Midea M thermal Mono Series Engineering Data page 66

7.14.6 HEAT MODE RUNNING operation
The HEAT MODE RUNNING operation is used to check the operation of the
system in space heating mode.
During the HEAT MODE RUNNING operation the M thermal unit leaving water
set temperature is 35°C. The current actual leaving water temperature is
displayed on the user interface. When the HEAT MODE RUNNING operation
starts, the heat pump first runs for 10 mins.
After 10 mins:
On systems where an auxiliary heat source (AHS) is installed, the AHS starts and runs for 10 mins (whilst the heat
pump continues running), after which the AHS stops and the heat pump continues to operate until the water
temperature rises to the set temperature or the heat mode running operation is exited by pressing OK.
On systems where a backup electric heater is being used, the backup heater turn on (on models where the backup
heater has a simple on/off control function). 3 mins later the backup electric heater will turn off. The heat pump will
then operate until the water temperature rises to the set temperature or the next command is received.
On systems with no auxiliary heat source (AHS), the heat pump will then operate until the water temperature rises to
the set temperature or the next command is received.
If any error code is displayed during the cool mode running operation, the cause should be investigated. Refer to Part 3, 8.2
"Error Code table".
7.14.7 DHW MODE RUNNING operation
The DHW MODE RUNNING operation is used to check the operation of the system in DHW mode.
During the DHW MODE RUNNING operation, the DHW set temperature is 55°C. On systems where a tank boost heater is
installed, the tank boost heater will turn on once the heat pump has run for 10 mins. The tank boost heater will turn off 3
min later and the heat pump will operate until the water temperature rises to the set temperature or the next command is
received.
202005
Figure 3-7.37: DHW MODE RUNNING display
11 TEST RUN
Test run is on.
DHW mode is on.
Water flow temper. is 45°C
Water tank temper. is 30°C
OK CONFIRM
Midea CAC Confidential
M thermal Mono
Figure 3-7.36: HEAT MODE RUNNING display
11 TEST RUN
Test run is on.
Heat mode is on.
Leaving water temperature is
15°C.
OK CONFIRM
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