Midea M thermal Mono Series Dimension Guide

Engineering Data
M thermal Mono Series
R32
Commercial Air Conditioners
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M thermal Mono
2020051
CONTENTS
CONTENTS
Part 1 General Information............................................................................ 3
Part 2 Engineering Data ............................................................................... 15
Part 3 Installation and Field Settings.......................................................... 67
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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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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
H
16
M
C
V
W
D2
R
-
N8
/
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
-
B
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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
No
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
1
Outdoor unit
14
Domestic hot water tank (Field supply)
3
User interface
14.1
TBH: Domestic hot water tank booster
heater (Field supply)
4
SV1:3-way valve (Field supply)
14.2
Coil 1, heat exchanger for heat pump
5
Balance tank (Field supply)
14.3
Coil 2, heat exchanger for Solar energy
5.1
Automatic bleed valve
15
Filter (Accessory)
5.2
Drainage valve
16
Check valve (Field supply)
5.3
Tbt1: Balance tank upper temperature
sensor (Optional)
17
Shut-off valve (Field supply)
5.4
Tbt2: Balance tank lower temperature
sensor (Optional)
18
Filling valve (Field supply)
6
P_o: Zone A circulation pump (Field supply)
19
Drainage valve (Field supply)
9
P_s: Solar pump (Field supply)
20
Tap water inlet pipe (Field supply)
9.1
Tsolar: Solar temperature sensor (Optional)
21
Hot water tap (Field supply)
9.2
Solar panel (Field supply)
23
Collector/distributor (Field supply)
10
P_d: DHW pipe pump (Field supply)
24
Bypass valve (Field supply)
11
T5: Domestic water tank temperature
sensor (Accessory)
FHL1…n
Floor heating loop (Field supply)
12
T1: Water flow temperature sensor
(Optional)
AHS
Auxiliary heat source (Field supply)
13
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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