Midea M thermal Mono Series Dimensionsleitfaden

Engineering Data

M thermal Mono Series

R32

Commercial Air Conditioners

Midea CAC Confidential

M thermal Mono

2020051

CONTENTS

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

Part 2 Engineering Data ............................................................................... 15

Part 3 Installation and Field Settings.......................................................... 67

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Midea M thermal Mono Engineering Data Book

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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 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.

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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:M thermal Mono unit capacity range and unit appearances

Capacity

4kW

6kW

8kW

10kW

12kW

14kW

16kW

Model1

(MHC-)

V4W/D2N8-B

V6W/D2N8-B

V8W/D2N8-B

V10W/D2N8-B

V12W/D2N8-B

V12W/D2RN8-B

V14W/D2N8-B

V14W/D2RN8-B

V16W/D2N8-B

V16W/D2RN8-B

Appearance

Notes:

1. The presence or omission of the letter R in the model names indicates the unit’s power supply:

R: 3-phase, 380-415V, 50Hz; Omitted: 1-phase, 220-240V, 50Hz.

3Nomenclature

Version code

Refrigerant

N8: R32

Power Supply

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

Omitted: 1-phase, 220-240V, 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. If the outdoor unit selection is to be based on total heating load and total cooling load, select Mono units which satisfy not only the total heating load

requirements but also the total 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 Application 1

Figure 1-5.1: Application 1

Legend

Outdoor unit

Domestic hot water tank (Field supply)

User interface

14.1

TBH: Domestic hot water tank booster

heater (Field supply)

SV1:3-way valve (Field supply)

14.2

Coil 1, heat exchanger for heat pump

Balance tank (Field supply)

14.3

Coil 2, heat exchanger for Solar energy

5.1

Automatic bleed valve

Filter (Accessory)

5.2

Drainage valve

Check valve (Field supply)

5.3

Tbt1: Balance tank upper temperature

sensor (Optional)

Shut-off valve (Field supply)

5.4

Tbt2: Balance tank lower temperature

sensor (Optional)

Filling valve (Field supply)

P_o: Zone A circulation pump (Field supply)

Drainage valve (Field supply)

P_s: Solar pump (Field supply)

Tap water inlet pipe (Field supply)

9.1

Tsolar: Solar temperature sensor (Optional)

Hot water tap (Field supply)

9.2

Solar panel (Field supply)

Collector/distributor (Field supply)

P_d: DHW pipe pump (Field supply)

Bypass valve (Field supply)

T5: Domestic water tank temperature

sensor (Accessory)

FHL1…n

Floor heating loop (Field supply)

T1: Water flow temperature sensor

(Optional)

AHS

Auxiliary heat source (Field supply)

Expansion vessel (Field supply)

Notes:

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

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