Midea M2OC-18HFN1-M, Service Manual

Page: 17 / 128

In the other conditions, the highest frequency is
F20
7.4.2 Defrosting control
Condition of defrosting:
T3
≦
TempEnterDefrost_ADD
℃
and lasts for 40
minutes.
Defrosting action
：
off on
Cool-F9
10S 30S
TimeA 10S
4-way valve defrosting Defrosting over
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max 10 minutes
frequency
Compressor stops
off
Anti-cold control
off
480P 480P for 240s
Condition of ending defrosting:
If any one of following items is satisfied,
defrosting will stop and the machine will turn to
normal heating mode.
①
T3 > TempQuitDefrost_ADD
℃
;.
②
The defrosting time achieves 10min.
③
Turn to other modes or off.
7.4.3 Outdoor fan control
7.4.3.1 Cooling mode
For M3OD-27HRDN1-M:
27
25
High
Low
When low ambient cooling is valid:
27
High
Low
25
20
15
low ambient cooling
For M2OC-18HFN1-M, M2OD-18HFN1-M,M3OC-
30HRFN1-M, M4OC-36HRFN1-M:
T4
A DC_FAN_HI_SPD_ADD
B DC_FAN_MID_SPD_ADD
C DC_FAN_MIN_SPD_ADD
D DC_FAN_SLOW_SPD_ADD
E DC_FAN_SSLOW_SPD_ADD
23℃
22℃
20℃
28℃
19℃
17℃
26℃
25℃
Outdoor fan speed control logical (low ambient
cooling)
When T4 < 15
℃
and T3 < 30
℃
, the unit will
enter into low ambient cooling mode. The outdoor
fan will choose speed according to T3.
When T3
≥
38
℃
or when T4
≥
20
℃
, the outdoor
fan will choose the speed according to T4 again.