Haier 1U12BS3ERA Service Manual page 20

7.1.2 The outdoor fan control (Exchange fan)
When the fan is changed among every airflow speed (including stop blowing), in order to avoid the
airflow speed from skipping frequently, it must be kept under each mode for over 30 seconds, and then
it can be changed to another mode (when cooling, the time is changed to 15 seconds).
7.1.2.1 The outdoor fan control when cooling or dehumidifying
After the compressor is started for 5 seconds, the outdoor fan is started at the medium speed at
first, after 30 seconds, it begins to control the airflow speed according to the temperature conditions of
the outdoor environment.
The temperature of the
outdoor air Ta
Ta 30
26 Ta<30
24 Ta<26
23 Ta<24
10 Ta<23
5 Ta<10
Ta<5
7.1.2.2 The outdoor fan control when heating
The temperature of the outdoor air (Ta)
7.1.3 Four way control
For the details of defrosting four-way valve control, see the defrosting process.
Four way working in other ways:
Under the mode of heating, open the four-way valve, when the compressor is not started or
changed to non-heating mode, make sure the compressor is stoped for 2 minutes, and then close the
four-way valve.
7.1.4 Protection function
7.1.4.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC(air-blowing temp) overheating protection of
air-blowing, but air-blowing sensor malfunction must alarm after 4 minutes during which the
compressor is started (during the course of self-detection, there's no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,
detection method for each time: continuously sampling for 8 times, then order them and take the mean
value of the middle 2 values), take the mean value.
The temperature of the outdoor
Ta 22
19 Ta<22
16 Ta<22
14 Ta<16
Ta<14
coil Te
——
——
——
——
——
——
15 Te
15 >Te
Airflow speed
Keeping the speed
Keeping the speed
18
Functions and control
Airflow speed
High
Keeping the speed
Medium
Keeping the speed
Low
Keeping the speed
Low
Stop
Low
Medium
High
Domestic air conditioner