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XSFI-1104-A
SERVICE MANUAL
MIDEA AIRCONDITIONER
EUROPE MARKET
SPLIT WALL-MOUNTED TYPE
X SERIES
The designs, and information in this book are subject to change without notice for product improvement.
CONTENTS
1. Precaution .................................................................................................................................................... 1 1.1 Safety Precaution ........................................................................................................................1 1.2 Warning .......................................................................................................................................1 2. Function ........................................................................................................................................................ 6 3. Dimension .................................................................................................................................................... 9 3.1 Indoor Unit ...................................................................................................................................9 3.2 Outdoor Unit ..............................................................................................................................10 4. Refrigerant Cycle Diagram ........................................................................................................................ 11 5. Wiring Diagram .......................................................................................................................................... 12 5.1 Indoor Unit .................................................................................................................................12 5.2 Outdoor Unit ..............................................................................................................................14 6. Installation details ..................................................................................................................................... 16 6.1 Wrench torque sheet for installation ..........................................................................................16 6.2 Connecting the cables ...............................................................................................................16 6.3 Pipe length and the elevation ....................................................................................................17 6.4 Air purging with vacuum pump ..................................................................................................17 6.5 Pumping down (Re-installation) ................................................................................................19 6.6 Re-air purging (Re-installation) .................................................................................................20 6.7 Balance refrigerant of the 2-way, 3-way valves .........................................................................21 6.8 Evacuation ................................................................................................................................22 6.9 Gas charging .............................................................................................................................23 7. Operation characteristics ......................................................................................................................... 24 8. Electronic function .................................................................................................................................... 25 8.1 Abbreviation ..............................................................................................................................25 8.2 Display function .........................................................................................................................25 8.3 Main Protection .........................................................................................................................26 8.4 Operation Modes and Functions ...............................................................................................27 9. Troubleshooting......................................................................................................................................... 34 9.1 Indoor Unit Error Display ...........................................................................................................34 9.2 Diagnosis and Solution..............................................................................................................35 1. Precaution
1.1 Safety Precaution

To prevent injury to the user or other people and property damage, the following
instructions must be followed.

Incorrect operation due to ignoring instruction will cause harm or damage.

Before service unit, be sure to read this service manual at first.
1.2 Warning
 Installation

Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated
circuit.
There is risk of fire or electric shock.

For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized
service center.
Do not disassemble or repair the product, there is risk of fire or electric shock.

Always ground the product.
There is risk of fire or electric shock.

Install the panel and the cover of control box securely.
There is risk of fire of electric shock.

Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.

Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.

Do not modify or extend the power cable.
There is risk of fire or electric shock.

Do not install, remove, or reinstall the unit by yourself(customer).
There is risk of fire, electric shock, explosion, or injury.

Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the
1
condenser and evaporator.

For installation, always contact the dealer or an Authorized service center.
There is risk of fire, electric shock, explosion, or injury.

Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.

Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure,
and personal injury.

Do not let the air conditioner run for a long time when the humidity is very high and a
door or a window is left open.
Moisture may condense and wet or damage furniture.

Take care to ensure that power cable could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.

Do not place anything on the power cable.
There is risk of fire or electric shock.

Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.

Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.

Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.

Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.

Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.

Do not use the product in a tightly closed space for a long time.
Oxygen deficiency could occur.

When flammable gas leaks, turn off the gas and open a window for ventilation before
turn the product on.
Do not use the telephone or turn switches on or off.
2
There is risk of explosion or fire.

If strange sounds, or small or smoke comes from product. Turn the breaker off or
disconnect the power supply cable.
There is risk of electric shock or fire.

Stop operation and close the window in storm or hurricane. If possible, remove the
product from the window before the hurricane arrives.
There is risk of property damage, failure of product, or electric shock.

Do not open the inlet grill of the product during operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.

When the product is soaked (flooded or submerged), contact an Authorized service
center.
There is risk of fire or electric shock.

Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.

Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electric shock.

Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.

When the product is not be used for a long time, disconnect the power supply plug or
turn off the breaker.
There is risk of product damage or failure, or unintended operation.

Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
 CAUTION

Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.

Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.

Keep level even when installing the product.
3
It can avoid vibration of water leakage.

Do not install the product where the noise or hot air from the outdoor unit could damage
the neighborhoods.
It may cause a problem for your neighbors.

Use two or more people to lift and transport the product.
Avoid personal injury.

Do not install the product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operation.
 Operational

Do not expose the skin directly to cool air for long periods of time. (Do not sit in the
draft).
This could harm to your health.

Do not use the product for special purposes, such as preserving foods, works of art, etc.
It is a consumer air conditioner, not a precision refrigerant system.
There is risk of damage or loss of property.

Do not block the inlet or outlet of air flow.
It may cause product failure.

Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.

Do not touch the metal parts of the product when removing the air filter. They are very
sharp.
There is risk of personal injury.

Do not step on or put anything on the product. (outdoor units)
There is risk of personal injury and failure of product.

Always insert the filter securely. Clean the filter every two weeks or more often if
necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or
damage.

Do not insert hands or other object through air inlet or outlet while the product is
4
operated.
There are sharp and moving parts that could cause personal injury.

Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.

Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.

Replace the all batteries in the remote control with new ones of the same type. Do not
mix old and mew batteries or different types of batteries.
There is risk of fire or explosion.

Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.

If the liquid from the batteries gets onto your skin or clothes, wash it well with clean
water. Do not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards
5
2. Function
Model Names of Indoor/Outdoor Units
Full DC Inverter
Capacity
Model
Indoor units
Outdoor units
7k
MSX-07HRFN1-QE4(B)
MSX-07HRFN1-QE4(B)
MOC1-07HFN1-QE4
9k
MSX-09HRDN1-QC2(A)
MSX-09HRDN1-QC2(A)
MOR-09HDN1-QC2
9K
MSX-09HRFN1-QE0(B)
MSX-09HRFN1-QE0(B)
MOC1-09HFN1-QE0
12k
MSX-12HRFN1-QD2(B)
MSX-12HRFN1-QD2(B)
MOC1-12HFN1-QD2
6
Indoor unit
LCD display
Operation by remote controller.
Golden fin (Optional)
Anti-freezing control in cooling
Prevent the water being frozen on evaporator by
checking the evaporator pipe temperature
Ionizer/Plasma(optional)
Time Delay Safety
Sleep mode auto control
Indoor fan speed control
Turbo wind, high, med, low, breeze.
Follow me
Two-direction air vane
The unit will decide the louver direction according
to operation mode.
Independent dehumidification
Self-diag. function
Anti-cold function
The function is usually used in rainy
days in springtime or damp areas.
Prevent the cold wind at the
beginning of unit start.
Auto defrost
Air flow Direction
The louver can be set at the desired position
or swing up and down automatically
Auto-restar
t
Auto mode
Flexible wiring connection
Temp. Compensation
7
Outdoor unit
Power relay control
Low noise air flow system
Hydrophilic aluminum fin
The hydrophilic fin can improve the heating efficiency at operation mode.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Made from electrolytic zinc steel sheet and anti-rust coated components.
Valve protection
It protects the valves and prevents water from dripping.
Compressor crank case heater
Driving heating at -15℃
8
3. Dimension
3.1 Indoor Unit
Model
W
H
D
MSX-07HRFN1-QE4(B)
850
225
305
MSX-09HRFN1-QE0(B)
850
225
305
MSX-09HRDN1-QC2(A)
710
194
250
MSX-12HRFN1-QD2(B)
850
225
305
9
3.2 Outdoor Unit
Model
W
H
D
B
C
F
MSX-09HRDN1-QC2(A)
670
265
540
481
276
50
MSX-07HRFN1-QE4(B)
MSX-09HRFN1-QE0(B)
MSX-12HRFN1-QD2(B)
760
285
590
530
290
63
10
4. Refrigerant Cycle Diagram
11
5. Wiring Diagram
5.1 Indoor Unit
MSX-07HRFN1-QE4(B);MSX-09HRFN1-QE0(B);MSX-12HRFN1-QD2(B)
12
MSX-09HRDN1-QC2(A)
13
5.2 Outdoor Unit
MSX-07HRFN1-QE4(B);MSX-09HRFN1-QE0(B);MSX-12HRFN1-QD2(B)
14
MSX-09HRDN1-QC2(A)
15
6. Installation details
6.1 Wrench torque sheet for installation
Additional tightening
Outside diameter
Torque
torque
mm
inch
Ф6.35
1/4
Ф9.52
3/8
N.cm
N.cm
1500
1600
(153kgf.cm)
(163kgf.cm)
2500
2600
(255kgf.cm)
(265kgf.cm)
6.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Rated current of appliance
Minimum nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1.0
>10 and ≤16
1.5
>16 and ≤25
2.5
The cable size and the current of the fuse or switch are determined by the maximum current indicated
on the nameplate which located on the side panel of the unit. Please refer to the nameplate before
selecting the cable, fuse and switch.
16
6.3 Pipe length and the elevation
The pipe length and refrigerant amount:
Model
Connective pipe length
Air purging
Additional amount of refrigerant
All
Less than 5m
Use vacuum pump
------------------
All
More than 5m
Use vacuum pump
(Pipe length – 5) × 20g/m
Model
Standard length (m)
Max.Elevation (m)
Max.Length (m)
All
5
8
20
Caution:
Capacity test is based on standard length and maximum allowance length is based on system
reliability.
Oil trap should be installed per 5-7 meters.
6.4 Air purging with vacuum pump
Air and moisture in the refrigerant system have undesirable effects as below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may freeze and block capillary tubing.
● Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
17
Air purging with vacuum pump
(Indoor unit)
(Outdoor unit)
(Liquid side)
Two-way valve
Close
(Gas side)
Three-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-76cmHg
Lo
Handle Lo
Charge hose
Hi
Handle Hi
Charge hose
Vacuum
pump
adaptor
Vacuum
pump
1. Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold valve
charge.
2. Connect the charge hose connection to the vacuum pump.
3. Fully open the handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the
Lo valve on the gas pipe side and check the air is entering. (Operation noise of the vacuum pump
changes and a compound meter indicates 0 stead of minutes)
5. After the evacuation is complete, fully close the handle Lo valve of the manifold valve and stop the
operation of the vacuum pump. Make evacuation for 15 minutes or more and check the compound
meter indicates -76cmHg.
6. Turn the stem of the Hi valve about 45°counterclockwise for 6 or 7seconds after the gas coming
out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a
little higher than the atmosphere pressure.
7. Remove the charge hose from the Lo pressure charge hose.
8. Fully open the Hi and Lo packed valve.
9. Securely tighten the cap of the packed valve.
Gas leak check
Soap water method
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
18
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles
come out, the pipes have leakage.
6.5 Pumping down (Re-installation)
Procedure
1. Confirm that both the 2-way and 3-way valves are set to the opened position.
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way
valve.
Connect the charge hose with the push pin to the gas service port.
5. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
6. Set the 2-way valve to the close position.
7. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
8. Immediately set the 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
19
Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service port caps.
Use a torque wrench to tighten the service port cap.
Be sure to check for gas leakage.
6.6 Re-air purging (Re-installation)
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the closed position.
2. Connect the charge set and a charging cylinder to the service port of the 3-way valve.
Leave the valve on the charging cylinder closed.
3. Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on
the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut to on the 2-way valve.
4. Check the gas leakage.
Check the flare connections for gas leakage.
5. Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicates 0.3 to 0.5
20
Mpa.
6. Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position.
Be sure to use a hexagonal wrench to operate the valve stems.
7. Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap.
Be sure to check the gas leakage.
6.7 Balance refrigerant of the 2-way, 3-way valves
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the open position.
2. Connect the charge set to the 3-way valve’s service port.
Leave the valve on the charge set closed.
Connect the charge hose with the push pin to the service port.
3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge indicates
0.05 to 0.1Mpa.
If the pressure when the air conditioner is not running is higher than 0.1Mpa, discharge the refrigerant
until the gauge indicates 0.05 to 0.1 Mpa. Discharge the refrigeration gradually; if it is discharged too
suddenly, the refrigeration oil sill be discharged.
21
6.8 Evacuation
Procedure:
1. Connect the vacuum pump to the charge set’s centre hose.
2. Evacuation for approximately one hour.
Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less].
3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge
needle does not move (approximately 5 minutes after turning off the vacuum pump).
4. Disconnect the charge hose from the vacuum pump.
22
6.9 Gas charging
Procedure:
1. Connect the charge hose to the charging cylinder.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom
of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.
2. Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge
the air (be careful of the liquid refrigerant).
3. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
4. Disconnect the charge hose from the 3-way valve’s service port immediately.
Stopping partway will allow the refrigerant to be discharged.
If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
5. Mounted the valve stem caps and the service port
Use torque wrench to tighten the service port cap.
Be sure to check for gas leakage.
23
7. Operation characteristics
CAUTION:
1. If air conditioner is used outside of the above conditions, certain safety protection features may
come into operation and cause the unit to function abnormally.
2. Room relative humidity less than 80%. If the air conditioner operates in excess of this figure, the
surface of the air conditioner may attract condensation. Please set the vertical air flow louver to its
maximum angle (vertically to the floor), and set HIGH fan mode.
3. Optimum performance will be achieved within this operating temperature.
24
8. Electronic function
8.1 Abbreviation
T1: Indoor ambient temperature
T2:
Coil temperature of indoor heat exchanger
T3:
Coil temperature of outdoor heat exchanger
T4:
Outdoor ambient temperature
T5:
Compressor discharge temperature
8.2 Display function
Icon explanation on indoor display board.
OPERATION display: Displayed when the air conditioner is in operation.
AUTO operation display: Displayed during Auto operation.
DEFROST operation display (For Heating & Cooling model only):
Displayed when the air conditioner starts defrosting automatically or when the warm air control feature is
activated in heating operation.
TIMER display: Displayed during Timer operation
CLEAN AIR display(optional):
Displayed when Ionizer or Plasma dust collector(depending on models) is activated
TURBO operation display:
Displayed when select TURBO function on cooling operation or on heating operation.
DIGITAL DISPLAY :
Displays the current setting temperature or malfunction code when the air conditioner is in operation. When
SELF CLEAN feature is activated, it displays
“SC”
FAN SPEED display :Displayed the selected fan speed: LOW(
), MED(
) and HIGH(
Operation Frequency display:
This display is separated into five zones. The zones illuminate based on
the compressor current frequency. For example, higher frequency will illuminate more zones.
25
)
8.3 Main Protection
8.3.1 Three Minutes Delay at restart for compressor.
---- 1 minute delay for the 1st time start-up and 3 minutes delay for others.
8.3.2 Temperature protection of compressor top.
---- Top temp. protector cut off for 30s and restart the compressor with 3 minutes delay.
8.3.3 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as
below rules:
----Compressor discharge temp. T5>115
for 5s, compressor stops.
---- 108<T5<115 , decrease the frequency to the lower level every 3 minutes.
---90<T5<105 , keep running at the current frequency.
----T5<90 , no limit for frequency.
8.3.4 Fan Speed is out of control.
----When Indoor Fan Speed keeps too low or too high for certain time, the unit will stop and the LED
will display the failure
8.3.5 Inverter module Protection.
----The Inverter module itself has a protection function against current, voltage and temperature. If
these protections happen, the corresponding code will display on indoor unit.
8.3.6 Indoor fan delayed open function
----When the system starts up, the louver will be active immediately and the indoor fan will open 10s
later.
8.3.7 Compressor preheating functions.
----Preheating permitting condition:
If T4(outdoor ambient temperature)<3
and the machine connects to power supply newly or if T4<3
and compressor has stopped for over 3 hours, the compressor heating cable will work.
----Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
----Preheating release condition:
If T4>5
or the compressor starts running, preheating function will stop.
26
8.3.8 Zero crossing detection error protection
If AC detects time interval is not correct for continuous 20 zero crossing signal, the unit will stop and
the LED will display the failure. The correct zero crossing signal time interval should be between
6-13ms.
8.4 Operation Modes and Functions
8.4.1 Fan mode.
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24
temperature.
8.4.2 Cooling Mode
8.4.2.1 Compressor running rules:
The operation frequency of compressor after starting submits to the following rule.
27
setting
Fmax=F4
45
43
Fmax=F7
40
38
Fmax=F8
30
28
Fmax=F6
22
20
Fmax=F3
If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7
minutes according to outdoor ambient temp. During the 7 minutes, frequency limitation is active.
7 minutes later, the compressor running frequency will be controlled as below:
3.5
A
3.0
B
2.5
C
2.0
D
1.5
E
1.0
F
0.5
-0.5
G
-1.0
H
While
Temp.zone
A
B
C
D
E
F
G
H
Frequency
F8
F8
F7
F6
F5
F3
F1
F0
Note:
When T1-Ts keeps in the same temp.zone for 3 minutes, the compressor will run as the below rules:
A~E: Increase the frequency to the higher level until to F8.
F: Keep the current frequency.
G: Decrease the frequency to the lower level until to F1.
H: Run at F1 for 1h.(if T1-Ts<-2 , compressor will stop)
Meanwhile, the compressor running frequency is limited by the current.
28
Off
I3COOL
Decrease
I2COOL
Hold
I1COOL
Resume
Off: Compressor stop.
Decrease: Decrease the running frequency to the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
Note:
When AC is in “hold” zone for 3 minutes, the compressor frequency will rise to the higher level.
(frequency will increase twice at most)
8.4.2.2 Outdoor fan running rules:
22
H igh
20
Low
8.4.2.3 Indoor fan running rules
In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and
auto.
Auto fan in cooling mode acts as follow:
29
8.4.2.4 Condenser high temperature T3 protection.
When 55 <T3<60 , the compressor frequency will decrease to the lower level until to F1 and then
runs at F1.
When T3<54 , the compressor will keep running at the current frequency.
When T3<52 , the compressor will not limit the frequency and resume to the former frequency.
When T3>60
for 5 seconds, the compressor will stop until T3<52 .
8.4.2.5 Evaporator low temperature T2 protection.
When T2<0 , the compressor will stop and restart when T2>=5 .
When 0℃≦T2<4 , the compressor frequency will be limited and decreased to the lower level every
minute.
When 4 ≤T2≤7 , the compressor will keep the current frequency.
When T2>7 , the compressor frequency will not be limited.
8.4.3 Auto-mode
This mode can be chosen with remote controller and the setting temperature can be changed between
17~30 .
In auto mode, the machine will choose the running mode according to ∆T (∆T =T1-Ts).
∆T=T1-Ts
Running mode
∆T>1
Cooling
∆T≤1
Fan-only
Indoor fan will run at auto fan of the relevant mode.
The louver operate same as in relevant mode.
If the setting temperature is modified, the machine will rechoose running function.
8.4.4 Drying mode
8.4.4.1
Indoor fan speed is fixed at breeze and can’t be changed. The louver angle is the same as
cooling mode.
8.4.4.2
Compressor running rules
30
2.5
F3
2.0
1.5
F2
1.0
0.5
F1
0.0
F1
8.4.4.3
Overlow room temperature protection
In drying mode, if room temperature is lower than 10 , the compressor will stop and not resume until
room temperature exceeds 12 .
8.4.4.4
Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit
frequency limit are active and the same as that in cooling mode.
8.4.4.5
The outdoor fan operates the same as in cooling mode.
8.4.5 Forced operation function
8.4.5.1Enter forced operation function:
When the machine is off, pressing the touch button will carry the machine to forced auto mode, after
this, if pressing the button once again within 5 seconds, the machine will turn into forced cooling mode.
In forced auto, forced cooling or any other operation mode, pressing touch button will turn off the
machine.
8.4.5.2 In forced operation mode, all general protections and remote control are available.
8.4.5.3 Operation rules:
Forced cooling mode:
The compressor runs at F2 frequency and indoor fan runs as breeze.After running for 30 minutes. the
machine will turn to auto mode as 24
setting temperature.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode with 24
setting temperature.
8.4.6 Timer function
8.4.6.1 Timing range is 24 hours.
8.4.6.2 Timer on.
The machine will turn on automatically when reaching the setting time.
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8.4.6.3 Timer off.
The machine will turn off automatically when reaching the setting time.
8.4.6.4 Timer on/off.
The machine will turn on automatically when reaching the setting “on” time, and
then turn off automatically when reaching the setting “off” time.
8.4.6.5 Timer off/on. The machine will turn off automatically when reaching the setting “off” time, and
then turn on automatically when reaching the setting “on” time.
8.4.6.6 The timer funtion will not change the AC current operation mode. Suppose AC is off now, it will
not start up firstly after setting the “timer off” function. And when reaching the setting time, the timer
LED will be off and the AC running mode has not been changed.
8.4.6.7 The setting time is relative time.
8.4.7 Sleep function mode
8.4.7.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off.
8.4.7.2. Operation process in sleep mode is as follow:
When cooling, the setting temperature rises 1 (be lower than 30 ) every one hour, 2 hours later the
setting temperature stops rising and indoor fan is fixed as low speed.
8.4.7.3 Timer setting is available
8.4.7.4 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the
timing is less than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing
is more than 7 hours, the machine will not stop until reaches the setting time in sleep mode.
8.4.8 Auto-Restart function
The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart
module. In case of a sudden power failure, the module memorizes the setting conditions before the
power failure. The unit will resume the previous operation setting (not including Swing function)
automatically after 3 minutes when power returns.
If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30 minutes
and turn to auto mode as 24
setting temp.
If AC is off before power off and AC is required to start up now, the compressor will have 1 minute
delay when power on. Other conditions, the compressor will have 3 minutes delay when restarts.
8.4.9 Ionizer/Plasma dust collector function (optional)
The indoor unit is equipped with Ionizer, which is controlled by the CLEAN AIR button on the remote
controller. When the unit is turned on, press the CLEAN AIR button to activate the function. Press it
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again to stop the function. During the time when Ionizer is controlled by remote controller, Ionizer will
be turned off automatically if indoor fan stops running due to malfunctions or anti-cold-wind. When
indoor fan restarts after malfunctions being eliminated and anti-cold-wind being released, Ionizer will
be available again.
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9. Troubleshooting
9.1 Indoor Unit Error Display
Display
LED STATUS
E0
EEPROM parameter error
E1
Indoor / outdoor units communication protection
E2
Zero-crossing signal error
E3
Indoor fan speed out of control
E5
Open or short circuit of outdoor temperature sensor
E6
Open or short circuit of room or evaporator temperature sensor
E7
Outdoor fan speed out of control
P0
IBM malfunction or IGBT over-strong current protection
P1
Over voltage or too low voltage protection
P2
Temperature protection of compressor top.
P4
Inverter compressor drive error
Note: E4 & P3:
Reserved function.
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9.2 Diagnosis and Solution
9.2.1 EEPROM parameter error diagnosis and solution
Shut off the power supply and turn on it 5s later
Replace indoor PCB
The problem comes out again
Is the EEPROM chip plugged in indoor PCB well?
Replace the main PCB of indoor unit
35
No
Correct the connection
9.2.2 Indoor / outdoor units communication protection error diagnosis and solution
Turn off the power supply, after 1 minute, connect the
power supply , turn on the unit with remote controller
The unit does not work normally.
Check the wiring between indoor and outdoor
unit. Is the connection of L, N, S and GND good?
No
Reconnect and retest
Yes
Is the LED4(red) bright and LED1(yellow)
blinking on outdoor PCB?
Yes
No
Replace indoor
PCB and repower
The unit does not
work normally.
The power supply for outdoor PCB is fail.
Check the wiring on outdoor PCB
comparing with wiring plate. Is the
connection good?
Yes
Replace outdoor e-box.
No
Correct the connection.
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9.2.3 Fan speed out of control diagnosis
Shut off the power supply and turn on it 5s later
The unit does not work normally
Turn off the unit, rotate the cross
fan.Does it rotate freely?
No
Disassemble the connection between
fan and motor, check if the bearing is
normal. If not, change the bearing.If
yes, follow the below step.
Yes
Is the fan motor connector and
connection good?
Yes
Is the voltage being applied to the fan
motor?
Yes
Replace the fan motor
No
Replace the PCB
9.2.4 Open or short circuit of temperature sensor diagnosis and solution.
Check the connections between
the sensors and the PCB. Are the
connections good?
Yes
Replace the sensor and check if
the errors happen again?
Yes
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Replace outdoor PCB
9.2.5 IGBT over-strong current protection diagnosis and solution.
Check whether the connections between
outdoor PCB and IPM are good?
Yes
No
Check whether the IPM is fixed to radiator
tightly
Replae the IPM
Fastening the IPM to the radiator
The unit does not work normally
Replace the compressor
9.2.6 Over voltage or too low voltage protection diagnosis and solution.
No
Is the power supply good?
Make sure the power supply is normal.
Yes
Replace the outdoor e-box.
9.2.7 High temperature protection of compressor top diagnosis and solution.
Does compressor operate?
No
Yes
Is refrigerant circulation
volume normal?
Reconnect it
Yes
Is protector normal?
No,
Charge refrigerant
Is abnormality the same
after gas charging?
No
Is the connection good?
Yes
Replace the outdoor PCB.
There is block(Such as capillary or
welded points of the pipes.)
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No
Replace it
9.2.8 Inverter compressor drive error diagnosis and solution.
Is the connection of compressor good?
Is the wiring sequence right? The
voltage range proper?
No
Reconnect and retry.
Yes
Replace the outdoor PCB
No
Replace inverter compressor.
9.2.9 Zero crossing detection error
When such failure occurs, the main control board must have fault.
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