Midea M thermal A Mono Series Bedienungsanleitung

M thermal A Series Mono(18~30kW)

Commercial Air Conditioners

R32

Service

Manual

Midea CAC

Confidential

M thermal Mono

202008 1

CONTENTS

Part 1 General Information ............................................................................ 3

Part 2 Component Layout and Refrigerant Circuits ..................................... 5

Part 3 Control ............................................................................................... 11

Part 4 Diagnosis and Troubleshooting ......................................................... 25

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M thermal Mono

2 202008

Midea M thermal Mono

Service Manual

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M thermal Mono

202008 3

Part 1

General Information

Part 1

General Information

1 Unit Capacities and External Appearance .............................................. 4

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4 202008

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Service Manual

1 Unit Capacities and External Appearance

1.1 Unit Capacities

Table 1-1.1: Capacity range

Capacity 18kW 22kW 26kW 30kW

Model MHC-V18W/D2RN8 MHC-V22W/D2RN8 MHC-V26W/D2RN8 MHC-V30W/D2RN8

1.2 External Appearance

Table 1-1.2: Appearance

18/22/26/30kW

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202008 5

Part 2

Component Layout

and

Refrigerant Circuits

Part 2

Components Layout and

Refrigerant Circuits

1 Layout of Functional Components .............................................................. 6

2 Piping Diagrams ......................................................................................... 7

3 Refrigerant Flow Diagrams ......................................................................... 9

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Midea M thermal Mono

Service Manual

1 Layout of Functional Components

Figure 2-1.1: MHC-V18(22,26,30)W/D2RN8 front view

Air side heat exchanger

Fan motor

Gas-liquid separator

DC inverter compressor

Electric control box

4-way valve

Pressure sensor

Electronic expansion valve

High pressure switch

Low pressure switch

Water pump

Safety valve

Manometer

Figure 2-1.2: MHC-V18(22,26,30)W/D2RN8 side view

Expansion vessel

Accumulator

One-way valve

Air purge valve

Water flow switch

Water side heat exchanger

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Part 2

Component Layout

and

Refrigerant Circuits

17 18

21 22 23 24

2 Piping Diagrams

Figure 2-2.1: MHC-V18(22,26,30)W/D2RN8 piping diagram

Legend

1 Compressor 15 Low pressure switch

2 Discharge temperature sensor 16 Suction temperature sensor

3 High Pressure Switch 17 Single-way electromagnetic valve

4 4-Way Valve 18 Capillary

5 Outdoor temperature sensor 19 Water Inlet temp. sensor

6 Air side heat exchanger 20 Y-shape filter (Accessories)

7 Air side heat exchanger refrigerant outlet temperature sensor(cooling) 21 Water outlet temp. sensor

8 Filter 22 Manometer

9 Electronic expansion valve 23 Safety valve

10 Accumulator 24 Circulating pump

11 Refrigerant temperature sensor (liquid line) 25 Expansion vessel

12 Refrigerant temperature sensor (gas line) 26 Air purge valve

13 Pressure sensor 27 Flow switch

14 Gas-liquid separator

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Service Manual

Key components:

1. Accumulator:

Stores liquid refrigerant and oil to protect compressor from liquid hammering.

2. Electronic expansion valve (EXV):

Controls refrigerant flow and reduces refrigerant pressure.

3. 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.

4. 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.

5. Air purge valve:

Automatically removes air from the water circuit.

6. Safety valve:

Prevents excessive water pressure by opening at 43.5 psi (3 bar) and discharging water from the water circuit.

7. Expansion vessel:

Balances water system pressure. (Expansion vessel volume: 8L in 18/22/26/30kW units)

8. Water flow switch:

Detects water flow rate to protect compressor and water pump in the event of insufficient water flow.

9. Manometer:

Provides water circuit pressure readout.

10. Water pump:

Circulates water in the water circuit.

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M thermal Mono

202008 9

Part 2

Component Layout

and

Refrigerant Circuits

Pressure sensor

Filter

Electronic

expansion valve

Filter

High pressure

switch

Low pressure

switch

Air side heat exchanger

4-way

valve

High tempera

re, high pressure g

High temperature, high pressure liquid

Low temperature, low pressure

Single-way electromagnetic valve Capillary

Accumulator

Pressure sensor

Filter

Electronic

expansion valve

Filter

High pressure

switch

Low pressure

switch

Air side heat exchanger Accumulator

4-way

valve

High tempera

re, high pressure g

High temperature, high pressure liquid

Low temperature, low pressure

Single-way electromagnetic valve Capillary

3 Refrigerant Flow Diagrams

Heating and domestic hot water operation

Figure 2-3.1: Refrigerant flow during heating or domestic hot water operation

Cooling and defrosting operation

Figure 2-3.2: Refrigerant flow during cooling and defrosting operations

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