Haier H2SM-(9+12)HV03/R2 Service Manual page 49

The outdoor system will decide the operation mode based on the principle of ¡ ® first order
preferred¡ ¯ according to the startup signals of the two indoor systems.
a) cooling: Under the cooling operation, the four direction latch will not be closed.
The outdoor fan will operate at the cooling mode. The compressor will operate under
the cooling frequency.
b) heating: Under the heating operation, the four direction latch will be closed. The
outdoor fan will operate at the heating mode. The compressor will operate under the heating
frequency. When frosts appear at the outdoor system, the system will enter into the
defrosting operation automatically. After the completion of the defrosting, the system
will be resumed.
1. heat defrosting operation
1.1 Under the heating operation, when the indoor heat interaction temperature is below the
ambient temperature and the heat interaction temperature is below zero centigrade, the
frosts will appear on the heat exchanger. When the aggregated frost affects the heat
interaction, the defrosting operation will begin.
1.2 frost confirmation condition. When either of the following condition appears, the system
will enter the defrosting mode.
b) continuous operation for 47 minutes and Ta¡ Ý 5¡ æ , if Te ¡ Ü -3¡ æ
b) continuous operation for 47 minutes and Ta£ ¼ 5¡ æ , if Te¡ Ü -7¡ æ
c) continuous operation for 47 minutes and Ta£ ¼ -3¡ æ , if Te¡ Ü -9¡ æ
d) If Ta¡ Ü -3¡ æ and the compressor worked for 3 hours without a defrosting operation, the
system will process the defrosting for one time.
1.2.1 Defrosting process: After entering the defrosting operation, the compressor and the fan
will be stopped. The four direction latch will be opened 30 seconds later. And the compressor
will restart 10 seconds later. The system begins the defrosting operation.
1.2.5 defrosting quitting condition:
i) Time control: Defrosting time lasts 10 (EEPROM) minutes, the defrosting operation ends.
ii) Heat interaction control: When Te¡ Ý 14¡ æ (
1.2.6 Defrosting quitting process
After the completion of the defrosting, the compressor stops. 50 seconds later, the four
direction latch changes direction. 10 seconds later, the compressor will start and the original
heating operation resumes.
1.2.7 After the entering into the frosting mode, the compressor will operate at least for
1 minutes before stopping the defrosting. (The timing starts as the four direction latch
starts.)
1.3 Outdoor main relay control
The outdoor main relay closure will be delayed for 2 seconds after connecting to the circuit.
1.4 Outdoor airflow control
1.4.1 airflow control at the cooling mode.
After the compressor is turned on for 5 seconds, the outdoor fan will start at a high speed.
10 seconds later, the speed will be controlled according to the outdoor ambient temperature.
If the outdoor has only two option, M operates on H and L operates on L.
Air Conditioner
OUTDOOR SYSTEM FUNCTIONS
EEPROM
45
Edition:2006/1/10
for 2 minutes.
for 2 minutes.
for 2 minutes.
), the defrosting operation ends.