Midea IC SI-A-1205 User manual

IC INVERTER SERIES
Service Manual 2012
ICSI-A-1205

CONTENTS
1. Precaution .................................................................................................................................................... 3
1.1 Safety Precaution..........................................................................................................................3
1.2 Warning.........................................................................................................................................3
2. Function........................................................................................................................................................ 7
3. Dimension .................................................................................................................................................... 8
3.1 Indoor Unit.....................................................................................................................................8
3.2 Outdoor Unit..................................................................................................................................9
4. Refrigerant Cycle Diagram ........................................................................................................................11
5. Wiring Diagram .......................................................................................................................................... 12
5.1 Indoor Unit...................................................................................................................................12
5.2 Outdoor Unit................................................................................................................................13
6 Installation Details ...................................................................................................................................... 14
6.1 Wrench torque sheet for installation...........................................................................................14
6.2 Connecting the cables ................................................................................................................14
6.3 Pipe length and the elevation .....................................................................................................15
6.4 Installation for the first time.........................................................................................................16
6.5Adding the refrigerant after running the system for many years ................................................19
6.6 Re-installation while the indoor unit need to be repaired........................................................... 20
6.7 Re-installation while the outdoor unit need to be repaired.........................................................22
7. Operation Characteristics......................................................................................................................... 25
8. Electronic function.................................................................................................................................... 26
8.1 Abbreviation ................................................................................................................................26
8.2 Display function...........................................................................................................................26
8.3 Main Protection...........................................................................................................................27
8.4 Operation Modes and Functions.................................................................................................28
9. Troubleshooting......................................................................................................................................... 42
9.1 Indoor Unit Error Display.............................................................................................................42
9.2 Diagnosis and Solution...............................................................................................................43

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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 the 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 condenser
and evaporator.

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For installation, always contact the dealer or an authorized service center.
Do not install the product on a defective installation stand.
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.
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.
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 electrical 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.
If strange sounds 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

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the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product is soaked, 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.
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.
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.

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Operational
Do not expose the skin directly to cool air for long time. (Do not sit in the draft).
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.
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.
Do not step on or put anything on the product. (outdoor units)
Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
Adirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
Do not insert hands or other objects through air inlet or outlet while the product is operated.
Do not drink the water drained from the product.
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 new 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.

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2. Function
Model Names of Indoor/Outdoor Units
DC
Inverter
Capacity Indoor units Outdoor units
9k MSIC-09HRDN1-QC2 MOR-09HDN1-QC2
12k MSIC-12HRDN1-QC2 MOR-12HDN1-QC2
Concealed display
Super slim
Easily removable filter
Golden fin
Dry and self clean
Compressor Crankcase Heater(O)
Self-diag. function
Vitamin C filter(O)
Valve protection cover
Horizontal &Vertical swing function
Variable fan speeds
High density silver ion filter
Intelligent sleep mode
I mode
Bio filter(O)
Low ambient cooling(O)
O: optional function

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3. Dimension
3.1 Indoor Unit
D
H
W
LR
H
Model
W
H
D
MSIC-09HRDN1-QC2
890 310 150
MSIC-12HRDN1-QC2
Model L R H(mm)
Dimension of
installation hole(mm)
MSIC-09HRDN1-QC2
184 143 45 Φ65
MSIC-12HRDN1-QC2

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3.2 Outdoor Unit
More than 30cm
More than 60cm
More than 70cm
More than 30cm
More than 60cm
(Service space)
Fence or
obstacles

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Model W D H W1 A B
MOR-09HDN1-QC2 660 265 540 732 458 276
MOR-12HDN1-QC2

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4. Refrigerant Cycle Diagram
INDOOR OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
REVERSING VALVE
(Heating Model only)
COOLING
HEATING
ACCUMULATOR

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5. Wiring Diagram
5.1 Indoor Unit
MSIC-09HRDN1-QC2,MSIC-12HRDN1-QC2

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5.2 Outdoor Unit
MOR-09HDN1-QC2, MOR-12HDN1-QC2

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6 Installation Details
6.1 Wrench torque sheet for installation
Outside diameter Torque Additional tightening torque
mm inch N.cm N.cm
Ф6.35 1/4 1500(153kgf.cm) 1600(163kgf.cm)
Ф9.52 3/8 2500(255kgf.cm) 2600(265kgf.cm)
Ф12.7 1/2 3500(357kgf.cm) 3600(367kgf.cm)
Ф15.9 5/8 4500(459kgf.cm) 4700(479kgf.cm)
Ф19 3/4 6500(663kgf.cm) 6700(683kgf.cm)
6.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Rated current of appliance
Nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1
>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.

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6.3 Pipe length and the elevation
The pipe length and refrigerant amount:
Model
Pipe size Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas Liquid
MSIC-09HRDN1-QC2+MOR-09HDN1-QC2 3/8’’
(Ф9.52) 1/4’’ (Ф6.35) 5 8 20 20
MSIC-12HRDN1-QC2+MOR-12HDN1-QC2
Caution:
The capacity test is based on the standard length and the maximum permissive length is based on the
system reliability.
The oil trap should be installed per 5-7 meters.

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6.4 Installation for the first time
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.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles
come out, the pipes have leakage.
1. Air purging with vacuum pump
1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and
3-way valves are set to the closed position.
2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two
-
way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-
0.1M
Pa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three
-way valve

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the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If
the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage
points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump.
Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum
pump).
7) Turn the flare nut of the 3-way valves 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. Then remove the charge hose from the 3 way valve.
8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.
2. Air purging by refrigerant
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.
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 on the 2-way valve.
4). Check the gas leakage.
Check the flare connections for gas leakage.
5). Discharge the refrigerant.

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Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 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 to a torque 18N·m.
Be sure to check the gas leakage.
3. Adding the refrigerant if the pipe length >5m
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.
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 the 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) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
Electronic scale

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6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose
from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the
hose.
7). Mount the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
6.5 Adding the refrigerant after running the system for many years
Procedure:
1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
Connect the charge hose 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) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
Electronic scale

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6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low
side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air
conditioner before disconnecting the hose.
7). Mount the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
6.6 Re-installation while the indoor unit need to be repaired
1. Collecting the refrigerant into the outdoor unit
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). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.
3).Air purging of the charge hose.
Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds
and then close it quickly.
4). Set the 2-way valve to the close position.