M thermal Mono       
98    202005 
Midea M thermal Mono Engineering Data Book 
7.15  SPECIAL FUNCTION 
7.15.1  SPECIAL FUNCTION menu overview 
MENU > FOR SERVICEMAN > SPECIAL FUNCTION 
 
SPECIAL  FUNCTION  is  used  to  pre-heating  floor  and 
drying up  floor  once  installation  is  complete or the  first 
time start up the unit or restart the unit after a long time 
stop. 
 
7.15.2  PREHEATING FOR FLOOR 
MENU > FOR SERVICEMAN > SPECIAL FUNCTION > PREHEATING FOR FLOOR 
 
Before floor heating, if a large amount of water remains on the floor, the floor may be warped or even rupture during floor 
heating operation, in order to protect the floor, floor drying is necessary, during which the temperature of the floor should 
be increased gradually. 
 
During first operation of the unit, air may remain in the water system which can cause malfunctions during operation. It is 
necessary to run the air purge function to release the air (make sure the air purge valve is open). 
 
T1S  sets  the  heat  pump’s  leaving  water  set  temperature  in  preheating  for floor 
mode.   
 
t_fristFH sets the duration of preheating for floor mode. 
 
The operation of the unit during preheating for floor mode is illustrated in Figure 
3-7.37. 
 
 
 
 
 
Figure 3-7.42: Preheating for floor 
Abreviations: 
t_interval_H: Compressor re-start delay in space heating mode. (Refer to Part 
3, 8.6 “HEAT MODE SETTING Menu”). 
 
Whilst  the  preheating  for floor  operation is  running,  the number of  minutes that it has  been  running  for  and  the  heat 
pump’s  leaving  water  temperature  are  displayed  on  the  user  interface.  During  the  preheating  for  floor  operation  all 
buttons except OK are inactivated. To exit the preheating for floor operation, press OK and then select YES when prompted. 
Refer to Figure 3-7.38. 
Figure 3-7.40: Special functions menu 
Figure 3-7.41: Preheating for floor menu 
12 SPECIAL FUNCTION
Active the settings and active the
 “SPECIAL FUNCTION”?
OK CONFIRM
NO YES
OK ENTER
12 SPECIAL FUNCTION
12.1 PREHEATING FOR FLOOR
12.2 FLOOR DRYING UP
12.1 PREHEATING FOR FLOOR
30°C
72 HOURS
ADJUST
T1S
t_fristFH
ENTER                       EXIT