Midea MDV-D280W/SN2 Installation Manual

Digital Scroll Central Air Conditioner

(Outdoor Unit)

Installation Manual

Model: MDV-D280W/SN
2
MDV-D560W/SN
2
MDV-D840W/SN
2
PRECAUTION
Precautions before reading the installation
manual.
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.
IMPORTANT CHECKING POINTS DURING INSTALLATION
INSTALLATION
Confirm the model and name of your air
conditioner to avoid installation mistakes.
REFRIGERANT PIPING
Separately purchased refrigerant distribu-
tor (branch connection, header branch
pipe) should be used in the process or
refrigerant piping.
Refrigerant piping should meet the specifi-
ed diameters.
Charge nitrogen under certain pressure in
the refrigerant piping before welding.
Refrigerant piping should undergo the heat
insulation process.
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
2
proof [2.94Mpa(30kg/cm ) nitrogen]
VACUUM
Vacuum pump must be used, and vacuum-
ing should be done from the gas side and
liquid side simultaneously.
ADD REFRIGERANT
When the actual pipe length is longer than
the base length,the every outdoor unit added
refrigerant volume is decided on the
calculating according to the actual length
of pipes.
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.
Never enwind or cross the power cord
(380V~) with signal wire (low voltage)
between indoor and outdoor unit, or malfunction is unavoidable.
Connect the indoor unit to the power after airtight test and vacuuming.
TEST RUNNING
The test running can not begin until the outdoor unit has been connected to the power for 12hr.
ACCESSORIES(outdoor unit)
Model MDV-D280W/S(N2)
Name
MDV-D560W/S(N2)
Outdoor unit installation manual
Outdoor unit owner s manual
Indoor unit owner s manual
Screws bag
Screw driver
CARRY IN THE OUTDOOR UNIT
1. Sling the outdoor unit and carry it in with
4 steel wire (f6mm or more)
2. Use soft board to protect the unit surface
from scratch and distortion at where contact
the steel wire.
MDV-D280W/S
MDV-D560W/S
MDV-D840W/S
MDV03I-017bW
INSTALLATION LOCATION
CAUTION:
1. Please keep away from the following
place, or malfunction of the machine
may be caused:
There is combustible gas leakage existing.
There is much oil (including engine oil)
ingredient.
There is salty air surrounding(near the
coast)
There is caustic gas (the sulfide, for exa-
mple) 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.
2. The insulation of the metal parts of the
building and the air conditioner should
comply with the regulation of National
Electric Standard.
INSTALLATION SPACE
1. Enough repairing space showing below
should be left during installation. When
install the outdoor unit, set the power
equipment at the side of the outdoor
unit, please refer to the power equipm-
ent installation manual.
2. Be sure to left enough room for installat-
ion and maintenance. (See Fig. Below)
Air-out
Air-in
Air-in
Install & Repair Surface.
1000mm or more
10mm (Facade) 10mm or more
10mm 10mm
1000mm
Or more
Or more
Outdoor unit platform
NOTE: 1. Let the obstacle above the outdoor
unit at least 2000mm away.
2. The top of any pile around the outdoor
unit should at least 400mm below the unit top.
Outline Usage
MDV-D840W/S(N2)
1
This manual
Give owner
1
Give owner
2
For maintenance
1
For the toggle switch
1
Steel wire
Soleplate
Mopboard
REFRIGERANT PIPING
1. Please remove the left-hand board first for
the connection of the refrigerant piping is ins-
ide the outdoor unit.(M6: 4; M4:1)
2. The pipe can be lead out through the down-
left corner of the front of the outdoor unit or
the soleplate gap.
3. When through out of the front, lead the pipe
out by wiring from the panel,and install the
refrigerant distributor at left or at right.
4. After through out of the soleplate, install
the refrigerant distributor at left,right or
rear direction.
5. When through out from the front, seal the so-
leplate gap with the rubber board to keep the
dust and rubbish out of the unit.
Soleplate for
piping and
(M6)
wiring
(M4)
Soleplate
CAUTION:
To prevent the refrigerant piping from oxidiz-
ing inside when welding, it is necessary to
charge nitrogen, or oxide will choke the
circulation system.
Select Sizes of Refrigerant Pipes and Materials
Select Sizes of Refrigerant Pipes
Outdoor Unit the Piping at the first
1
branch (Main piping)
Refer to table 1 for outdoor unit pipe
sizes.
Branch Piping between branches
2
Select pipe diameters according to the
table 2.
Branch Piping between indoor units
3
(Indoor piping)
Refer to table 3 for indoor unit connection
pipes.
Branch Connection Selection
Select according to the indoor units general
design capacity which it connects to.But if
the indoor units design capacity is more than
the outdoor unit design capacity, then select
branch connection according to the outdoor
unit.
Header Branch Selection.
The selection should according to the
number of branches it connects to.
Capacity of outdoor Sum Capacity of indoor
Maximum Quantity
Outdoor Unit
unit(horsepower)
of Indoor unit unit(horsepower)
10 16 5~13.5
MDV-D280W/S(N )
2
MDV-D560W/S(N ) 20 20 10~27
2
MDV-D840W/S(N )
2 30 30 15~40.5
Capacity Capacity
Capacity Rating Capacity Rating
(horsepower) (horsepower)
80type
28 type 1
90 type
36 type 1.25 3.2
1.7
45 type 112 type
56 type 2 140 type
2.5
71 type
Size and Connecting Method
Outdoor Unit
2 2 2 2 2 2 2 2 2 2 2 2
1 1
3 3 3 3 3 3 3 3 3 3 3 3 3 3
Outdoor Unit
1 1
3 3 3 3
3 3 3 3
Outdoor Unit
2 2 2 2
1 1 2 2 2 2
3 3 3 3
3 3 3 3 3 3 3 3
3 3 3 3
1. Table 1
Piping sizes and connecting method of the
outdoor unit.
Liquid Side
Models Gas Side
MDV-D280W/SN
2 f28.6(Welding) f12.7(Flaring nut)
MDV-D280W/S
MDV-D560W/SN
2
f38.0(Welding) f19.0(Flaring nut)
MDV-D560W/S
MDV-D840W/SN
2 f22.0(Welding)
f45.0(Welding)
MDV-D840W/S
2. Table 1
Select branch pipe
NAME
PIPE LOCATION NUMBER IN THE TABLE
Directly connect to the
Branch joint 3
indoor unit
No directly connect to
Header branch pipe 1,
the indoor unit
2. Table 2
Piping sizes at the branch pipe
A: the total HP of indoor units
Header branch pipe
A(HP)
(Gas side/ liquid side)
f 28.6/ f 12.7
A< 10 MDV-BY101
10< A < 20 f 38.0 / f 19.0
20<A < 30
f 45.0 / f 22.0
Note: The indoor unit must be connected with
MDV-HY1041 directly ,the further branch
connection is not allowed.
4. Table 4
Piping sizes and connecting method of the
Indoor Unit.
Gas Side Liquid Side
f19.0(Flaring nut) f9.5(Flaring nut)
Length and Drop Height Permitted of the Refrigerant piping
Permitted value
250m
10 HP
Total Pipe Length (Actual)
20 HP & 30 HP 300m
Actual Length
100m
Maximum Piping (L)
Equivalent Length
125m
Piping (farthest from the first line
40m
pipe branch) Equivalent Length
Indoor Unit-Outdoor Outdoor Unit Up 50m
Unit Drop Height Outdoor Unit Down
30m
Indoor Unit to Indoor Unit Drop Height
15m
Outdoor Unit (one or more outdoor units)
Header Branch Pipe
L L
1 2
The first Line Branch Pipe B
A C
Indoor Unit
L
3
Maximum Piping Equivalent Length L 125m
(From the first Line branch pipe) Maximum piping
Equivalent Length L 40m
L L
L
4 5 6
E
F
G
Indoor Unit
Remove Dirt or Water in the Piping
Make sure there is no any dirt or water
before connecting the piping to the outdoor
Units.
Wash the piping with high pressure nitrogen,
never use refrigerant of the outdoor unit.
Airtight Test
Charge pressured nitrogen after connecting
indoor unit/outdoor unit piping to do airtight
test.
CAUTION
1. Pressured nitrogen [2.94MPa (30kg/cm )]
should be used in the airtight test.
2. Tighten high pressure/low pressure
valves before applying pressured nitrogen.
3. Apply pressure from air vent mouth on the
high pressure/low pressure valves.
4. The high pressure/low pressure valves
are closed when applying pressured nitrogen.
5. The airtight test should never use any
oxygen, flammable gas or poisonous gas.
Air Purge with Vacuum Pump
Using vacuum pump to do the vacuum,never
using refrigerant to expel the air .
Vacuuming should be done from both liquid
side and gas side simultaneously.
Open All Valves
Refrigerant Amount to be Added
3
Calculate the added refrigerant according to the
4 diameter and the length of the liquid side
5
pipe of the outdoor unit/indoor unit connection.
Refrigerant to be Added
Liquid Side Piping
per meter piping
Diameter
f 9.5
0.065kg
f 12.7
0.115kg
3 3
f 15.9 0.190kg
0.290kg
f 19.0
0.380kg
f 22.0
Low
Pressured
Valve
High
Pressured
Valve
Connecting Connecting
signal wire power wire
Joint
Indoor Unit
& Branch pipe
2
Branch joint
MDV-HY1041
MDV-BY102
MDV-BY103
Piping
L +L +L +L +L +L +L
1 2 3 4 5 6 7
+A+b+c+d+e+f+g+h+i+j
L +L +L +L +L +j
1 3 4 5 6
L +L +L +L +j
3 4 5 6
D
H 15m
H
I
2
Terminal
Connecting
Block
Connecting
power wire