Protection Function - Haier 1U18FS2ERA Service Manual

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
5.2.2.2 The outdoor fan control when heating
The temperature of the outdoor
air Ta
Ta 22
19 Ta<22
16 Ta<22
14 Ta<16
Ta<14
5.2.3 The control of the outdoor electronic expansion valve
When starting the compressor: the opening size of the valve must be guaranteed to have entered into
the standard opening size, and then the compressor can be started.
When refrigeration is in vain (the machine is shut down or is in the state of retrograde operation), the
opening size of the expansion valve of the indoor unit is 5 steps;
When heating is in vain, the opening size of the expansion valve of the indoor unit is 55 steps;
When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then begin
initialization.
The scope of refrigerationg valve
The scope of heating valve
The valves are adjusted according to the degree of superheat —SHa
5.2.4 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.
5.2.5

Protection function

The temperature of the outdoor
coil Te
——
——
——
——
——
——
15 Te
15 >Te
Airflow speed
Low
Keeping the speed
Medium
Keeping the speed
High
90-----480 steps
60-----480 steps
23
Funcitions and Control
Airflow speed
High
Keeping the speed
Medium
Keeping the speed
Low
Low
Low
Stop
SHa.
Domestic Air Conditioner