Midea MSR1-09CR-NB6 User manual

Cover
MSR1-09CR-NB6 MSR1-09HR-NB6
MSR1-12CR-NB4 MSR1-12HR-NB4
MSR1-18CR-NB4 MSR1-18HR-NB4

Content
2
Content
1. Precaution 2
1.1 Safety Precaution 2
1.2 Warning 2
2. Function 4
3. Dimension 6
3.1 Indoor unit 6
3.2 Outdoor unit 6
4. Refrigerant cycle diagram 9
5. Operation limits 10
5.1 Cooling operation 10
5.2 Heating operation 10
6. Wiring diagram 11
7. Installation details 15
7.1 Wrench torque sheet for installation 15
7.2 Connecting the cables 15
7.3 Pipe length and the elevation 15
7.4 Air purging of the piping and indoor unit 16
7.5 Pumping down (Re-installation) 17
7.6 Re-air purging (Re-installation)18
7.7 Balance refrigerant of the 2-way, 3-way valves 19
7.8 Evacuation 20
7.9 Gas charging 21
8. Electronic function 22
8.1 Proper symbols and their meaning 22
8.2 Function 22
8.3 Protection 22
8.4 Fan-only mode 23
8.5 Cooling mode 23
8.6 Dehumidifying mode 24
8.7 Heating mode 25
8.8 Defrosting mode (available for heating mode) 26
8.9 Auto mode 27
8.10 Force cooling function 27
8.11 Sleep mode 28
8.12 Auto restart function 28
8.13 Turbo mode 28
9. Model and Parameters 29

Content
3
10. Troubleshooting 30
10.1 Display board 30
10.2 Troubleshooting 30
10.3 Diagnostic chart 31
10.4 Resetting phenomenon often occurs during operation. 32
10.5 Operation lamp flashes and Timer lamp off. 32
10.6 Operation lamp flashes and Timer lamp on. 32
10.7 Operation lamp off and Timer lamp flashes 33
10.8 Operation lamp on and Timer lamp flashes 33
10.9 Operation lamp flashes, Timer lamp flashes . 33
11. Characteristic of temperature sensor 34

Service manual
2
1. Precaution
1.1 Safety Precaution
zTo prevent injury to the user or other people and property damage, the following instructions must be
followed.
zIncorrect operation due to ignoring instruction will cause harm or damage.
zBefore service unit, be sure to read this service manual at first.
1.2 Warning
¾Installation
zDo not use a defective or underrated circuit
breaker. Use this appliance on a dedicated
circuit.
There is risk of fire or electric shock.
zFor 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.
zAlways ground the product.
There is risk of fire or electric shock.
zInstall the panel and the cover of control box
securely.
There is risk of fire of electric shock.
zAlways install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or
electric shock.
zUse the correctly rated breaker of fuse.
There is risk of fire or electric shock.
zDo not modify or extend the power cable.
There is risk of fire or electric shock.
zDo not install, remove, or reinstall the unit by
yourself (customer).
There is risk of fire, electric shock, explosion, or
injury.
zBe caution when unpacking and installing the
product.
Sharp edges could cause injury, be especially
careful of the case edges and the fins on the
condenser and evaporator.
zFor installation, always contact the dealer or
an Authorized service center.
There is risk of fire, electric shock, explosion, or
injury.
zDo not install the product on a defective
installation stand.
It may cause injury, accident, or damage to the
product.
zBe 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.
zDo not let the air conditioner run for a long
time when the humidity is very high and a door
or a windows is left open.
Moisture may condense and wet or damage
furniture.
zTake care to ensure that power cable could not
be pulled out or damaged during operation.
There is risk of fire or electric shock.
zDo not place anything on the power cable.
There is risk of fire or electric shock.
zDo not plug or unplug the power supply plug
during operation.
There is risk of fire or electric shock.
zDo not touch (operation) the product with wet
hands.
There is risk of fire or electric shock.
zDo not place a heater or other appliance near
the power cable.
There is risk of fire and electric shock.
zDo not allow water to run into electric parts.
It may cause fire, failure of the product, or electric
shock.
zDo not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
zDo not use the product in a tightly closed
space for a long time.
Oxygen deficiency could occur.
zWhen 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.
There is risk of explosion or fire.
zIf 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.

Service manual
2
zStop 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.
zDo 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.
zWhen the product is soaked (flooded or
submerged), contact an Authorized service
center.
There is risk of fire or electric shock.
zBe caution that water could not enter the
product.
There is risk of fire, electric shock, or product
damage.
zVentilate the product from time to time when
operating it together with a stove, etc.
There is risk of fire or electric shock.
zTurn the main power off when cleaning or
maintaining the product.
There is risk of electric shock.
zWhen 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.
zTake care to ensure that nobody could step on
or fall onto the outdoor unit.
This could result in personal injury and product
damage.
¾CAUTION
zAlways check for gas (refrigerant) leakage
after installation or repair of product.
Low refrigerant levels may cause failure of product.
zInstall the drain hose to ensure that water is
drained away properly.
A bad connection may cause water leakage.
zKeep level even when installing the product.
To avoid vibration of water leakage.
zDo 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.
zUse two or more people to lift and transport
the product.
Avoid personal injury.
zDo 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.

Service manual
3
¾Operational
zDo 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.
zDo 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.
zDo not block the inlet or outlet of air flow.
It may cause product failure.
zUse 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.
zDo not touch the metal parts of the product
when removing the air filter. They are very
sharp.
There is risk of personal injury.
zDo not step on pr put anything on the product.
(outdoor units)
There is risk of personal injury and failure of
product.
zAlways 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.
zDo not insert hands or other object through air
inlet or outlet while the product is operated.
There are sharp and moving parts that could cause
personal injury.
zDo not drink the water drained from the
product.
It is not sanitary could cause serious health issues.
zUse a firm stool or ladder when cleaning or
maintaining the product.
Be careful and avoid personal injury.
zReplace 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.
zDo not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.
They may burn of explode.
zIf 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.

Service manual
4
2. Function
The function will be
operate in any operation
Indoor unit
Operation ON/OFF by remote controller
Room temperature sensor.
Pipe temperature sensor.
Sensing by room temperature
Maintain the room temperature in accordance with the setting temperature.
Room temperature control
Indoor fan is delayed for 5 sec at the
starting
Starting temperature control
Restarting is for approx. 3
minutes..
Time Delay Safety control
high, med, low, breeze.
Indoor fan speed control
Light up in the VLED for each operation mode.
The unit will decide the louver direction according to operation mode.
Two-direction air vane
The fan is turn to low speed (cooling/heating).
The unit will be turn off at the seventh hour.
Sleep mode auto control
The function is usually used in rainy days in
springtime or damp areas.
Independent dehumidification
Operation indication Lamps (VLED)
The louver can be set at the desired position or swing up
and down automatically
Air flow Direction control
The unit can be change by the room temperature.
Auto mode
Easy clean panel
Flexible wiring connection
Defrost mode
Prevent the cold wind at
the beginning of unit
Anti-cold function
Auto-restart function
Self-diag. function
Turbo mode

Service manual
5
The unit has 3 mins delay between continuously ON/OFF operations.
Outdoor unit
Power relay control
Bird tail propeller fan makes the outdoor unit run more quietly.
Low noise air flow system
The hydrophilic fin can improve the heating efficiency at operation mode.
Hydrophilic aluminum fin
It is only operated in the heating operation mode except defrosting operation.
Discharge pipe temperature protect
Anti-rust cabinet
Valve protection cover
4 way valve control

Service manual
6
3. Dimension
3.1 Indoor unit
1.3
3.2 Outdoor unit
Dimension
Mode W H D
9/12K 790 275 195
18K 928 275 195
Dimension
Mode
W H D L1 L2 L3
9K 700 522 250 458 275 537
12K 700 522 250 458 275 537
18K 780 540 266 549 290 555

Service manual
7
Specification：
MSR1-09CR-NB6 MSR1-09HR-NB6
Ph-V-Hz 1Ph, 220-230V~, 60Hz 1Ph, 220-230V~, 60Hz
Capacity Btu/h 9000 9000
Input W 1011 1011
Rated current A 4.4 4.4
EER Btu/w.h 8.9 8.9
Capacity Btu/h —— 10000
Input W —— 1052
Rated current A —— 4.45
COP Btu/w.h —— 9.5
W 1300 1300
A6.3 6.3
A26 26
Model 2P15S236A1E 2P15S236AIE
Type Rotary Rotary
Brand GD MATSUSHITA GD MATSUSHITA
Capacity Btu/h 10130 10130
Input W 930 930
Rated current(RL
A
A4.1 4.1
Locked rotor Amp( A 26 26
Thermal protector MRA99027 MRA99027
Capacitor μF30μF/330V 30μF/330V
Refrigerant oil ml 270 270
Model RPG13M RPG13M
Brand Welling Welling
Input W 35W/1520RPM 35W/1520RPM
Capacitor μF1.5μF/450V 1.5μF/450V
Speed(hi/mi/lo) r/min 1250/1100/850 1250/1100/850
m3/h 450/400/350 450/400/350
dB(A) 39/36/32 39/36/32
Dimension (W×H×
D
mm 790×275×190 790×275×190
Packing (W×H×D mm 865×350×265 865×350×265
Net/Gross weight Kg 8.5/10.5 8.5/10.5
Model YDK30-6B YDK30-6B
Brand Welling Welling
Input W 72 72
Capacitor μF2.5μF/450V 2.5μF/450V
Speed r/min 860 860
m3/h 1800 1800
dB(A) 53 53
Dimension(W×H×
D
mm 700×535×250 700×535×250
Packing (W×H×D
)
mm 815×580×325 815×580×325
Net/Gross weight Kg 28/31 28/31
gR22/580 R22/700
MPa 2.6 2.6
Liquid side/ Gas si
d
mm(inch) Ф6.35/Ф9.53 Ф6.35/Ф9.53
Max. refrigerant pi
p
m10 10
Max. difference in
l
m5 5
℃17-30 17-30
℃18-45 -7 - 45
m2 14~20 14~20
Refrigerant p
Operation temp
Ambient temp
Application area
Indoor unit
Outdoor fan
m
Outdoor noise level
Outdoor unit
Model
Power supply
Cooling
Heating
Max. input consumption
Max. current
Starting current
Design pressure
Refrigerant type
Outdoor air flow
Compressor
Indoor fan m
o
Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)
Note:
The noise date is base on hemi-anechoic chamber during actual operation, these values are normally somewhat different as a result
of ambient condition.

Service manual
8
The above design and specifications are subject to change without prior notice for product improvement.
MSR1-12CR-NB4 MSR1-12HR-NB4 MSR1-18CR-NB4 MSR1-18HR-NB4
Ph-V-Hz 1Ph, 220-230V~, 60Hz 1Ph, 220-230V~, 60Hz 1Ph, 220-230V~, 60Hz 1Ph, 220-230V~, 60Hz
Capacity Btu/h 11000 11000 16000 16000
Input W 1350 1350 1700 1700
Rated current A 6.2 6.2 8.7 8.7
EER Btu/w.h 8.2 8.2 9.4 9.4
Capacity Btu/h —— 12000 —— 17500
Input W —— 1300 —— 17500
Rated current A —— 6—— 8.2
COP Btu/w.h —— 2.6 —— 3.0
W1650 1650 2200 2200
A8.8 8.8 10 10
A30 30 42 42
Model 44B124IXA 44B124IXA QJ250KBE QJ250KBE
Type Rotary Rotary Rotary Rotary
Brand SAMSUNG SAMSUNG LG LG
Capacity Btu/h 17700 17700
Input W 1606 1606
Rated current(RL
A
A7.5 7.5
Locked rotor Amp( A 42 42
Thermal protector MRA12107 OR B273-
150-141E
MRA12107 OR B273-
150-141E
Capacitor μF3535
Refrigerant oil ml SUNISO 4GSI 410 SUNISO 4GSI 410
Model RPG13M RPG13M RPG28E RPG28E
Brand Welling Welling Welling Welling
Input W 35W/1520RPM 35W/1520RPM 55W/1180RPM 55W/1180RPM
Capacitor μF1.5μF/450V 1.5μF/450V 1.5UF/450V 1.5UF/450V
Speed(hi/mi/lo) r/min 1220/1100/850 1220/1100/850 1220/1100/850 1220/1100/850
m3/h 480/432/335 480/432/335 780/703/550 780/703/550
dB(A) 43/41/33 43/41/33 44.8/42.6/36 44.8/42.6/36
Dimension (W×H×
D
mm 790×275×190 790×275×190 928×198×275 928×198×275
Packing (W×H×D mm 865×350×265 865×350×265 1015×265×350 1015×265×350
Net/Gross weight Kg 9/11 9/11 10/13.5 10/13.5
Model YDK30-6B YDK30-6B YDK36-6B YDK36-6B
Brand Welling Welling Welling Welling
Input W 72 72 85 85
Capacitor μF2.5μF/450V 2.5μF/450V 2.5μF/450V 2.5μF/450V
Speed r/min 860 860 930 930
m3/h 1500 1500 2000 2000
dB(A) 57 57 58 58
Dimension(W×H×
D
mm 700×535×250 700×535×250 780×540×250 780×540×250
Packing (W×H×D
)
mm 815×580×325 815×580×325 910×335×575 910×335×575
Net/Gross weight Kg 27/29 28/30 34/37 35/38
gR22/650 R22/850 R22/1150 R22/1280
MPa 2.6 2.6 2.6 2.6
Liquid side/ Gas si
d
mm(inch) Ф6.35/Ф12.7 Ф6.35/Ф12.7 Ф6.35/Ф12.7 Ф6.35/Ф12.7
Max. refrigerant pi
p
m10 10 15 15
Max. difference in
l
m5 5 8 8
℃17~30 17~30 17~30 17~30
℃18~ 45 -7~45 18~ 45 -7~45
m2 18~24 18~24 26~35 26~35
Be checked Be checked
Refrigerant p
Operation temp
Ambient temp
Application area
Indoor unit
Outdoor fan
m
Outdoor noise level
Outdoor unit
Model
Power supply
Cooling
Heating
Max. input consumption
Max. current
Starting current
Design pressure
Refrigerant type
Outdoor air flow
Compressor
Indoor fan m
o
Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)
Note:
The noise date is base on hemi-anechoic chamber during actual operation, these values are normally somewhat different as a result
of ambient condition.
The above design and specifications are subject to change without prior notice for product improvement.

Service manual
9
4. Refrigerant cycle diagram
¾Cooling only
¾Heat pump mode

Service manual
10
5. Operation limits
5.1 Cooling operation
Outdoor unit air temp.℃DB
Indoor air temp. ℃DB
Note: The chart is the result from the continuous operation under constant air temperature
conditions. However, excludes the initial pull-down stage.
5.2 Heating operation
Indoor air temp. ℃DB
Outdoor unit air temp.℃DB
Note: The chart is the result from the continuous operation under constant air temperature
conditions. However, excludes the initial pull-down stage.

Service manual
11
6. Wiring diagram
Intdoor：
MSR1-09CR-NB6，MSR-12CR-NB4(6)
Outdoor :
MSR1-09CR-NB6，MSR1-12CR-NB4(6)
Indoor:
MSR1-09HR-NB6，MSR1-12HR-NB4(6)

Service manual
12
Outdoor：
MSR1-09HR-NB6，MSR1-12HR-NB4(6)
Indoor：-
MSR1-18CR-NB4(6)

Service manual
13
Outdoor：
MSR1-18CR-NB4(6)
Indoor：
MSR1-18HR-NB4(6)

Service manual
14
Outdoor:
MSR1-18HR-NB4(6)

Service manual
15
7. Installation details
7.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kg.m
φ6.35 1/4 1.8
φ9.52 3/8 4.2
φ12.7 1/2 5.5
7.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K 18K
mm21.0 1.0 1.5 2.5
7.3 Pipe length and the elevation
Pipe size
Capacity
Btu/h GAS LIQUID
Standard
length
(m)
Max.
Elevatio
n
B (m)
Max.
Pipe
length
A (m)
Additional
refrigerant
(g/m)
7K~9K 3/8’’ (φ9.52) 1/4’’ (φ6.35) 5 5 10 30
12K 1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 5
1030
18K 1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 8 15 30
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
In case that
more than

Service manual
16
7.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak
detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping,
it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that
it prevents the gas leakage from the refrigeration cycle.
Procedure
Recheck the piping connections.
Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait 10
seconds, and then set it to closed position.
Be sure to use a hexagonal wrench to operate
the valve stem
Check for gas leakage.
Check the flare connection for gas leakage
Purge the air from the system.
Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
Using the hexagonal wrench to press the
valve core pin, discharge for three seconds
and then wait for one minute.
Use torque wrench to tighten the service port
cap to a torque of 1.8 kg.m. (18n.m)
Set the 3-way valve to the opened position.
Mounted the valve stem nuts to the 2-way and
3-way valves.
Check for gas leakage.
At this time, especially check for gas leakage
from the 2-way and 3-way stem nuts, and from
the service port.
Caution:
If gas leakage is discovered in step (3) above,
take the following measures.
If the leaks stop when the piping connections
are tightened further, continue working from
step (4).
If the gas leaks do not stop when the
connections are retightened, repair the
location of the leak, discharge all of the gas
through the service port, and then recharge
with the specified amount of gas from a gas
cylinder.

Service manual
17
7.5 Pumping down (Re-installation)
Procedure
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.
Operate the unit for 10 to 15 minutes.
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.
Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
Set the 2-way valve to the close position.
Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
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.
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 to a torque of 1.8 kg.m.
Be sure to check for gas leakage.