Midea Mini VRF Operating manual

3 phase, 380-415V, 50/60Hz
MDV-120W/DGN1
MDV-140W/DGN1
MDV-160W/DGN1
Model:
Technical Service Manual
Mini VRF

Contents
Part 1 General Information.......................................…1
Part 2 Outdoor Units.................................................…9
Part 3 Installation ....................................................…44
Part 4 Troubleshooting .........................................…58
Manufacture reserves the right to discontinue, or change at any time, specifications or designs without
notices and without incurring obligations.

R410AAll DC Inverter Mini VRF MCAC-VTSM-2016-02

MCAC-VTSM-2016-02 R410AAll DC Inverter Mini VRF
General Information 1
Part 1 General Information
1. Product Lineup ..................................................................................... 2
2. Nomenclature........................................................................................ 3
3. Features................................................................................................. 4
4. Indoor Units Lineup.............................................................................. 7

R410AAll DC Inverter Mini VRF MCAC-VTSM-2016-02
2 General Information
1. Product Lineup
Outdoor Units
Model name
Dimension body(mm)
Net/Gross weight (kg)
Power supply
MDV-120W/DGN1
Width:900
Height:1327
Depth:400
95/105
380-415V 3N~50/60Hz
MDV-140W/DGN1
Width:900
Height:1327
Depth:400
99/109
380-415V 3N~50/60Hz
MDV-160W/DGN1
Width:900
Height:1327
Depth:400
100/110
380-415V 3N~50/60Hz

MCAC-VTSM-2016-02 R410AAll DC Inverter Mini VRF
General Information 3
2. Nomenclature
M D V - 120 W / D G N1
*Note: the actual cooling capacity please refer to the nameplate.
Refrigerant type
N1:R410A
Power Supply
G: 380-415V 3N~50/60Hz
Inverter Type
D: DC Inverter
W: Outdoor unit
Cooling Capacity (×100W)*
Midea

R410AAll DC Inverter Mini VRF MCAC-VTSM-2016-02
4 General Information
3. Features
3.1 High efficient DC inverter compressor
At the heart of Mini VRF system is a high efficiency twin rotary compressor. It enables the outdoor output to be
modulated by the cooling or heating demands of the control area, ensures precise temperature regulation and
highly efficiency energy usage.
3.2 High performance heat exchanger
The new designed window fins enlarge the heat-exchanging area,
which decrease the air resistance, save more power and enhance heat
exchange performance.
Hydrophilic film fins and inner-threaded copper pipes optimize heat
exchange efficiency.
3.3 Newly designed air outlet grill
Optimally designed fan shape and newly designed grill ensure both safety and air volume.
New air outlet grill
Compressor
(TwinRotary) structure
Highly Efficient DC Motor:
- Creative motor core design
- High density neodymium magnet
- Concentrated type stator
-Wider operating frequency range
Better balance and Extremely Low Vibration:
- Twin eccentric cams
- 2 balance weights
Highly Stable Moving Parts:
- Optimal material matching rollers and vanes
-Optimize compressor drive technology
- Highly robust bearings
-Compact structure
2
2

MCAC-VTSM-2016-02 R410AAll DC Inverter Mini VRF
General Information 5
46°C
-15°C
COOLINGMODE
27°C
-15°C
HEATINGMODE
3.4 Wide operation temperature range
No matter in extremely cold winter when outdoor temperature gets as low as -15°C or in hot summer when
temperature is up to 46°C, the Mini VRF system will keep stable performance.
3.5 Flexible piping design
3.6 Space saving design
The Mini VRF units are slimmer and more compact, resulting in significant savings in installation space.
In some large residential and light commercial areas, such as villas, restaurants, usually it need more than one
indoor unit, which in turn requires multiple outdoor units.
Midea's Mini VRF system solves this problem, and retains buildings' original aesthetics.
The longest piping length is 70m
The first branch joint to the farthest IDUis 20m The IDUto the nearest branch joint is 15m
Level difference between IDUand ODUis 30m
Level difference between IDUs is 8m
Piping Length
Permitted Value
Total piping length (Actual)
100m
Longest piping
length
Actual
60m
Equivalent
70m
The first branch joint to the farthest IDU
20m
The IDU to the nearest branch pipe
15m
Level difference
between ODU~IDU
ODU up
30m
ODU down
20m
Level difference between IDU~IDU
8m

R410AAll DC Inverter Mini VRF MCAC-VTSM-2016-02
6 General Information
Front side
Bottom side
Back side
Right side
3.7 Auto Addressing
Outdoor unit can distribute addresses for indoor units automatically.
Wireless and wired controllers can query and modify each indoor unit's address.
3.8 More Convenient Piping Connector –Branch Box
Easier and safer installation thanks to a branch box that simplifies piping work and the adoption of screw
connection.
Both left and right pipe flare connectin from outdoor unit to branch box is reserved, which greatly simplifies field
installation.
3.9 Four-Way Piping Connection
A four-direction space is available for connecting
pipes and wiring in various installation sites.
1
2
3
4
5
6
7
8
910

MCAC-VTSM-2016-02 R410AAll DC Inverter Mini VRF
General Information 7
4. Indoor Units Lineup
Capacity
(×100W)
Cassette type
One-way cassette
Two-way cassette
Compact four-way
cassette
Four-way cassette
15
●
18
●
22
●
●
●
28
●
●
●
●
36
●
●
●
●
45
●
●
●
●
56
●
●
●
71
●
●
80
●
90
●
100
●
112
●
140
●
Capacity
(×100W)
Duct type
Low static pressure duct
Medium static pressure duct
High static pressure duct
15
●
18
●
22
●
●
28
●
●
36
●
●
45
●
●
56
●
●
71
●
●
●
80
●
●
90
●
●
100
112
●
●
140
●
●
160
●
Capacity
(×100W)
Floor-standing/Ceiling & Floor/Console
Floor standing (exposed)
Floor standing
(concealed)
Ceiling & floor
console
22
●
●
●
28
●
●
●
36
●
●
●
●
45
●
●
●
●
56
●
●
●
71
●
●
●
80
●
●
●
90
●
112
●
140
●
160
●