Haier 3U19FS1ERA Service Manual - Page 49

>_]]VbTZR\ _^UZdZ_^Vb Before starting the test running, please confirm the following works have been done successfully. 1) Correct piping work; 2) Correct wiring work; 3) Correct match of indoor and outdoor unit; 4) Proper recharge of refrigerant if needed. Make sure that all the stop valves are fully open. Check the voltage supplied to the outdoor and indoor units, please cinfirm that is 230V. Wiring Error Check This product is capable of automatic checking of wiring error. CN2 CN3 Switch on all the 4 dip-switches on the outdoor unit small service PC-board as shown on the right. Then power off the unit and power on again, the system will enter the operation of "Wiring Error Check". After 3 minutes stand-by, the unit starts for automatic wiring checking. Approximately 30 ~ 50minutes (depends on how many units installed in the system) after the unit starts, the CN4 ON SW1 1234 CN1 Errors of the wiring will be shown by the LEDs (1 to 5). 1 2 3 45 During this operation, the digital-number will alternately show the compressor working frequency (e.g. 50 stands for the current running frequency) and letter "CH"(means checking). After this operation, if all the wiring is correct, the digital-number will show "0", if there has wrong wiring, the digital-number will show "EC"(error connection) and also it will flashing. The service monitor LEDs indicate the error of wiring, as shown in the table below. For details about how to read the LED display, refer to the service manual. If self-checking is not possible, check the indoor unit wiring and piping in the usual manner. Status Test running. 1) If the temperature is lower than 16 OC, it is impossible to test cooling with remote controller, and also when the temperature is higher than 30 OC, it is impossible to test heating. 2) To test cooling, set the lowest temperature at 16 OC. To test heating,set the highest temperature, at 30 OC. 3) Please check both cooling and heating operation of each unit individually and then also check the simultaneous operation of all indoor units. 4) After ruuning the unit for about 20 minutes, check the indoor unit outlet temperature. 5) After the unit is stopped, or working mode changed, the system will not start again for about 3 minutes. 6) During cooling operation, frost may ocur on the indoor unit or pipes, this is normal. 7) 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 runing, 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.32 failure, that is indoor and outdoor communication error. CN2 CN4 CN3 ON SW1 1234 CN1 Communication LED 1 2 3 45 5 green LED means 5 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. -48-