SERVICE MANUAL
RMI-1103-A
SERVICE MANUAL
MIDEA AIRCONDITIONER
EUROPE MARKET
DC INVERTER MULTI TYPE
R DC INVERTER MULTI SERIES
2. Function
2.1 Model Names of Indoor units
Capacity
DC
Indoor units
7k
MDSRI-07HRDN1
Inverter
Multi
9k
MDSRI-09HRDN1
12k
MDSRI-12HRDN1
18k
MDSRI-18HRDN1
Series
6
2.2 Product features
Indoor unit
Operation by remote controller
Sensing by temperature sensor
Room temperature control
Maintain the room temperature in accordance
with the setting temperature.
Ionizer(optional)
Anti-freezing control in cooling
Time Delay Safety control
Golden fin(optional)
Indoor fan speed control
high, med, low, breeze,auto
Tele Remote control
(Optional)
Two-direction air vane
The unit will decide the louver direction
according to operation mode.
Sleep mode auto control
Self-diag. function
Anti-cold function
Independent dehumidification
Prevent the cold wind at the
beginning of unit start.
The function is usually used in rainy
days in springtime or damp areas.
Auto defrost
Air flow Direction
The louver can be set at the desired position
or swing up and down automatically
Auto-restart function
Auto mode
Flexible wiring connection
Temp. Compensation
7
3. Dimension
Model
W
H
D
710
250
189
MDSRI-12HRDN1
790
275
196
MDSRI-18HRDN1
930
275
198
MDSRI-07HRDN1
MDSRI-09HRDN1
Position of installation board
Model
R(mm)
L(mm)
H(mm)
Dimension of installation hole(mm)
MDSRI-07HRDN1
111.5
100
45
φ65
MDSRI-09HRDN1
111.5
100
45
φ65
MDSRI-12HRDN1
83.5
100
45
φ65
MDSRI-18HRDN1
207
150
45
φ65
4. Wiring Diagram
MDSRI-07HRDN1
MSRI-12HRDN1
MDSRI-09HRDN1
MSRI-18HRDN1
5. Operation characteristics
Temperature
Mode
Room temperature
Outdoor temperature
Cooling operation
Heating operation
Drying operation
≥17℃
≤30℃
≥17℃
0℃~50℃
-15℃~24℃
0℃~50℃
CAUTION:
1. If the air conditioner is used beyond the above conditions, certain safety protection features
may come into operation and cause the unit to operate abnormally.
2. The room relative humidity should be less than 80%. If the air conditioner operates beyond 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. The optimum performance will be achieved during this operating temperature zone.
6. Electronic function
6.1 Abbreviation
T1: Indoor ambient temperature
T2:
Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet.
T3:
Coil temperature of outdoor heat exchanger
T4:
Outdoor ambient temperature
T5:
Compressor discharge temperature
Ts:Setting temp.
6.3 Main Protection
6.3.1 Three minutes delay at restart for compressor.
6.3.2 Indoor fan delayed open function
----When system starts up, the louver will be active immediately and the indoor fan will open after 10s.
----If the system runs at heating mode, the indoor fan will be also controlled by anti-cold wind function.
6.3.3 Sensor protection at open circuit and breaking disconnection.
6.3.4 Fan speed is out of control.
When Indoor fan speed is too low (lower than 300RPM) lasting 50 seconds, the unit stops and LED
displays failure information and can’t returns to normal operation automatically.
6.3.5 Zero crossing detection error protection
If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not
correct, the unit will stop and the LED will display the failure. The correct zero crossing signal time
interval should be between 6-13ms.
6.4 Operation Modes and Functions
6.4.1 Fan mode
(1) The 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 the 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℃ setting
temperature.
27.5
High
27
25.5
Medium
25
Low
6.4.2 Cooling Mode
6.4.2.1 Compressor running rules:
The compressor will run at corresponding frequency according to the gross amendatory capacity
demand.
Frequency(Hz)
0
COOL_F1
COOL_F2
……
COOL_F11
COOL_F12
Amendatory capacity demand.
0
1
2
……
11
≧12
Meanwhile the maximum running frequency will be adjusted according to the outdoor ambient temp.
43
COOL_F4
42
41
COOL_F5
39
38
COOL_F6
37
No limit
6.4.2.2 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:
3.5
High
3
Medium
1.5
1
Low
6.4.2.3 Evaporator low temperature T2 protection.
When T2<4℃, the indoor has no capacity demand and resume till T2>8℃.
6.4.2.4 Outdoor fan running rules:
H igh
22
20
Low
6.4.3 Heating Mode
6.4.3.1 Compressor running rules:
The compressor will run at corresponding frequency according to the gross amendatory capacity
demand.
Frequency(Hz)
0
HEAT_F1
HEAT _F2
……
HEAT _F11
HEAT _F12
Amendatory capacity demand.
0
1
2
……
11
≧12
6.4.3.2 Indoor fan running rules:
Indoor fan speed can be set as high, medium, low or auto fan and the anti-cold-wind function is
preferential.
T2
44℃
38℃
℃
Setting
37℃
Low
34℃
33℃
Breeze
24℃
17℃
Super Breeze
Off
Auto fan action in heating mode.
Low
2.5
2
Medium
1.5
1
High
6.4.3.3 Outdoor fan running rules:
14
Low
12
High
6.4.3.3 High evaporator coil temp.T2 protection:
If T2>63℃, the indoor unit has no capacity demand and resume till 48℃.
6.4.3.4 Defrosting mode:
Condition of defrosting:
T3≦TCDIN and lasts for 40 minutes. TCDIN=-2℃.
Defrosting action:
HEAT_F2
COOL_F9
Compressor
10S 30S
30S 10S
4-Way valve
Outdoor fan
Indoor fan
10S
Condition of ending defrosting:
If any one of following items is satisfied, defrosting will stop and the machine will turn to normal heating
mode.
① T3 >TCDE; TCDE=15℃.
② The defrosting time achieves 10min.
6.4.4 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 cooling, heating or fan-only mode according to ∆T (∆T =T1-Ts).
∆T=T1-Ts
Running mode
∆T>1℃
Cooling
-1≤∆T≤1℃
Fan-only
∆T<-1℃
Heating
Indoor fan will run at auto fan of the relevant mode.
The louver operate same as in relevant mode.
If the machine switches mode between heating and cooling, the compressor will keep stopping for 15
minutes and then rechoose mode according to T1-Ts.
If the setting temperature is modified, the machine will rechoose running function.
6.4.5 Drying mode
6.4.5.1
Indoor fan speed is fixed at breeze and can’t be changed. The louver angle is the same as
in cooling mode.
6.4.5.2
Overlow room temperature protection
In drying mode, if room temperature is lower than 10℃, the indoor fan will stop and not resume until
room temperature exceeds 12℃.
6.4.5.3
Evaporator anti-freezing protection are active
6.4.6 Forced operation function
6.4.6.1 Enter forced operation function:
Press the touch button continually, the AC will run as below sequence:
Forced auto→Forced cooling→Off
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, the machine will turn into forced cooling mode.
In forced cooling mode, pressing touch button will turn off the machine.
6.4.6.2 In forced operation mode, all general protections and remote control are available.
6.4.6.3 Operation rules:
Forced cooling mode:
The indoor fan runs as breeze. After running for 30 minutes, AC will turn to auto mode with 24℃
setting temperature.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature.
6.4.6.4 When there’s indoor unit running in forced cooling, it is the master forced cooling unit. Other
indoor units will run at forced cooling mode too and they will be the slave forced cooling units. The
slave forced cooling units can not quit forced cooling mode until the master forced cooling unit quit,
and turn to cooling mode at low speed with 24℃ setting temperature.
6.4.6.5 The slave forced cooling units will not be controlled by other signals except timer off signal.
For model MSR1I-07HRDN1-Q& MSR1I-09HRDN1-Q, the slave forced cooling units will not be
controlled by other signals.
6.4.6.6 If AC is running in sleep mode and receives forced operation signal, it will quit the sleep mode.
6.4.7 Timer function
6.4.7.1 Timing range is 24 hours.
6.4.7.2 Timer on.
The machine will turn on automatically when reaching the setting time.
6.4.7.3 Timer off.
The machine will turn off automatically when reaching the setting time.
6.4.7.4 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.
6.4.7.5 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.
6.4.7.6 The timer function 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.
6.4.7.7 The setting time is relative time.
6.4.8 Sleep function mode
6.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off.
6.4.8.2. 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.
When heating, the setting temperature decreases 1℃(be higher than 17℃) every one hour, 2 hours
later the setting temperature stops rising and indoor fan is fixed as low speed.(Anti-cold wind function
has the priority)
6.4.8.3 Timer off and remote controller off signals have the priority compared with sleep function.
6.4.8.4 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.
6.4.9 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.
6.4.11 Mode conflict
The indoor units can not work cooling mode and heating at same time.
Heating mode has a priority.
6.4.11.1 Definition:
Cooling mode
Heating Mode
Fan
Off
Cooling mode
No
Yes
No
No
Heating Mode
Yes
No
Yes
No
Fan
No
Yes
No
No
Off
No
No
No
No
No: No mode conflict;
Yes: Mode conflict
6.4.11.2 Unit action
Suppose Indoor unit A working in cooling mode or fan mode, and indoor unit B is set to heating

mode, then A will change to off and B will work in heating mode.

Suppose Indoor unit A working in heating mode, and indoor unit B is set to cooling mode or fan
mode, then B will change to stand by and A will be no change.
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