Midea IC SI-A-1205 Service 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 elevat ion ..................................................................................................... 15
6.4 Installation for the fir st time ......................................................................................................... 16
6.5 Adding the refrigerant after running t he s ystem for many years ................................................ 19
6.6 Re-installation w hi le t he indoor unit need to be repaired ........................................................... 20
6.7 Re-installation w hi le t he 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
3
1. Precaution
1.1 Safety Precaution
To prevent injury t o t he us er or other people and property damage, the following instructions
must be followed.
Incorrect operation due to ignoring inst ruction will cause harm or damage.
Before service the unit, be sur e to r ead this service manual at first.
1.2 Warning
Installation
Do not use a defective or under rat ed circuit breaker. Use this appliance on a dedicat ed 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 electr ic shock.
Always ground t he product.
There is risk of fire or electric shock.
Install the panel and the cover of control b ox securely.
There is risk of fire of electric shock.
Always instal l a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
Use the correctly rat ed breaker of f use.
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 inst all, 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 p roduct.
Sharp edges could cause injur y, be especially careful of the case edges and t he f ins on the condenser
and evaporator.
4
For installation, always contact the dealer or an authorized service center.
Do not inst all the product on a def ective installation stand.
Be sure the install ation area does not deteriorate with a ge.
If the base collapses, the air conditioner could fall with it, causing pr operty damage, product failure, and
personal injury.
Do not let the air conditioner run for a lo ng time when the humidi ty 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 operat ion.
There is risk of fire or electric shock.
Do not place any t hing 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 electr ic 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 pro duc t .
There is risk of fire or failure of product.
Do not use the pro duc t in a tightly closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off t he gas and open a windo w for ventilation before turn the
product on.
If strange sound s 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 shoc k.
Do not open the inl et gr ill of the product during operation. (Do n ot touch the electrost atic filter, if
5
the unit is so equi pped.)
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 t ogether 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 ti me, disco nnect t he powe r suppl y plug or turn off t he
breaker.
There is risk of product damage or failure, or unintended operation.
Take care to ensure that nob ody could step on or fall onto the outdoor unit.
This could result in person al in jury and product damage.
CAUTION
Always check for gas (refri gerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain h ose t o ensure that water is drained away pr op er l y.
A bad connection may cause water leakage.
Keep level even when installing the product.
It can avoid vibration of wat er lea kage.
Do not inst all the product where t he noise or hot air fr om the outdoor uni t could damage the
neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and t r ansport the product.
Do not install the product where it will be exposed to se a 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 operati on.
6
Operational
Do not expose th e sk i n directly to cool air f or long time. (Do not sit in the draft).
Do not use the product for speci al purposes, such as preserving foo ds, wor ks of ar t 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 i nl e t 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 part s 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 prod uc t . (outdoor units)
Always insert the filt er securely. Clean the filter every two weeks or more often if necessary.
A dirty filter redu ces th e efficiency of the air conditio ner and could c aus e prod uct m alfu nction or da mag e.
Do not insert hands or other objects through air inlet or outl e t while the product is operated.
Do not drink the water drained from the product.
Use a firm stool or ladder when cleanin g or m a i ntaining the pr oduct.
Be careful and avoid pers onal injury.
Replace the all batteries in the remote control with new ones of t he 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 batt er i es in a fire.
They may burn of explode.
If the liquid from t he batt eri es get s o nto y our ski n or cl othes, wa sh it well with c lean water. Do not
use the remote of the batt er i es have leaked.
7
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
8
3. Dimension
3.1 Indoor Unit
D
H
W
L
R
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
9
3.2 Outdoor Unit
More than 30cm
More than 60cm
More than 70cm
More than 30cm
More than 60cm
(Service space)
Fence or
obstacles
10
Model W D H W1 A B
MOR-09HDN1-QC2
660 265 540 732 458 276
MOR-12HDN1-QC2
11
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
12
5. Wiring Diagram
5.1 Indoor Unit
MSIC-09HRDN1-QC2, MSIC-12HRDN1-QC2
13
5.2 Outdoor Unit
MOR-09HDN1-QC2, MOR-12HDN1-QC2
14
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 s pecifications 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 sw it ch.
15
6.3 Pipe length and the elevation
The pipe length and refrigerant amount:
Model
Pipe si ze
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 an d the maximum permissive length is based on the
system reliability.
The oil trap should be inst all ed per 5-7 meters.
16
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 corrosi on of parts in the refrigerant sys t em.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested
and evacuated to remove gas an d m oisture 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 p um p
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 w it h t he push pin of handle lo to the 3-way valves gas service port..
3) Connect the charge hose of ha ndle hi connection to the vacuum pump.
4) Fully open the handle Lo of the ma ni fold valve.
5) Operate the vacuum pum p t o 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
17
the meter does not indicate -0.1Mpa after pum ping 30 minutes, it should be pump ed 20 minutes more. If
the pressure can’t achi eve -0.1Mpa after pum ping 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° counterclo ckwise for 6 or 7seconds after the g as
coming out, then tighten the flare nut again. Ma ke sure the pressur e display in the pressure in dicator is
a little higher than the atmosph er e pr essure. Then remove the c har ge 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 purgi ng by refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed positi on.
2). Connect the charge set and a char ging 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 the n closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tig ht en 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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