Midea MDV-D252W/CS, MDV-D, MDV-D280W/CS, MDV-D335W/CS, MDV-D450W/CS Installation Manual
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MDV[D] Series
Digital Scroll Central Air Conditioner Outdoor Unit
INSTALLATION MANUAL
Model:
MDV-D252W/CS
MDV-D280W/CS
MDV-D335W/CS
MDV-D400W/CS
MDV-D450W/CS
PRECAUTIONS
1. This installation manual is for the outdoor unit.
2. Refer to the indoor unit installation manual for indoor parts
installation.
3. Please read the power source unit installation manual to
install the power source unit .
4. Please refer to the refrigerant distributor installation
manual to install the refrigerant distributor.
KEY POINTS IN INSTALLATION
INSTALLATION
Confirm the model and name of your air conditioner
to avoid installation mistakes.
REFRIGERANT PIPING
Separately purchased refrigerant distributor (branch
joint, branch header pipe) should be used in the process
of refrigerant piping.
Refrigerant piping should accord with specified
diameter.
Charge nitrogen under certain pressure in the refrigerant
piping before welding.
Heat insulation should be done to refrigerant piping.
After the installing refrigerant piping, do not electrify the
indoor unit before the airtight test and vacuum.
AIRTIGHT TEST
Refrigerant piping must be tested for gas proof
[2.94MPa(30kg/cm ) nitrogen.]
VACUUM
Vacuum pump must be used, and vacuuming should
be done from the gas side and liquid side
simultaneously.
ADD REFRIGERANT
When the actual pipe is longer than the fiducial length,
the added refrigerant volume of every outdoor unit
depends on the calculating according to the actual length.
Fill the form on the outdoor unit electric control box with
the added volume, length of pipes (actual length) and the
relative height drop between outdoor unit and indoor unit.
WIRING
Choose power capacity and wire diameter according to
the design manual. The power cord of the air conditioner
should be wider than the power cord of ordinary motor.
Do not twist or cross the power cord with wiring (low
voltage) between indoor and outdoor unit, or mishandling
may occur.
Connect the indoor unit to the power after airtight test
and vacuuming.
Set the address of outdoor unit, see Address dial
of outdoor unit
TEST RUNNING
Remove six sponges at the back of unit. Please handle
with care to avoid damage to fin, which will decrease
heat exchanging efficiency.
The test running can not begin until the outdoor unit has
been connected to the power for 12hr.
2
INSTALLATION LOCATION
CAUTION
1. Please keep away from the following place, or
malfunction of the machine may be caused:
There is combustible gas leakage.
There is much oil (including engine oil) ingredient.
There is salty air surrounding(near the coast)
There is caustic gas (the sulfide) existing in the air (near
a hotspring).
A place the heat air expelled out from the outdoor unit
can reach your neighbor's window.
A place that the noise interferes your neighbors every
day life.
A place that is too weak to bear the weight of the unit.
Uneven place.
Insufficient ventilation place.
Near a private power station or high frequency equipment.
A place with strong electromagnetic interference.
2. The insulation of the metal parts of the building and the
air conditioner should comply with the regulation of
National Electric Standard.
ACCESSORIES
Name
Outdoor unit installation manual
Outdoor unit owner s manual
Indoor unit owner s manual
Service manual(guarantee
and bar code inside)
Screw bag
Straight screwdriver
Gauge joint
90 elbow
(Outdoor unit)
Qty.
Outline
This manual
1
1
2
1
1
1
1
2
Function
(Given to users)
(Given to users)
(Given to users)
Spare
Dialling
For airtight test
Pipe connecting
CARRY IN THE OUTDOOR UNIT
1. Carry in with steel wire:
Sling the outdoor unit and carry it in with 4 steel wire
(f6mm or more)
Use soft board to protect the unit surface from scratch
and distortion where contact the steel wire.
Remove the transportation board after carrying in the
outdoor unit.
2. Carry in with a fork lift
Steel wire
Protection board
Hole site for fork lift
Chassis
INSTALLATION SPACE
1. Leave enough space for maintenance (see following
picture) and install power unit on the side of outdoor
unit. Refer to power unit installation manual.
2. Keep the modules in one system at the same level.
(Air-out )
(Air-in )
(Air-in )
5. If through the front, please remove the clapboard
at corresponding place first.
CAUTION
To prevent the inside of piping from oxidizing
when welding, it is necessary to charge nitrogen,
or oxide may block the circulation.
OUTDOOR UNIT COMBINATION
Installation and maintenance surface
1000mm
1000mm
20mm~ 500mm
20mm~ 500mm
1000mm
1000mm
Outdoor unit planform
2. When there is obstacle above the outdoor unit:
A
B
Front view
45
A
300mm
B
1000mm
C
D
Airflow deflector
Front view
NOTE: The top of any pile around the outdoor unit should at least 800mm
below the top of unit. If not, please install mechanical air discharge equipment.
A
B
C
Side view
Front view
D
A
B
REFRIGERANT PIPE
1. Refrigerant piping connection is inside the outdoor
unit, please remove the front clapboard.
2. The piping can be led through the down-left of the
outdoor unit or the soleplate gap.
3. When through the front, piping is led by wiring from
the panel, then connect branch pipes towards left
or right.
4. When through the soleplate gap, install the branch
pipe towards left, right or back.
To liquid side pipe
To gas balance pipe
(flaring nut)
To oil balance pipe
To gas balance pipe
(welding)
To gas side pipe
NOTE: No connection
with gas and oil balance
pipes for single module.
Low-pressure
ball valve
Mode
Qty. of
indoor unit
Mode
SELECT SIZES OF REFRIGERANT PIPES
1
Pipe between outdoor unit and the first
branch (Main pipe)
Refer to table 1 for outdoor unit pipe sizes.
Size of main pipe connecting multi-modules
2
See table 2
3
Pipe between branches
See table 3
4
Pipe between branch and indoor unit
See table 4
Select branch joint
Select the joint according to the total designed
capacity of indoor units which it connects to. If this
capacity is more than that of the outdoor unit, then
select the connection according to the outdoor unit.
The selection of branch header depends on
the quantity of branches it connects to.
22
33
33
(See table 3)
22
33
33
33
PIPE SIZE AND CONNECTION
Outdoor unit
11
11
Outdoor unit
22
Outdoor unit
33
11
22
33
33
22
33 33
33
11
22 22
22
33
33 33 33
22 22 22
33 33
33
33
Qty. of
indoor unit
33
33
<Module installation chart>
Single module
Three modules
1 32HP capacity 48HP
Liquid pipe
Gas pipe
NOTE: Pipe size of model 8HP, 10HP and 12HP:
liquid side 12.7, gas side 28.6.
Pipe size of model 14HP and 16HP:
liquid side 15.9, gas side 38.0.
Gas and oil balance pipes should be sealed by welding
for single module.
Two modules
1 16HP capacity 24HP
12.7( 15.9)
28.6( 38.0)
Liquid pipe 19.0
Gas pipe 38.0
NOTE: See following chart for size of Y-shaped
pipe A on liquid side:
See following chart for size of Y-shaped
pipe B on gas side:
12.7( 15.9)
28.6( 38.0)
19.0( 22)
38.0( 45.0)
Liquid pipe 25.0
Gas pipe 54.0
NOTE: The size of Y-shaped pipes A and B on liquid
side and gas side respectively are the same
with that specified in item(1) of two modules.
Connection of oil and gas balance pipes
Oil balance pipe 6.35
Gas balance pipe 15.9(flaring nut)
Gas balance pipe 19.0(welding)
X
Y
Z
NOTE: See following chart for size T-shaped pipe X
connecting with oil pipe.
See following chart for size T-shaped pipes Y and Z
connecting with gas pipe.
Y
Four modules
3- 15.9
Z
3- 19.0
capacity
capacity
Liquid pipe
Gas pipe
NOTE: The size of Y-shaped pipes A and B on liquid
side and gas side respectively are the same
with that specified in item(1).
Connection of oil and gas balance pipes
NOTE: Wrap the valves
with wet cloth when welding,
or the valves may be
Oil balance pipe 6.35
Gas balance pipe 15.9(flaring nut)
Gas balance pipe 19.0(welding)
damaged to cause leakage.
NOTE: See following chart for size of Y-shaped
pipe C on liquid side:
See following chart for size of Y-shaped
pipe D on gas side:
Connection of oil and gas balance pipes
Oil balance pipe 6.35
Gas balance pipe 15.9(flaring nut)
Gas balance pipe 19.0(welding)
X
Y
Z
X
Y
Z
Liquid pipe 28.6
Gas pipe 67.0
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