Midea 9ASI-A-1209, Руководство по обслуживанию

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If T4
＞
5
℃
or the compressor starts running, the preheating function will stop.
8.3.8 Zero crossing detection error protection(except MS9A-24HRDN1-QRC4W)
If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display
the failure. The correct zero crossing signal time interval should be between 6-13ms.
8.3.9 Sensor protection at open circuit and breaking disconnection.
When there’s one temperature sensor in malfunction, the air conditioner will display error code and will
not stop immediately, to avoid the case that the air conditioner is in urgent need.
Fault temp.
sensor Operation in cooling, drying and
fan only mode Operation in heating mode
T1 Run supposed T1=26
℃
high fan
speed
Run supposed T1=26
℃
high fan
speed
T2 Refer to table 1 Refer to table 2
T3 Run with compressor frequency
not higher than F14 3 minutes’ defrosting every 40
minutes when T4<7
℃
; 2 minutes’
defrosting every 90 minutes when
T4
≥ 7 ℃ .
T4
Run supposed T4=50 ℃ Run supposed T4=15 ℃
TP
Run supposed T4=50
℃
Run supposed T4=15
℃
T1
25
23
F12
F4(30 minutes on+3
minutes off)
table 1
T1
20
18
F4
F12(Indoor fan 1 minute
off, 1 minute M- ane then
the setting fan speed.)
table 2
8.4.10 Refrigerant leakage detection
This function is only active in cooling mode. It can better prevent the compressor being damaged
by refrigerant leakage or compressor overload.
Open condition:
Define the evaporator coil temp.T2 of the compressor just starts running as Tcool.
In the beginning 5 minutes after the compressor starts up, if T2
＜
Tcool
－
2
℃
does not keep