Midea 11DSNA-A-1301, Service Manual, Page: 43 / 66

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Indoor fan speed can be set as high, medium, low or auto fan and the anti-cold-wind function is
preferential.
Auto fan action in heating mode:
2.5
2
High
Low
1
Medium
1.5
8.4.3.4 Defrosting mode
Condition of defrosting:
----T4
＞
0
℃
,
When the units are running, if the following two items are satisfied, the units start defrosting:
The units run with T3
＜
3
℃
for 40 minutes and T3 keeps lower than TCDI
℃
for more than 3 minutes.
The units run with T3
＜
3
℃
for 80 minutes and T3 keeps lower than TCDI+2
℃
for more than 3
minutes.
----T4
＜
0
℃
,
If the 1
st
condition and 2
nd
condition items are satisfied, then the program judges if T2 has decreased
more than 5
℃
.When T2 has decreased more than 5
℃
, enter the defrosting mode.
----No matter what value T4 is, if the machine runs with T3
＜
3
℃
for more than 120 minutes and T3
keeps lower than TCDI+4
℃
for more than 3 minutes, the machine will enter defrosting mode no
matter if T2 drops more than 5
℃
or not.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE1
℃
.
----T3 keeps to be higher than TCDE2
℃
for 80 seconds.
----The machine has run for 10 minutes in defrosting mode.