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5.1.19 Time cutting function:
connect the test program terminal on the mainboard after connecting the system to the power circuit.
The CPU of the main control will be 60 times faster.
5.1.20 Display function
When the system starts up or power on, the background and the LED will be fully lighted for 3
seconds. Then the LED displays the mode you have set.
5.1.20.1 Three-color background
The multi-color indicator is not lighted when the system is off. The mode-switching will change the
indicator colors. Red color is for heating mode, blue for cooling, water color for demoisturing, white for
automatic mode, pink for airflow sending, green for health mode and yellow green for air refreshing.
The colors health, refreshing colors are preferred to the mode colors. If different status exist at the
same time, then the last set color will be shown. The lighting key of the control board can turn on or off
the display.
5.1.20.2 LED display
*Set timing to display timing signs, set dormant mode to display dormant sign.(The dormant signs will
be shown on the G series panels.), set health mode to display health sign, set new airflow mode to
display new airflow sign and set violet disinfection to display health sign.
*Set auto, heating, demoisturing, heating to display the relative signs. When you use a remote control
to switch cooling, demoisturing and heating modes, the set temperature will be shown and the screen
board will return to the room temperature 5 seconds later. If you choose the airflow sending mode, the
screen board will show the room temperature directly.
*If the system is under malfunction status, the display will show the malfunction code. Please refer to
the malfunction list.
5.2 The control system of outdoor unit
5.2.1 The operation frequency of outdoor unit and its control
5.2.1.1 The operation frequency control of compressor
The operation frequency scope of compressor
Mode
H
e
t a
n i
g
R
e
r f
g i
r e
t a
o i
n
5.2.1.2 The starting of compressor
When the compressor is started for the first time, it must be kept under the conditions of 58Hz,88Hz
for one minute (the overheating protection of the outdoor unit air-blowing temperature, immediately
decrease the frequency when the compressor is overflowing and releasing the pressure) then it can
be operated towards the target frequency. When the machine runs normally, there's no such process.
After starting the compressor for operation, the compressor should run according to the calculated
frequency, and every determined frequency for protection should be prior to the calculated frequency.
5.2.1.3 The speeds of increasing or decreasing the frequency of the compressor
HSM18HEKC/HRAC03/R2(DB)HUM18HC03/R2(DB)-SM
Minimun operation frequency
2
0
H
z
2
0
H
z
Maximun operation frequency
1
0
0
H
z
9
0
H
z
21
Function and control
Domestic Air Conditioner
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