DHW Operation Priority
* When an immersion heater is available in the boiler, the disinfection temperature can reach 70℃.
Before floor heating, if a large amount of water remains on the floor, the floor may be warped or even ruptured during floor heating operation. Midea provides drying mode which is used after the initial installation of floor loops and preheating mode for the first heating during seasonal heating in order to protect the floor. During the process, the water temperature would be increased gradually.
Power limitation function makes the machine suitable for a variety of current supplies. There are 8 configurations for user to choose according to the maximum allowable access current. Only easy setting on the wired controller is needed, the units can suit more application.
Holiday away function is a mode for improving system reliability and saving energy. Unit operates in heating mode and/or DHW mode with low water temperature to prevent water from freezing in the winter during holidays. The user can pre-set, the disinfection mode before returning home to make sure that germ free water is available to be used when he returns.
With the help of Weather temperature curve function, water temperature will automatically change as outside air temperature changes, which saves energy while giving satisfying comfort. Totally 32 fixed Weather temperature curves can be manually set and one personalized curve is available.
Heat pump adjusts the operation mode according to different electrical signals from the grid to realize energy saving. When the electric price is low or even free, heat pump takes DHW priority. When electric price is high, DHW related functions are limited. When the electric price is normal, heat pump operates according to user requirement.
The DHW pump function is used to return water in the water pipe net to the hot water tank according to set timer. Total of 12 timers for one day can be set, which allows users to set the DHW pump operation time according to using habit to guarantee using hot water without waiting for a long time.
Mono 4kW model produces 35dB(A) sound pressure level at 3 meters thanks to multiple optimization design.
* Test condition:
No need to carry any other heavy equipment but only USB can realize program upgrade of indoor unit and outdoor unit. Parameter setting transmission between wired controllers. Installer can quickly copy the setting from one controller to another via USB, which saves the time of on-site installation.
Holiday Home function is used to deviate from the normal schedules without having to change them during the holiday at home.
* In the M-Thermal Arctic Split models, the controller is built into the hydro module.
* For M-Thermal Arctic Mono models, the controller is wall mounted.
M thermal system 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:
M thermal is an integrated system that provides space heating and cooling as well as domestic hot water, offering a complete, all-year-round solution which can eliminate the need for traditional gas or oil boilers, or work together with them. M thermal can be combined with floor heating loops, fan coil units, radiators and domestic water tanks. It can also be connected to solar collectors, gas furnaces, boilers and other heat sources. Smart Grid certification indicates that M thermal can fully utilize electricity from different sources or different price levels, which means like photovoltaic, and the peak valley of urban electricity supply to satisfy different modes operation, which is benefitial for cost saving.
Midea M-Thermal heat pump systems can be used in various scenarios. Below you will see the most common of them:
Floor heating loops is used for space heating and fan coil unit is used for both space heating and cooling. For heating mode, floor heating loops and fan coil unit require different operating water temperature. To achieve these two temperaturea, a mixing station (field supplied) which is consists of 3-way valve and water pump is used to adapt the water temperature according to requirements of the floor heating loops. The mixing station is controlled by the unit. For cooling mode, 2-way valve is used to prevent cool water from entering floor heating loops then result in condensation during cooling.
Backup electric heater(customized)* and AHS provide additional heating to raise the water temperature for unit outlet temperature.
TBH and solar system provide additional heating to raise the domestic hot water temperature. 3-way valve is used to switch between heating mode and DHW mode.
Double zones control is only available for heating mode. It can control different areas to reach different temperature to meet various needs of daily use.
Using wired controller only:
Wired controller sets the mode, temperature and on/off. Zone 1 is controlled based on the leaving water temperature. Zone 2 is controlled based on the leaving water temperature or built-in sensor integrated in the wired controller.
Using wired controller and thermostat:
Wired controller sets the mode and water temperature. Both Zone 1 and Zone 2 are controlled by thermostat.
Maximum of 6 room thermostats are available to be connected with the M-kit and 2 thermostats are connected to the hydraulic box, which enables for maximum of 8 rooms to be controlled. M-kit is connected to the hydraulic module.
Cascade system design is perfect when an extension of capacity becomes required as the building cooling/ heating demand evolves. Maximum 6 units can be controlled in group with one controller. Balance tank temperature control makes water temperature more accurate. AHS can only be connected to the master waterway and controlled by the master unit.
* The 4~16kW models can only be combined with each other to reach a larger total capacity of 4~96kW.
* The 18~30kW models can only be combined with each other to reach a larger total capacity of 18~180kW.
A stainless water tank and 3-way valve that is used to change the water flow direction between heating mode and DHW mode are integrated design inside the Hydronic Integrated Tank indoor unit, which greatly save the installation and commissioning cost on site.
|Technical Specifications for Three-phase Midea M-Thermal Arctic Mono MHC-V22W/D2RN8 Heat Pump|
|Seasonal space heating energy efficiency class6||LWT at 35°C||A+++|
|LWT at 55°C||A++|
|Sound power level 7||dB||73|
|Net dimension (W x H x D)||mm||1129×1558×440|
|Packing dimension (W x H x D)||mm||1220×1735×565|
|Net / Gross weight||kg||177/206|
|Water pump||Max. pump head||m||12.0|
|Water piping connection||mm||1-1/4“ BSP|
|Ambient temperature range||Cooling||°C||-5 ~ 46|
|Heating||°C||-25 ~ 35|
|DHW||°C||-25 ~ 43|
|LWT setting range||Cooling||°C||5 ~ 25|
|Heating||°C||25 ~ 60|
|DHW||°C||30 ~ 60|
|Cooling Capacity||23.00 kW|
|Heating Capacity||22.00 kW|