Other Functions - Midea MFM-24ARN1-Q Service Manual

Floor Standing MFM DM16-01.01.25en

Other Functions

9.4
9.4.1 LCD display
Mode, Set temp, fan speed, time, timer, protection etc.
9.4.2 Timer function
9.4.2.1 Timing range is 24 hours.
9.4.2.2 Timer on. The machine will turn on automatically when reaching the setting time.
9.4.2.3 Timer off. The machine will turn off automatically when reaching the setting time.
9.4.2.4 Timer on/off. The machine will turn on automatically when reaching the setting "on" time, and
then turn off automatically when reaching the setting "off" time.
9.4.2.5 Timer off/on. The machine will turn off automatically when reaching the setting "off" time, and
then turn on automatically when reaching the setting "on" time.
9.4.2.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it
will not start up firstly after setting the "timer off" function. And when reaching the setting time, the
timer LED will be off and the AC running mode has not been changed.
9.4.2.7 The setting time is relative time.
9.4.3 Economy function
9.4.3.1 It is valid in cooling, heating and auto mode.
9.4.3.2. Turning off, changing mode or setting fan speed will cancel economy function.
9.4.3.3 Operation process in sleep mode is as follow:
After pressing ECONOMIC or SLEEP button on the controller, the machine will go into economy
mode.
When cooling, the setting temperature rises 1℃(be lower than 30℃) every hour, 2 hours later the
setting temperature stops rising.
For heat pump models, when they are in heating, the setting temperature reduces 1℃(be higher
than 17℃) every hour, 2 hours later the setting temperature stops reducing.
9.4.3.4 In this mode, the fan speed is forced into AUTO mode.
9.4.4 Refrigerant leakage detection
This function is only active in cooling mode and dehumidifying 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
continuous 4 seconds and this situation happens 3 times, the display area will show "EC" and AC
will turn off.
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