L and N on
terminal XT, if higher
than 265VAC, please
cut off the power
supply and restart
until back to normal.
2. If input voltage is
normal, testing the
voltage of electrolytic
capacitor C on AP1
after turn on the unit.
There may be some
problem and replace
the AP1 if the
electrolytic capacitor
voltage range at
200-280V.
22
Voltage of DC
bus-bar is too
low
PL
Blinks 21
times
Blinks 12
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate.
- During heating
operation, the
complete unit will
stop.
1. Measure the
voltage of position L
and N on wiring board
(XT), if the voltage is
higher than 150VAC,
turn on the unit after
the supply voltage is
increased to the
normal range.
2. If the AC input is
normal, measure the
voltage of electrolytic
capacitor C on control
panel (AP1), if it’s
normal, there’s
malfunction for the
circuit, please replace
the control panel (AP1)
23
Compressor
Min frequence
in test state P0 Blinks
0.25Hz
Blinks
0.25Hz
Showing during min.
cooling or min. heating
test
24
Compressor
rated frequence
in test state P1 Blinks
0.25Hz
Blinks
0.25Hz
Showing during nominal
cooling or nominal
heating test
25
Compressor
Max frequence
in test state P2 Blinks
0.25Hz
Blinks
0.25Hz
Showing during max.
cooling or max. heating
test
26
Compressor
intermediate
frequence in
test state
P3 Blinks
0.25Hz
Blinks
0.25Hz
Showing during
middle cooling or
middle heating test
27
Overcurrent
protection of
phase current
for compressor
P5 Blinks
0.25Hz
Blinks
0.25Hz
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
During heating
operation, the complet
e
unit will stop operation.
Refer to the
malfunction analysis
(IPM protection, loss
of synchronism
protection and
overcurrent protection
of phase current for
compressor.
28
Charging
malfunction of
capacitor
PU
Blinks 17
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate.
- During heating
operation, the complet
e
unit will stop.
Refer to the part
three—charging
malfunction analysis
of capacitor.
29
Malfunction of
module temp.
sensor circuit P7
Blinks 18
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the complet
e
unit will stop
Replace outdoor
control panel AP1

19
30
Module high
temperature
protection P8
Blinks 19
times
During cooling
operation,
compressor will stop
while indoor fan will
operate;
During heating
operation, the
complete unit will
stop
After the complete
unit is deenergized for
20mins, check
whether the thermal
grease on IPM
Module of outdoor
control panel AP1 is
sufficient and whether
the radiator is inserted
tightly. If it’s no use,
please replace control
panel AP1.
31
Decrease
frequency due
to high temp.
resistant during
heating
operation
H0
Blinks 10
times
All loads operate
normally, while
operation frequency
for compressor is
decreased
Refer to the
malfunction analysis
(overload, high
temperature resistant)
32 Static dedusting
protection H2
Blinks
twice
33
Overload
protection for
compressor
H3
Blinks 3
times
Blinks 8
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the
complete unit will
stop operation.
1. Wiring terminal
OVC-COMP is
loosened. In normal
state, the resistance
for this terminal should
be less than 1ohm.
2. Refer to the
malfunction analysis
(discharge protection,
overload)
34 System is
abnormal H4
Blinks 4
times
Blinks 6
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the
complete unit will
stop operation.
Refer to the
malfunction analysis
(overload, high
temperature resistant)
35 IPM protection H5
Blinks 5
times
Blinks 4
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the
complete unit will
stop operation
Refer to the
malfunction analysis
(IPM protection, loss
of synchronism
protection and
overcurrent protection
of phase current for
compressor.
36 Module temp.
is too high H5
Blinks 5
times
Blinks 10
times
37
Internal motor
(fan motor) do
not operate
H6 Blinks 11
times
Internal fan motor,
external fan motor,
compressor and
electric heater stop
operation, guide
louver stops at
present location.
1. Bad contact of DC
motor feedback
terminal.
2. Bad contact of DC
motor control end.
3. Fan motor is
stalling.
4. Motor malfunction.
5. Malfunction of
mainboard rev
detecting circuit.
38 Desynchronizing
of compressor H7
Blinks 7
times
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
During heating
operation, the complet
e
unit will stop operation.
Refer to the
malfunction analysis
(IPM protection, loss
of synchronism
protection and
overcurrent protection
of phase current for
compressor.
39 PFC protection HC
Blinks 6
times
Blinks 14
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the unit
will stop operation
Refer to the
malfunction analysis.
40
Outdoor DC
fan motor
malfunction L3 Blinks 23
times Blinks
14 times
Outdoor DC fan
motor malfunction
lead to compressor
stop operation,
DC fan motor
malfunction or system
blocked or the
connector loosed
41 Power
protection L9 Blinks 20
times Blinks 9
times
compressor stop
operation and outdoor
fan motor will stop 30s
latter, 3 minutes latter
fan motor and
compressor will restart
To protect the
electronical
components when
detect high power

20
42
Indoor unit and
outdoor unit
does not match LP Blinks 19
times Blinks 16
times
compressor and
outdoor fan motor
can’t work
Indoor unit and
outdoor unit doesn't
match
43 Failure
start-up LC
Blinks 11
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate.
- During heating
operation, the
complete unit will
stop operation.
Refer to the
malfunction analysis.
44
Malfunction of
phase current
detection
circuit for
compressor
U1
Blinks 13
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the complet
e
unit will stop
Replace outdoor
control panel.
45
Malfunction of
voltage
dropping for
DC bus-bar
U3
Blinks 20
times
- During cooling and
drying operation,
compressor will stop
while indoor fan will
operate;
- During heating
operation, the complet
e
unit will stop.
Supply voltage is
unstable.
46
Malfunction of
complete unit’s
current detection
U5 Blinks 13
times
- During cooling and
drying operation, the
compressor will stop
while indoor fan will
operate;
- During heating
operating, the
complete unit will
stop operation.
There’s circuit
malfunction on
outdoor unit’s control
panel AP1, please
replace the outdoor
unit’s control panel
AP1.
47
The four-way
valve is
abnormal U7 Blinks 20
times
If this malfunction
occurs during heating
operation, the complet
e
unit will stop operation.
1. Supply voltage is
lower than AC175V;
2. Wiring terminal 4V
is loosened or broken;
3.4V is damaged,
please replace 4V.
48
Zerocrossing
malfunction of
outdoor unit U9 Blinks 18
times
During cooling
operation, compressor
will stop while indoor
fan will operate; during
heating, the complete
unit will stop operation.
Replace outdoor
control panel AP1
49 Frequency
limiting(power) Blinks
13 times
50 Compressor
running Blinks
once
51
The temp. for
turning on the
unit is reached
Blinks 8
times
52
Frequency
limiting(module
temperature)
Blinks 11
times
53 Normal
comunication Blinks
once
54 Defrosting
Blinks
once
(during
blinking,
ON 10s
and OFF
0.5s)
Blinks
twice
- Defrosting will occur
in heating mode.
Compressor will
operate while indoor
fan will stop operation.
It’s the normal state.