Midea M thermal Mono Series Dimensionsleitfaden

Engineering Data

M thermal A Series Mono(18~30kW)

R32

Commercial Air Conditioners

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M thermal Mono

201910 1

CONTENTS

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

Part 2 Engineering Data ............................................................................... 17

Part 3 Installation and Field Settings.......................................................... 35

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M thermal Mono

2 201910

Midea M thermal Mono Engineering Data Book

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M thermal Mono

202005 3

Part 1 - General Information

Part 1

General Information

1 M thermal Mono System............................................................................ 4

2 Unit Capacities ........................................................................................... 6

3 Nomenclature ............................................................................................ 6

4 System Design and Unit Selection .............................................................. 7

5 Typical Applications ................................................................................... 9

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Midea M thermal Mono Engineering Data Book

1M thermal Mono System

1.1 System Schematic

Figure 1-1.1: System schematic

M thermal Mono is an integrated air-to-water space heating, space cooling and domestic hot water heat pump system.

The outdoor heat pump system extracts heat from the outdoor air and transfers this heat through refrigerant piping to the

plate heat exchanger in the hydronic system. The heated water in the hydronic system circulates to low temperature heat

emitters (floor heating loops or low temperature radiators) to provide space heating, and to the domestic hot water tank

to provide domestic hot water. The 4-way valve in the outdoor unit can reverse the refrigerant cycle so that the hydronic

system can provide chilled water for cooling using fan coil units.

M thermal Mono is an integrated air to water heat pump system which is one-stop solution for space heating, space

cooling and domestic hot water. The outdoor heat pump system extracts heat from the outdoor air and transfers this heat

through refrigerant piping to the plate heat exchanger in the hydronic system. The heated water in the hydronic system

circulates to low temperature heat emitters (floor heating loops or low temperature radiators) to provide space heating,

and to the domestic hot water tank to provide domestic hot water. The 4-way valve in the outdoor unit can reverse the

refrigerant cycle so that the hydronic system can provide chilled water for cooling using fan coil units.

The heating capacity of heat pumps decreases with ambient temperature dropping. M thermal Mono can be equipped

with a backup electric heater to provide additional heating capacity for use during extremely cold weather when the heat

pump capacity is insufficient. The backup electric heater also serves as a backup in case of heat pump malfunction and for

anti-freeze protection of the outside water piping in winter.

M thermal Mono Outdoor Unit

Distributor

Collector

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Part 1 - General Information

1.2 System Configurations

M thermal Mono can be configured to run with the electric heater either enabled or disabled and can also be used in

conjunction with an auxiliary heat source such as a boiler.

The chosen configuration affects the size of heat pump that is required. Three typical configurations are described below.

Refer to Figure 1-1.2.

Configuration 1: Heat pump only

The heat pump covers the required capacity and no extra heating capacity is necessary.

Requires selection of larger capacity heat pump and implies higher initial investment.

Ideal for new construction in projects where energy efficiency is paramount.

Configuration 2: Heat pump and backup electric heater

Heat pump covers the required capacity until the ambient temperature drops below the point at which the heat

pump is able to provide sufficient capacity. When the ambient temperature is below this equilibrium point (as shown

in Figure 1-1.2), the backup electric heater supplies the required additional heating capacity.

Best balance between initial investment and running costs, results in lowest lifecycle cost.

Ideal for new construction.

Configuration 3: Heat pump with auxiliary heat source

Heat pump covers the required capacity until the ambient temperature drops below the point at which the heat

pump is able to provide sufficient capacity. When the ambient temperature is below this equilibrium point (as shown

in Figure 1-1.2), depending on the system settings, either the auxiliary heat source supplies the required additional

heating capacity or the heat pump does not run and the auxiliary heat source covers the required capacity.

Enables selection of lower capacity heat pump.

Ideal for refurbishments and upgrades.

Figure 1-1.2: System configurations

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2Unit Capacities

Table 1-2.1: Unit capacities range and appearances

Capacity

18kW

22kW

26kW

30kW

Model

(MHC-)

V18W/D2RN8

V22W/D2RN8

V26W/D2RN8

V30W/D2RN8

Appearance

3Nomenclature

Refrigerant

N8: R32

Power Supply

R: 3-phase, 380-415V, 50Hz

Compressor and fan motor types

D2: All DC

Unit category

W: Outdoor unit

Capacity index

The capacity in kW

Inverter

Mono

Heat pump

Midea

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Part 1 - General Information

4System Design and Unit Selection

4.1 Selection Procedure

Step 1: Total heat load calculation

Calculate conditioned surface area

Select the heat emitters (type, quantity, water temperature and heat load)

Step 2: System configuration

Decide whether to include AHS and set AHS’s switching temperature

Decide whether backup electric heater is enabled or disabled

Step 3: Selection of outdoor units

Determine required total heat load on outdoor units

Set capacity safety factor

Select power supply

Provisionally select M thermal Mono unit capacity based on nominal

capacity

Correct capacity of the outdoor units for the following items:

Outdoor air temperature / Outdoor humidity / Water outlet temperature1/

Altitude / Anti-freeze fluid

Is corrected M thermal Mono unit capacity ≥Required total heat load on

outdoor units2

Yes

M thermal Mono system

selection is complete

Select a larger model or enable

backup electric heater operation

Notes:

1. If the required water temperatures of the heat emitters are not all the same, the M thermal Mono’s outlet water temperature setting should be set at the

highest of the heat emitter required water temperatures. If the water outlet design temperature falls between two temperatures listed in the outdoor

unit's capacity table, calculate the corrected capacity by interpolation.

2. Select Mono units which should satisfy both total heating and cooling load requirements.

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4.2 M thermal Leaving Water Temperature (LWT) Selection

The recommended design LTW ranges for different types of heat emitter are:

For floor heating: 30 to 35⁰C

For fan coil units: 30 to 45⁰C

For low temperature radiators: 40 to 50⁰C

4.3 Optimizing System Design

To get the most comfort with the lowest energy consumption with M thermal, it is important to take account of the

following considerations:

Choose heat emitters that allow the heat pump system to operate at as low a hot water temperature as possible

whilst still providing sufficient heating.

Make sure the correct weather dependency curve is selected to match the installation environment (building

structure, climate) as well as ender user’s demands.

Connecting room thermostats (field supplied) to the hydronic system helps prevent excessive space heating by

stopping the outdoor unit and circulator pump when the room temperature is above the thermostat set point.

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Part 1 - General Information

5Typical Applications

5.1 Space Heating

The room thermostat is used as a switch. When there is a heating request from the room thermostat, the Mono unit

operates to achieve the target water temperature set on the user interface. When the room temperature reaches the

thermostat’s set temperature, the unit stops.

Figure 1-5.1: Space heating

Table 1-5.1: Space heating

Legend

Outdoor unit

Room thermostat (field supplied)

1.1

Manometer

Drain valve (field supplied)

1.2

Pressure relief valve

Fill valve (field supplied)

1.3

Expansion vessel

Balance tank (field supplied)

1.4

Plate heat exchanger

8.1

Air purge valve

1.5

Air purge valve

8.2

Drain valve

1.6

Flow switch

Expansion vessel (field supplied)

1.7

P_i: Circulation pump inside the unit

P_o: Outside circulation pump (field supplied)

Y-shape filter

Collector / Distributor (field supplied)

Stop valve (field supplied)

FHL 1...n

Floor heating loop (field supplied)

Wired controller

Notes:

1. The example is just for application illustration; please confirm the exact installation method according to the installation manual.

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