Midea MEHS-12PSH1, MEHSU-12PHH2, MEHSU-09PHH2, MEHSU-24PHH2, MEHS-30PSH2 Service Manual

Mission 3D Inverter Series

Service Manual 2016

MBSUL-A-1604

CONTENTS

1. Precaution .................................................................................................................................................... 3

1.1 Safety Precaution .......................................................................................................................... 3

1.2 Warning ......................................................................................................................................... 3

2. Model list ...................................................................................................................................................... 6

3. Dimension .................................................................................................................................................... 7

3.1 Indoor Unit ..................................................................................................................................... 7

3.2 Outdoor Unit .................................................................................................................................. 9

4. Refrigerant Cycle Diagram ....................................................................................................................... 10

5. Wiring Diagram ........................................................................................................................................... 11

5.1 Indoor Unit .................................................................................................................................... 11

5.2 Outdoor Unit ................................................................................................................................ 13

6 Installation Details ...................................................................................................................................... 15

6.1 Wrench torque sheet for installation ........................................................................................... 15

6.2 Connecting the cables ................................................................................................................ 15

6.3 Pipe length and the elevation ..................................................................................................... 15

6.4 Installation for the first time ......................................................................................................... 16

6.5 Adding the refrigerant after running the system for many years ................................................ 16

6.6 Re-installation while the indoor unit need to be repaired ........................................................... 17

6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 18

7. Operation Characteristics ......................................................................................................................... 19

8. Electronic function .................................................................................................................................... 20

8.1 Abbreviation ................................................................................................................................ 20

8.2 Display function ........................................................................................................................... 20

8.3 Main Protection ........................................................................................................................... 21

8.4 Operation Modes and Functions ................................................................................................. 22

9. Troubleshooting ......................................................................................................................................... 28

9.1 Indoor Unit Error Display ............................................................................................................. 29

9.2 Outdoor unit error display ........................................................................................................... 30

9.3 Diagnosis and Solution ............................................................................................................... 34

10 Disassembly Instructions ........................................................................................................................ 63

10.1 Indoor unit ................................................................................................................................. 63

10.2 Outdoor unit .............................................................................................................................. 67

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 fore

or 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.

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.

 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.

2. Model list

Model Names of Indoor/Outdoor Units

3D inverter

Capacity Indoor units Outdoor units

9k(115V) MEHS-09PSH1 MCHS-09PSH1

9k MEHSU-09PHH2 MCHSU-09PHH2

12k(115V)

MEHS-12PSH1

MCHS-12PSH1

12k MEHSU-12PHH2 MCHSU-12PHH2

18k

MEHSU-18PHH2 MCHSU-18PHH2

24k MEHSU-24PHH2 MCHSU-24PHH2

30k MEHS-30PSH2 MCHS-30PSH2

36k MEHS-36PSH2 MCHS-36PSH2

3. Dimension

3.1 Indoor Unit

Model W D H

9k(115V&230V) 31.89(810) 7.87(200) 11.81(300)

12k(115V&230V) 31.89(810) 7.87(200) 11.81(300)

18k 42.91(1090) 9.25(235) 13.31(338)

24k 42.91(1090) 9.25(235) 13.31(338)

30k 54.15(1350) 10.71(272) 14.37(365)

36k 54.15(1350) 10.71(272) 14.37(365)

For 9k & 12k:

For 18k & 24k:

For 30k & 36k:

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)

Fe

n

c

e

o

r

o

b

s

t

a

c

l

e

s

More than 30cm(11.8in)

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

Model W in(mm) D in(mm) H in(mm) W1 in(mm) A in(mm) B in(mm)

9k(115V) 30.31(770) 11.81(300) 21.85(555) 33.07 (840) 19.2(487) 11.73(298)

12k(115V) 31.50(800) 13.11(333) 21.81(554) 34.25(870) 20.24(514) 13.39(340)

9k(230V) 31.50(800) 13.11(333) 21.81(554) 34.25(870) 20.24(514) 13.39(340)

12k(230V) 31.50(800) 13.11(333) 21.81(554) 34.25(870) 20.24(514) 13.39(340)

18k 35.98(845) 14.29(363) 27.63(702) 35.98(914) 21.26(540) 13.78(350)

24k

37.24(946) 16.54(420) 31.89(810) 40.55(1030) 26.50(673) 15.87(403)

30k

36k

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

ACCUMULATOR

INDOOR OUTDOOR

CHECK VALVE (Heating Model only)

CAPILIARY TUBE

5. Wiring Diagram

5.1 Indoor Unit

MEHS-09PSH1, MEHS-12PSH1,

MEHSU-09PHH2, MEHSU-12PHH2

MEHSU-18PHH2, MEHSU-24PHH2, MEHS-30PSH2, MEHS-36PSH2,

5.2 Outdoor Unit

MCHS-09PSH1, MCHS-12PSH1,

MCHSU-09PHH2, MCHSU-12PHH2, MCHSU-18PHH2,

MCHSU-24PHH2,, MCHS-30PSH2, MCHS-36PSH2,

6 Installation Details

6.1 Wrench torque sheet for installation

Outside diameter

Torque

Additional tightening

torque

Ф

6.35mm

1/4in

1500N.cm(153kgf.cm/

11lb.ft)

1600N.cm(163kgf.cm/1

1.8lb.ft)

Ф

9.52mm

3/8in

2500N.cm(255kgf.cm/

18.4lb.ft)

2600N.cm(265kgf.cm/1

9.18lb.ft)

Ф

12.7mm

1/2in

3500N.cm(357kgf.cm/

25.8lb.ft)

3600N.cm(367kgf.cm/2

6.55lb.ft)

Ф

15.9mm

5/8in

4500N.cm(459kgf.cm/

33.19lb.ft)

4700N.cm(479kgf.cm/3

4.67lb.ft)

Ф19mm

3/4in

6500N.cm(663kgf.cm/

47.94lb.ft)

6700N.cm(683kgf.cm/4

9.41lb.ft)

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

9k 3/8in(Ф9.52mm) 1/4in(Ф6.35mm)

12k

1/2in(Ф12.7mm) 1/4in(Ф6.35mm)

18k

24k

5/8in (Ф15.9mm) 3/8in(Ф9.52mm)

30k

36k

Models

Standard

length

Max. Elevation

Max. Length

A

Additional

refrigerant

9k

&12k

7.5m(24.6ft) 10m(32.8ft) 25m(82.0ft) 15g/m(0.16oz/ft)

18k

7.5m(24.6ft)

20m(65ft) 30m(98ft) 15g/m(0.16oz/ft)

24k

7.5m(24.6ft)

25m(82ft) 50m(164ft) 30g/m(0.32oz/ft)

30k

7.5m(24.6ft)

25m(82ft) 50m(164ft) 30g/m(0.32oz/ft)

36k

7.5m(24.6ft)

30m(82.0ft) 65m(213ft)

30g/m(0.32oz/ft)

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.

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.

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 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.

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.

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.

7. Operation Characteristics

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.

9k(115V) 12k(115V) 9k(230V) 12k(230V) 18k 24k 30k 36k

Operating Range

Cooling

Outdoor

Min - Max

DB

°F (°C)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

4-122

(-20-50)

Indoor Min

- Max DB

°F (°C)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

63-86

(17-30)

Indoor Min

- Max WB

°F (°C)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

59-84

(15-29)

Heating

Outdoor

DB Min –

Max

°F

(°C)

4-86

(-20-30)

4-86

(-20-30)

(-22)-86

(-30-30)

(-22)-86

(-30-30)

(-22)-86

(-30-30)

(-22)-86

(-30-30)

4-86

(-20-30)

4-86

(-20-30)

Outdoor

WB Min –

Max

°F (-4)-77 (-4)-77 (-4)-77 (-4)-77 (-4)-77 (-4)-77 (-4)-77 (-4)-77

(°C) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25) (-20-25)

Indoor DB

Min –Max

°F

(°C)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

32-86

(0-30)

8. Electronic function

8.1 Abbreviation

T1: Indoor room temperature

T2: Coil temperature of evaporator

T3: Coil temperature of condenser

T4: Outdoor ambient temperature

TP: Compressor discharge temperature

8.2 Display function

8.2.1 Icon explanation on indoor display board.

Digital display:

Displays the temperature settings when the air

conditioner is operational.

Displays the room temperature in FAN mode.

Displays the self-diagnostic codes.

Dispalys ‘ ’ for three seconds when Timer

ON, Fresh, Swing, Turbo or Silence feature is

activated.

Dispalys ‘ ’ for three seconds when Timer

OFF is set.

Dispalys ‘ ’ for three seconds when Fresh,

Swing, Turbo or Silence feature is cancelled.

Dispalys ‘ ’ under deforsting operation.

Dispalys ‘ ’ when anti-cold air feature is

activated under heating mode.

Dispalys ‘ ’ during self clean operation (if

aplicable).

Dispalys ‘ ’ under 8℃ heating operation (if

aplicable).

When ECO function(optional) is actived,the

“ ” illuminates gradually one by one as

In one second interval.

WIFI control display(optional)

Displays when the WIFI control feature is

actived. (Not available when the unit does not

have this function)

NOTE:

A guide on using the infrared remotr is included

in this literature package.

8.3 Main Protection

8.3.1 Three minutes delay at restart for

compressor

Less than 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

Compressor discharge temp. TP>115℃ for 5s,

compressor stops.

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 7s

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: When T4(outdoor ambient temperature)＜3°C,

the preheating function will be activated.

8.3.8 Sensor protection at open circuit and

breaking disconnection.

When there’s only one temperature sensor in

malfunction , the air conditioner will keep

working but show the error code, in case of any

emergency use.

When there’s more than one temperature

sensor in malfunction, the air conditioner will

stop working

8.3.9 Refrigerant leakage detection

This function is only active in cooling mode. It

can better prevent the compressor being

damaged by refrigerant leakage or compressor

overload.

Open condition:

When compressor is active, the value of the

Coil temperature of evaporator T2 has no

change or very little change.

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:

a

b

c

d

T 1

e

8.4.2 Cooling Mode

8.4.2.1 Compressor running rules

When T1-Ts<-2℃, the compressor will stop, when T1—TS>-0.5℃，the compressor will be

activated.

When the AC run in mute mode, the

compressor will run with low frequency.

When the current is more than setting value,

the current protection function will be activated,

and the compressor will stop.

8.4.2.2 Outdoor fan running rules

The outdoor unit will be run at different fan

speed according to T4.

For different outdoor units, the fan speeds are

different

T 4

A +

A

B

C

D

E

8.4.2.3Indoor fan running rules

In cooling mode, indoor fan runs all the time

and the speed can be selected as high,

medium, low and auto.

When the setting temp. is reached, if the

compressor stop running, indoor fan motor will

run in Minimum speed or setting speed.

The indoor fan is controlled as below:

Setting fan

speed

Actual fan speed

H+(H+=H+G) A H（=H） B C

M+(M+=M+Z) D M(M=M) E F

L+(L+=L+D) G L(L=L) H I

T1-Td ℃(°F)

L

L-(L-=L-D)

H

H-（H-=H-G)

M

M-(M-=M-Z)

The auto fan acts as below rules:

a

b

c

d

T 1

e

8.4.2.4 Condenser temperature protection

T3

Resume

Off

Decrease

Hold

When condenser temperature temp. is more

than setting value, the compressor will stop.

8.4.2.5 Evaporator temperature protection

When Evaporator temperature temp.is less

than setting value, the compressor will stop.

8.4.3 Heating Mode

8.4.3.1 Compressor running rules

When T1-Ts>-ΔT, the compressor will stop,

when T1-TS<ΔT-1.5 时，the compressor will be

on.

ΔT is the programmed parameter of

temperature compensation.

When the AC run in mute mode, the

compressor will run with low frequency.

When the current is more than setting value,

the current protection function will be activated

and the compressor will stop.

8.4.3.2 Outdoor fan running rules

The outdoor unit will be run at different fan

speed according to T4.

For different outdoor units, the fan speeds are

different

T 4

E

D

C

B

A

A +

8.4.3.3 Indoor fan running rules

When the compressor is on, the indoor fan can

be set to high/med/low/auto/mute.

When indoor unit coil temp. is low, the anti-cold

air function will start and indoor fan motor will

run at low speed, the speed can’t be

changed ,when the temp. is lower than setting

value, the indoor fan motor will stop.

When the indoor temp reaches the setting

temp., the compressor will stop, the indoor fan

motor will run at the minimum speed or setting

speed.(The anti-cold air function is valid).

The indoor fan is controlled as below:

Setting fan

speed

Actual fan speed

H（=H）

H+(H+=H+G)

M(M=M)

M+(M+=M+Z)

L(L=L)

L+(L+=L+D)

H-（H-=H-G)

M-(M-=M-Z)

L-(L-=L-D)

T1-Td

℃

L

H

M

Auto fan action in heating mode:

T 1 -T d + Δ T

8.4.3.4Defrosting mode

AC will enter the defrosting mode according to

the value of temp. of T3 and the value range of

temp. change of T3 and also the compressor

running time.

During the defrosting mode, the compressor

keep running, indoor and outdoor motor will stop,

defrost lamp of the indoor unit will be lighted

“ .” Will be displayed.

8.4.3.5 Evaporator coil temperature

protection

Resume

Off

Decrease

Hold

When evaporator temperature temp. is more

than the setting protection value, the

compressor will stop.

8.4.4 Auto-mode

This mode can be chosen with remote

controller and the setting temperature can be

changed between 17°C~30°C

In auto mode, the machine will choose cooling,

heating or fan-only mode according to ΔT (ΔT

=T1-Ts).

T1-Ts

Cooling

Heating*

Fan only

Heating*: For cooling only models, they will run

at fan speed

Indoor fan will run at auto fan of the relevant

mode.

The louver operates same as in relevant mode.

If the machine switches mode between heating

and cooling, the compressor will keep stopping

for certain time and then choose mode

according to T1-Ts.

If the setting temperature is modified, the

machine will choose running function again.

8.4.5 Drying mode

Indoor fan speed is fixed at breeze and can’t be

changed. The louver angle is the same as in

cooling mode.

All protections are active and the same as that

in cooling mode.

8.4.6 Forced operation function

Forced cooling mode:

The compressor and outdoor fan keep running

and the indoor fan runs at low speed. 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.

When AC receives signals, such as switch on,

switch off, timer on, timer off, mode setting, fan

speed setting, sleeping mode setting, follow me

setting, it will quit the forced operation.

8.4.7 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

certain time when power returns.

If the memorization condition is forced cooling

mode, the unit will run in cooling mode for certain time and turn to auto mode as 24℃

setting temp.

If AC is off before power off and AC is required

to start up now, the compressor will have 1

minute delay when power on. Other conditions,

the compressor will have 3 minutes delay when

restarts.

8.4.8 8℃ Heating(optional)

When the compressor is running, the indoor fan

motor will run without anti-cold air function.

When the compressor is off, the indoor fan

motor is off .

8.4.9 Point check function

Press the LED DISPLAY or LED or MUTE button of the remote controller three times, and then press

the AIR DIRECTION or SWING button three times in ten seconds, the buzzer will keep ring for two

seconds. The air conditioner will enter into the information enquiry status. You can press the LED

DISPLAY or AIR DIRECTION button to check the next or front item’s information.

When the AC enter the “information enquiry” status, it will display the code name

in 2 seconds, the

details are as follows.

Enquiry information Displaying code Meaning

T1 T1 T1 temp.

T2 T2 T2 temp.

T3 T3 T3 temp.

T4 T4 T4 temp.

T2B Tb T2B temp.

TP TP TP temp.

TH TH TH temp.

Targeted Frequency FT Targeted Frequency

Actual Frequency Fr Actual Frequency

Indoor fan speed IF Indoor fan speed

Outdoor fan speed OF Outdoor fan speed

EXV opening angle LA EXV opening angle

Compressor continuous running time CT Compressor continuous

running time

Causes of compressor stop. ST Causes of compressor

stop.

Reserve A0

Reserve

A1

Reserve

0

Reserve

1

Reserve

2

Reserve

3

Reserve

4

Reserve

5

Reserve

6

Reserve

L

Reserve

A

Reserve

U

Reserve

T

When the AC enter into the information enquiry status, it will display the code value in the next 25s

, the

details are as follows.

Enquiry

information

Display value Meaning Remark

T1,T2,T3,T4,

T2B,TP,TH,

Targeted

Frequency,

Actual

Frequency

-1F,-1E,-1d,-1c,-

1b,-1A

-25,-24,-23,-22,-21,-20 1. All the displaying temperature is actual

value.

2. All the temperature is °C no matter what

kind of remote controller is used.

3. T1,T2,T3,T4,T2B display range:-25~70,

TP display range:-20~130.

4. Frequency display range: 0~159HZ.

5. If the actual value exceeds the range, it

will display the maximum value or minimum

value.

-19—99 -19—99

A0,A1,…A9 100,101,…109

b0,b1,…b9 110,111,…119

c0,c1,…c9 120,121,…129

d0,d1,…d9 130,131,…139

E0,E1,…E9 140,141,…149

F0,F1,…F9 150,151,…159

Indoor fan

speed

/Outdoor fan

speed

0 OFF

1,2,3,4 Low speed, Medium

speed, High speed,

Turbo

For some big capacity motors.

14-FF Actual fan

speed=Display value

turns to decimal

value and then

multiply 10. The unit

is RPM.

For some small capacity motors,

display value is from 14-FF(hexadecimal),

the corresponding fan speed range is from

200-2550RPM.

EXV opening

angle

0-FF Actual EXV opening

value=Display value

turns to decimal

value and then

multiply 2.

Compressor

continuous

running time

0-FF 0-255 minutes If the actual value exceeds the

range, it will display the maximum

value or minimum value.

Causes of

compressor

stop.

0-99 For the detailed

meaning, please

consult with engineer

Decimal display

Reserve 0-FF

9. Troubleshooting

Safety

Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity

power in capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, -

terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

Note: The picture above is only for reference. The plug of your side may be different.

9.1 Indoor Unit Error Display

Operation

lamp

Timer lamp Display LED STATUS

☆ 1 time

X E0 Indoor unit EEPROM parameter error

☆ 2 times

X E1 Indoor / outdoor units communication error

☆ 4 times

X E3 Indoor fan speed has been out of control

☆ 5 times

X E4

Indoor room temperature sensor T1 open circuit or short

circuit

☆ 6 times

X E5

Evaporator coil temperature sensor T2 open circuit or

short circuit

☆ 7 times

X EC Refrigerant leakage detection

☆ 1 times

O F0

Overload current protection

☆ 2 times

O F1

Outdoor ambient temperature sensor T4 open circuit or

short circuit

☆ 3 times

O F2

Condenser coil temperature sensor T3 open circuit or

short circuit

☆ 4 times

O F3

Compressor discharge temperature sensor TP open

circuit or short circuit

☆ 5 times

O F4 Outdoor unit EEPROM parameter error

☆ 6 times

O F5 Outdoor fan speed has been out of control

☆ 1 times ☆

P0 IPM malfunction or IGBT over-strong current protection

☆ 2 times ☆

P1 Over voltage or over low voltage protection

☆ 3 times ☆

P2

High temperature protection of IPM module or

compressor top

☆ 4 times ☆

P3* Outdoor ambient temperature too low.

☆ 5 times ☆

P4 Inverter compressor drive error

☆ 7 times ☆

P6 Low pressure protection(Only for 36K)

O（light） X（off） ☆（flash）

*P3

1) In heating mode, when the outdoor temperature is lower than -25℃ for 1 hour, the indoor unit

display error code P3.

2) If the outdoor temperature is higher than -22℃ for 10 minutes and compressor stop for 1 hour or outdoor temperature is higher than -5℃ for 10 minutes, then the unit will return to work.

* Fault Symptom: The display board shows a garbled code or a code that is not an error code found

in the service manual nor a temperature reading.

Trouble shooting:

Use the remote controller. If the unit does not respond to the remote, the indoor PCB needs to be

replaced; if the unit does respond, then the display board needs to be replaced.

9.2 Outdoor unit error display

For MCHSU-09PHH2, MCHSU-12PHH2 , MCHSU-18PHH2 ,

Suction

Exhaust

+

17122200000309

HuiQi

TestPort

1

HEAT

4-WAY

W

BLUE

BLACK

RED

V

U

TPT3T4

No

NO

NO YES

Low-Fre

No

Have

YES

Have

Temp-Pro

Rdi

Ripm

11

PMV

44

15V17V

[V1.8] 2015-01-16

7815

22

1

34

REACTOR

311 TEST

7805

N-IN

DC-FAN

AC-FAN

L-IN

S

KFR-72W/BP2-( 311+0515+6061HD+ PSS30S92F6-AG+6822+HEAT).D.13.WP2.1

12V 5V

CN3

DSA1

K

A

K

D5

R18

R46

R

1

0

7

A

R515A

R316A

R18A

IC403

D4

C21

R54

R55

R68

R69

R56

R90

C14

J4

R16

R52

J5

+

LED1

R78

R142

R141

R155

R154

R153

R152

R151

R150

C3

R108

R107

RC2

RC4

RC1

RC3

C1

FUSE1

65T 250V30A

ZR1

ZR2

CN30

R109

R58

R61

R60

R59

C301

C76

C312

R315

C83

C85

C86

C91

R156R158

R169

R170

R171

R172

IC34

D11

R157

R159

C310

C306

C308

C311

C307

C309

R110

E305

C302

+

DZ301

Q3

R75

R84

C103

CN28

CN29

CN6-1

CN6

CN13

CN12

CN2

CN8

CN7

CN22

DR

CN21

DR

R102

J6

PTC1

CN414

R127

C105

+

E5

IPM2

C501

C503

C507

C508

C509

C510

C511

C512

C517

+

DZ501

R501

R502

R503

R504

R505

R506

R509

R510

R511

R512

R513

R514

R523

C502

C505

+

DZ502

R515

R522

+

DZ504

C504

R316

~ ~

IN

AC

-

+

R101 R100

R71

C42

CN20

RY5

CN16

CN18

NTC4

C8

C513

C514

C515

C516

R516 R517

R518 R519

R520

R521

C27

IC7

24LC512

33

49

17

1

IC9

R53

IC101

R160

+

E4

+

E3

R83

R82R81

R80

R79

R50

C47

C20

R322

R321

R320

Q2

IC405

+

E10

R120

R167

R166

R32

+

E1

R12

+

LED3

R412

R413

R414

R415

Rdi

Ripm

R13

CN24

R72

R8

R87

R74

J3

IC17

+

E24

D2

R124

C2

J2

J1

C77

AC AC

+

-

BR1

C13

D3

R7

RY3

RY4

RY2

CN5

R23

R24

R25

R26

R27

C74

C75

RY1

+

E14

C9

C17

C18

C19

C23

C24

C26

C32

C33

C35

C36

C37

C39

C43

C48

C49

C52

C65C67

C78

C87

C89

C90

C92

C147

C153

C25

CN9

CN23

CN39

+

E17

+

E23

+

E28

IC8

24LC08

IC12

24LC08

IC14

+

LED2

OSC1

R5

R30

R31

R40

R41

R42

R48

R49

R62

R64

R65 R66

R70

R73

R76

R77

R86

R92

R97

R161

R162

R163

R164

R165

R176

R177

R419

X1

C58

+

E405

IC404

R45

Q1

C15

C22

R21

R22

R28

R29

R33

+

E22

R3

R4

R121

C5

+

E6

R10

C28

C4

CN38

IC10

C79

C80

D7

C6

R148

R63

C506

R507

R508

+

E11

R106

C73

IC21

PC817

IC31

PC817

R175

R178

C409

IC402

C403

IC11

+

E402

D401

C401

R403

C411

C40

C50

D403

R401

R405

R406

R404

+

E404

D402

D404

C408

C402

+

E403

R407

R408

C404

C110

+

E409

+

E401

R402

C405

10

9

7

6

5

4

3

1

T401

C406

C407

D13

D14

+

E406

+

E407

+

E408

+

E502

+

E503

+

E504

+

DZ503

CN25

R6

R9

CN60

IC406

IC407

C7

D1

R1

R137

IC2

PC851

IC1 PC817

R2

R126

R125

R123 R122

R119

R118 R117

R15

R14

C99

C98

C97

C96 C95

C94

C93

C66

D20

R17

CN17

CN10

CN1

C41

R38

C45

C44

R136

R135

R134

R104

D12

D10

C54

+

D8

D9

R57

R20

C242

C243C244

R89

E2

R67

C84

C10

C11

IC4

C12

C38

R34

R47

R88

IC32

R39

R35

R36

R19

+

DZ6

R37

C46

C51

C53

CN19

+

DZ2

+

E27

IC3

PC817

IC5

PC817

Q8

R43

R44

R85

R91

R93

R95 R96

R99

D15

R51

+

E410

+

E8

C60

C61

E302

E303

E304

C62

VN1

VP1

U

P

VUB

U+

W

V+

V

W+

U-

VVB

VWB

FO

WV-

NV

NW

NU

VNC

CIN

IPM1

+

DZ304

+

DZ303

+

DZ302

C314

C316

C318

C30

C34

C31

ZR3

ZR4

C82

L1

R11

R140

CN27

E301

R168

IGBT1

connect to the DR module

connect to earth

fuse 250V 30A

connect to reactance

290-330VDC standby 210-300VDC running

power supply 208-230V AC connect to the terminal

connect to 4-way val ve when 4-way is on, output 208-230V AC

AC FAN mototr

connect to compressor heater when heater is on, output 208-230V AC

1 low speed

2 hign speed

3 ground

external drive motor connect to DC motor 0V AC standby 10~200V AC’ running

U

V W

connect to electric expansion valve

6 5 4 3 2 1

+12VDC

+12V DC pulse wa ve between( +4)-GND

+12V DC pulse wa ve between( +3)-GND

+12V DC pulse wa ve between( +2)-GND

+12V DC pulse wa ve between( +1)-GND

EEPROM Programmer Port

reserve

test port

Connect to PC communication

V

U

W

connect to PC communication

test port

LED2 （red）&LED3（green）: status light combination LED2 and LED3 show errors

（

refer to the attechment Word

）

LED: status light（yellow

）

slow flicker：standby（0.5Hz

）

quick flicker：error （2Hz

）

continuous li ght: running

internal drive motor

6 5 4 3 1

rotate speed feedback signal

0-15V square signal

drive power voltage: +15VDC

DC negative pole: GND

DC positive pole P: 315VDC

exhaust temp. sensor

pipe temp.sensor& room temp. sensor

TP T4 T3

7 6 5 4 3 2 1

RT

+5V DC

RT

+5V DC

CN5

/CN4 connect to

chassis

heater

when heater is on, output 208-230V AC

connect to DC motor

0V AC standby

10~200V AC’ running

bridge

IGBT

fast recovery diode (FRD)

IPM for compressor

IPM for DC FAN

reserve

P

N

For MCHS-09PSH1, MCHS-12PSH1,

N

1

1712200 0019195

1

[1.6] 20 15-09-30

US-KFR-35W/BP3N1-(115V+RX62T+41560).D.13.WP2-1

L-IN N-IN

7805

S

HEAT1

4-WAY

AC-FAN

HEAT2

Earth

DC-FAN

PMV

TESTPORT

BLACK

W

RED

V

BLUE

U

CN4_1

CN4_2

CN4_3CN4_4

REACTOR

CAP

T3T4

TP

N

H

L

CN25

CN31

AC

+

-

BR1

+

E2

CN21

RC1

E304

ZR2

+

-

AC

OUT

IN

~~

RY3A

SJ-S-112DMG

R191

IC105

CN15

ZR5

ZR4

R628

C618

R118

R123

R122

C324

IC2

R421

R621

D103

C413

C306

C319

IPM301

R176

R175

+

E109

C107

T401

R410

R409

R316

3W-10mΩ±1%

D407

+

C110

R623

R602

C624

RY3

R196

D610

C318

C316

C314

C134

+

E605

E303

E208

E206

E302

E300

CN50

R523

R522

R521

R520

R519

R518

R517

R323

R322

R321

R320

R319

R318

R317

IC301

C513

C512

C511

C323

C321

C320

R426

R314

R306

R305

R304

R303

C311

C310

C309

C308

C307

CN28

CN29

CN30

C520

C1

+

E106

C101

D101

C611

R171

D602

IC102

Rdi

D404

D401

CN6

ZR1

RY2

R626

R620

R619

R618

R617

R616

R615

R612 R611

R610

R608

R607

R605

R603

R601

R528

R516

R513

R508

R506

R504

R502

R429

R428

R427

R408

R407

R406

R405

R404

R403

R315

R301

R190

R188

R187

R186R1 85

R182 R181

R180

R179

R178

R174

R173

R170

R169

R168

R165

R157

R155 R154

R152

R150

R149 R148

R147

R144

R143

R142

R140

R138

R137

R136

R135

R133

R132

R131

R130

R129

R128

R127

R126

R125

R124

R121

R120

R117

R116

R115

R114

R112

R111

R110

R108

R107

R106

R105

R102

R101

R2

Q101

OSC101

NTC2

+

LED101

IC603

IC602

IC601

IC403

IC401

IC1

+

E602

+

E401

+

E108

+

E107

+

E105

+

E103

+

E102

+

E101

+

E1

+

E3

+ DZ601

DZ304

DZ303

DZ302

DZ301

+

DZ203

+

DZ202

D406

D402

+

D2

+

D1

1

CN505

CN7

C615

C614

C612

C606

C605

C601

C509

C508

C507

C506

C505

C504

C503

C412

C410

C409

C408

C405

C404

C403

C402

C401

C322

C312

C305

C303

C302

C274

C273

C272

C271

C133

C132

C131

C130 C129

C128

C127

C126

C125

C124

C123

C121

C120

C119

C118

C116

C115

C114

C113

C112

C111

C106

C105

C104

C103

C102

C16

C11

C10

C7

C6

C5

C4

C3

C2

+

E280

+

E281

+

E282

+

E283

+

E404

+

E407

PTC1

+

E409

D104

R401

R103

C117

R195

R172

+

DZ204

C275

R156

R604

R104

IC101

IC104

RY4

+

E410

+

E405

FUSE1

T20A/250VAC

C9A

CN1A

IC404

+

D403

IC103

C613

CN3

CN2

CN1

CN16

+

DZ201

L2L3L4L5

C135

CN17

R21 R23

R158

RY5

21

4

3

4

ON

1 2

ON

SW2

RC2

DSA1

IC405

+

CN60

C8

L1

R1

IPM501

C122

Comment

RY1

CN507

R606

3W-10mΩ±1%

R253

0.75Ω/1W R254

0.75Ω/1W

connect to compressor heater when is on, 100-130V AC output

connect to 4-way Valve when is on, 100-130VAC OUTPUT

connect to PFC Capacitor when is on, 100-130V AC output

connect to reactor when is on, 100-130V AC output

connect to Ground

connect to N-line

(100-130VAC INPUT)

connect to L-line (100-130VAC INPUT)

connect to indoor unit communication

U

V

W

10-230VAC’ (running)

0VAC (standby)

connect to DC Motor

external driver motor

connect to Electric Expansion Valve

pipe te mp.sensor& room temp. sensor&E xaust temp. sensor

6 5 4 3 2 1

TP T4 T3

RT

+5VDC

RT

+5VDC

+12V DC pulse wave between (+1)-GND

+12V DC pulse wave between (+2)-GND +12V DC pulse wave between (+3)-GND

+12V DC pulse wave between (+4)-GND

+12V DC +12V DC

6 5 4 3 2 1

AC fan motor

5 4 3 2

1

low speed

N line high speed

FAN Starting Capacitor

connect to chassis heater when is on, 100-130VAC OUTPUT

UV

W

0VAC(standby)

10-230VAC’(running)

connect to

compressor

connect to PC communication

EEPROM Programmer Port

Test Port

bridge

IPM for compressor

IPM for DC FAN

P

For MCHSU-24PHH2, MCHS-36PSH2, MCHS-30PSH2,

N

L

SHOW/SW

EARTH

[1.4]2014.06.26

EU-KFR105W/BP3T5N1-350S.D.13.WP1-1

L-OUT

N-OUT

CONNECT TO INVERTER driver

HIGHLOW

T2B-E

T2B-D

T2B-C

T2B-BT2B-A

TP

T4

T3

S-E

S-D

S-C

S-B

S-A

FAN_OUT

FAN_IN

AB

C

D

E

202302141206

CN19

CN10

N

CN9

S

CN44

HEAT2

CN43

FAN

CN42

C

CN41

C

CN40

HEAT1

CN34

CN33

CN30

CN29

CN28

CN27

CN26

CN22

4-WAY

CN20

CN18

CN17

CN16

CN14

CompTop

CN12

CN11

CN8

CN6

CN5

CN4

N

CN3

N

CN2

N-IN

CN1

L-IN

CN23

CN7

CN13

P-1

CN35

N

CN37

FAN-L

CN36

FAN-H

CN21

Electric Expansion Value B

Electric Expansion Value E

Electric Expansion Value D

Electric Expansion Value C

Electric Expansion Value A

485 communication

testPort connect to detector

external drive DC fan motor input terminal

external drive DC fan motor ouput terminal

current loop communication A

current loop communication B

current loop communication C

current loop communication D

current loop communication E

digital display

Fuse T30A/250V

connect to high and low pressure sensor

connect to trmp. sensor

Fuse 5A/250V

connect to earth

CN23 reserve

digital display button

test report connect to detector

CN43-5,CN43-1/CN41,CN42

AC fan motor capacitor

connector

CN43-4/CN37 CONNECT TO AC FAN MOTOR(LOW SPEED)

CN43-3/CN36 AC fan motor low speed connector CN43-2/CN35 AV fan motor N phase

current loop communication C

Signal wire

24VDC Pulse wave

connect to the terminal

208-230V AC

power supply

room temp sensor

pipe temp sensor

(3.3V)

high pressure sensor

low pressure sensor

Connect to the Indoor evap.pipe

out temp. sensor

T2B-A、T2B-B、T2B-C、T2B-D、T2B-E

+12V DC pulse wave between (+1)-GND

+12V DC pulse wave between (+2)-GND

+12V DC pulse wave between (+3)-GND

+12V DC pulse wave between (+4)-GND

+12V DC

6 5 4 3 2 1

when 4-way is ON, output 208-230VAC

connect to the 4-WAY

when heater is ON, output 208-230V AC

connect to compressor heater

CN44 L CN10 N

CN40 L CN4 N

CN22 L CN3 N

connect to exhaust temp. sensor

connect to the terminal

208-230V AC

external drive DC fan motor connector

T3

T4

electric

heater1

electric heater 2

IPM board,

202302141237

PFC -L2

[1.6]2014.10.16

EU-KFR105W/BP2T3N1-350(767).D.13.MP2-1

PFC-L1

EARTH

+

CN55

TO-MAIN

W

V

U

IPM2

IPM1

IC1424C08

CN54

L-IN2

N-IN2

OUT FAN(DC)

IC1

CN53

power supply

connect to the terminal

208-230V AC

CN54

CN51CN52

PFC inductance terminal

CN58

EATTH

+

210-300VDC (Running)

CAPACITOR Voltage

290-330VDC (standby)

CN55

TO MAIN

CN19

connect to DC fan motor

U

V

W

10-200VAC (running)

0VAC (standby)

connect to the compressor

U

V

W

10-200VAC (running)

0VAC (standby)

CN57 Debug

9.3 Diagnosis and Solution

9.3.1 EEPROM parameter error diagnosis and solution(E0/F4)

Error Code

E0/F4

Malfunction decision

conditions

Indoor or outdoor PCB main chip does not receive feedback

from EEPROM chip.

Supposed causes

●

Installation mistake

●

PCB faulty

Trouble shooting:

EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed

voltage. For the location of EEPROM chip, please refer to the below photos.

Indoor PCB

Outdoor PCB

Note: The two photos above are only for reference, it’s may be not same totally with the ones on

your side.

9.3.2 Indoor / outdoor unit’s communication diagnosis and solution(E1)

Error Code

E1

Malfunction decision

conditions

Indoor unit does not receive the feedback from outdoor unit during

110 seconds and this condition happens four times continuously.

Supposed causes

●

Wiring mistake

●

Indoor or outdoor PCB faulty

Trouble shooting:

Remark:

Use a multimeter to test the resistance

of the reactor which does not connect

with capacitor.

The normal value should be around zero

ohm. Otherwise, the reactor must have

malfunction.

Remark:

Use a multimeter to test the DC voltage

between 2 port and 3 port of outdoor unit.

The red pin of multimeter connects with 2

port while the black pin is for 3 port.

When AC is normal running, the voltage

will move alternately between -25V to

25V.

If the outdoor unit has malfunction, the

voltage will move alternately with positive

value.

While if the indoor unit has malfunction,

the voltage will be a certain value.

9.3.3 Zero crossing detection error diagnosis and solution (E2)

Error Code

E2

Malfunction decision

conditions

When PCB does not receive zero crossing signal feedback for 4

minutes or the zero crossing signal time interval is abnormal.

Supposed causes

●

Connection mistake

●

PCB faulty

Trouble shooting:

9.3.4 Fan speed has been out of control diagnosis and solution(E3)

Error Code

E3/F5

Malfunction decision

conditions

When indoor fan speed keeps too low (300RPM) for certain time,

the unit will stop and the LED will display the failure.

Supposed causes

●

Wiring mistake

●

Fan ass’y faulty

●

Fan motor faulty

●

PCB faulty

Trouble shooting:

Index 1:

1:Indoor or Outdoor DC Fan Motor(control chip is in fan motor)

Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor

connector. If the value of the voltage is not in the range showing in below table, the PCB must has

problems and need to be replaced.

DC motor voltage input and output(voltage: 220-240V~)

NO. Color Signal

Voltage

1 Red Vs/Vm

280V~380V

2 --- --- ---

3 Black GND 0V

4 White Vcc 14-17.5V

5 Yellow Vsp 0~5.6V

6 Blue FG 14-17.5V

DC motor voltage input and output(voltage :115V~)

NO. Color Signal

Voltage

1 Red Vs/Vm

140V~190V

2 --- --- ---

3 Black GND 0V

4 White Vcc 14-17.5V

5 Yellow Vsp 0~5.6V

6 Blue FG 14-17.5V

2. Outdoor DC Fan Motor (control chip is in outdoor PCB)

Power on ,and check if the fan can run normally, if the fan can run normally, the PCB must has

problems and need to be replaced, If the fan can’t run normally, measure the resistance of each two

pins. If the resistance is not equal to each other, the fan motor must have problems and need to be

replaced, otherwise the PCB must has problems and need to be replaced.

3. Indoor AC Fan Motor

Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds,

measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power

supply)or 50V(115V power supply), the PCB must has problems and need to be replaced.

9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5)

Error Code

E4/E5/F1/F2/F3

Malfunction decision

conditions

If the sampling voltage is lower than 0.06V or higher than 4.94V,

the LED will display the failure.

Supposed causes

●

Wiring mistake

●

Sensor faulty

Trouble shooting:

9.3.6 Refrigerant Leakage Detection diagnosis and solution(EC)

Error Code

EC

Malfunction decision

conditions

Define the evaporator coil temp.T2 of the compressor just starts

running as Tcool.

In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2

°C(

Tcool－35.6

°F)

does not keep continuous 4

seconds and this situation happens 3 times, the display area will

show “EC” and AC will turn off.

Supposed causes

●

T2 sensor faulty

●

Indoor PCB faulty

●

System problems, such as leakage or blocking.

Trouble shooting:

9.3.6 Overload current protection diagnosis and solution(F0)

Error Code

F0

Malfunction decision

conditions

An abnormal current rise is detected by checking the specified

current detection circuit.

Supposed causes

●

Power supply problems.

●

System blockage

●

PCB faulty

●

Wiring mistake

●

Compressor malfunction

Trouble shooting:

9.3.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)

Error Code

P0

Malfunction decision

conditions

When the voltage signal that IPM send to compressor drive chip

is abnormal, the display LED will show “P0” and AC will turn off.

Supposed causes

●

Wiring mistake

●

IPM malfunction

●

Outdoor fan ass’y faulty

●

Compressor malfunction

●

Outdoor PCB faulty

Trouble shooting:

For 9K~18K:

For example:

P-U

P-V

Note: The photos below are only for reference, it’s may be not same totally with the ones on your

side.

P-W

N-U

N-V

N-W

For 24K~36K:

At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or

close to 0, the IPM is defective. Otherwise, please follow the procedure below:

9.3.8 Over voltage or too low voltage protection diagnosis and solution(P1)

Error Code

P1

Malfunction decision

conditions

An abnormal voltage rise or drop is detected by checking the

specified voltage detection circuit.

Supposed causes

●

Power supply problems.

●

System leakage or block

●

PCB faulty

Trouble shooting:

Remark:

Measure the DC voltage

between P and N port. The

normal value should be

around 310V.

P

N

9.3.9 High temperature protection of IPM module or compressor top diagnosis and solution(P2)

Error Code

P2

Malfunction decision

conditions

If the sampling voltage is not 5V, the LED will display the failure.

Supposed causes

●

Installation mistake

●

Power supply problems.

●

System leakage or block

●

PCB faulty

Trouble shooting:

For MEHSU-09PHH2, MEHSU-12PHH2, MEHSU-18PHH2,

For other models,

9.3.10 Inverter compressor drive error diagnosis and solution(P4)

Error Code

P4

Malfunction decision

conditions

An abnormal inverter compressor drive is detected by a special

detection circuit, including communication signal detection,

voltage detection, compressor rotation speed signal detection

and so on.

Supposed causes

●

Wiring mistake

●

IPM malfunction

●

Outdoor fan ass’y faulty

●

Compressor malfunction

●

Outdoor PCB faulty

Trouble shooting:

For 9K~18K:

IPM continuity check

Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital

tester to measure the resistance between P and UVWN; UVW and N.

Digital tester Normal resistance value

(+)Red (-)Black

∞

(Several MΩ)

(+)Red (-)Black

∞

(Several MΩ)

P

N U

N

U V

V W

W (+)Red

For 24K~36K:

At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or

close to 0, the IPM is defective. Otherwise, please follow the procedure below:

9.3.11 Low pressure protection diagnosis and solution(P6)

Error Code

P6

Malfunction decision

conditions

When the pressure of system reach a certain value, the low

pressure protector will switch off. After the pressure resume to

normal ,the protection code will disappear.

Supposed causes

●

Wiring mistake

●

Pressure protector faulty

●

Fan motor faulty

●

PCB faulty

●

System problems.

Trouble shooting:

Whether the wiring

between the low pressure protector and main control board is connected well or

correctly

Method: Disconnect the

plug. Measure the

resistance of the low

pressure protector. If the

protector is normal the value

is o

Yes

Connect it well

Replace outdoor main board

No

Replace low pressure protector

No

Whether the low

pressure protector

is broken

Check whether the outdoor ambient temperature is too

low

No

Stop the unit

Yes

Open fully valve core of high

pressure valve

No

Check whether valve core of

high pressure valve is

opened

Check if the indoor fan runs

properly in cooling mode

please refer to the solution of [fan

speed has been out of control

malfunction]. Find out the cause and

have it solved.

No

Yes

No

Check whether the

refrigerant system is ok

Refrigerant is not enough add the

refrigerant

No

Main parts check

1. Temperature sensor checking

Disconnect the temperature sensor from PCB, measure the resistance value with a tester.

Temperature sensors.

Room temp.(T1) sensor,

Indoor coil temp.(T2) sensor,

Outdoor coil temp.(T3) sensor,

Outdoor ambient temp.(T4) sensor,

Compressor discharge temp.(TP) sensor.

Measure the resistance value of each winding by using the multi-meter.

Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (°C--K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 115.266 20 68 12.6431 60 140 2.35774 100 212 0.62973

-19 -2 108.146 21 70 12.0561 61 142 2.27249 101 214 0.61148

-18 0 101.517 22 72 11.5 62 144 2.19073 102 216 0.59386

-17 1 96.3423 23 73 10.9731 63 145 2.11241 103 217 0.57683

-16 3 89.5865 24 75 10.4736 64 147 2.03732 104 219 0.56038

-15 5 84.219 25 77 10 65 149 1.96532 105 221 0.54448

-14 7 79.311 26 79 9.55074 66 151 1.89627 106 223 0.52912

-13 9 74.536 27 81 9.12445 67 153 1.83003 107 225 0.51426

-12 10 70.1698 28 82 8.71983 68 154 1.76647 108 226 0.49989

-11 12 66.0898 29 84 8.33566 69 156 1.70547 109 228 0.486

-10 14 62.2756 30 86 7.97078 70 158 1.64691 110 230 0.47256

-9 16 58.7079 31 88 7.62411 71 160 1.59068 111 232 0.45957

-8 18 56.3694 32 90 7.29464 72 162 1.53668 112 234 0.44699

-7 19 52.2438 33 91 6.98142 73 163 1.48481 113 235 0.43482

-6 21 49.3161 34 93 6.68355 74 165 1.43498 114 237 0.42304

-5 23 46.5725 35 95 6.40021 75 167 1.38703 115 239 0.41164

-4 25 44 36 97 6.13059 76 169 1.34105 116 241 0.4006

-3 27 41.5878 37 99 5.87359 77 171 1.29078 117 243 0.38991

-2 28 39.8239 38 100 5.62961 78 172 1.25423 118 244 0.37956

-1 30 37.1988 39 102 5.39689 79 174 1.2133 119 246 0.36954

0 32 35.2024 40 104 5.17519 80 176 1.17393 120 248 0.35982

1 34 33.3269 41 106 4.96392 81 178 1.13604 121 250 0.35042

2 36 31.5635 42 108 4.76253 82 180 1.09958 122 252 0.3413

3 37 29.9058 43 109 4.5705 83 181 1.06448 123 253 0.33246

4 39 28.3459 44 111 4.38736 84 183 1.03069 124 255 0.3239

5 41 26.8778 45 113 4.21263 85 185 0.99815 125 257 0.31559

6 43 25.4954 46 115 4.04589 86 187 0.96681 126 259 0.30754

7 45 24.1932 47 117 3.88673 87 189 0.93662 127 261 0.29974

8 46 22.5662 48 118 3.73476 88 190 0.90753 128 262 0.29216

9 48 21.8094 49 120 3.58962 89 192 0.8795 129 264 0.28482

10 50 20.7184 50 122 3.45097 90 194 0.85248 130 266 0.2777

11 52 19.6891 51 124 3.31847 91 196 0.82643 131 268 0.27078

12 54 18.7177 52 126 3.19183 92 198 0.80132 132 270 0.26408

13 55 17.8005 53 127 3.07075 93 199 0.77709 133 271 0.25757

14 57 16.9341 54 129 2.95896 94 201 0.75373 134 273 0.25125

15 59 16.1156 55 131 2.84421 95 203 0.73119 135 275 0.24512

16 61 15.3418 56 133 2.73823 96 205 0.70944 136 277 0.23916

17 63 14.6181 57 135 2.63682 97 207 0.68844 137 279 0.23338

18 64 13.918 58 136 2.53973 98 208 0.66818 138 280 0.22776

19 66 13.2631 59 138 2.44677 99 210 0.64862 139 282 0.22231

Appendix 2 Temperature Sensor Resistance Value Table for TP (°C --K)

°C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm

-20 -4 542.7 20 68 68.66 60 140 13.59 100 212 3.702

-19 -2 511.9 21 70 65.62 61 142 13.11 101 214 3.595

-18 0 483 22 72 62.73 62 144 12.65 102 216 3.492

-17 1 455.9 23 73 59.98 63 145 12.21 103 217 3.392

-16 3 430.5 24 75 57.37 64 147 11.79 104 219 3.296

-15 5 406.7 25 77 54.89 65 149 11.38 105 221 3.203

-14 7 384.3 26 79 52.53 66 151 10.99 106 223 3.113

-13 9 363.3 27 81 50.28 67 153 10.61 107 225 3.025

-12 10 343.6 28 82 48.14 68 154 10.25 108 226 2.941

-11 12 325.1 29 84 46.11 69 156 9.902 109 228 2.86

-10 14 307.7 30 86 44.17 70 158 9.569 110 230 2.781

-9 16 291.3 31 88 42.33 71 160 9.248 111 232 2.704

-8 18 275.9 32 90 40.57 72 162 8.94 112 234 2.63

-7 19 261.4 33 91 38.89 73 163 8.643 113 235 2.559

-6 21 247.8 34 93 37.3 74 165 8.358 114 237 2.489

-5 23 234.9 35 95 35.78 75 167 8.084 115 239 2.422

-4 25 222.8 36 97 34.32 76 169 7.82 116 241 2.357

-3 27 211.4 37 99 32.94 77 171 7.566 117 243 2.294

-2 28 200.7 38 100 31.62 78 172 7.321 118 244 2.233

-1 30 190.5 39 102 30.36 79 174 7.086 119 246 2.174

0 32 180.9 40 104 29.15 80 176 6.859 120 248 2.117

1 34 171.9 41 106 28 81 178 6.641 121 250 2.061

2 36 163.3 42 108 26.9 82 180 6.43 122 252 2.007

3 37 155.2 43 109 25.86 83 181 6.228 123 253 1.955

4 39 147.6 44 111 24.85 84 183 6.033 124 255 1.905

5 41 140.4 45 113 23.89 85 185 5.844 125 257 1.856

6 43 133.5 46 115 22.89 86 187 5.663 126 259 1.808

7 45 127.1 47 117 22.1 87 189 5.488 127 261 1.762

8 46 121 48 118 21.26 88 190 5.32 128 262 1.717

9 48 115.2 49 120 20.46 89 192 5.157 129 264 1.674

10 50 109.8 50 122 19.69 90 194 5 130 266 1.632

11 52 104.6 51 124 18.96 91 196 4.849

12 54 99.69 52 126 18.26 92 198 4.703

13 55 95.05 53 127 17.58 93 199 4.562

14 57 90.66 54 129 16.94 94 201 4.426

15 59 86.49 55 131 16.32 95 203 4.294

16 61 82.54 56 133 15.73 96 205 4.167

17 63 78.79 57 135 15.16 97 207 4.045

18 64 75.24 58 136 14.62 98 208 3.927

19 66 71.86 59 138 14.09 99 210 3.812

Appendix 3:

°C °F °C °F °C °F °C °F °C °F

-5 23 21 69.8 51 123.8 82 179.6 113 235.4

-4 24.8 22 71.6 52 125.6 83 181.4 114 237.2

-3 26.6 23 73.4 53 127.4 84 183.2 115 239

-2 28.4 24 75.2 54 129.2 85 185 116 240.8

-1 30.2 25 77 55 131 86 186.8 117 242.6

0 32 25.5 77.9 56 132.8 87 188.6 118 244.4

0.5 32.9 26 78.8 57 134.6 88 190.4 119 246.2

1 33.8 27 80.6 58 136.4 89 192.2 120 248

1.5 34.7 28 82.4 59 138.2 90 194 121 249.8

2 35.6 29 84.2 60 140 91 195.8 122 251.6

2.5 36.5 30 86 61 141.8 92 197.6 123 253.4

3 37.4 31 87.8 62 143.6 93 199.4 124 255.2

3.5 38.3 32 89.6 63 145.4 94 201.2 125 257

4 39.2 33 91.4 64 147.2 95 203 126 258.8

4.5 40.1 34 93.2 65 149 96 204.8 127 260.6

5 41 35 95 66 150.8 97 206.6 128 262.4

6 42.8 36 96.8 67 152.6 98 208.4 129 264.2

7 44.6 37 98.6 68 154.4 99 210.2 130 266

8 46.4 38 100.4 69 156.2 100 212 131 267.8

9 48.2 39 102.2 70 158 101 213.8 132 269.6

10 50 40 104 71 159.8 102 215.6 133 271.4

11 51.8 41 105.8 72 161.6 103 217.4 134 273.2

12 53.6 42 107.6 73 163.4 104 219.2 135 275

13 55.4 43 109.4 74 165.2 105 221 136 276.8

14 57.2 44 111.2 75 167 106 222.8 137 278.6

15 59 45 113 76 168.8 107 224.6 138 280.4

16 60.8 46 114.8 77 170.6 108 226.4 139 282.2

17 62.6 47 116.6 78 172.4 109 228.2 140 284

18 64.4 48 118.4 79 174.2 110 230 141 285.8

19 66.2 49 120.2 80 176 111 231.8 142 287.6

20 68 50 122 81 177.8 112 233.6 143 289.4

Appendix 4

Normal voltage of P and N

208-240V(1-phase,3-phase) 380-420V(3-phase)

In standby

around 310VDC around 530VDC

In operation

With passive PFC

module

With partial active

PFC module

With fully active

PFC module

/

>200VDC >310VDC >370VDC >450VDC

2.Compressor checking

Measure the resistance value of each winding by using the tester.

Position Resistance Value

ASN98D22UFZ ASM98D32UFZ ATM115D43UFZ2

Blue - Red

1.57Ω

(20℃/68℉)

2.3Ω

(20℃/68℉)

1.78Ω

(20℃/68℉)

Blue - Black

Red - Blue

Position Resistance Value

ATF235D22UMT ATF250D22UMT

Blue - Red

0.75Ω

(20℃/68℉)

0.75Ω

(20℃/68℉)

Blue - Black

Red - Blue

3. IPM continuity check

Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital

tester to measure the resistance between P and UVWN; UVW and N.

Digital tester Normal resistance value

(+)Red (-)Black

∞

(Several MΩ)

(+)Red (-)Black

∞

(Several MΩ)

P

N U

N

U V

V W

W (+)Red

4: Pressure On Service Port

Cooling chart:

°F(°

C

)

ODT

IDT

75

(23.89)

85

(29.44)

95

(35)

105

(40.56)

115

(46.11)

BAR 70/59 8.2 7.8 8.1 8.6 10.1

BAR 75/63 8.6 8.3 8.7 9.1 10.7

BAR 80/67 9.3 8.9 9.1 9.6 11.2

°F(°

C

)

ODT

IDT

75

(23.89)

85

(29.44)

95

(35)

105

(40.56)

115

(46.11)

PSI 70/59 119 113 117 125 147

PSI 75/63 124 120 126 132 155

PSI 80/67 135 129 132 140 162

°F(°

C

)

ODT

IDT

75

(23.89)

85

(29.44)

95

(35)

105

(40.56)

115

(46.11)

MPA 70/59 0.82 0.78 0.81 0.86 1.01

MPA 75/63 0.86 0.83 0.87 0.91 1.07

MPA 80/67 0.93 0.89 0.91 0.96 1.12

Heating Chart:

°F

(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13

(-8.33/-10.56)

BAR 55 30.3 28.5 25.3 22.8 20.8

BAR 65 32.5 30.0 26.6 25.4 23.3

BAR 75 33.8 31.5 27.8 26.3 24.9

°F

(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13

(-8.33/-10.56)

PSI 55 439 413 367 330 302

PSI 65 471 435 386 368 339

PSI 75 489 457 403 381 362

°F

(°C)

ODT

IDT

57/53

(13.89/11.67)

47/43

(8.33/6.11)

37/33

(2.78/0.56)

27/23

(-2.78/-5)

17/13

(-8.33/-10.56)

MPA

55 3.03 2.85 2.53 2.28 2.08

MPA

65 3.25 3.00 2.66 2.54 2.33

MPA

75 3.38 3.15 2.78 2.63 2.49

10 Disassembly Instructions

Note: This part is for reference, the photos may have slight difference with your machine.

10.1 Indoor unit

No. Parts name Procedures Remarks

1 Front panel

How to remove the front panel.

1) Pull the below side of

the panel toward you and

remove the cover

2) Release the connector of

the display ass’y.

3) Release the two clips and

then remove the panel.

4) Remove the filter and the

horizontal louver.

5) Remove the two screws

and then remove the panel

ass’y.

②

⑤

2 Electrical

parts

How to remove the electrical

parts.

1) Remove the front

panel from procedure 1.

2) Pull out the room temp.

sensor (T1). Remove the two

screws for the ground

connection.

3) Remove the fixing screw.

4) Pull out the coil temp.

sensor.

5) From the side direction,

open the electronic control box

cover fixing by clips. Pull out

the fan motor connector and

swing motor connector. Then

remove the electronic control

box.

②

③

④

⑤

②

3 Evaporator

How to remove the evaporator.

1) After remove the

electrical parts from procedure

2, disassemble the pipe holder

at the rear side of the unit.

.

2) Remove the screws on the

evaporator at the fixed plate.

3) Remove the two screws

on the evaporator at the base

bearing side.

4) Then pull out the

evaporator.

③

①

②

4 Fan motor

and Fan

How to remove the fan motor.

1) Remove the front

panel, electrical parts and

evaporator following procedure

1-3.

2) Remove the two screws

and remove the fixing board of

fan motor.

3) Remove the fixing screw .

4) Pull out the fan motor and

fan ass’y from the side

direction.

②

③

10.2 Outdoor unit

Note: This part is for reference, the photos may have slight difference with your machine.

MCHS-09PSH1，

No. Part name Procedures Remarks

1 Panel plate

How to remove the panel

plate.

1)Stop operation of the

air conditioner and turn

“OFF” the power

breaker.

2) Remove the big handle

first,then remove the top

cover (3 screws)

3)Remove the screws of

front panel(7 screws)

(4) Remove the screws of

the right side panel(11

screws)

Screws of front panel(7 screws)

Screws of top panel(3 screws,1 screws is under

the big handle)

3 screw of

big handle

②

④

③

2

Fan ass’y

How to remove the fan

ass’y.

1)After remove the Air

outlet grille.

2) Remove the nut fixing

the fan, and remove the

fan.

3) After remove the top

cover .Unfix the hooks and

then open the electronic

control box cover.

○2

○3

4) Disconnect the

connector for fan motor

from the electronic control

board.

5) Remove the four fixing

screws of the fan motor,

then remove the motor.

○5

compressor

T3,T4,T5 sensor

Motor

Electronic expansion valve

4 way valve

④

3 Electrical

parts

How to remove the

electrical parts.

1) After finish work of

item 1 and item 2, remove

the connector for the

compressor .

2) Pull out the two blue

wires connected with the

four way valve.

3) Pull out connectors of

the condenser coil temp.

sensor(T3),outdoor

ambient temp. sensor(T4)

and discharge temp.

sensor(TP).

○1

○2 ○3

4) Disconnect the

electronic expansion valve

wire from the control board

5) Remove the ground

wires .

6) Remove the

wires(1,2,3). Then remove

the electronic control box.

○5 ○6

④

4 Four-way

valve

How to remove the

four-way valve.

1）Perform work of item

1,3.

2)Recover refrigerant from

the refrigerant circuit.

3)Remove the screw of the

coil and then remove the

coil.

4)Detach the welded parts

of four-way valve and pipe.

5)Then the four-way valve

ass’y can be removed

The picture of four-way valve may be different from

the one on your side.

5 Compressor

How to remove the

compressor.

1) After perform work of

item1,3. Recover

refrigerant from the

refrigerant circuit.

2) Remove the

discharge pipe and suction

pipe with a burner.

3) Remove the hex nuts

and washers fixing the

compressor on bottom

plate.

4) Lift the compressor

from the base pan

assembly.

○2

3

④

3

MCHSU-09PHH2，MCHS-12PSH1，MCHSU-12PHH2，

No. Part name Procedures Remarks

1 Panel plate

How to remove the panel

plate.

1) Stop operation of

the air conditioner and

turn “OFF” the power

breaker.

2)Remove the big handle

first, and then remove the

top panel(3 screws).

3) Remove the screws of

front panel(7 screws)

(4) Remove the screws of

the right side panel(11

screws)

Screws of top panel (3 screws, 1 screw is under the big

handler)

3 screws

of the big handler

7 screws of front panel

②

③

④

2 Fan ass’y

How to remove the fan

ass’y.

1)After remove the Air

outlet grille, remove the

hex nut fixing the fan and

then remove the fan.

2) After remove the top

cover .Unfix the hooks

and then open the

electronic control box

cover.

○1

○2

3)Disconnect the

connector for fan motor

from the electronic control

board.

4)Remove the four fixing

screws of the

fan motor.

Then remove the fan

motor.

○3

○4

compressor

T3,T4,T5 sensor

Motor

Electronic expansion valve

4 way valve

③

3 Electrical

parts

How to remove the

electrical parts.

1) After finish work of

item 1 and item 2, remove

the connectors for the

compressor.

2) Pull out the two blue

wires connected with the

four way valve.

3) Pull out connectors of

the condenser coil temp.

sensor(T3),outdoor

ambient temp. sensor(T4)

and discharge temp.

sensor(TP).

4) disconnect the

electronic expansion

valve wire

○1

○3

○4

○2

5) Remove the

grounding screw.

6) Remove the

Wires (1,2,3).

Then remove the

electronic control box.

○5 ○6

4 Four-way

valve

How to remove the

four-way valve.

1) Perform work of

item1,3.

2) Recover refrigerant

from the refrigerant circuit.

3) Remove the screw of

the coil and then remove

the coil.

4) Detach the welded

parts of four-way valve

and pipe.

5) Then the four-way

valve ass’y can be

removed

The picture of four-way valve may be different from

the one on your side. ○3 ○4

5 Compressor

How to remove the

compressor.

1) After perform work of

item1,3.

2) Remove the

discharge pipe and

suction pipe with a burner.

3) Remove the hex nuts

and washers fixing the

○2

compressor on bottom

plate.

4) Lift the compressor

from the base pan

assembly.

○3

MCHSU-18PHH2，

No. Part name Procedures Remarks

1 Panel plate

How to remove the panel

plate.

1) Stop operation of

the air conditioner and turn

“OFF” the power

breaker.

2) Remove the top panel(7

screws).

3) Remove the screws of

front panel(9 screws)

4) Remove the screws of

the right side panel(10

screws)

○2

○4

○3

4 screws of top panel

9 screws of front panel

3 screws of

big handle

2

Fan ass’y

How to remove the fan

ass’y.

1) After remove the Air

outlet grille, remove the

hex nut fixing the fan and

then remove the fan.

2) After remove the top

cover . Unfix the hooks

and

then open the electronic

control box cover.

○1

○2

3) Disconnect the

connector for fan motor

from the electronic control

board.

4) Remove the four fixing

screws of the fan motor.

Then remove the fan

motor.

○3

○4

T3,T4,T5 sensor wire

Motor wire

Electronic expansion valve

Compressor wire

4 way valve wire

Electric pipe heater and Crankcase electric heater

3 Electrical

parts

How to remove the

electrical parts.

1) After finish work of

item 1 and item 2, remove

the connectors for the

compressor and reactor.

2) Pull out the two blue

wires connected with the

four way valve.

3) Pull out connectors of

the condenser coil temp.

sensor(T3),outdoor

ambient temp. sensor(T4)

and discharge temp.

sensor(TP).

○1

○3

○2

4) disconnect the

electronic expansion valve

wire

5) remove the

electric heaters

6) Remove the

grounding screw.

7) Remove the

wires(1,2,3 or L1,L2,S).

Then remove the

electronic control box.

○4

5

○7

⑥

4 Four-way

valve

How to remove the

four-way valve.

1)Perform work of

item1,3.

2) Recover refrigerant

from the refrigerant circuit.

3)Remove the screw of the

coil and then remove the

coil.

4) Detach the welded parts

of four-way valve and pipe.

5)Then the four-way

valve ass’y can be

removed

The picture of four-way valve may be different from

the one on your side.

○3

5 Compressor

How to remove the

compressor.

1) After perform work of

item1,3. Recover

refrigerant from the

refrigerant circuit.

2) Remove the

discharge pipe and suction

pipe with a burner.

3) Remove the hex nuts

and washers fixing the

compressor on bottom

plate.

4) Lift the compressor

from the base pan

assembly.

○2

○3

④

MCHSU-24PHH2,MCHS-30PSH2,MCHS-36PSH2,

No. Part name Procedures Remarks

1 Panel plate

How to remove the panel

plate.

1) Stop operation of

the air conditioner and turn

“OFF” the power

breaker.

2) Remove the big handle

first,then remove the top

panel( 7screws)

3) Remove the screws of

the front panel(11 screws)

4) Remove the screws of

the right side plate and

remove the right side

plate.(12 screws)

3 screws of top panel

11 screws of front panel

4 screws

of big

handle

○2

○3

○4

2

Fan ass’y

How to remove the fan

ass’y.

1)After remove the Air

outlet grille, remove the

hex nut fixing the fan and

then remove the fan.

2) After remove the top

cover .Unfix the hooks and

screws,then open the

electronic control box

cover.

○1

○2

3) Disconnect the

connector for fan motor

from the electronic control

board.

4)Remove the four fixing

screws of the fan motor.

Then remove the fan

motor.

○3

Electric pipe heater

and Crankcase electric

Heater wire

Motor wire

Electronic expansion

Valve wire

4 way valve

T3,T4,T5 sensor wire

Compressor wire

○2

3 Electrical

parts

How to remove the

electrical parts.

1) After finish work of

item 1 and item 2, remove

the three connectors for

the compressor and the

compressor crankcase

heater and the chassis

electric heater.

2) Pull out the two blue

wires connected with the

four way valve.

3) Pull out connectors of

the condenser coil temp.

sensor(T3),outdoor

ambient temp. sensor(T4)

and discharge temp.

sensor(TP).

4)Disconnect the

electronic expansion valve

wire from the control board

○1

○2

○3

○4

○5 ○4

5) Remove the

grounding screw.

6) Remove the power

supply wires(1,2,3 or

L1,L2,S).

Then remove the

electronic control box.

○6 ○5

4 Four-way

valve

How to remove the

four-way valve.

1) Perform work of

item1,3.

2) Recover refrigerant

from the refrigerant circuit.

3) Remove the screw of

the coil and then remove

the coil.

4) Detach the welded

parts of four-way valve and

pipe.

5) Then the four-way

valve ass’y can be

removed

The picture of four-way valve may be different from

the one on your side. ○3 ○4

5 Compressor

How to remove the

compressor.

1) After perform work of

item1,3. Recover

refrigerant from the

refrigerant circuit.

2) Remove the

discharge pipe and suction

pipe with a burner.

3) Remove the hex nuts

and washers fixing the

compressor on bottom

plate.

4) Lift the compressor

from the base pan

assembly.

○2

○

3

Midea MEHS-12PSH1, MEHSU-12PHH2, MEHSU-09PHH2, MEHSU-24PHH2, MEHS-30PSH2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual