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M‐Thermal Split
Table 3‐6.4: Component control during force cool operation
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four‐way valve
6.4 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 Split Engineering Data Book Part 3, 8.4 "DHW MODE SETTING Menu".
Table 3‐6.5: Component control during fast DHW operation
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four‐way valve
Tank electric heater
6.5 Two zones control
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.
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.
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
zones control for heating is activated. On other conditions, the mixing valve will keep off.
When the valve initially turns on, the opening time and closing time is same and then the time is controlled according to
the difference between water pipe temperature and setting water temperature of the controlling zone.
Note:
1.
M‐Thermal units just have the controlling function, while the mixing valve, water pump of each zone need to be field
supplied and connect to M‐Thermal unit.
24 201909
Wiring diagram
label
COMP
FAN
EXV
4‐WAY
Wiring diagram
label
COMP
FAN
EXV
4‐WAY
TBH
1
Midea CAC Confidential
Control functions and states
4‐10kW
Runs at force cooling operation rotation speed
●
Runs at force cooling operation speed
●
304 (steps)
●
Off
●
Control functions and states
4‐10kW
Controlled according to load requirement
●
Controlled according to outdoor heat exchanger pipe
●
temperature
Position (steps) from 0 (fully closed) to 480 (fully open),
●
controlled according to discharge superheat
On
●
On
●
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