Midea MCA-24HRN2MCA-24CRN2 User manual

CASSETTE TYPE
Thank you very much for purchasing our air conditioner, please read this owner's
manual carefully before using your air conditioner.
INSTALLATION MANUAL
AIR CONDITIONER
MODEL:
MCA-24HRN2
MCA-24CRN2
MCA-36HRN2
MCA-36CRN2
MCA-42HRN2
MCA-42CRN2
MCA-48HRN2
MCA-48CRN2

CONTENTS PAGE
1. PRECAUTIONS................................................................................................1
2. INSTALLATION INFORMATION.. ...2
3. ATTACHED FITTINGS.... ....3
4. INSTALLATION PLACE.. ...4
5. INDOOR UNIT INSTALLATION.. ....5
6. OUTDOOR UNIT INSTALLATION.. .9
7. INSTALL THE CONNECTING PIPE.. .10
8. CONNECT THE DRAIN PIPE. .....14
9. WIRING.... .16
10. TEST OPERATION..... ....20
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PRECAUTIONS
SAFETY CONSIDERATIONS
Installation and servicing of air conditioning equipment can be hazardous due to system pressure and
electric components. Only trained and qualified service personnel should install, repair or service air
conditioning equipment.
All other operations should be performed by trained service personnel. When working on air conditio-
ning equipment, observe precautions in the literature, tags and labels attached to the unit and other
safety precautions that may apply. Follow all safety codes. Wear glasses and work gloves. Use quen-
ching cloth for brazing and unbrazing operations. There are fire extinguishers available for all brazing
operations.
WARNING
WARNING
WARNING
This manual describes the installation of specified indoor and outdoor units. Do not install them conn-
ected with any other indoor or outdoor unit .Mismatching of units and incompatibility between control
devices in the two units could lead to damage of both units .
Before performing service or maintenance operations on system, turn off main power switch of the unit.
Electrical shock could cause personal injury.
This unit shall be installed in accordance with national wiring regulations.
If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or similarly
qualified person in order to avoid a hazard.
The means for disconnection from the supply having a contact separation of at least 3 mm in all poles.
CAUTION
1. Wire the outdoor unit, then wire the indoor unit. You are not allow to connect the air conditioner with
the power source until wiring and piping the air conditioner is done.
2. For installation of the indoor unit, outdoor unit, and connection piping in between, follow the instru-
ctions given in this manual as strictly as possible.
3. Installation in the following places may cause trouble. If it is unavoidable using 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 facilities.
(6) A place of special environmental conditions.
4. Don't install this unit in the laundry.
1

Remark per EMC Directive 89/336/EEC
For to prevent flicker impressions during the start of the compressor (technical process) ,following
installation conditions do apply.
1. The power connection for the air conditioner has to be done at the main power distribution. The
distribution has to be of a low impedance, normally the required impedance reaches at a 32 A
fusing point.
2. No other equipment has to be connected with this power line.
3. For detailed installation acceptance please refer to your contract with the power supplier, if restric-
tions do apply for products like washing machines, air conditioners or electrical ovens.
4. For power details of the air conditioner refer to the rating plate of the product.
5. For any question contact your local dealer.
NOTE
INSTALLATION INFORMATION
2
1. Select the location;
2. Install the indoor unit;
3. Install the outdoor unit;
4. Install the connecting pipe ;
5. Connect the drain pipe;
6. Wiring;
7. Test operation.
To install properly, please read this "installation manual" at first.
The air conditioner must be installed by qualified persons.
When installing the indoor unit or its tubing, please follow this manual as strictly as possible.
When all the installation work is finished, please turn on the power only after a thorough check.
Regret for no further announcement if there is any change of this manual caused by product
improvement.
CAUTIONS FOR THE REMOTE CONTROLLER OPERATION
Please do not throw the remote controller or beat it.
Please use the remote controller within the allowed distance, and keep the transmitter toward the
receiver of the indoor unit.
Please keep the remote controller more than 1m away from TV or stereo set.
Never put the remote controller at the place with humid or direct sunlight, or near heaters.
Please insert the batteries properly.
INSTALLATION ORDER

Please check whether the following fittings are of full scope. If there are some attached fittings free
from use, please restore them carefully.
Installation Fittings Tubing & Fittings
1. Expansible hook..........................................4
2. Installation hook..........................................4
3. Installation paper board...............................1
4. Bolt M5 16 or M6 12.............................4
ATTACHED FITTINGS
5. Connecting pipe group...............................1
7. Soundproof / insulation sheath...................2
6. Binding tape................................................6
8. Out-let pipe sheath.......................................1
9. Out-let pipe clasp.........................................1
10. Tightening band.......................................20
11. Drain elbow.................................................1
12. Seal ring.....................................................1
13. Wall conduit..............................................1
14. Wall conduit cover....................................1
Power/Signal Wiring Group
15. Power wiring of the indoor unit.................1
16. Weak electrical wiring between
the indoor and outdoor units....................1
Drainpipe Fittings Protect Pipe Fittings
Remote controller & Its Frame
Others
21. Owner's manual.......................................1
22. Installation manual...................................1
17. Remote controller......................................1
18. Frame........................................................1
19. Mounting screw(ST2.9 10-C-H) .............2
20. Alkaline dry batteries (AM4)......................2
3
Liquid-side
tubing
MCA-42(36,48)CRN2
MCA-42(36,48)HRN2
gas-side
tubing
f9.53mm f12.7mm
f16mm f19mm
MCA-24CRN2
MCA-24HRN2

INSTALLATION PLACE
4
There is enough room for installation and maintenance.
The air outlet and the air inlet are not impeded, and can not be reached by strong wind.
It must be a dry and well ventilating place.
The support is flat and horizontal and can stand the weight of the outdoor unit. And will no additional
noise or vibration.
Your neighborhood will not feel uncomfortable with the noise or expelled air.
There is no leakage of combustible air.
It is easy to install the connecting pipe or cables.
Determine the air outlet direction where the discharged air is not blocked.
A place free of a leakage of combustible gases.
In the case that the installation place is exposed to a strong wind such as a seaside or high position,
secure the normal fan operation by putting the unit lengthwise along the wall or using a duct or shield
plates.
If possible, do not install the unit where it is exposed to direct sunlight.
If necessary, install a blind that does not interfere with the air flow.
During the heating mode, the water drained off the outdoor unit ,The condensate should be well dr-
ained away by the drain hole to an appropriate place, so as not to interfere other people or public.
Select the position where it will not be subject to snow drifts, accumulation of leaves or other seasonal
debris. It is important that the air flow for the outdoor unit is not impeded as this will result in reduction
in heating or cooling performance.
CAUTIONS
Location in the following places may cause malfunction of the machine.(If unavoidable, please consult
your local dealer)
a. There is petrolatum existing.
b. There is salty air surrounding (near the coast).
c. There is caustic gas (the sulfide, for example) existing in the air (near a hot spring).
d. The Volt vibrates violently (in the factories).
e. In buses or cabinets.
f. In kitchen where it is full of oil gas.
g. There is strong electromagnetic wave existing.
h. There are inflammable materials or gas.
i. There is acid or alkaline liquid evaporating.
j. Other special conditions.
NOTICES BEFORE INSTALLATION
1. Select the correct carry-in path.
2. Move this unit as originally packaged as possible.
3. If the air conditioner is installed on a metal part of the building, it must be electrically insulated acc-
ording to the relevant standards to electrical appliances.
1. The indoor unit
There is enough room for installation and maintenance.
The ceiling is horizontal, and its structure can endure the weight of the indoor unit.
The air outlet and the air inlet are not impeded, and the influence of external air is the least.
The air flow can reach throughout the room.
The connecting pipe and drainpipe could be extracted out easily.
There is no direct radiation from heaters.
2. The outdoor unit

INDOOR UNIT INSTALLATION
5
>1000mm
>1000mm
>1000mm
>1000mm
Chart 2
A
Drain side Tubing side
(Unit: mm)
680(Hook-location)
780(Hook-location)
840(Body)
840(Body)
880(Ceiling hole)
880(Ceiling hole)
950(Panel)
950(Panel)
1. Install the main body
A. The existing ceiling (to be horizontal)
a. Please cut a quadrangular hole of 880 880mm in the ceiling according to the shape of the installation
paper board. (Refer to Chart3, 4)
The center of the hole should be at the same position of that of the air conditioner body.
Determine the lengths and outlets of the connecting pipe, drainpipe and cables.
To balance the ceiling and to avoid vibration, please enforce the ceiling when necessary.
b. Please select the position of installation hooks according to the hook holes on the installation board.
Drill four holes of f12mm, 45~50mm deep at the selected positions on the ceiling. Then embed the
expansible hooks (fittings).
Face the concave side of the installation hooks toward the expansible hooks. Determine the length
of the installation hooks from the height of ceiling, then cut off the unnecessary part.
If the ceiling is extremely high, please determine the length of the installation hook according to facts.
Necessary room
>2500mm
outlet intlet outlet
ground
A
Chart 1
Note: MCA-24CRN2 MCA-24HRN2
MCA-42(36,48)CRN2
MCA-42(36,48)HRN2
Chart 3
A 330mm
Series A 260mm
Series

The length could be calculated from Chart5
Chart5: Length=H-181+L (in general, L=100mm and is half of the whole length of the installation hook)
c. Please adjust the hexangular nuts on the four installation hooks evenly, to ensure the balance of the
body.
If the drainpipe is awry, leakage will be caused by the malfunction of the water-level switch.
Adjust the position to ensure the gaps between the body and the four sides of ceiling are even. The
body's lower part should sink into the ceiling for 10~12 mm (Refer to chart 5).
Locate the air conditioner firmly by wrenching the nuts after having adjusted the body's position well.
A
Nut
Body
Ceiling 880mm
Hook
B
Panel
Chart 4
Note: Series B=240mm
Series B=310mm
MCA-24CRN2, MCA-24HRN2
MCA-42(36,48)CRN2, MCA-42(36,48)HRN2
Body
L
Chart 5
H (Ceiling height)
Ceiling
10-12mm
136mm
34mm
Chart 6
Bolt
Chart 7
Central hole
Bolt M6X12 Installation paper board
6

B. New built houses and ceilings
a. In the case of new built house, the hook can be embedded in advance (refer to the A.B mentioned
above). But it should be strong enough to bear the indoor unit and will not become loose because
of concrete shrinking.
b. After installing the body, please fasten the installation paper board onto the air conditioner with
bolts(M6 12) to determine in advance the sizes and positions of the hole opening on ceiling.
Please first guarantee the flatness and horizontal of ceiling when installing it.
Refer to the A.a mentioned above for others.
c. Refer to the A.c mentioned above for installation.
d. Remove the installation paper board.
2. Install The Panel
CAUTIONS
CAUTIONS
After completion of installing the body, the four bolts(M6 12)must be fastened to the air
conditioner to ensure the body is grounded well.
Never put the panel face down on floor or against the wall, or on bulgy objects.
Never crash or strike it.
(1) Remove the inlet grid.
a. Slide two grid switches toward the middle at the same time, and then pull them up. (Refer to chart 8)
0
b. Draw the grid up to an angle of about 45 , and remove it. (Refer to chart 9)
Grid switch
Chart 8
45
Chart 9 Chart 10
(2) Remove the installation covers at the four corners.
Wrench off the bolts, loose the rope of the installation covers, and remove them. (Refer to chart 10)
(3) Install the panel
a. Align the swing motor on the panel to the tubing joints of the body properly. ( Refer to chart 11)
b. Fix hooks of the panel at swing motor and its opposite sides to the hooks of corresponding water
receiver. ( Refer to chart 11 ) Then hang the other two panel hooks onto corresponding hangers of
the body. ( Refer to chart 11 )
CAUTIONS Do not coil the wiring of the swing motor into the seal sponge.
7

Chart 14
Loosen upper nut
Adjust lower nut
Gap not allowed
Chart 13
Leakage
Ceiling
Pollution Water condensation
8
Cross-screwdriver
Outlet joint
Tubing joint Hook panel
Swing Motor
Hook-boit
Water- receiver
Chart 11
panel sponge
Chart 12
body
Ceiling
panel
panel foam1 air out
tan panel foam 2
4-6mm
outlet foam
c. Adjust the four panel hook screws to keep the panel horizontal, and screw them up to the ceiling
evenly. ( Refer to chart 11 )
d. Regulate the panel in the direction of the arrow in Chart11 slightly to fit the panel's center to the
center of the ceiling's opening. Guarantee that hooks of four corners are fixed well.
e. Keep fastening the screws under the panel hooks, until the thickness of the sponge between the
body and the panel's outlet has been reduced to about 4~6mm. The edge of the panel should
contact with the ceiling well. (Refer to chart 12)
Malfunction described in Chart13 can be caused by inappropriate tightness the screw.
If the gap between the panel and ceiling still exists after fastening the screws, the height of the
indoor unit should be modified again. ( Refer to chart 14-left)
You can modify the height of the indoor unit through the openings on the panel's four corners, if the
lift of the indoor unit and the drainpipe is not influenced (refer to chart 14-right).
(4) Hang the air-in grid to the panel, then connect the lead terminator of the swing motor and that of
the control box with corresponding terminators on the body respectively.
(5) Relocate the air-in grid in the procedure of reversed order.
(6) Relocate the installation cover.
a. Fasten the rope of installation cover on the bolt of the installation cover. (Refer to chart 15-left)
b. Press the installation cover into the panel slightly. (Refer to chart 15-right)
Chart 15
,
Installation cover s rope
Tap Screw Slide the four sliders
in the corresponding
channel when installing
the cover

OUTDOOR UNIT INSTALLATION
9
(Refer to chart 17,chart 18)
If possible, please remove the obstacles nearby to prevent the performance from being impeded by too
little of air circulation.
The minimum distance between the outdoor unit and obstacles described in the installation chart does
not mean that the same is applicable to the situation of an airtight room. Leave open two of the three
directions (A,B,C)
CAUTIONS
Keep this unit away from direct radiation of the sun or other heaters.
If unavoidable, please cover it with a shelter.
In places near coast or with a high attitude where the wind is violent, please install the outdoor unit
against the wall to ensure normal performance.
Use a baffle when necessary.
In the case of extremely strong wind, please prevent the air from flowing backwards into the outdoor
unit. ( Refer to chart 16)
Locate the outdoor unit as close to the indoor unit as possible.
The minimum distance between the outdoor unit and obstacles described in the installation chart
does not mean that the same is applicable to the situation of an airtight. Leave open two of three
directions A,B,C..
X
O
Chart 16
Strong wind
NECESSARY ROOM FOR INSTALLATION AND MAINTENANCE
>30cm
>60cm
>30cm
>200cm
Chart 17
(Wall or obstacle)
Maintain channel
Air outlet
Air inlet
Air inlet
A
C
B
Chart 18
>60cm
Fix with bolt
Necessary width
Deep foundation
Since the gravity center of this unit is not at its physical center, so please be careful when lifting it
with a sling.
Never hold the air-in of the outdoor unit to prevent it from deforming.
Do not touch the fan with hands or other objects.
0
Do not lean it more than 45 , and do not lay it sidelong.
Please fasten the feet of this unit with bolts firmly to prevent it from collapsing in case of earthquake
or strong wind.
MOVING AND INSTALLING

INSTALL THE CONNECTING PIPE
10
Daub the surfaces of the flare pipe and the joint nuts with frozen oil, and wrench it for 3~4 rounds
with hands before fasten the flare nuts.(Refer to chart 19)
Be sure to use two wrenches simultaneously when you connect or disconnect the pipes.
CAUTIONS
CAUTIONS
CAUTION
Check whether the height drop between the indoor unit and outdoor unit, the length of refrige-
rant pipe, and the number of the bends meet the following requirements:
The max height drop......................................................................................................................20m
(If the height drop is more than 10m, you had better put the outdoor unit over above the indoor unit.)
The length of refrigerant pipe..........................................................................................less than 30m
The number of bends.........................................................................................................less than 15
Do not let air, dust, or other impurities fall in the pipe system during the time of installation.
The connecting pipe should not be installed until the indoor and outdoor units have been fixed already.
Keep the connecting pipe dry, and do not let moisture in during installation.
The Procedure of Connecting Pipes
1. Measure the necessary length of the connecting pipe, and make it by the following way.
(Refer to "Connect The Pipes" for details)
1) Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Do not harm to them.
Chart 19 Chart 20 Chart 21
Use frozen oil
Bend the pipe with thumb
min-radius 100mm
Make the end straight
Cut out a desired concave at the bending part of the insulating pipe.
Then expose the pipe (cover it with tapes after bending).
To prevent collapsing or deforming, please bend the pipe at its biggest radius.
Use bender to get a small radius pipes.
2) The stop value of the outdoor unit should be closed absolutely (as original state). Every time you
connect it, first loosen the nuts at the part of stop value , then connect the flare pipe immediately (in
5 minutes). If the nuts have been loosened for a long time, dusts and other impurities may enter the
pipe system and may cause malfunction later. So please expel the air out of the pipe with refrigerant
(R407C) before connection.
3) Expel the air (refer to the "Expel The Air") after connecting the refrigerant pipe with the indoor unit.
Then fasten the nuts at the repair-points.
Notices For Bendable Pipe
0
The bending angle should not exceed 90 .
Bending position is preferably in the middle of the bendable pipe. The larger the bending radius the
better it is.
Do not bend the pipe more than three times.
Bend the connecting pipe of small wall thickness ( 9.53mm)

(kg)
2. Locate The Pipes
Drill a hole in the wall (suitable just for the size of the wall conduit, 53, 71 series diameter is 90mm,
and 120,105,140 series diameter is 105 in general), then set on the fittings such as the wall
conduit and its cover.
Bind the connecting pipe and the cables together tightly with binding tapes. Do not let air in, which
will cause water leakage by condensation.
Pass the bound connecting pipe through the wall conduit from outside. Be careful of the pipe alloc-
ation to do no damage to the tubing.
3. Connect the pipes.
4. Then, open the stem of stop values of the outdoor unit to make the refrigerant pipe connec-
ting the indoor unit with the outdoor unit in fluent flow.
5. Be sure of no leakage by checking it with leak detector or soap water.
6. Cover the joint of the connecting pipe to the indoor unit with the soundproof / insulating
sheath (fittings), and bind it well with the tapes to prevent leakage.
Use the market brass pipe
Be sure to use the same insulating materials when you buy the brass pipe (more than 9mm thick).
Flaring
90 Lean crude burr
Chart 22
A
90+4
_
45+2
_
Chart 23
1. Cut a pipe with a pipe cutter.
2. Insert a flare nut into a pipe and flare
the pipe.
A(mm)
Max Min
6.35 8.3
9.53 12.4
12.7 15.8
16 19.0
19 23.3
Outside-diameter
(mm)
8.3
12.0
15.4
18.6
22.9
Fasten the nuts
Put the connecting tubing at the proper position,
wrench the nuts with hands, then fasten it with a
wrench.( Refer to Chart24)
CAUTIONS
Too large torque will harm the bellmouthing
and too small will cause leakage. Please
determine the torque according to Table 2.
f6.35 1420~1720 .
N cm . (144~176kgf cm)
f9.53 3270~3990 . N cm . (333~407kgf cm)
f12.7 4950~6030 .
N cm . (504~616kgf cm)
f166 6180~7540 . N cm . (630~770kgf cm)
f199 9720~11860 .
N cm . (990~1210kgfcm )
Tubing Size Torque
Table 2
11
Chart 24

( Refer to Chart 25)
(please refer to its manual for the way of using manifold value)
1. Loosen and remove the maintenance nuts of stop values A and B, and connect the charge hose of
the manifold value with the maintenance terminator of stop value A. (Be sure that stop values A and
B are both closed)
2. Connect the joint of the charge hose with the vacuum pump.
3. Open the Lo-lever of the manifold value completely.
4. Turn on the vacuum pump. At the beginning of pumping, loosen the maintenance terminator nut of
stop value B a little to check whether the air comes in (the sound of the pump changes, and the
indicator of compound meter turns below zero). Then fasten the nut.
5. When the pumping has finished, close the Lo-lever of the manifold value completely and turn off the
vacuum pump.
When you have pumped for over 15 minutes, please confirm that the indicator of multi-meter is on
-5
1.0 10 Pa(-76cmHg).
6. Loosen and remove the quadrangle cover of stop values A and B to open stop value A and B com-
pletely, then fasten them.
12
Capacity
LENGTH(L)
Less than 8m (one-way)
Added Refrigerant When Over 8m(one-way)
Table 3
Please record and reserve well the refrigerant stow capacity of your air conditioner for later maintenance.
MCA-24CRN2
MCA-24HRN2
MCA-42(36,48)CRN2
MCA-42(36,48)HRN2
0.065 (L-8)
Necessary Refrigerant Stow Capacity
Expel the air with a vacuum pump

7. Disassemble the charge hose from the repair-mouth of stop value A, and fasten the nut.
-76 cmHg
Lo-lever Hi-lever
Charge hose Charge hose
Vacuum pump
Lo-lever
Manifold valve
Multi-meter Pressure meter
NOTE: in the chart
A...........Lo-stop value
B...........Hi-stop value
C,D.......Joints of the connecting pipe
to the indoor unit.
CAUTIONS
All the stop values should be opened before test operation. Each air conditioner has two stop values
of different sizes on the side of the outdoor unit which operate as Lo-stop value and Hi-stop value,
respectively. (Refer to Chart 26)
Chart 27
CHECK THE LEAKAGE
INSULATION
Check all the joints with the leak detector or soap water. (refer to Chart 29)
13
Be sure to with insulating materials cover all the exposed parts of the flare pipe joints and refriger-
ant pipe on the liquid-side and the gas-side. Ensure that there is no gap between them.
Incomplete insulation may cause water condensation.
Check-point of indoor unit
Check-point of outdoor unit
D
B
C
A
Flare nut
Stopper
Cap
Valve body
Valve stern
Chart 26

CONNECT THE DRAIN PIPE
14
1-1.5 m
a
b
>1.5m
c
Lean over 1/50
Constrict here
Drainpipe
Linking pipe
Chart 28
>200mm >1-1.5 m
>200mm
Lean over 1/50
Chart 29
Note:
MCA-24CRN2, MCA-24HRN2 Serie C=200mm
Series C=212mmMCA-42(36,48)CRN2, MCA-42(36,48)HRN2
Pump-pipe clasp
(the fittings)
1. Install the drainpipe of the indoor unit
You can use a polyethylene tube as the drainpipe (out-dia.37-39mm, in-dia.32mm). It could be
bought at local market or from your dealer.
Set the mouth of the drainpipe onto the root of the body's pump-pipe, and clip the drainpipe and the
out-let pipe sheath (fittings) together firmly with the out-let pipe clasp (fitting).
CAUTIONS: Use your strength carefully to prevent the pump-pipe from breaking.
The body's pump pipe and the drainpipe (especially the indoor part) should be covered evenly with
the out-let pipe sheath (fittings) and be bound tightly with the constrictor to prevent condensation
caused by entered air.
To prevent water from flowing backwards into the air conditioner while the air conditioner stops,
please lean the drainpipe down toward outdoor (outlet-side) at a degree of over 1/ 50. And please
avoid any bulge or water deposit.( Refer to Chart 28.a)
Do not drag the drainpipe violently when connecting to prevent the body from being pulled. Mean-
while, one support-point should be set every 1~1.5m to prevent the drainpipe from yielding (Refer
to Chart 28.b). Or you can tie the drainpipe with the connecting pipe to fix it.(Refer to Chart 28.c)
In the case of prolonged drainpipe, you had better tighten its indoor part with a protection tube to
prevent it from loosing.
If the outlet of the drainpipe is higher than the body's pump joint, the pipe should be arranged as
vertically as possible. And the lift distance must be less than 200mm, otherwise the water will
overflow when the air conditioner stops.( Refer to Chart 29)
The end of the drainpipe should be over 50mm higher than the ground or the bottom of the drainage
chute, and do not immerse it in water. If you discharge the water directly into sewage, be sure to
make a U-form aquaseal by bending the pipe up to prevent the smelly gas entering the house
through the drain pipe.
C

15
2. Drainage test
Check whether the drainpipe is unhindered
New built house should have this test done before paving the ceiling.
1) Remove the test cover, and stow water of about 2000ml to the water receiver through the stow
tube. ( Refer to Chart 30)
Pump joint
Test mouth
Body
Water-receiver
Test cover
Stow tube
Drain plug
Chart 30
3. Drain Elbow Installation (Cooling Only Type Without)
Fit the seal into the drain elbow, then insert the drain elbow into the base pan hole of outdoor, rotate
0
90 to securely assemble them. Connect the drain elbow with an extension drain hose (Locally
purchased), in case of the condensate draining off the outdoor unit during the heating mode.
2) Turn on the power, and operate the air conditioner under the "COOLING" mode. Listen to the
sound of the drain pump. Check whether the water is discharger well (a lag of 1min is allowed
before discharging, according to the length of the drain pipe), and check whether water leaks
from the joints.
CAUTIONS: If there is any malfunction, please resolve it immediately.
3) Stop the air conditioner, turn off the power, and reset the test cover to its original position.
The drain plug is used to empty the water-receiver for maintenance of the air conditioner. Please
stuff it imposition at all times during operation to avoid leakage.
Chart 31
Seal The base pan hole
of outdoor unit
Drain elbow
Seal
The base pan
of outdoor unit
Drain
elbow

WIRING
CAUTION
1. The Specification of Power
TYPE
POWER
PHASE 1-PHASE 3-PHASE
CIRCUIT BREAKER/FUSE (A)
1. The air conditioner should use separate power supply with rated voltage.
2. The external power supply to the air conditioner should have ground wiring, which is linked to the
ground wiring of the indoor and outdoor unit.
3. The wiring work should be done by qualified persons according to circuit drawing.
4. A disconnection device having an air gap contact separation in all active conductors should
incorporated in the fixed wiring according to the National wiring regulation.
5. Be sure to locate the power wiring and the signal wring well to avoid cross-disturbance and their
contact with connecting pipe or stop value body.
6. The wiring attached to this air conditioner is 6m long. Be sure to prolong it with wiring of the same
type and proper length if necessary. Generally, do not twist two wiring together unless the joint is
soldered well and covered with insulator tape.
7. Do not turn on the power until you have checked carefully after wiring.
40/25
1.0
2.5
2.5
2.5
20/13
1.0
2.5
2.5
2.5
2. Remove the protection board.
Disassemble the bolts from the maintenance board, and pull it in the direction of the arrow to remove
the protection board.
Notice: Do not scratch the surface during operation.
Chart 32
Protection board
Terminator
ATTENTION: Chart 32 is based on the standard model, which may look a little different from your
own outdoor unit.
16
VOLT (V)
GROUND WIRING
POWER (INDOOR/OUTDOOR
CONNECTING WIRING)
STRONG ELEC-TRIC SIGNAL
(INDOOR/OUTDOOR
CONNECTING WIRING)
50Hz 50Hz
FREQUENCY (Hz)
220-240V~ 380V 3N~
WIRING
SIZE
2
(mm )
POWER WRING (INDOOR UNIT)
MCA-24CRN2
MCA-24HRN2
MCA-42(36,48)CRN2
MCA-42(36,48)HRN2

2. Wiring chart
Power
Switch/Fuse
Power linking wiring (indoor)
Strong elec-signal link wiring
Weak elec-signal link wiring
Indoor
Unit Outdoor
Unit
Chart 33
17
Chart 34
Note: The cooling only type without the link listed by broken line.
MCA-24CRN2, MCA-24HRN2 air conditioner link-circuit
1
OUTDOOR UNIT
INDOOR UNIT
N
L1 L 1 N 3 4 5 N
3-core cable
3-core cable
220~240VAC 50Hz
(3-core cable
2
3x2.5mm)
2
3x1mm
2
3x2.5mm
N1
3 4 5
3-core AWG24
Please ground air conditioner well. Otherwise, an important grounding may affect anti-jamming
performance of whole unit

18
Chart 35
Power
380V~
50Hz
5-core Cable
2
H07RN 5x2.5mm
5-core Cable
2
H07RN 5x2.5mm
2
1. H07RN 4X1.0mm
1. Cooling/Heating type
2
2. H07RN 3X1.0mm
2. Cooling only type
INDOOR UNIT
123456
1234
ABCN
C1 C B A N
Outdoor unit
NOTE: The cooling only type without the links listed by broken line.
MCA-42(36,48)CRN2
MCA-42(36,48)HRN2
3-core AWG24
air conditioner link-circuit