Midea MSV1I-09HRDN1 Operating manual

1
GD Midea Refrigeration Equipment Co.,Ltd
MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS
Technical service manual 2006
R410AVertu Inverter multi Series
Indoor Models
MSV1I-09HRDN1
MSV1I-12HRDN1
Outdoor Models
M2OA-18HRIN1
M3OA-27HRIN1
M40A-27HRIN1
Downloaded from AC-Manual.com Manuals

2
1. Product features
2. Dimensions
3. Refrigeration cycle diagram
4. Operation temperature limits
5. Indoor units combination
6. Wiring diagram
7. Wiring connection
8. Electric control functions
9. Troubleshooting
Annex 1 Characteristic of temp. sensor
Annex 2 Reference data
Downloaded from AC-Manual.com Manuals

3
1 Product Features
1.1 Powerful at cooling/heating.
1.2 Low voltage start-up function.
1.3 Anti-icing function at cooling mode.
1.4 Anti-cold air function at heating mode.
1.5 Auto-defrosting.
1.6 Outdoor electric current protection
1.7 Temperature protection of the outdoor compressor top.
1.8 Error self diagnosis function.
1.9 Free connection between indoor and outdoor unit
Downloaded from AC-Manual.com Manuals

2 Dimensions
2.1 Indoor unit
2.2 Outdoor unit
a) Outdoor unit M2OA-18HRIN1& M3OA-27HRIN1
Dimension
Mode W H D
9K 795 270 165
12K 845 286 165
Downloaded from AC-Manual.com Manuals

5
335
845
b) Outdoor unit M4OA-27HRIN1
Downloaded from AC-Manual.com Manuals

6
3 Refrigeration Cycle Diagram
3.1 Refrigeration circuit drawing of inverter quadplex type
Outdoor Unit
Indoor pipe out
temp. seneor C
Indoor pipe out
temp. seneor A
Indoor pipe out
temp. seneor B
Exhaust
temp. sensor
Check
Valve
Auxiliary
Capillary Main
Capillary
Filter C
Filter B
Filter A
Capillary C
Capillary B
Capillary A
Indoor Unit
Cross
flow fan
Evaporator
Liquid valve B
Liquid valve C
Gas valve B
Gas valve A
EXV A
EXV B
Axial flow fan
Condenser
Compressor
4-way
valve
EXV C
Gas valve C
Liquid valve A
Gas valve D
EXV C
Capillary C
Filter C
Liquid valve D
Indoor pipe out
temp. seneor D
Coil temp.
sensor
3.2 Refrigeration circuit drawing of inverter trinary type
Liquid valve A
Gas valve C
EXV C
4-way
valve
Compressor
Condenser
Axial
flow fan
EXV B
EXV A
Gas valve A
Gas valve B
Liquid valve C
Liquid valve B
Evaporator
Cross
flow fan
Indoor Unit
Capillary A
Capillary B
Capillary C
Filter A
Filter B
Filter C
Main
Capillary
Auxiliary
Capillary
Check
Valve
Exhaust
temp. sensor
Indoor pipe out
temp. seneor B
Indoor pipe out
temp. seneor A
Indoor pipe out
temp. seneor C
Outdoor Unit
Coil temp.
sensor
Downloaded from AC-Manual.com Manuals

7
3.2 Refrigeration circuit drawing of inverter binary type
Indoor Unit
Cross
flow fan
Evaporator
Liquid valve A
Liquid valve B
Gas valve B
Gas valve A
EXVA
EXVB
Axial flow fan
Condenser
Compressor
4-way
valve
Auxiliary
Capillary
Capillary A
Capillary B
Exhaust
temp. sensor
Indoor pipe out
temp. seneor A
Indoor pipe out
temp. seneor B
Filter A
Filter B
Outdoor Unit
Main
Capillary
Check
Valve
Coil temp.
sensor
4 Operation Temperature Limits
Indoor temperature 17℃～32℃
Cooling mode Outdoor temperature 0℃～50℃
Indoor temperature <=30
Heating mode Outdoor temperature -15℃～33℃
Indoor temperature 10℃～32℃
Dry mode Outdoor temperature 0℃～50℃
Downloaded from AC-Manual.com Manuals

8
5 Indoor units combination
5.1 M2OA-18HRIN1
Indoor units can be combined by
7000Btu/h
9000 Btu/h
12000Btu/h
7000Btu/h+9000 Btu/h
7000Btu/h+12000Btu/h
9000Btu/h+9000 Btu/h
9000Btu/h+12000Btu/h
12000Btu/h+12000Btu/h
12000Btu/h+18000Btu/h
9000Btu/h+18000Btu/h
7000Btu/h+18000Btu/h
5.2 M3OA-27HRIN1
Indoor units can be combined by
7000Btu/h
9000 Btu/h
12000Btu/h
7000Btu/h+9000 Btu/h
7000Btu/h+12000Btu/h
9000Btu/h+9000 Btu/h
9000Btu/h+12000Btu/h
12000Btu/h+12000Btu/h
12000Btu/h+18000Btu/h
9000Btu/h+18000Btu/h
7000Btu/h+18000Btu/h
7000Btu/h*2+9000 Btu/h
7000Btu/h*2+12000 Btu/h
7000Btu/h*2+18000 Btu/h
7000Btu/h*3
9000Btu/h*2+7000 Btu/h
9000Btu/h*2+12000 Btu/h
9000Btu/h*3
12000Btu/h*2+7000 Btu/h
12000Btu/h*2+9000 Btu/h
12000Btu/h+7000Btu/h+9000Btu/h
5.3 M4OA-27HRIN1
Indoor units can be combined by
7000Btu/h
9000 Btu/h
12000Btu/h
Downloaded from AC-Manual.com Manuals

9
7000Btu/h+9000 Btu/h
7000Btu/h+12000Btu/h
9000Btu/h+9000 Btu/h
9000Btu/h+12000Btu/h
12000Btu/h+12000Btu/h
12000Btu/h+18000Btu/h
9000Btu/h+18000Btu/h
7000Btu/h+18000Btu/h
7000Btu/h*2+9000 Btu/h
7000Btu/h*2+12000 Btu/h
7000Btu/h*2+18000 Btu/h
7000Btu/h*3
9000Btu/h*2+7000 Btu/h
9000Btu/h*2+12000 Btu/h
9000Btu/h*2+18000 Btu/h
9000Btu/h*3
12000Btu/h*2+7000 Btu/h
12000Btu/h*2+9000 Btu/h
12000Btu/h*3
7000Btu/h+9000Btu/h+12000Btu/h
7000Btu/h+9000Btu/h+18000Btu/h
9000Btu/h+9000Btu/h+18000Btu/h
7000Btu/h+12000Btu/h+18000Btu/h
9000Btu/h+12000Btu/h+18000Btu/h
7000Btu/h*2+9000 Btu/h*2
7000Btu/h*2+9000 Btu/h+12000 Btu/h
7000Btu/h*3+9000 Btu/h
7000Btu/h*3+12000 Btu/h
7000Btu/h*3+18000 Btu/h
7000Btu/h*4
9000Btu/h*2+7000 Btu/h+12000 Btu/h
9000Btu/h*3+7000 Btu/h
9000Btu/h*3+12000 Btu/h
97000Btu/h*4
Remark:
1. One, two, three or four indoor units can be connected according your need;
2. As 18000 Btu/h unit, just Cassette and duct are available.
3. There should be no more two duct indoor units and other indoor units should be all wall
mounted in a system;
4. There should be no more one cassette and other indoor units should be all wall
mounted in a system;
5. Cassette and duct can not be combined in a system;
6. When heating, capacity attenuate sharply if indoor unit capacity exceed too much.
Downloaded from AC-Manual.com Manuals

10
6. Wiring Diagram
6.1 Indoor unit
6.2 Outdoor unit M2OA-18HRIN1
Downloaded from AC-Manual.com Manuals

11
6.3 Outdoor unit M3OA-27HRIN1
Downloaded from AC-Manual.com Manuals

12
6.4 Outdoor unit M4OA-27HRIN1
Downloaded from AC-Manual.com Manuals

13
7 Wire connection
7.1 Connection wire specification
Standard
length(mm) Cores Thickness(mm2) Wire cover specification
Connection wire
between indoor
unit and outdoor
unit
6000 4
(L,N,S,Grounding) 1.0 Neoprene YZW300/500V
Remark: The connection wire between indoor unit and outdoor unit is standard. And it is
packaged in the indoor unit.
7.2 Connection wire drawing
20±10
2 Neoprene YZW300/500V
C5A 21*9*37
magnetism cycle
Tight cincture
120
Heat retractile pipe
Plug
Grouding
terminal
1.0mm2
L
N
S
Grounding
1.0mm2
Wire connection
terminal
Downloaded from AC-Manual.com Manuals

14
8 Electronic control function
8.1 Protection
1. 3 minutes delay at restart for compressor.
2. Temperature protection of compressor top, compressor stops when the temp. of top of
compressor is more than 120℃, compressor runs when the temp. of top of compressor is
less than 105℃.
3. When AC voltage ≥270V for 30 seconds, Outdoor Unit stops operation and alarms.
When AC voltage ≤260V for 30 seconds, outdoor unit resumes operation.
4. Inverter module protection, Inverter module Protection itself has a protection function
against current, voltage and temperature.
5. Sensor protection at open circuit and breaking disconnection.
6. Fan Speed is out of control. When Indoor Fan Speed is too high (higher than High
Fan+300RPM) or too low (lower than 400RPM), the unit stops and LED displays failure
information and can’t return to normal operation automatically.
7. Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit
stops and LED displays failure information and can’t return to normal operation
automatically.
8. Current protection: When the current is more than 25A, the compressor stops.
9. Outdoor condenser high temperature protection: Under cooling mode, if T3>65℃for 3
minutes, the compressor will stop. When T3<52℃, the protection is not valid.
10. Outdoor low temperature protection: If the outdoor temperature is lower than -15℃
for 1hour, the compressor and fan motor will stop. If the outdoor temperature is higher than
-12℃for 10 minutes and the compressor stops operation for 1h, or the outdoor
temperature is higher than 5℃for 10 minutes, then restart and enter into the prior
operation mode.
11. Compressor pre-heating function: When the outdoor temperature is lower than 3℃
and the compressor stops operation for more than 3 hours, or the outdoor temperature is
lower than 3℃and the power is just put on, the compressor enters into pre-heating
condition. When outdoor temp. is more than 5℃or user operate it, pre-heating condition
will finish.
8.2 Operating mode
8.2.1 Cooling mode
1.Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto:
2.Auto fan at cooling mode: (T=Indoor Temp.-Setting Temp.)
Condition Indoor fan speed
T<1.5℃Low
1.5℃<T<4℃Mid.
Room temp. up
T>4℃High
T> 3℃High
1℃<T<3℃Mid.
Room temp. down
T<1℃Low
3.Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
Downloaded from AC-Manual.com Manuals

15
Evaporator Temp. Compressor
T< 4℃Off
T > 8℃On
8.2.2 Dehumidifying mode
1.The indoor fan is fixed in low speed
2. Low room temperature protection:
When room temperature decreases to below 10 ℃, indoor fan stop, when room
temperature restores to over 12℃, indoor fan start.
3. At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the
same as that of cooling mode.
8.2.3 Heating mode
1. Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind function
prevails.
Anti-cold wind control function at heating mode
Condition
T= Indoor exchanger
temp.
Indoor fan speed
T<34℃Off
34℃<T<37℃Breeze
37℃<T<44℃Low speed
Indoor exchanger temp.
up
T> 44℃Setting fan speed
T> 38℃Setting fan speed
33℃<T<38℃Low speed
24℃<T<33℃Breeze
Indoor exchanger temp.
down
T<24℃Off
Auto wind at heating mode
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<1.5℃High
1.5℃<T<2.5℃Mid.
Room temp. up
T>2.5℃Low
T<1.0℃High
1.0℃<T<2.0℃Mid.
Room temp. down
T>2.0℃Low
Downloaded from AC-Manual.com Manuals

16
Indoor evaporator high-temperature protection at heating mode
Condition
T= Indoor exchanger temp.
Compressor
T<48℃On
53℃<T<63℃Decrease frequency of compressor
T>63℃Off
8.2.4 Defrost operation
1. Defrosting condition:
The temperature of outdoor heat exchanger remains consecutively lower than -2°c for more
than 40 minutes,
2. Ending condition of defrosting
If one of following conditions is satisfied, end the defrosting and turn into heating mode:
a. The defrost time has reached to 10 minutes.
b. When the temperature of outdoor heat exchanger rises up to 15°C.
3. Defrosting Actions:
a. Compressor runs.
b. 4 way valve switches off,
c. Outdoor fan switches off
d. Indoor fan running according to anti-cold wind function in heating mode.
4. Automatic operation mode
The air conditioner automatically selects one of the following operation modes: cooling,
heating or fan only according to the temp. difference between room temp. (TA) and set
temp. (TS).
TA—TS Operation mode
TA—TS>2℃Cooling
-1℃≤TA-TS≤+2℃Fan-only
TA-TS<-1℃Heating (air-only for cooling only type)
8.3 Mode conflict
The indoor units can not work cooling mode and heating at same time.
Heating mode has a priority.
8.3.1Definition
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
8.3.2 Unit action
•In case of one Indoor unit working in cooling mode or fan mode, and another indoor
unit is set to heating mode, the indoor unit working in cooling mode or fan mode will
Downloaded from AC-Manual.com Manuals

17
change to stand by. The outdoor unit will work in heating mode.
•In case of one Indoor unit working in heating mode, and another indoor unit is set to
cooling mode or fan mode, the indoor unit setting to cooling mode or fan mode will
change to stand by.
8.4 Manual switch
Mode changes when push this button.
Cooing modeÆAuto modeÆUnit offÆCooing mode
At Cooing mode, after 30 minutes cooling operation whose fan speed is set as low, the
A/C operates with a setting temp. of 24℃.
At auto mode, the A/C operates with a set temp. of 24℃
8.5 Timer Function
1. The maximum length of timer is 24 hours and the minimum resolving power is 15
minutes.
2. Timer on: first turn off the A/C, the A/C will be automatically on at the set time.
3. Timer off: first turn on the A/C, the A/C will be automatically off at the set time
4. Timer on/off function( on time is earlier than off time): first turn off the A/C, it will be
automatically on at set time, and later be off at the set time, then unit turns on at set time.
5. Timer off/on function( off time is earlier than on time): first turn on the A/C, it will be
automatically off at set time, and later be on at the set time, then unit turns off at set time.
8.6 Sleep mode
8.6.1It is available at cooling, heating or auto mode.
8.6.2Cooling:
The set temperature rise 1℃per hour. Two hours later, the set temperature will maintain as
a constant and the fan speed is kept at low speed.
8.6.3Heating:
The set temperature decrease 1℃per hour. Two hours later, the set temperature will
maintain as a constant and the air circulation is kept at low speed (Cold air proof function
takes precedence over all).
8.6.4 Auto:
The Sleep Mode running function operates in accordance with selected running mode by
auto mode.
8.6.5After 7 hours, unit cancels this mode automatically.
J2 On On Off Off
J3 On Off On Off
Stop time 7 hours 8 hours 6 hours 7 hours
Downloaded from AC-Manual.com Manuals

18
8.7 Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous
settings before the power failure when power returns.
8.8 Capacity test frequency locked.
When test the cooling capacity, the frequency can be locked at Rated Frequency by
following the below:
1. Set the indoor temp. to 17℃and high speed;
2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated
Frequency.
After the test is over, turn off the indoor to exit.
When test the heating capacity, the frequency can be locked at 85Hz by following the
below:
1. Set the indoor temp. to 30℃and high speed;
2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated
Frequency.
After the test is over, turn off the indoor to exit.
8.9 Indoor unit indicator displayer
8.9.1 OPERATION indicator
This indicator flashes after power is on and illuminates when the unit is in operation.
8.9.2 AUTO indicator
This indicator illuminates when the air conditioner is in AUTO operation.
8.9.3 TIMER indicator
This indicator illuminates when TIMER is set ON/OFF.
8.9.4 CLEAN AIR indication lamp
Lights up when CLEAN AIR feature is activated and Ionizer can generate abundant anions
to fill the room with refreshing and natural air.
8.9.5 PRE.-DEF. Indicator (For Cooling & Heating models only)
This indicator illuminates when the air conditioner starts defrosting automatically or when
the warm air control feature is activated in heating mode.
8.9.6 TURBO indication lamp
Lights up when select TURBO function on cooling operation or on heating operation.
8.9.7 FREQUENCYindicator
This indicator appears only when the compressor is in operation and indicates the current
operating frequency.
8.9.8 TEMPERATURE indicator
Usually it displays the temperature settings. When change the setting temperature, this
indicator begins to flash, and stops 20 seconds later.
It displays the room temperature when the air conditioner is in FAN only operation.
When the unit stops operation, it returns to original factory settings.
Downloaded from AC-Manual.com Manuals

19
Displays the malfunction code or protection code.
8.9.9 FAN SPEED indication lamp
Displays the selected fan speed: AUTO(nothing) and three fan speed levels: LOW, MED
and HIGH.
8.10 Outdoor unit LED display function:
1. When stand-by it display number of indoor unit online;
2. When operation it display frequency of outdoor unit;
3. When defrost it display “df”;
4. When a protection or error occurred, it displays error code or protection code.
8.11 Check function:
There is a check button on outdoor pcb. When push this button, the outdoor LED can
display in sequence:
Capacity demand→Running mode →revised capacity →fan state →No.1 evaporator pipe
temp. →No.2 evaporator pipe temp.→No.3 evaporator pipe temp.→No.4 evaporator pipe
temp.→outdoor pipe temp. →Outdoor temp. →discharge gas temp.→current of outdoor
unit →No. 1 opening degree of electronic expansion valve →No. 2 opening degree of
EXV →No. 3 opening degree of EXV→No. 4 opening degree of EXV→indoor unit
number→last protection/error code→capacity demand(cycle)
Explanation for the some display content:
1. Running mode:
Display Corresponding mode
0 Off
1 Cooling mode
2 Heating mode
2. Fan state:
Display Corresponding mode
0 Off
1 Low fan
2 High fan
3. Opening degree of EXV:
Opening degree equals the display data times 8;
4. Number of indoor unit
The indoor unit that can communicate with outdoor unit normally.
Downloaded from AC-Manual.com Manuals

20
8.12 Outdoor fan speed control
There is one fan with two-speed, the fan speed is controlled according ambient temp. After
the compressor stop, 30 seconds later the fan stops.
When cooling:
> 27 High speed
Ambient temp.rise <27 Low speed
>25 High speedAmbient
temp.decline <25 Low speed
When heating:
> 14 Low speed
Ambient temp.rise <14 High speed
>12 Low speedAmbient
temp.decline <12 High speed
8.13 Oil return function
If operation frequency is lower than 54Hz in 2 hours consecutively, it will be increased to
62Hz for 3 minutes. Then it recovers to the former operation frequency.
Downloaded from AC-Manual.com Manuals