Display Function; The Control System Of Outdoor Unit - Haier 2U14CS1ERA Service Manual

second—LCD screen lights for 0.5 second— the step-in motor fully output for 0.5 second—then
the motor doesn't output for 0.5 second—the motor fully output again for 0.5 second. The test
program finishes.
5.1.20 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.

5.1.21 Display function

When the system starts up, the background and the LCD will be fully lighted for 3 seconds. The
background colour is white.
5.1.21.1 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.

5.2 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
Heating
Refrigeration
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
34Hz,56Hz,82Hz 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
The speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/second
The speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds
2U14CS1ERA-SM
Minimun operation frequency
34Hz
34 Hz
Maximun operation frequency
96Hz
72Hz
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Functions and control
Domestic Air Conditioner