Midea Mono 3D Service Manual

Revision A: 1312030001, Content updated.

Model Numbers:

MS11M-09HRFN1-MW0W MS11M-12HRFN1-MV0W MS11M-18HRFN1-MU0W
MS11M-24HRDN1-MT0W

Oasis MONO Split 3D DC Inverter

Air Conditioner

SERVICE MANUAL

Mono 3D

Table of Contents

1. Precaution

2. Part Names And Functions

3. Dimension

4. Refrigerant Cycle Diagram

5. Wiring Diagram

6. Installation Details

7. Operation Characteristics

8. Electronic Function

9. Troubleshooting

10. Exploded View

11. Disassembly Instructions

WARNING

 Installation MUST conform with local building codes or, in the absence of local codes, with the

National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.

 The information contained in the manual is intended for use by a qualified service technician

familiar with safety procedures and equipped with the proper tools and test instruments

 Installation or repairs made by unqualified persons can result in hazards to you and others.
 Failure to carefully read and follow all instructions in this manual can result in equipment

malfunction, property damage, personal injury and/or death.

 This service is only for service engineer to use.

CONTENTS

1. Precaution ..................................................................................................................................................... 1

1.1 Safety Precaution .......................................................................................................................... 1

1.2 Warning ......................................................................................................................................... 1

2. Part Names And Functions .......................................................................................................................... 4

2.1 Model Names of Indoor/Outdoor units .......................................................................................... 4

2.2 Part names of Indoor/Outdoor units ............................................................................................. 4

2.3 Functions of Indoor/Outdoor units ................................................................................................ 5

3. Dimension ..................................................................................................................................................... 8

3.1 Indoor Unit ..................................................................................................................................... 8

3.2 Outdoor Unit ................................................................................................................................ 10

4. Refrigerant Cycle Diagram ........................................................................................................................ 11

5. Wiring Diagram ...........................................................................................................................................12

5.1 Indoor Unit ................................................................................................................................... 12

5.2 Outdoor Unit ................................................................................................................................ 14

6 Installation Details .......................................................................................................................................19

6.1 Wrench torque sheet for installation ........................................................................................... 19

6.2 Connecting the cables ................................................................................................................ 19

6.3 Pipe length and the elevation ..................................................................................................... 19

6.4 Installation for the first time ......................................................................................................... 20

6.5 Adding the refrigerant after running the system for many years ................................................ 21

6.6 Re-installation while the indoor unit need to be repaired ........................................................... 21

6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 22

7. Operation Characteristics ..........................................................................................................................24

8. Electronic Function ....................................................................................................................................25

8.1 Abbreviation ................................................................................................................................ 25

8.2 Display function ........................................................................................................................... 25

8.3 Main Protection ........................................................................................................................... 26

8.4 Operation Modes and Functions................................................................................................. 28

9. Troubleshooting..........................................................................................................................................36

9.1 Indoor Unit Error Display ............................................................................................................ 37

9.2 Outdoor unit error display ........................................................................................................... 38

9.3 Diagnosis and Solution ............................................................................................................... 41

10. Exploded View ..........................................................................................................................................65

10.1 Indoor unit ................................................................................................................................. 65

10.2 Outdoor unit .............................................................................................................................. 73

11 Disassembly Instructions .........................................................................................................................81

11.1 Indoor unit ................................................................................................................................. 81

11.2 Outdoor unit ............................................................................................................................... 85

1

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
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.

 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.

2

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 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.

 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.

A dirty 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.

3

 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.

4

2. Part Names And Functions

2.1 Model Names of Indoor/Outdoor units

Series

Capacity

Indoor units

Outdoor units

Inverter

9k

MS11M-09HRFN1-MW0W

MOC-09HFN1-MW0W

12k

MS11M-12HRFN1-MV0W

MOC-12HFN1-MV0W

18k

MS11M-18HRFN1-MU0W

MOF-18HFN1-MU0W

24k

MS11M-24HRDN1-MT0W

MOG-24HFN1-MT0W

2.2 Part names of Indoor/Outdoor units

5

2.3 Functions of Indoor/Outdoor units

Cold catalyst filter

Plasma(O)

Silver Ico Filter(O)

Vitamin C Filter(O)

3M HAM Filter(O)

Bio Filter(O)

Golden Fin(O)

Ionizer(O)

Compressor Crankcase Heater

Self Clean(O)

1W Standby

Louver Position Memory Function

Refrigerant Leakage Detect

Self-diag. Function

Hydrophilic Aluminum Fin

Anti-rust Cabinet

Valve Protection Cover

PTC Heating Belt(O)

Horizontal &Vertical Swing Function(O)

Filter

Follow Me(O)

Silent mode(O)

O: optional function

6

 Cold Catalyst Filter:
Eliminate formaldehyde and other volatile organic compounds as well as harmful gases and odors.
 Ionizer:
Release negative ions, eliminate odor, dust, smoke and pollen particles to give you fresh and healthy air.
 Plasma:
Generate a high voltage electrostatic zone, absorb and eliminate dust, smoke and pollen particles. It also
deodorizes air as removing tobacco odours, garbage smells etc.
 Silver Ion Filter:
Sterilize bacteria effectively by decomposing cell wall of bacteria.
 Vitamin C Filter:
Release Vitamin C which can eliminate active oxygen to beautify the skin.
 3M HAM Filter:
Open-hole-structure with charged electrostatic effectively capture dust and particles, ensure maximum air
flow and minimum pressure drop.
 Bio Filter(O):
Bio filter consists of a specialized biological enzyme and Eco filter. The Eco filter catches very small
airborne dust particles and bacteria, fungi and microbes. Biological enzyme kills bacteria by dissolving their
cell wall thus eliminating the problem of re-pollution.
 Golden Fin:
The Golden hydrophilic condenser can improve the heating efficiency by accelerating the defrosting
process. The unique anticorrosive golden coating on the condenser can withstand the salty air, rain and
other corrosive elements.
 Self Clean:
When this function is activated, firstly the indoor unit operates as Fan-only mode with low fan speed, during
this period the condensed water will take some dust on evaporator fins away. After that the unit turns to
heating operation with low fan speed which dries the inside of indoor unit. Finally it turns to fan-only mode
and blows away the wet air. The whole process cleans the internal side of indoor unit and prevents the
breeding of bacteria.
 Follow me:
With this technology, a temperature sensor is built in the remote control when you stay close to the remote
control, the unit will automatically change the operation mode to supply comfortable temperature just like
the air conditioner is following you.
 Silent mode
Indoor fan will run at super breeze speed and indoor unit noise level can be extremly low to 20dB(A) when
the unit enters silent mode operation.
 Horizontal&Vertical Swing Function
The unit has auto horizontal swing and auto vertical swing function, which supplies more even and
comfortable air flow.
 Louver position memory function:
When starting the unit again after shutting down, its louver will restore to the angle originally set by the user
 Refrigerant leakage detect:
The refrigerant leakage detect function can better prevent the compressor being damaged by refrigerant
leakage or compressor overload.
 Self-diag.Function:
Monitoring some abnormal operations or parts failures, microcomputer of the air conditioner will switch off
and protect the system automatically.Meanwhile, the error or protection code will be displayed on the indoor

7

unit.
 PTC heating belt:
With a PTC heating belt fitted on the base plate of the outdoor unit, the rain, snow or defrosted water
accumulating on the base plate is avoided.
 Compressor crankcase heater:
The oil dissolves easily in refrigerant, especially in low temperature condition. The crankcase heating belt
can heat the bottom of the compressor to avoid pumping out too much oil with the refrigerant, which helps
to protect the compressor.

8

3. Dimension

3.1 Indoor Unit

W D

Model

L R H

Dimension of installation hole

MS11M-09HRFN1-MW0W

140mm

(5.5in)

110mm

(4.3in)

45mm
(1.8in)

Φ65mm(2.56in)

MS11M-12HRFN1-MV0W

Model

W D H

MS11M-09HRFN1-MW0W

835mm
(32.9in)

198mm

(7.8in)

280mm
(11.0in)

MS11M-12HRFN1-MV0W

MS11M-18HRFN1-MU0W

990mm
(39.0in)

218mm

(8.6in)

315mm
(12.4in)

MS11M-24HRDN1-MT0W

1186mm

(46.7in)

258mm
(10.2in)

340mm
(13.4in)

9

Model

L R H

Dimension of installation hole

MS11M-18HRFN1-MU0W

260mm
(10.2in)

135mm

(5.3in)

45mm
(1.8in)

Φ65mm(2.56in)

Model

L R H

Dimension of installation hole

MS11M-24HRDN1-MT0W

275mm
(10.8in)

275mm
(10.8in)

45mm
(1.8in)

Φ65mm(2.56in)

10

3.2 Outdoor Unit

More than 60cm(23.6in)

More than 70cm(27.6in)

More than 30cm(11.8in)

More than 60cm(23.6in)
(Service space)

Fence or

obstacles

More than 30cm(11.8in)

Note: The above drawing is only for reference. The appearance of your units may be different.

Model

W D H

W1 A B

MOC-09HFN1-MW0W

760mm
(29.9in)

285mm
(11.2in)

590mm

(23.2in)

823mm
(32.4in)

530mm
(20.9in)

290mm
(11.4in)

MOC-12HFN1-MV0W

MOF-18HFN1-MU0W

845mm
(33.3in)

320mm
(12.6in)

700mm
(27.6in)

908mm
(35.7in)

560mm
(22.0in)

335mm
(13.2in)

MOG-24HFN1-MT0W

900mm
(36.7in)

315mm
(12.9in)

860mm
(35.1in)

980mm

(40in)

590mm
(24.1in)

333mm

(13.6in)

11

4. Refrigerant Cycle Diagram

LIQUID SIDE

GAS SIDE

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

Compressor

2-WAY VALVE

3-WAY VALVE

4-WAY VALVE

COOLING
HEATING

T2 Evaporator
temp. sensor

T1 Room temp.
sensor

T3 Condenser
temp. sensor

T5 Discharge
temp. sensor

T4 Ambient
temp. sensor

INDOOR OUTDOOR

Electronic
expansion valve

CAPILIARY TUBE

Accumulator

CAPILIARY TUBE

12

5. Wiring Diagram

5.1 Indoor Unit

MS11M-09HRFN1-MW0W, MS11M-12HRFN1-MV0W, MS11M-18HRFN1-MU0W

13

MS11M-24HRDN1-MT0W

14

5.2 Outdoor Unit

MOC-09HFN1-MW0W, MOC-12HFN1-MV0W

15

MOF-18HFN1-MU0W

16

MOG-24HFN1-MT0W

MOC-09HFN1-MW0W, MOC-12HFN1-MV0W

17

MOF-18HFN1-MU0W

18

MOG-24HFN1-MT0W

19

6 Installation Details

6.1 Wrench torque sheet for
installation

Outside diameter

Torque

Additional tightening

torque

Ф6.35mm

1/4in

1500N.cm(153kgf.cm)

1600N.cm(163kgf.cm)

Ф9.52mm

3/8in

2500N.cm(255kgf.cm)

2600N.cm(265kgf.cm)

Ф12.7mm

1/2in

3500N.cm(357kgf.cm)

3600N.cm(367kgf.cm)

Ф15.9mm

5/8in

4500N.cm(459kgf.cm)

4700N.cm(479kgf.cm)

Ф19mm

3/4in

6500N.cm(663kgf.cm)

6700N.cm(683kgf.cm)

6.2 Connecting the cables

The power cord should be selected according
to the following specifications sheet.

Appliance Amps

AWG Wire Size

10

18

13

16

18

14

25

12

30

10

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.

6.3 Pipe length and the elevation

Models

Pipe size

Gas

Liquid

MS11M-09HRFN1-MW0W+MOC-09HFN1-MW0W

3/8in

(Ф9.52mm)

1/4in

(Ф6.35mm)

MS11M-12HRFN1-MV0W+MOC-12HFN1-MV0W

1/2in

(Ф12.7mm)

1/4in

(Ф6.35mm)

MS11M-18HRFN1-MU0W+MOF-18HFN1-MU0W

1/2in

(Ф12.7mm)

1/4in

(Ф6.35mm)

MS11M-24HRDN1-MT0W+MOG-24HFN1-MT0W

5/8in

(Ф15.9mm)

3/8in

(Ф9.52mm)

Models

Standard

length

Max.

Elevation

Max.

Length

A

Additional

refrigerant

MS11M-09HRFN1-MW0W+
MOC-09HFN1-MW0W

7.5m

(24.6ft)

10m

(32.8ft)

25m

(82.0ft)

15g/m

(0.16oz/ft)

MS11M-12HRFN1-MV0W+M
OC-12HFN1-MV0W

7.5m

(24.6ft)

10m

(32.8ft)

25m

(82.0ft)

15g/m

(0.16oz/ft)

MS11M-18HRFN1-MU0W+M
OF-18HFN1-MU0W

7.5m

(24.6ft)

20m

(65.6ft)

30m

(98.4ft)

15g/m

(0.16oz/ft)

MS11M-24HRDN1-MT0W+M
OG-24HFN1-MT0W

7.5m

(24.6ft)

25m

(82.0ft)

50m

(164ft)

30g/m

(0.32oz/ft)

20

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(14.5Psi). If the meter does not

indicate -0.1Mpa(14.5Psi) after pumping 30
minutes, it should be pumped 20 minutes

more. If the pressure can’t achieve

-0.1Mpa(14.5Psi) 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.

21

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.
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 0.3Mpa(43.5Psi) to 0.5

Mpa(72.5Psi).

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.

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.

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.

22

4). Set the 2-way valve to the close position.

5). Operate the air conditioner at the cooling
cycle and stop it when the gauge indicates

0.1Mpa(14.5Psi).

6). Set the 3-way valve to the closed position
immediately
Do this quickly so that the gauge ends up
indicating 0.3Mpa(43.5Psi) to 0.5 Mpa(72.5Psi).
Disconnect the charge set, and tighten the
2-way and 3-way valve’s stem nuts.
Use a torque wrench to tighten the 3-way valves
service port cap to a torque of 18N.m.
Be sure to check for gas leakage.

2. Air purging by the 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
Leave the valve on the charging cylinder closed.

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.
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 0.3Mpa(43.5Psi) to 0.5

Mpa(72.5Psi).

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.

6.7 Re-installation while the outdoor

unit need to be repaired

1. Evacuation for the whole system

Procedure:

1). Confirm that both the 2-way and 3-way

valves are set to the opened position.

2). Connect the vacuum pump to 3-way valve’s

service port.

3). Evacuation for approximately one hour.

Confirm that the compound meter indicates

-0.1Mpa(14.5Psi).

4). Close the valve (Low side) on the charge set,

turn off the vacuum pump, and confirm that the
gauge needle does not move (approximately 5
minutes after turning off the vacuum pump).

5). Disconnect the charge hose from the

vacuum pump.

23

2. Refrigerant charging

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 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). Open the valves (Low side) on the charge
set and charge the system with liquid refrigerant
If the system cannot be charge with the
specified amount of refrigerant, or can be
charged with a little at a time (approximately
150g each time) , operating the air conditioner
in the cooling cycle; however, one time is not
sufficient, wait approximately 1 minute and then
repeat the procedure.

5).When the electronic scale displays the
proper weight, disconnect the charge hose from
the 3-way valve’s service port immediately
If the system has been charged with liquid
refrigerant while operating the air conditioner,
turn off the air conditioner before disconnecting
the hose.

6). Mounted 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.

24

7. Operation Characteristics

Temperature

Mode

Cooling operation

Heating operation

Drying operation

Room temperature

≥17°C
(62°F)

≤30°C

(86°F)

＞10°C

(50°F)

Outdoor temperature

0°C～50°C

(32°F～122°F)

-15°C～30°C
(5°F～86°F)

0°C～50°C

(32°F～122°F)

-15°C～50°C
(5°F～122°F)

(For the models with

low temperature cooling system)

ΔT(℉) =

9ΔT(℃)

5

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.

25

8. Electronic Function

8.1 Abbreviation

T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature

8.2 Display function

8.2.1 Icon explanation on indoor display board.

ION indication lamp(optional function)：This lamp illuminates when Clean Air
feature is activated.

DEFROST indication lamp(For cooling & heating models only): Lights up
when the air conditioner starts defrosting automatically or when the warm air
control feature is activated in heating operation.

OPERATION indication lamp：This lamp illuminates when the air conditioner is in
operation.

TIMER indication lamp：Lights up during Timer operation.

Temperature indicator：Displays the temperature settings when the air conditioner

is operational. Displays the malfunction code.

26

8.3 Main Protection

8.3.1 Three minutes delay at restart for compressor

1 minute delay for the 1st time stand-up and 3 minutes delay for others.

8.3.2 Temperature protection of compressor top

The unit will stop working when the compressor top temp. protector cut off, and will restart after the
compressor top temp. protector restart.

8.3.3 Temperature protection of compressor discharge

When the compressor discharge temp. is getting higher, the running frequency will be limited as below
rules:

---Compressor discharge temp. T5>115°C(239°F) for 5s, compressor stops.

---108°C (226°F)<T5<115°C(239°F), decrease the frequency to the lower level every 3 minutes.

---90°C(194°F)<T5<105°C(221°F), keep running at the current frequency.

----T5<90°C(194°F), no limit for frequency.

8.3.4 Fan speed is out of control

When Indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will
display the failure

8.3.5 Inverter module protection

The Inverter module has a protection function about current, voltage and temperature. If these
protections happen, the corresponding code will display on indoor unit and the unit will stop working.

8.3.6 Indoor fan delayed open function

When the unit starts up, the louver will be active immediately and the indoor fan will open 10s later.
If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function.

8.3.7 Compressor preheating functions

Preheating permitting condition:
If T4(outdoor ambient temperature)＜3°C(37.4°F) and the machine connects to power supply newly or
if T4＜3°C(37.4°F) and compressor has stopped for over 3 hours, the compressor heating cable will
work.
Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of the compressor, then the
compressor is heated without operation.
Preheating release condition:
If T4＞5°C(41°F) or the compressor starts running, the preheating function will stop.

8.3.8 Zero crossing detection error protection

If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display
the failure. The correct zero crossing signal time interval should be between 6-13ms.

8.3.9 Condenser temperature protection

---55°C(131°F)<T3<60°C(140°F), the compressor frequency will decrease to the lower level until to F1
and then runs at F1.If T3<54°C(129.2°F), the compressor will keep running at the current frequency.

---T3<52°C(125.6°F), the compressor will not limit the frequency and resume to the former frequency.

---T3>60°C(140°F) for 5 seconds, the compressor will stop until T3<52°C(125.6°F).

8.3.10 Evaporator temperature protection

---T2<0°C(32°F), the compressor will stop and restart when T2≧5°C(41°F).

---0°C(32°F)≦T2<4°C(39.2°F), the compressor frequency will be limited and decreased to the lower
level

---4°C(39.2°F)≤T2≤7°C(44.6°F), the compressor will keep the current frequency.

27

---T2>7°C(44.6°F), the compressor frequency will not be limited.

28

8.4 Operation Modes and Functions

8.4.1 Fan mode

(1) 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 same as in cooling
mode.
(5) Auto fan:
For MS11M-09HRFN1-MW0W,
MS11M-12HRFN1-MV0W,
MS11M-18HRFN1-MU0W models:

a

b

c

d

6.0¡ãC(42.8¡ãF)

T1-24¡ãC(75.2¡ãF)

e

H
(H-L)*0.75+L
(H-L)*0.5+L
(H-L)*0.25+L
L

5.0¡ãC(41.0¡ãF)

4.0¡ãC(39.2¡ãF)

2.5¡ãC(36.5¡ãF)

1.0¡ãC(33.8¡ãF)

For MS11M-24HRDN1-MT0W model:

27.5¡ãC(81.5¡ãF)

T1

27.0¡ãC(80.6¡ãF)

High

Low

25.0¡ãC(77.0¡ãF)

Medium

25.5¡ãC(77.9¡ãF)

8.4.2 Cooling Mode

8.4.2.1 Compressor running rules

The maximum operation frequency of
compressor after starting submits to following
rule.

45¡ãC(113¡ãF)

40¡ãC(104¡ãF)

38¡ãC(100.4¡ãF)

31.5¡ãC(88.7¡ãF)

29.5¡ãC(85.1¡ãF)

22.0¡ãC(71.6¡ãF)

20.0¡ãC(68.0¡ãF)

Fmax=F4

Fmax=F7

Fmax=F8

Fmax=F6

Fmax=F3

T4

43¡ãC(109.4¡ãF)

Fmax: The maximum operation frequency of
compressor.
F1~F8: The detailed value of the compressor
operation frequency.
If users switch on AC by remote controller, the
compressor will run at the Fmax frequency for 7
minutes according to the outdoor ambient temp.
During the 7 minutes, the frequency limitation is
active. 7 minutes later, the compressor running
frequency will be controlled as below:

3.5¡ãC(38.3¡ãF)

-0.5¡ãC(31.1¡ãF)

T1-Ts

-1.0¡ãC(30.2¡ãF)

A

B

C

D

E

F

G

H

3.0¡ãC(37.4¡ãF)

2.5¡ãC(36.5¡ãF)

2.0¡ãC(35.6¡ãF)

1.5¡ãC(34.7¡ãF)

1.0¡ãC(33.8¡ãF)

0.5¡ãC(32.9¡ãF)

While the zones of A,B,C... are corresponding
to different compressor running frequency.

Note: