Midea M-Thermal Series Service Manual page 13

M‐Thermal Split
2.2 Hydronic box Piping
SMK‐60/CGN8 / SMK‐80/CGN8
Figure 2‐2.2: SMK‐60/CGN8 / SMK‐80/CGN8 piping diagram
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Legend
1 Water side heat exchanger
2 Water flow switch
3 Refrigerant liquid line temperature sensor
4 Refrigerant gas line temperature sensor
5 Water outlet temperature sensor
6 Water inlet temperature sensor
7 Air purge valve
8 Expansion vessel
Key components:
1. Air purge valve:
Automatically removes air from the water circuit.
2. Safety valve:
Prevents excessive water pressure by opening at 43.5 psi (3 bar) and discharging water from the water circuit.
3. Expansion vessel:
Balances water system pressure. (Expansion vessel volume: 3L.)
4. Water flow switch:
Detects water flow rate to protect compressor and water pump in the event of insufficient water flow.
5. Backup electric heater:
Provides additional heating capacity when the heating capacity of the heat pump is insufficient due to very low
outdoor temperature. Also protects the external water piping from freezing.
6. Manometer:
Provides water circuit pressure readout.
7. Water pump:
Circulates water in the water circuit.
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Midea CAC Confidential
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9 Water pump
10 Manometer
11 Safety valve
12 Refrigerant gas side
13 Refrigerant liquid side
14 Water outlet
15 Water inlet
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