Midea SMK-D140HHN1-3 User manual

High Temperature Hydro Module
SMK -D140HHN1-3
Engineering Data
Commercial Air Conditioners
R410A

High Temperature Hydro Module
202003 1
Engineering Data
CONTENTS
1 External Appearance.................................................................................. 3
2 Nomenclature............................................................................................ 3
3 System Schematic ...................................................................................... 4
4 Specifications............................................................................................. 5
5 BOM .......................................................................................................... 6
6 Dimensions................................................................................................ 8
7 Unit Installation ....................................................................................... 15
8 Application Examples............................................................................... 29
9 Pump Model Selection............................................................................. 42
10 Selection of Expansion Tank Volume and Preset Pressure ...................... 43
11 Final Check and Test Run........................................................................ 44
12 Piping Design ......................................................................................... 45
13 Wiring Diagram ...................................................................................... 46
14 Sound Levels .......................................................................................... 47
15 Accessories ............................................................................................ 49

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Midea VR High Temperature Hydraulic Module

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Engineering Data
1External Appearance
Figure 1.1: Appearance
2Nomenclature
Refrigerant
N3: R410A & R134A
Power Supply: 220-240 V – 50 Hz/60 Hz
High Temperature Type
Capacity index
The capacity in kW multiplied by 10
Used for VRF System
Midea hydraulic box
SMK
-
140
H
N1-3
H
D

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Midea VR High Temperature Hydraulic Module
3System Schematic
The following picture shows a schematic diagram using the High Temperature Hydraulic module and the VR system. The below
picture shows a detailed schematic of the VR system using high temperature hydraulic module.
Figure 3.1: Hydraulic box connection method

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Engineering Data
4Specifications
SMK-D140 HHN1-3
Power supply
1P~ 220-240V 50/60Hz
Heating Capacity
7/6℃OAT WIT: 40 / WOT: 45 ºC
kW
14
Working range heating
HEAT
/
-20℃~30℃
DHW
/
-20℃~43℃
ambient temperature range
/
/
0℃~40℃
sound pressure level
/
dB
43
water flow rate
nominal
m³/h
2.4
min
m³/h
1.2
max
m³/h
2.9
allowable water pressure
min
MPa
0.1
max
MPa
1.0
Unit dimensions
Height
mm
795
Width
mm
450
Depth
mm
300
Refrigerant pipes connection
Connection type
External Screw Thread
Liquid pipe diameter
mm
Ø 9.52
Gas pipe diameter
mm
Ø 12.7
water pipes connection
Connection type
External Screw Threads
Inlet pipe diameter
mm
25
Outlet pipe diameter
mm
25

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Midea VR High Temperature Hydraulic Module
5BOM

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Engineering Data
1
Front panel assembly
2
Electric control box cover assembly
3
Connecting plate
4
Pearl cotton
5
Chassis assembly
6
Pressure pipe clamp
7
Right panel assembly
8
Rubber washer
9
Connecting plate
10
Cable gland
11
Connecting plate
12
Grill
13
Dust plug
14
AC fan
15
Connecting plate
16
Drainage pipe adapter
17
Rear panel assembly
18
Connecting plate assembly
19
Flow Switch (RoHS)
20
Plate heat exchanger assembly
20.1
Plate heat exchanger assembly
21
Plate heat exchanger assembly
21.1
Plate heat exchanger assembly
22
Air discharge pipe assembly
22.1
Pressure switch
23
Top cover assembly
24
DC Inverter rotary compressor
25
Left panel assembly
26
Handle
27
E-part box assembly
27.1
Power drive mounting plate assembly
27.2
Hydraulic module, Main control board assembly
27.3
Wire joint
28
Accessory package
28.1
Connecting pipe assembly
28.2
Y shape filter
28.3
Accessory- Drainage hose
28.4
Wired controller
28.5
Magnetic ring
29
Water temperature sensor
30
Water temperature sensor
31
Pipe Temperature Sensor
32
Pipe Temperature Sensor
33
Pipe Temperature Sensor

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6Dimensions
6.1 Structural Dimensions
795
779
300
525
485
450
165
Hydro module unit (top view)

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Engineering Data
6.2 Center of gravity
105
155
165
795
105
165
300
200
450
525
200

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Midea VR High Temperature Hydraulic Module
6.3 Installation Space
A
High Temperature Hydraulic module
B
Space for installing piping (on the right side)
C
Space for installation and maintenance (in the front)

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Engineering Data
6.4 General Precautions about Installation Site
Select an installation site that meets the following conditions:
The floor that supports unit weight should be hard enough. The floor should be level to avoid vibration and noise.
The space around the unit should be wide enough for maintenance and repair. The space dimensions are as
follows: a ≥ 400 mm; b ≥ 300 mm; c ≥ 600 mm. If double-layer installation is required, the upper and lower space
between units should be not less than 150 mm.
There should be enough space around the unit for ventilation.
If flammable gas leaks, ensure that there are no hazards that could lead to fire.
This unit is not designed to operate in an environment where explosions could occur.
Select the installation site according to the corresponding legal provisions. The noise should not affect any person.
Carefully select an installation site. Do not install the unit in an environment that is sensitive to sound, such as
living rooms and bedrooms.
If water leaks, the leakage should not cause damage to the installation site or the surroundings.
Take enough measures according to the corresponding legal provisions to deal with refrigerant leakage.
When the unit is installed in a small room, take measures to ensure that concentration of the leaking refrigerant
cannot exceed the allowed limit.
Do not climb, sit on, or stand on the unit.
Do not place any article or equipment on the top of the unit (top panel of the unit).
Do not install the unit in a workshop, for example, a construction site, because at construction sites, the
equipment will be covered in dust.
Do not install the unit in a highly damp site, such as a restroom. (The maximum relative humidity is 85%.)
When installing the unit, reserve enough space for the air inlet and air outlet. Do not obstruct them.
Caution
In an airtight space, excessively high concentration of the refrigerant may lead to insufficient oxygen.
Notes for installers and service engineers


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6.5 General precautions about the Water System
Check the following items before continuing installation:
Max. hydraulic pressure: 10 bar
Max. water temperature: 80 °C
Install enough safety devices in the water loops to ensure that the hydraulic pressure does not exceed the
maximum operating pressure (10 bar).
Provide a drainage hole at all the low points of the system so that the water is completely drained from the water
system when you repair or maintain the unit. A drain valve has been installed at the water inlet to facilitate water
discharge from the unit's water system.
Ensure that you have provided a suitable water discharge pipe to the safety valve to prevent water from coming
into contact with any electrical part. A water discharge pipe has been provided with the unit.
You must deploy air outlets at all the high points of the system. The air outlets should be deployed at the places
where they can be easily maintained. A drain valve has been installed at the water outlet to facilitate air discharge
from the unit's water system.
Ensure that all the components installed on pipes on site can bear water pressure and water temperature.
You should use materials that are compatible with water and equipment in the system.
Anti-freezing protection of the water system:
Freezing may cause damage to the system. The ODU may be exposed to temperatures below 0 C. You must
prevent the system from freezing.
All the internal water systems are insulated to prevent heat loss. On site, pipes should be fitted with insulating
materials.
The unit is designed with an anti-freezing function. The unit uses a heat pump to prevent the entire system from
freezing. When the water temperature in the system decreases to a certain value, the unit will heat water. The
anti-freezing function will be disabled only when the water temperature rises to a certain value.
In the event of power failure, the anti-freezing function cannot protect the unit from freezing.
Using anti-freezing liquid in the water system is recommended, because power failure may happen when no one
is present.
Ensure that the water system is full of the ethylene glycol concentration provided in the following table, according
to the expected lowest outdoor temperature. When ethylene glycol is added to the system, device performance
will be affected. The following table lists the correction coefficients of the unit capacity, flow, and pressure drop
of the system.
Ethylene Glycol
Quality of
Glycol %
Modification Coefficient
Freezing Point
in degree C
Cooling
Capacity
Modification
Power
Modification
Water
Resistance
Water Flow
Modification
0
1.000
1.000
1.000
1.000
0.0000
10
0.984
0.998
1.118
1.019
-4.000
20
0.973
0.995
1.268
1.051
-9.000
30
0.965
0.992
1.482
1.092
-16.000
40
0.960
0.989
1.791
1.145
-23.000
50
0.950
0.983
2.100
1.200
-37.000

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Engineering Data
Propylene Glycol
Quality of
Glycol %
Modification Coefficient
Freezing Point
in degree C
Cooling
Capacity
Modification
Power
Modification
Water
Resistance
Water Flow
Modification
0
1.000
1.000
1.000
1.000
0.0000
10
0.976
0.996
1.071
1.000
-3.000
20
0.961
0.992
1.189
1.016
-7.000
30
0.948
0.988
1.380
1.034
-13.000
40
0.938
0.984
1.728
1.078
-22.000
50
0.925
0.975
2.150
1.125
-35.000
If ethylene glycol is not added, water must be discharged when power is cut off
6.6 Checking, Handling and Unpacking the Unit
When the unit is delivered, you must check the equipment and immediately report damage (if any) to the claims
agent of the carrier.
Put the packaged unit as close as possible to its final installation site to prevent damage during the handling process.
Check all the accessories of the IDU. (For details, see “1. Accessories” on page 1.)
Caution

Remove the plastic packaging bag so that children cannot play with it. Children may face the danger of death
by suffocation if playing with the plastic packaging bag.

Both ethylene glycol and propylene glycol are toxic substances. The concentration mentioned in the preceding
table cannot prevent freezing, but can prevent breaking caused by liquid pressure.
Notes for installers and service engineers


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6.7 Installation Diagram
○
DLiquid pipe (connected to the ODU)
○
EGas pipe (connected to the ODU)
○
FWater discharge pipe (drainage pan)
○
GY-shaped filter
○
HAccess hole (for charging/discharging refrigerant)
○
IWater discharge pipe (safety valve)
○
JSafety valve
○
KDischarge valve ○ MWater inlet
○
LDrain valve ○ NWater outlet
K
J
I
H
G
FED
K
N
M
GL
D
E
F
H
M
N
32 130
80
42
80
135
218 348
192
248

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Engineering Data
7 Unit Installation
To check the interior of the unit, open the top panel, front panel, and rear panel first. After you open these three panels,
you can see the main parts of the unit. If you just install or maintain the internal parts of the electric control box, you
need to open the front panel without needing to open the top or rear panel.
1 Top panel
2 Front panel
3 Rear panel
To open the electric control box and operate the interior of the electric control box, open the electric control box cover plate.
To open the electric control box, you can open the front panel without needing to open the top or rear panel.
Caution
The unit should be installed by professional installation operators. Material selection and installation must confirm
with the local legal provisions.
Notes for installers and service engineers


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Midea VR High Temperature Hydraulic Module
Main parts of the unit
1
Compressor
9
Access hole
2
Discharge temperature sensor
10
Water inlet temperature sensor
3
Plate heat exchanger used by the condenser
11
Liquid pipe temperature sensor at the outlet on the R410A
refrigerant side
4
Low pressure sensor
12
Electronic expansion valve on the R410A loop
5
High pressure sensor
13
High pressure switch
6
Water flow switch
14
Electronic expansion valve on the R134a loop
7
Water outlet temperature sensor
15
Suction temperature sensor
8
Plate heat exchanger used by the evaporator
16
Cold outlet temperature sensor on the R134a refrigerant side

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Engineering Data
1
Compressor
10
Water inlet temperature sensor
2
Plate heat exchanger used by the condenser
11
Water outlet temperature sensor
3
Electronic expansion valve on the R134a loop
12
Water flow switch
4
Plate heat exchanger used by the evaporator
13
High pressure sensor
5
Electronic expansion valve on the R410A loop
14
Low pressure sensor
6
Discharge temperature sensor
15
High pressure switch
7
Suction temperature sensor
16
Filter
8
Cold outlet temperature sensor on the R134a refrigerant
side
17
Access hole
9
Liquid pipe temperature sensor at the outlet on the R410A
refrigerant side
Connecting pipes on the refrigerant side and water system side
Use screw thread to connect the pipe on the water system side. Tighten the pipe to avoid water leakage.
Brazing is required on the refrigerant side.
1
15 13
6
2
10
3
4
14
7
16
5
11
98
17
F
12
16
R410a flow route
R134a flow route
Wafer flow
Brazing Precautions

In the event of brazing, please use nitrogen for sweeping. This can prevent the occurrence of oxidation
inside pipes. Oxidation will have adverse effects on the valves and compressors in the cooling system,
and may hamper normal operations.

Use the pressure relief valve to set the nitrogen pressure to 0.02 MPa (a pressure that can just be felt by
the skin).

Do not use antioxidants when brazing pipe connectors. Residues will block pipes and damage equipment.

Do not use a flux when brazing copper refrigerant pipes. Use copper-phosphorus alloys (BCuP) where no
flux is required.

Flux is harmful to the cooling pipe system. For example, if a chlorine-based flux is used, pipes will be
corroded. Especially when the flux contains fluorine, the flux will degrade the frozen oil.
Notes for installers and service engineers


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Midea VR High Temperature Hydraulic Module
Connecting wires
1
Power input
2
High Voltage Signal
3
Low Voltage Signal
4
Communication Cables
5
Magnetic Ring
6
Cable Tie
When the external wire enters the interior of the unit through a waterproof cable connector, you need to separate
the strong-current cable from the weak-current cable for cabling. For details, see the diagram.
Inside the unit, wires should be fixed by using a cable tie through the overpass-shape component.
Both the signal cable and output cable must be fitted with a magnetic ring, and then fixed on the overpass-shaped
component by using a cable tie.
1
2
3
4
5
5
5
6