The Control System Of Outdoor Unit - Haier 2HUM18HC03/R2 Service Manual

second—LED 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.

5.2 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
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
The speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/second
The speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds
5.2.1.4 The calculation of the compressor's frequency
1 The minimum/maximum frequency limitation
A While refrigerating:
compressor;
B While heating:
IN
1 The frequency limitation which is affected by the environment temperature.
Heating mode:
2HUM18HC03/R2(DB)-SM
Minimun operation frequency
20Hz
20 Hz
IN is the minimum operation frequency of the compressor.
is the minimum operation frequency of the compressor.
Maximun operation frequency
120Hz
80Hz
is the maximum operation frequency of the
is the maximum operation frequency of the compressor;
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Wiring diagrams
Domestic air conditioner