Midea MFE-60ARN1-RB4W User manual

EFEU-A-1312
SERVICE MANUAL
MIDEA AIRCONDITIONER
FLOOR STANDING TYPE
Model:
MFE-60ARN1-RB4W
MFE-60AMN1-RB4W
Code
Factory model
Model
Power supply
2T0043800005
CE-KFR160LW/SDN1Y-E(B4)
MFE-60AMN1-RB4W
3Ph, 380-420V～, 50Hz
2T0043800026
CE-KFR160LW/SDN1Y-E(B4)-W[J]
MFE-60ARN1-RB4W
3Ph, 380-420V～, 50Hz
2T0043800036
EU-KFR150LW/SDN1Y-E(B4)-W
MFE-60ARN1-RB4W
3Ph, 380-420V～, 50Hz

CONTENTS
1. Safety Precautions.................................................................................................................... 1
1.1 Precaution.................................................................................................................................................... 1
1.2 Installation.................................................................................................................................................... 1
1.3 Caution.......................................................................................................................................................... 1
1.4 Operational................................................................................................................................................... 2
2. Dimension.................................................................................................................................. 3
2.1 Indoor Unit..................................................................................................................................................... 3
2.2 Outdoor Unit.................................................................................................................................................. 4
3. Refrigerant cycle diagram........................................................................................................ 5
4. Wiring diagram.......................................................................................................................... 6
4.1MFE-60AMN1-RB4W.................................................................................................................................. 6
4.2MFE-60ARN1-RB4W(2T0043800026).................................................................................................... 7
4.3MFE-60ARN1-RB4W(2T0043800036).................................................................................................... 8
5. Installation details..................................................................................................................... 9
5.1 Installation place.......................................................................................................................................... 9
5.2 Installing.......................................................................................................................................................10
5.3 Refrigerant pipe connection....................................................................................................................13
5.4 Drain pipe of the indoor unit....................................................................................................................26
5.5 Wiring............................................................................................................................................................27
5.6 Test run.........................................................................................................................................................27
6. External view and display...................................................................................................... 28
6.1 Parts names................................................................................................................................................28
6.2 Control panel...............................................................................................................................................29
6.3 LED...............................................................................................................................................................30

7. Operation characteristics ...................................................................................................... 31
8. Electronic function ................................................................................................................. 32
8.1Main data introduction...............................................................................................................................32
8.2Main Protection...........................................................................................................................................32
8.3Operation modes and functions..............................................................................................................33
8.4Other functions............................................................................................................................................40
9. Trouble shooting..................................................................................................................... 40
9.1Self-diagnosis.......................................................................................................................... 40
9.2LEDs for the indication of outdoor trouble .............................................................................. 41
9.3Troubles and solutions............................................................................................................ 42

1
1. Safety Precautions
1.1 Precaution
To prevent injury to the user or other people and property damage, the following instruction
s must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
1.2 Installation
For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized servic
e center.
Do not disassemble or repair the product by yourself.
Sharp edges could cause injury, be especially careful of the case edges and the fins on th
e condenser and evaporator.
Be sure the installation area does not deteriorate with age.
Take care to ensure that power cable could not be pulled out or damaged during operatio
n.
Do not place anything on the power cable.
Do not plug or unplug the power supply plug during operation.
Do not store or use flammable gas or combustible near the product.
When flammable gas leaks, turn off the gas and open a window for ventilation before turn
the product on.
If strange sounds, or small or smoke comes from product. Turn the breaker off or disconne
ct the power supply cable as soon as possible.
When the product is soaked (flooded or submerged), contact an Authorized service center.
Be caution that water could not enter the product.
Turn the main power off when cleaning or maintaining the product.
When the product is not be used for a long time, disconnect the power supply plug or turn
off the breaker.
1.3 Caution
Always check for gas (refrigerant) leakage after installation or repair of product.
Install the drain hose to ensure that water is drained away properly.
Keep level even when installing the product.
Do not install the product where the noise or hot air from the outdoor unit could damage t
he neighborhoods.
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.

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1.4 Operational
Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draf
t).
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.
Do not block the inlet or outlet of air flow.
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
Do not touch the metal parts of the product when removing the air filter. They are very sh
arp.
Do not step on pr put anything on the product. (outdoor units)
Always insert the filter securely. Clean the filter every two weeks or more often if necessar
y.
Do not insert hands or other object 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.

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2. Dimension
2.1 Indoor Unit
Dimension
Mode
W
(mm) D (mm) H (mm)
55K 600 358 1900

4
2.2 Outdoor Unit
Dimension
Model
W
(mm)
D
(mm)
H
(mm)
W1
(mm)
A
(mm)
B
(mm)
MOI-60H-RB4W
940
360
1245
1020
602
380
MOU-60HN1-RB4W
(2T0043800026)
900
350
1170
985
590
378
MOU-60HN1-RB4W
(2T0043800036)
938
633.5
404
448
370
392

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3. Refrigerant cycle diagram
MOI-60H-RB4W MOU-60HN1-RB4W(2T0043800036)
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
Accumulator
T5 Discharge temp. sensor
INDOOR OUTDOOR
Low pressure
switch
High pressure switch
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
For MOI-60H-RB4W, there is no low pressure switch.
MOU-60HN1-RB4W(2T0043800026)
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
Oil return Capillary
Oil separator
Low pressure
switch
High pressure switch
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE

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4. Wiring diagram
4.1MFE-60AMN1-RB4W
Indoor Unit
Outdoor Unit

7
4.2MFE-60ARN1-RB4W(2T0043800026)
Indoor Unit
Outdoor Unit

8
4.3MFE-60ARN1-RB4W(2T0043800036)
Indoor Unit
Outdoor Unit

9
5. Installation details
5.1 Installation place
5.1.1 Indoor Unit
a.Ensure the spaces indicated by arrows from the wall, ceiling, fence or other obstacles.
b.There should not be any heat source or steam near the unit.
c.There should not be any obstacles blocking the air circulation.
d.A place where air circulation in the room is good.
e.A place where drainage can be easily done.
f.Do not install the unit near the door way.
g.There should not be any direct sunlight. Otherwise, the sun will fade the plastic
cabinet and affect its appearance. If unavoidable, sunlight prevention should be taken into
consideration.
5.1.1.1 Please stand the unit in hard and flat ground;
Please reserve space for installation and maintenance.
5.1.2 Outdoor Unit
The outdoor unit should be put in a position that guarantees the minimum space for
sufficient air circulation and to allow maintenance work and the connections of electrical
and refrigerant circuit lines. It may be installed on a floor or flat roof or wall-mounted,
provided its weight is properly supported and there is no transmission of vibration to the
adjacent rooms.
5.1.2.1 Before installing the outdoor unit, you should:
a).If an awning is built over the unit to prevent direct sunlight or rain, be careful that heat
radiation from the condenser is not obstructed.
b).Select a place that is easy to connect indoor unit's pipe and electric wires.
c).Avoid a place where combustible gas may leak or stay.
d).Keep it in mind that water may drain out of the outdoor unit while in "Heat" mode.
e).Ensure the space around the back and sides and the front of the unit.
f).Take the air conditioner weight into account and select a place where noise and
vibration are minimum.
5.1.2.2 If the outdoor unit is to be installed on a roof or where no constructions are around,
you should avoid hard wind blows directly to the air outlet, because

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it may cause trouble for air-flow shortage.
5.1.2.3 Reserve enough space for installation, maintenance and unit-functioning.
Remove as many obstacles as possible nearby.
Caution:
Installation in the following places may cause trouble. If it is unavoidable to use in such
places,please consult with the dealer.
(1) A place full of machine oil.
(2)A saline place such as coast.
(3) Hot-spring resort.
(4)A place full of sulfide gas.
(5) A place where there are high frequency machines such as wireless installation,
welding machine, medical facility.
(6) A place of special environmental conditions.
5.2 Installing
5.2.1 Indoor Unit:
1. Anti-falling;
To prevent the indoor unit from falling, you must:
a. Pay full attention to the unit because its long outer shape makes it easy to fall;
b. Firmly fix the unit to the wall or in the ground to avoid accidental falling.

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2. Dismounting the air-inlet grid
Please take off the air-inlet grid before connecting the pipes/wires.
Pull down the two knobs marked "PULL" on the grid, take off the two straps,
then the air-inlet grid goes free.
3. Take the Pipe Clip off before connecting the pipes and wiring; fit it when these finished.
Use accessories to connect the pipes/wires on both sides and back side.

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5.2.2 Outdoor Unit:
1. Ship the a/c to the installation place originally packed;
2. Be careful while hanging the unit because the center of gravity of the unit is not
centralized;
3. Do not make the angle of inclination more than 45 degrees while shipping;(Avoid
horizontal storage)
4. Be sure the electric insulation work is well done if installed on metal ceiling / wall.
5. Fix the unit feet with bolts (M10). Be sure the unit is fixed strongly enough to against
blast or earthquake.
6. Make a concrete basement to the unit by the above references.

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For the value ofA and B, please refer to the dimension part.
5.3 Refrigerant pipe connection
5.3.1 Pipe length and the elevation
The correct refrigerant quantity filled in the 5-meter-long pipe of the outdoor unit is
marked on the Product Data Plate. If you have to use longer pipe for every meter
plus pipe, the refrigerant should be added according to the following calculation.
Capacity
Btu/h
Pipe size
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas
Liquid
60K
3/4’’
(Ф19)
1/2’’
(Ф12.7)
5
20
30
60
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be installed per 5-7 meters.

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5.3.2 Piping connection
5.3.2.1 Connecting Of Refrigerant Pipe
a) Only the correctly installing of indoor and outdoor unit done, can the refrigerant
pipe be connected.
b) The cut-off valves are completely close before ex-work. Before connecting the
refrigerant pipe, be careful to check whether the valves are completely close.
c) The connecting procedure of refrigerant pipe: first, unscrew the two valves on the
outdoor unit and the pipe-jointing nut on the indoor unit(please keep them
carefully). Please connect the refrigerant pipe according to the manual, the
pipe-jointing nut should be screw tightly and no leakage. Note: you need two
wrenches to make balance.
d) When the connecting of refrigerant pipe is finished, before power on the system,
you should vacuum the indoor unit through the maintenance port on the cut-off
valves, or open the high-pressure valve, and exhaust the air through the
maintenance port on the low-pressure valve(closed). It will take about ten
seconds. Then screw tightly the maintenance port. (When supplement the
refrigerant, fill through the maintenance port of the low-pressure valves on the
outdoor unit).
e) Open all the valves completely before power on the system, or it will be sick for
low efficiency.
f) Gas leak check. Make sure no gas from connections with leak detector or soap
water.
5.3.2.2 Pipe Connecting Procedures
Completely shut the cut-off valves of the outdoor unit (as ex-work status). Unscrew the
nuts on the cut-off valves and immediately connect the reamer joint (in 5 minutes). If it last
too long, dust, vapor and other obstacles may enter the pipe and cause trouble later on.
Before connecting the pipe, the air in the pipe should be removed in advance by releasing
refrigerant R-410A.
Notes for the bendable pipe
a. The bendable pipe should be used on the indoor side;
b. Bend angel may not exceed 90 degrees;
c. The bend location should be made on the center of the pipe if possible, as for bend
radius, the bigger the better;

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d. The bendable pipe may not be bent for more than 3 times.
Bend the thin pipe
a. While bending, expose the pipe by cutting the concave gap on the bending
heat-insulation pipe(roll it with soft band after bent).
b. To avoid pipe deformation, the radius is the bigger the better.
c. Use a pipe-bending device to make the compact bending pipe.
5.3.2.3 Using bronze pipe selling in market
Completely shut the cut-off valves of the outdoor unit (as ex-work status). After t
he refrigerant pipe has been connected with both the indoor and outdoor unit, let th
e air exhaust out from the maintenance gap on he low-pressure cut-off valves of
the outdoor unit. Screw the nuts tightly on the maintenance gap after the air has
been drained.
5.3.2.4 To make the refrigerant pipe unblocked completely
You should keep the cut-off valves of the outdoor unit completely open after you
have finished the above steps (5.3.2.2 or 5.3.2.3)
Note:
1.Before screwing the reamer nut, smear the pipe and the connecting surface with r
efrigerant oil;
2.Check and make sure there is no leakage by soap-water or leakage-checker after
connecting;
3.Be sure the connecting joint on the indoor side is insulated.
4.Use two wrenches to connecting the pipes.

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Outside diameter
Torque
Additional
tightening
torque
mm
inch
N.cm
N.cm
Ф12.7
1/2
4950
6030
Ф19
3/4
9720
11860
5.3.3 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.

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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.
If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes
more. If the pressure can’t achieve -0.1Mpa 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
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-0.1MPa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve