Haier AS24GS1ERA Service Manual page 27

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 The outdoor defrosting control
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When starting running heating, the compressor continuously runs for over 10 minutes, after running
for 45 minutes in all (defrosting is ended or when entering into refrigeration mode, clear the
compressor's cumulative run time), through detecting the defrosting sensor TCS detect the defrosting
situation of the heat exchanger of the outdoor unit and the outdoor environment temperature sensor
TA, and meeting the following conditions continuously for 2 minutes, the machine enters into the
defrosting operation:
TCS≤C×TA α
α is determined as the following according to the data of EEPROM:
C selcet if Tao 0
The temperature limitation for entering into defrosting mode -15 ≤C×TA α≤-5
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When the result of C×TA α is in the scope of -15 ≤C×TA
AS24GS1/2ERA 1U24GS1ERA-SM
Airflow speed
Low
Keeping the speed
Medium
Keeping the speed
High
60-----480 steps
90-----480 steps
C=0.8;if Tao≥0 C=0.6
24
αis read from EEPROM Normal State: α=6
α, the interval between two
Domestic Air Conditioner
Function and Control
SHa.