Haier AB25S2SC1FA, Service Manual

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• Test running.
1) To test cooling, set the lowest temperature at 16 °C. To test heating, set the highest temperature, at 30 °C. If the
temperature is lower than
16 °C, it is impossible to test cooling with remote controller, and also when the temperature is higher than 30 °C, it
is impossible to test heating.
2) Please check both cooling and heating operation of each unit individually and then also check the simultaneous
operation of all indoor units.
3) After running the unit for about 20 minutes, check the indoor unit outlet temperature.
4) After the unit is stopped, or working mode changed, the system will not start again for about 3 minutes.
5) During cooling operation, frost may occur on the indoor unit or pipes, this is normal.
• Communication LED
3U52S2SG1FA and 3U68S2SG1FA are with 3 green LED that means 3 indoor units, 4U70S2SH1FA and
4U85S2SH1FA with 4 green LED
means 4 indoor units. If one LED keep lighting that means the corresponding indoor unit has good communication
with outdoor unit. If one LED is not lighting, that means there is no communication between indoor and outdoor.
Notes:
1) When using this product, you need not to set the address. But the L/N wires between indoor & outdoor units
must be corresponded, or there will be communication failure.
2) Quiet Operation Setting. Set the DIP "8" to ON position of SW5, the system will run with lower noise, but the
max. capacity will also reduce slightly.
3) Do not change the settings of other switchs, wrong settings can make the system damage or other malfunctions.
6) Operate the unit according to the operation manual. Please kindly explain to our customers
how to operate through the instruction manual.
• Seven-segment numeric display
1) When unit is running, this seven-segment numeric will display the frequency of compressor.
For example, "
" means compressor running frequency is 40 Hz, " " means compressor
running frequency is 108Hz.
2) When faulty happens, seven-segment numeric will flash and display some numbers, this
number is failure code. For example, a flashing "
" means No.15 failure, that is indoor and
outdoor communication error.