Midea M-Thermal Series Service Manual page 12

2 Piping Diagrams
2.1 Outdoor Unit Piping
MHA‐V4W/D2N8 / MHA‐V6W/D2N8 / MHA‐V8W/D2N8 / MHA‐V10W/D2N8
Figure 2‐2.1: MHA‐V4(6,8,10)W/D2N8 piping diagram
Legend
1
2.1
2.2
2.3
2.4
3
4
5
6
Key components:
1. Electronic expansion valve (EXV):
Controls refrigerant flow and reduces refrigerant pressure.
2. Four‐way valve:
Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the air side heat
exchanger functions as a condenser and water side heat exchanger functions as an evaporator; when open, the air
side heat exchanger functions as an evaporator and water side heat exchanger function as a condenser.
3. High and low pressure switches:
Regulate refrigerant system pressure. When refrigerant system pressure rises above the upper limit or falls below the
lower limit, the high or low pressure switches turn off, stopping the compressor.
4. Separator:
Separates liquid refrigerant from gas refrigerant to protect compressor from liquid hammering.
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Compressor
Discharge pipe temperature sensor
Outdoor ambient temperature sensor
Air side heat exchanger refrigerant outlet temperature sensor
Suction pipe temperature sensor
4‐way valve
Air side heat exchanger
Distributor
Filter
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7 Electronic expansion valve
8 Stop valve (liquid side)
9 Stop valve (gas side)
10 Pressure sensor
11 Separator
12.1 Low pressure switch
12.2 High pressure switch
13 Capillary
14 Solenoid valve
M‐Thermal Split