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Service Manual
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Conditions
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Outdoor:DB95°F/WB75°F
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Pipe length:24.6ft
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Capacity ratio (%)
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75
70
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65
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4
FAN AUTO:Press to set fan speed.
5
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6
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8
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9
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10 EXTEND
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9
11
TEMP
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11
12
15
LIGHT:Press it to turn on/off the light.
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15
16
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(COOL),
17
(DRY),
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(AUTO),
(HEAT)(only for heat pump models) will show.
is displayed by pressing the SLEEP button. Press this button
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25
16
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21
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22 SET TIME display:After pressing TIMER button, ON or OFF will blink.This area will
show the set time.
23 TURBO icon:
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24 DIGITAL display:This area will show the set temperature.
25 SENSOR icon:
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button again to clear the display.
26 FAN SPEED display:Press FAN button to select the desired fan speed setting
(AUTO-Low-Med-High).Your selection will be displayed in the LCD windows,
except the AUTO fan speed.
27
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is displayed when pressing the EXTEND button. Press this
button again to clear the display.
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Connect pipes of outdoor unit
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Neaten the pipes
Vacuum pumping and leakage detection
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Start
Is the wiring
terminal between temperature
sensor and the controller loosened or
poor ly contacted?
yes
Insert the temperature
sensor tightly
no
no
Is there short circuit due to tri-pover
of the pa rts?
Malfunction is
eliminated.
yes
Make the parts upright
no
no
Is the temperature
sensor normal according to the
Resistance Table?
Malfunction is
eliminated.
yes
no
Replace it with a
temperature sensor
of the same model
yes
no
Malfunction is
removed.
yes
Replace the controller with
one of the same model
yes
End
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Troubleshooting for
H6 malfunction
Stir the blade
with a tool to see whether
the blade rotates
smoothly
yes
no
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
Is malfunction
eliminated
no
Is the
control terminal of PG motor
connected tightly ?
yes
no
Insert the control
terminal of PG
motor tightly
yes
Is malfunction
eliminated
no
Stir the blade by
hand to see whether
the blade rotate s
smoothly
yes
no
Reinstall the blade and
motor correctly
yes
no
Turn on the
unit again ; measure whether the output
voltage on control terminal for PG motor
is more than 50V within 1 min after the
louvers are opened
yes
Measure the voltage of this foot to neutral
wire on the mainboard
Is malfunction
eliminated
yes
yes
yes
Is the motor
started up
no
no
Replace PG motor
no
Is malfunction
eliminated
yes
Replace the mainboard
with the same model.
End
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6HUYLFH0DQXDO
-XPSHUFDSPDOIXQFWLRQ & Possible causes:
1. There is no jumper cap on the controller;
2. Jumper cap is not inserted properly and tightly;
3. Jumper cap is damaged;
4. Controller is damaged.
chart below:
See the
C5 is displayed
on the unit.
Is there jumper cap on the
controller?
Yes
No
Install a matching
jumper cap.
Is the
malfunction
eliminated?
No
Is the jumper cap inserted
incorrectly or improperly?
No
No
Yes
Re-insert the jumper
cap
Is the
malfunction
eliminated?
Yes
Replace the jumper
cap
Is the
malfunction
eliminated?
Yes
No
The mainboard is
defined abnormal
replace it
End
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6HUYLFH0DQXDO
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Start
Is the supply voltage unstable with big fluctuation?
yes
no
Is the supply voltage too low with overload?
Normal fluctuation is within 10% of the rated voltage on the
nameplate
Malfunction is eliminated.
yes
no
yes
Adjust the supply voltage to maintain it within normal range
Malfunction is eliminated.
yes
no
no
Is the indoor / outdoor heat exchanger too dirty,
or are the air inlet and outlet blocked?
yes
yes
yes
Check the motor and reinstall the motor to have the fan run
normally
Malfunction is eliminated.
yes
no
no
Measure the current of live wire
on the main board with a clamp ampere meter. Is the
current higher than the value of the overcurrent
protection?
Malfunction is eliminated.
no
no
Is the fan motor running abnormally; is the fan speed too
low or does it fail to run?
Clean the indoor and outdoor heat exchangers and remove
the blockage of air inlet and outlet
no
Replace the controller
Malfunction is eliminated.
yes
yes
no
Is there blockage inside the system?
(Filth blockage, ice plug, greasy blockage, the Y-valve hasn’ t
been opened completely)
yes
Flush the heat exchangers with high pressure nitrogen
Malfunction is eliminated.
yes
no
no
Is the compressor running
abnormally? Is there abnormal sound or oil leakage; is
the temperature of the shell too high, etc.?
no
yes
Replace the compressor
Malfunction is eliminated.
yes
no
Replace the control
panel
End
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Test 9
Test 3
Test 4
Test 2
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L
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A
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Test 5
Test 7
Test 8
Test 6
Test 12
Test 10
S
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Test 14
Test 11
Test 13
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0DOIXQFWLRQGLDJQRVLVSURFHVV
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor
Voltage higher than 200V?
Y
Fault with the voltage
testing circuit on
control panel AP1
Replace the control
panel AP1
N
Measure the AC voltage between
terminalL and N on wiring board
XT(power supply)
Voltage within
210VAC~250VAC?
N
Shut down the power
and repair the power
supply to restore the
range
210VAC~250VAC
power on and
restart the unit
If the fault is
eliminated?
Y
Y
or
Shut down the power and wait 20nutes;
mi
use DC voltmeter to measure the voltage
on the two ends of capacitor (test3), until
the voltage is lower than 20V
N
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
reactor Lis normal?
N
Connect the reactor
Laccording to Electrical Wiring Diagram correctly
Re-energize and
turn on the unit
If the fault is
eliminated?
Y
Y
Replace the control
panel AP1
N
End
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Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
Y
Use AC voltmeter
to measure the
voltage between
terminal L and N
on the wiring
board XT)
If the voltage
between terminal L
and N on wiring
board XT is within
210VAC~250VAC?
N
Check the supply
voltage and
restore it to
210VAC~250VAC
Y
Restart the unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
between the two
ends of electrolytic
capacitor on control
panel AP1
Voltage between
the two ends of celectrolytic
capacitor is
higher than
250V
Y
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
dirty? If they are
obstructed by other
objects which affect
the heat exchange
of indoor and
outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
The connection
of capacitor C2
is loose.
Reconnect the
capacitor C2 according
to Electrical Wiring
Diagram. Then,
Restart the
unit.
Y
N
Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage
between the two ends of
capacitor C2, until the
voltage is lower than 20V
Remove the wires
on the two ends of
capacitor C2. Then,
use capacitance
meter to measure
the capacitor C2.
Verify as per the
Parameters Sheet.
If capacitor
C2 is failed?
Replace the capacitor
C2. Then, energize
and start the unit.
Y
Replace the
control panel AP1
N
If there is any
abnormality
described above?
Y
Y
Take corrective actions
according to Technical
Service Manual, and
then energize and start
the unit.
Connect the control panel
AP1 and compressor
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
If the
resistance is
normal?
N
N
If the unit can
work normallv?
If the unit can
work normally?
Y
Y
N
Replace the
control panel AP1
N
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Y
N
Stop the unit and
disconnect the power
supply. Then, check
the connection of
capacitor C2
according to Electrical
Wiring Diagram.
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
If the unit can
work
normally?
N
If the unit can
work
normally?
If the unit can
work normally?
Y
N
Y
Replace the
compressor
COMP
N
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
Resistance higher
than 500MΩ?
Y
Replace the
control panel
AP1
END
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Anti-high temperature,
overload protection
If the outdoor ambient temperature is
higher than 53 ºC?
Y
Normal protection, please use
it after improve the outdoor
ambient temperature
N
After the unit deenergized for 20min
If the radiating of outdoor
and indoor unit is well?
Y
Improve the
radiating
environment of
unit
N
If the indoor and outdoor
fan work well?
N
1. Check if fan terminal
OFAN is connected well
2. Test if resistance value
of any two terminals is less
than 1k with ohmic meter
Y
Replace
control board
AP1
Replace fan
capacitor C1
Replace
outdoor fan
End
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Energize the unit
and start it
If the stop time of compressor
is more than 3min?
If the stop time is not enough and the
high and low pressure of system is not
balance , please start it after 3min
N
Y
If the compressor wire COMP(UVW) is
well connected and connection sequence
is correct
Improve the connection situation
of control board AP1 and
compressor COMP, connect it
with wiring diagram
N
Y
Does the unit start
up normally?
If the refrigerant charging is
too much?
N
Y
Charge the
refrigerant according
to service manual
Does the unit start
up normally?
Y
N
Replace control board AP1
If malfunction is
removed?
N
Replace the
compressor
End
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Synchronism after
energize the unit
and start it
Synchronism
occurred during
operation
If the stop time of
compressor is more than
3min
If the outdoor fan works
normally?
N
N
Check if the fan
terminal OFAN is
connected well
Replace fan
capacitor C1
Y
Y
If the radiating of unit is
well?
If the compressor wire COMP(UVW) is well
connected, the connection sequence
forwards to clockwise direction?
N
Connect
wire well
Y
Replace
control board
AP1
Y
Y
Improve the radiating
of unit (clean heat
exchanger and
increase ventilation)
N
Start to run until the
power resume normal
voltage
Replace
outdoor fan
N
If the input voltage of unit
is normal?
Y
If the refrigerant is too
much?
Remove
malfunction?
N
N
Replace
control board
AP1
Charge the
refrigerant with
service manual
Y
Replace
compressor
Remove
malfunction?
End
N
Y
Replace
compressor
End
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After the unit
de-energized
for 20min
If the overload protector SAT
is well connected?
N
Y
Under ambient temperature, test the
resistance of overload protector with ohmic
Y
N
If the wiring terminal FA of electron
expansion is well connected?
N
Connect wire
well with wiring
diagram
Y
The resistance value of
firs t 4 l e ad fo ot an d th e
fif th lead fo ot is similar,
less than 100
Replace
overload
protector SAT
Replace EKV
coil of electron
expansion valve
Remove
malfunction?
N
Check refrigerant, if there is
leakage, please refer to
specification
Remove
malfunction?
Y
N
Replace
control board
AP1
End
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Start
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connection wire
of reactor (L) of
outdoor unit and
PFC capacity
If there is damaged
short circuit
Y
Replace
connection
wire with circuit
diagram
If the malfunction is
removed?
N
Remove PFC capacity
and test resistance of
two terminals
N
If the resistance
value is 0
Y
Capacity is
short
circuit and
replace it
Re-energize
the unit and
start it
If the malfunction is
removed?
Y
If the malfunction is
removed?
Y
N
Cut the terminal of reactor,
test the resistance
between two terminals of
reactor with ohmic meter
If there is damaged
short circuit
N
Y
Replace the
reactor
Reenergize
the unit and
start it
N
Replace
control board
AP1
N
Y
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If the unit is operation
normal before malfunction
N
Y
Check connection
wire of indoor and
outdoor unit with
circuit diagram
Check builtin wiring of
indoor and
outdoor unit
Y
N
Connection
correct?
N
Malfunction of
circuit is
detected with
control board
AP1 voltage
Y
Check connection
wire of indoor and
outdoor unit with
circuit diagram
If the wiring is
damaged?
N
If the malfunction
is removed?
N
Check communication
circuit of outdoor unit
If the malfunction
is removed?
Problem of
communication
circuit
Y
Replace outdoor
mainboard AP11
If the
malfunction is
removed?
N
Replace indoor
board
N
Y
Y
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Test voltage
value with Test
12 position in
diagram with
voltage meter
Number jumping
N
Y
Test voltage value with
Test 13(18K) 11(24K)
position in diagram with
voltage meter
Y
Number jumping
N
Y
Outdoor unit
malfunction
Test voltage
value with Test
10 position in
diagram with
voltage meter
Number jumping
End
N
Y
Test voltage value
with Test 11(18K)
13(24K) position in
diagram with voltage meter
N
Number jumping
Y
The circuit of
outdoor unit
communication
is normal
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