Midea M thermal Mono Series Engineering Data page 65

M thermal Mono
7.14.3 AIR PURGE operation
MENU > FOR SERVICEMAN > TEST RUN > AIR PURGE
Once installation is complete it is important to run the air purge function to remove any air which may be present in the water
piping and which could cause malfunctions during operation.
The AIR PURGE operation is used to remove air from the water piping. Before running
AIR PURGE mode, make sure
operation starts, the 3-way valve opens and the 2-way valve closes. 60 secs later the
pump in the unit (PUMPI) operates for 10min during which the flow switch does not
work. After the pump stops, the 3-way valve closes and the 2-way valve opens. 60
secs later both PUMPI and PUMPO operate until the next command is received. If any
error code is displayed during the air purge operation, the cause should be
investigated. Refer to Part 3, 9.2 "Error Code table".
7.14.4 CIRCULATION PUMP RUNNING operation
MENU > FOR SERVICEMAN > TEST RUN > CIRCULATION PUMP RUNNING
The CIRCULATION PUMP RUNNING operation is used to check the
operation of the circulation pump. When the circulation pump running
operation starts, all running components stop. 60 secs later, SV1 opens
and SV2 closes. After a further 60 secs PUMPI starts. 30 seconds later, if
the flow switch detects that the water flow is normal, PUMPI operates for
3 min. After the pump stops 60s, the SV1 closes and SV2 opens. 60s later
both PUMI and PUMPO will operate. After a further 2 min the flow switch
start to check the water flow. If the water flow rate is sufficient, both PUMPI and PUMPO operate until the next command
is received. If the water flow rate is insufficient over any 15-second period, PUMPI and PUMPO stop and error code E8 is
displayed. Refer to Part 3, 8.2 "Error Code table".
7.14.5 COOL MODE RUNNING operation
MENU > FOR SERVICEMAN > TEST RUN > COOL MODE RUNNING
The COOL MODE RUNNING operation is used to check the operation of the
system in space cooling mode.
During the COOL MODE RUNNING operation, the M thermal unit leaving water
set temperature is 7°C. The current actual leaving water temperature is
displayed on the user interface. The unit operates until the leaving water
temperature drops 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".
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that the air purge valve is open.
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Figure 3-7.33: AIR PURGE operation
When the air purge
Figure 3-7.34: CIRCULATION PUMP RUNNING display
11 TEST RUN
Test run is on.
Circulation pump is on.
OK CONFIRM
Figure 3-7.35: COOL MODE RUNNING display
11 TEST RUN
Test run is on.
Cool mode is on.
Leaving water temperature is
15°C.
OK CONFIRM
11 TEST RUN
Test run is on.
Air purge is on.
OK CONFIRM
202005