Midea M thermal A Mono Series, Руководство по обслуживанию

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M thermal Mono
20 202008
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6.2 Defrosting Operation
In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit air side heat exchanger
is performing as a condenser. The defrosting operation is controlled according to outdoor ambient temperature, air side
heat exchanger refrigerant outlet temperature and the compressor running time.
The defrosting operation ceases when any one of the following three conditions occurs:
Defrosting operation duration reaches 10 minutes.
The air side heat exchanger refrigerant outlet temperature is above 8°C for more than 10 seconds.
The air side heat exchanger refrigerant outlet temperature is above 12°C.
Water side heat exchanger water outlet temperature sensor is less than 10 for 5s and air side heat exchanger
refrigerant outlet temperature is above 5 .
Water side heat exchanger water outlet temperature sensor is less than 7 for 5s.
Table 3-6.3: Component control during defrosting operation
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP Runs at defrosting operation rotation speed
DC fan motor FAN_UP / FAN_DOWN Off
Electronic expansion valve EEV1 Fully open
Four-way valve ST Off
6.3 Fast DHW Operation
Fast DHW operation is used to quickly meet a requirement for domestic hot water when DHW priority has been set on the
user interface. Refer to the M thermal Mono Engineering Data Book Part 3, 7.4 DHW MODE SETTING Menu .
Domestic hot water demand priority can be ended by changing the switch on controller from "on" to "off".
Table 3-6.4: Component control during fast DHW operation
Component Wiring diagram label 18/22/26/30kW Control functions and states
Inverter compressor COMP
Controlled according to load requirement
DC fan motor FAN_UP / FAN_DOWN
Controlled according to outdoor heat exchanger pipe
temperature, ambient temperature and compressor
speed.
Electronic expansion valve EEV1
Controlled according to pressure, temperature and
compressor speed.
Four-way valve ST
On
Tank electric heater(Optional) TBH
On
6.4 Two zones control
1
Two zones control function is used to control temperature of each zone separately, thus different type radiator will operate
at its optimal temperature and water pump cycle time will be reduced to save energy.
Cooling mode
In two zones control for cooling mode, when the setting temperature of a certain zones is reached, the zone and water
pump of this zone will turn off.
Heating mode
In two zones control for heating mode, the on/off control of zone and water pump is same with cooling mode, but in
addition, the mixing valve (3-way valve SV3) control function will be activated to adjust the water temperature of the low
temperature zone by control the opening time and closing time of the valve. The mixing valve will only turn on when two
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