Light Commercial DC INVERTER SERIES

MULTI TYPE

Service Manual 2013

LMI-C-1211

CONTENTS

1. General information of Indoor Units .............................................. 1

2. Features ........................................................................................... 2

3. Dimensions ..................................................................................... 6

4. Service Space (unit: mm) .............................................................. 14

5. Wiring Diagram ............................................................................. 16

6. Operation temperature range ....................................................... 20

7. Electronic function ........................................................................ 21

※The specifications, designs, and information in this book are subject to change without notice for product improvement.

1

1. General information of Indoor Units

New Four-way cassette (compact)

A5 Duct

Ceiling & Floor

Console

Model name Dimension (mm) Net/Gross weight (kg)

MTBI-12HWDN1-M 700x635x210 20/25

MTBU-12HRDN1-M 700x635x210 20/25

MTBI-18HWDN1-M 920x635x210 23/29

MTBU-18HRDN1-M 920x635x210 23/29

MFAI-12HRDN1-M 700x600x210 15/20

MFAU-12HRFN1-M 700x600x210 15/20

MFAI-18HRDN1-M 700x600x210 15/20

MCA2I-12HRDN1-M 570x570x260 16/19

MCA2U-12HRFN1-M 570x570x260 16/19

MCA2I-18HRDN1-M 570x570x260 18/21

MCA2U-18HRFN1-M 570x570x260 18/21

MUBI-12HRDN1-M 990x660x203 24/30

MUBU-12HRFN1-M 990x660x203 24/30

MUBI-18HRDN1-M 990x660x203 24/30

MUBU-18HRFN1-M 990x660x203 24/30

2

2. Features 2.1 New Four-way cassette type(compact) ⑴ New panel 360°surrounding air outlet design, affords comfortable feeling

⑵ Compact design The body size is 570×260×570mm, it’s just smaller than the ceiling board, so it’s very easy for

installation and will not damage the decoration. The panel size is 647×50×647mm. The hooks are designed in the four corners of the body, which can save installation space.

⑶ Electric control box built-in design The E-box is simply and safely built inside the indoor unit. It’s convenient for installation and

maintenance. Can check the control part easily, you only need to open the air return grille.

⑷ Fresh air intake function: Fresh air fulfills air quality more healthy and comfortable.

3

⑸ Air passage function

Reserves the space for air outlet from the side of indoor unit; It’s availed to connect air duct from the two sides to the nearby small rooms.

Dimension:Φ75mm

Fresh Air

4

2.2 Ceiling & Floor type

⑴ Two-way installation The rounded design of the ceiling and floor type air conditioner allows either ceiling or floor-level

installation. Ceiling installation saves room space, while floor installation helps prevent the loss of warm air.

⑵ Brief design Brief design that is suitable for any interior will not only give you cooling and heating performance but

also upgrade your lifestyle.

⑶ 3D airflow Vertical air flow and horizontal airflow can be adjusted by remote controller, the cooperation of the two

airflow ways help to spread air comfortably throughout even a large room. With these functions, the whole room can be evenly air-conditioned for both floor-level and ceiling installation.

5

⑷ Optional drainage pipe connection Both right side and left side drainage holes are available to avoid the space limitation for drainage pipe

installation. Make you more convenient during installation.

⑸ Five panels for optional

Standard Panel A Panel B Panel (LED display)

C Panel (LED display) D Panel

⑹ Convenience operating and easy maintenance Remote controller as standard, wired controller for optional. The filter without screw fixed, can be took out easily. ⑺ Easy installation, save working time The pipes can be connected from bottom, back and right side, makes the installation more easily. The wiring works can be finished before installation.

⑻ Outside water pump for optional when ceiling installation

6

2.3 A5 Duct ⑴ Installation accessories: (Optional) Front Board, Canvas Air Passage, Filter, Panel, for easy installation

⑵ Easy Installation: Two air inlet styles (Bottom side or Rear side) Air inlet from rear is standard for all capacity; air inlet from bottom is optional. The size of air inlet frame from rear and bottom is same, it’s very easy to move the cover from bottom to

rear side, or from rear to the bottom, in order to matching the installation condition.

⑶ Fresh air intake function Install one duct from the reserved fresh-air intake to outdoor.

Continually inhale the fresh air to improve the quality of the indoor air, fulfills air quality more healthy and comfortable.

⑷ Easy maintenance Clean the filter (Optional, standard product without filter)

It is easy to draw out the filter from the indoor unit for cleaning, even the filter is installed in rear side or bottom side.

Front Board

Canvas Air Passage Filter Panel

Air intake from rear (Standard) Air intake from bottom (Optional)

7

Replace the motor or centrifugal fan

Remove the ventilated panel firstly. Remove a half of blower housing and take out the motor with centrifugal fan. Directly remove two bolts, and then replace the motor or centrifugal fan easily.

⑸ Reserved remote on-off and central control ports Reserved remote on-off ports and central control ports, can connect the cable of an on-off controller or a

central controller to realize remote on-off control function or group control function.

⑹ Built-in drain pump (Optional): Built-in drain pump can lift the water to 750mm upmost. It’s convenient to install drainage piping under

most space condition.

Motor

Blower Housing

Ventilated Panel

Remote on-off ports Central control ports

8

⑺ Built-in display board The standard indoor unit can be controlled by wired controller. There is a display board with a receiver in the E-box. Move out the display, and fix it in other place, even

in the distance of 10m. The unit will realized remoter control. The wired controller and the display board can display the error code or production code when the chips

detect some failure.

Display

750m

m u

pmos

t Wired Controller (Standard) Remote Controller (Optional)

9

2.4 Console ⑴Modern and elegant appearance The simple and stylish designs can nicely harmonies with your living space.

⑵ Four panels optional

⑶ Two air-outlet ways Cooling mode

Quick Cooling To maintain room temp

Air outlet from top and bottom to make quick cooling ------When the A/C is just switched on, or room

temp. is still high, cold air will be blown out from top and bottom air outlet to cool down the room quickly Air outlet from top to maintain room temp. ----When the room has been cooled down, or the A/C has

been opened over 1 hour, cold air only from the top outlet to keep constant room temp

10

Heating mode Anti-cold air ------When the AC is just turn on, temperature of evaporator is very low, in this case, in

order to prevent cold air direct blowing, only the upper louver is opened in a high position, the lower louver closed.

⑷ Four air inlets

⑸ Low noise DC indoor fan motor, which has five speeds. Low noise and energy saving.

Advanced centrifugal fan technology makes a fast airflow and reduces the indoor noise lower to 28dB.

⑹ Golden fin is optional. ⑺ Active carbon filter is standard.

11

3. Dimensions 3.1 New Four-way cassette type(compact) (12000Btu/h /18000Btu/h) :

545(Hook-location)

545(

Hoo

k-lo

catio

n)

647(Panel)

570(Body)

570(

Bod

y)

647(

Pan

el)

260

3.2 Ceiling & Floor (12000Btu/h /18000Btu/h): a. Wall mounting installation

B

A C

D

E

12

b. Ceiling installation

F

>20mm

G

Dimension Capacity(Btu/h)

A B C D E F G H

12000-18000 990 660 206 505 506 907 200 203

3.3 A5 Duct (12000Btu/h /18000Btu/h)

HG

E FA

B

DC

L

M

13

Capacity (Btu)

Outline dimension(mm) Air outlet opening size Air return opening size Size of outline dimension mounted plug

A B C D E F G H I J K L M

12000 700 210 635 570 65 493 35 119 595 200 80 740 350

18000 920 210 635 570 65 713 35 119 815 200 80 960 350

3.4 Console (12000Btu/h /18000Btu/h)

14

4. Service Space (unit: mm) 4.1 Four-way cassette (compact)

A≧

280

>230

Ground

OutletInlet

Outlet

Ceiling

4.2 Ceiling & Floor

C

≥35m

m

≥35m

m

≥35mm

≥1000mm

4.3 A5 Duct

15

4.4 Console

≥100

mm

≥100

mm

≥100mm

≥1000mm

16

5. Wiring Diagram 5.1 MTBI-12HWDN1-M, MTBI-18HWDN1-M

5.2 MTBU-12HRDN1-M MTBU-18HRDN1-M

17

5.3 MFAI-12HRDN1-M、MFAI-18HRDN1-M

5.4 MFAU-12HRFN1-M

18

5.5 MCA2I-12HRDN1-M、MCA2I-18HRDN1-M

5.6 MCA2U-12HRFN1-M MCA2U-18HRFN1-M

19

5.7 MUBI-12HRDN1-M、MUBI-18HRDN1-M

5.8 MUBU-12HRFN1-M MUBU-18HRFN1-M

20

6. Operation temperature range

Temperature Mode Cooling operation Heating operation Drying operation

Room temperature ≥62℉ ≤88℉ ≥62℉

Outdoor temperature

32℉～122℉

5℉～76℉ 32℉～122℉ （5℉～122℉：For the models with low temperature cooling

system）

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.

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7. Electronic function 7.1 Abbreviation T1: Indoor room temperature

T2: Indoor evaporator temperature

TS: Setting temperature through the remote controller

7.2 Icon explanation on indoor display board 7.2.1 Four-way cassette (compact)

7.2.2 Ceiling & floor

7.2.3 A5 Duct

OPERATION TIMER DEF./FAN ALARM

Temporary button

Operation lamp

Timer indicator

Infrared signal receiver

Alarm indicator

PRE-DEF indicator(cooling and heating type)or fan only indicator(cooling only type)

MANUAL

Display digital tube

7.2.4 Console

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7.3 Main Protection 7.3.1 Sensor protection at open circuit and breaking disconnection.

7.3.2 The malfunction of correspondence in CMOS chip with EEPROM indication.

---- When the CMOS chip and EEPROM can’t communicate during the time of using EEPROM to select

parameter, the LED shows information of the malfunction (when use jump to select parameter, it doesn’t

have this function). After the showing, the unit can’t go right to work except turning off.

7.3.3 Indoor fan delayed open function

----When system starts up, the louver will be active immediately, and for cassette & ceiling&floor, the indoor

fan will open when the top louver opens 50°。For console, the indoor fan will open when the top louver

opens 15°.

----If the system runs in heating mode, the anti-cold wind function has priority.

7.3.5 Fan speed is out of control.（Only for console）

When Indoor fan speed is too low (lower than 300RPM) lasting 60 seconds, the unit stops and LED displays

failure information and can’t returns to normal operation automatically.

7.4 Operation Modes and Functions 7.4.1 Fan-only mode (1) Outdoor fan and compressor stop.

(2) Indoor fan can be set to high/med/low/auto.

(3) The louver operates same as in cooling mode.

(4) Auto fan in fan-only mode acts as follow:

For console：

When T1-24≤3 , transfer high to medium speed,℃

When T1-24≤1 , transfer medium speed to low.℃

When T1-24 >1.5 , transfer low to medium speed,℃

When T1-24 >3.5 , transfer medium ℃ speed to high.

T1-24℃ 3.5 High 3.0 1.5 Medium

1.0 Low

23

For the other types：

When T1-24≤3 , transfer high to medium speed,℃

When T1-24≤1 , transfer medium speed to low.℃

When T1-24 >1 , transfer low to medium speed,℃

When T1-24 >4 , transfer medium speed to high.℃

(5) Sleep mode is invalid.

7.4.2 Cooling mode (1) Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto by using a remote controller:

(2) Auto fan in cooling mode acts as follow:

For Console： For the other types： (3) Anti-freezing control to indoor evaporator in cooling mode

Evaporator Temp. Compressor

Console T2≤ 4℃ Off(After 3 minutes)

T2> 8℃ On

The other types

T2≤ 3℃ Off(After 3 minutes)

T2> 7℃ On

(4) Sleep mode can be set by remote controller..

7.4.3 Dehumidifying mode (1) Indoor fan speed is fixed in low speed and can’t be changed.

T1-24℃ 4.0 High 3.0 Medium

1.0 Low

4

3

1

High

Medium

Low

℃

T1-TS

3.5 3.0

1.0

High

Medium

Low

℃

T1-TS 1.5

24

(2) In dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the same as that of cooling mode. (3) Evaporator anti-freezing protection is active.

(4) Sleep mode is invalid.

7.4.4 Heating mode (1) Indoor fan actions in 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 in heating mode: For console：

E1=28℃ TE2=32℃ TE3=30℃ TE4=15℃ TE5=20℃ For the other types:

TE1=28℃ TE2=32℃ TE3=30℃ TE4=15℃ (2) Auto wind in heating mode For Console: For the other types

T2 TE2 TE3 Setting fan speed TE1 TE5 TE4

Fan off

T2 TE2 Setting fan speed TE3 TE1 Low TE4 Fan off

T1-TS ℃ +2.5 Low fan +2.0 Med. fan +1.5 +1.0 High fan

Breeze Low

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(3) High evaporator coil temp.T2 protection:

Condition Compressor

T2<TE9 On

TE9<T2< TE7 Decrease frequency of compressor

T2>= TE7 Off

For console：TE7=60℃；TE9=48℃ For the other types: TE7=63℃；TE9=54℃

7.4.5 Prevent Over-Heating For console: In heating mode, when the indoor unit has no capacity requirement due to indoor room temperature increased, the Indoor fan will run in breeze. (Anti-cold wind function has the priority) For ceiling& floor: In heating mode, when the indoor unit has no capacity requirement due to indoor room temperature increased, the Indoor fan will run in low. (Anti-cold wind function has the priority) For new four-way cassette (compact)&A5 duct: In heating mode, when the indoor unit has no capacity

requirement due to indoor room temperature increased, if outdoor fan and compressor stop, the Indoor fan

will run in setting fan speed, otherwise, the Indoor fan will run in low. (Anti-cold wind function has the priority)

7.4.6 Defrosting Defrosting operation (Available for heating only). Defrosting Actions:

a. Indoor fan switches off, anti-cold wind function is valid. b. After defrosting ends, indoor fan runs according to anti-cold wind function in heating mode.

7.4.7 Auto-mode This mode can be chosen by 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 the difference between T1 and TS.

T1-TS Running mode

T1-TS＞1℃ Cooling

-1< T1-TS≤1℃ Fan-only

T1-TS≤-1℃ Heating

Indoor fan will run in auto fan of the relevant mode.

The louver operates the same as in relevant mode.

T1-TS

3C Med. fan Low fan 2C

1C High fan

26

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.

7.4.8 Forced operation function

7.4.8.1 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.

7.4.8.2 In forced operation mode, all general protections and remote control are available.

7.4.8.3 Operation rules:

Forced auto mode:

The action of forced auto mode is the same as normal auto mode with 24 setting t℃ emperature.

Forced cooling mode:

The indoor fan runs as low(for console, the indoor fan runs as breeze). After running for 30 minutes, AC will

turn to auto mode with 24 setting temperature.℃

7.4.8.4 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 previous

operating mode.

7.4.8.5 The slave forced cooling units will not be controlled by other signals.

7.4.9 Timer Function (1) Timing range is 24 hours, and the minimum resolution is 30 minutes.

(2) Timer on. After turning off, the machine will turn on automatically when reaching the setting time.

(3) Timer off. After turning on, the machine will turn off automatically when reaching the setting time.

(4) Timer on/off. After turning off, the machine will turn on automatically when reaching the setting “on”

time, and then turn off automatically when reaching the setting “off” time.

(5) Timer off/on. After turning 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) The setting time is relative time.

(7) The tolerance of timer is 1 minute per hour.

27

(8) 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.

7.4.10 Sleep mode (1) Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off.

(2) It is available at cooling, heating or auto mode.

(3) Operation process in sleep mode is as follow:

After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.

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 decreasing and indoor fan is fixed as low speed.(Anti-cold wind function has the

priority)

When Auto, the sleep mode running function operates in accordance with selected running mode by auto mode. (4)When user uses timer off function in sleep mode(or sleep function in timer off mode), if the timing time is

less than sleep time, sleep function will be cancelled when reaching the timing time. If the timing time is

more than sleep time, the machine will stop until reaches the sleep time.(Only for console)

(5)When sleep function is cancelled, the indoor unit will not stop except console. 7.4.11 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 turn off.

7.4.12 Mode conflict The indoor units can not work cooling mode and heating at same time. Heating mode has a priority. (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 (2) Unit action In case of one Indoor unit working in cooling mode or fan mode, and another indoor unit is set to heating

28

mode, the indoor unit working in cooling mode or fan mode will change to off. The outdoor unit will change to heating mode after compressor stop 3 minutes. .

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. The outdoor unit will continue working in heating mode. If heating mode stops (not including the indoor unit in heating mode reaching the set temperature), 3 minutes after the outdoor unit restarts and works in cooling mode or fan-only mode. Appendix:

℃ 10 11 12 13 14 15 16 17 18 19 20 21 22

℉ 48 50 52 54 56 58 60 62 64 66 68 70 72

℃ 23 24 25 26 27 28 29 30 31 32 33 34 35

℉ 74 76 78 80 82 84 86 88 90 92 94 96 98