Midea MSMTAU-09HRFN8-QRD6GW, Service Manual

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2. Auto fan
2.1 Rise curve
-When T1-Tsc is higher than -1.5°C, fan
speed reduces to 80%;
-When T1-Tsc is higher than 0°C, fan speed
reduces to 60%;
-When T1-Tsc is higher than 0.5°C, fan
speed reduces to 40%;
-When T1-Tsc is higher than 1°C, fan speed
reduces to 20%.
2.2 Descent curve
-When T1-Tsc is lower than or equal to 0.5°C,
fan speed increases to 20%;
-When T1-Tsc is lower than or equal to 0°C,
fan speed increases to 60%;
-When T1-Tsc is lower than or equal to
-1.5°C, fan speed increases to 80%;
-When T1-Tsc is lower than or equal to
-3°C, fan speed increases to 100%.
9.4.3.4 Defrosting mode
The unit enters defrosting mode according to
changes in the temperature value of T3, T4 and
the compressor running time.
In defrosting mode, the compressor continues
to run, the indoor and outdoor motor will cease
operation, the defrost light of the indoor unit will
turn on, and the symbol is displayed.
.If any one of the following condition is satisfied,
defrosting ends and the machine switches to
normal heating mode:
----T3 rises above TCDE1
℃
.
----T3 maintained above TCDE2
℃
for 80 seconds.
----
Unit runs for 15 minutes consecutively in
defrosting mode.
.
9.4.3.5 Evaporator Coil Temperature
Protection
60
T2
Resume
Off
Decrease
TEH2
52
Hold
Off: Compressor stops.
Decrease: Decrease the running frequency to
the lower level per 20 seconds.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
9.4.4 Auto-mode
This mode can be selected with the remote
controller and the temperature setting can be
adjusted between 16°C~30°C.
In auto mode, the machine selects cooling,
heating, auto-drying or fan-only mode on the
basis of T1,Ts, T4 and relative humidity(
φ
).
Ts+3
T1
Auto
Drying
Cooling
Fan
Ts+2
Ts+1
Heating
Ts-3
φ
T4
13 18 28
Cooling
Fan
Heating
85%
Cooling
Fan
Cooling
If the setting temperature is modified, the
machine selects a new running function.
9.4.5 Drying Mode
In drying mode, AC operates the same as auto