Air and Health
Air and Health
Yellow dust refers to the phenomenon of dust and soil from the yellow earth region in the valley of the Yellow River and desert region of China and Mongolia floating in the wind and falling down to the ground to cause visibility impairment mainly during springtime, the dry season.
When yellow dust phenomenon occurs, it causes clouding of visibility and change of sky into yellowish brown color, thus results in deterioration of visibility and building up of fine yellow dust particles on human body and objects. Yellow dust, when generated in desert region, mainly consists of quartz (silicon) and, when generated in yellow earth region, largely made up of aluminum contents. However, in the recent times, the wind containing yellow dust passes through the upper air of industrial zone in China, thus delivers pollutants of heavy metals or sulfurous acid gas. As such, yellow dust is causing serious environmental pollution in the recent days.
Damages of Yellow Dust
Yellow dust phenomenon blocks out and diffuses sunlight to impair visibility. Thus, it blocks the pores of agricultural crops or
In addition, it may cause problems in precision machinery, such as semiconductors and aircrafts, etc, thus result in significant damages to them. The ill effects of yellow dust on human body include bronchitis and asthma, etc. by penetrating deep into the respiratory organ and conjunctivitis and xerophthalmia, etc. by getting in contact with eyes. However, as yellow dust contains a large quantity of alkaline contents, it neutralizes acidic pollutants even after it falls down to the ground. Therefore, it also has the positive effect to assist in prevention of acidifying rainwater on the inland area.
Before Requesting for After Sale Service 
Please check the followings before requesting for after sale service.
Even if product is not out of order, air purifier may not operate properly due to insignificant causes or user’s unfamiliarity with handling the product. In such cases, check for the following symptoms and corrective measures to solve simple troubles without the help of our service center.
If the problem is not solved after checking the followings, please contact our service center.
Symptom | Please Check | Measures to Take |
| � Is power cord plugged? | Plug power cord into |
Wind is not | � Is display panel turned off? | 120V~ power outlet. |
coming out. | Turn power switch on and select | |
|
| switch for desired function. |
| � Check for the status of | Operate product after power is |
| power failure? | back on. |
| � Is filter cover closed? | Properly close filter cover. |
| � Is the position of swing | Turn off power and turn it on |
| grill correct? | again before use. |
Airflow does | � Is mode indication lamp | Airflow selection cannot be made |
not change. | turned on? | unless in manual operation mode. |
| (Status normal) | |
|
| |
| � Is the room dark? | Airflow selection cannot be made |
|
| during sleep mode operation. |
|
| (Status normal) |
Strength of | � Has the time for filter cleaning or | Replace or clean filter. |
wind has | replacement passed? |
|
significantly |
|
|
weakened. |
|
|
Caution
How to Use Self Diagnosis
Pollution level does not change. 
�Is there dust built up in the lens of dust pollution detection sensor?
�Is the pollution level continuously displayed high?
�Is the pollution level continuously displayed low?
Remove dust. (Refer to page 25.)
Adjust sensitivity of dust pollution detection sensor to low.
(Refer to page 24.)
Adjust sensitivity of dust pollution detection sensor to high. (Refer to page 24.)
Customer Service
27
Other performance-
related | � After checking symptoms, unplug power cord and make inquiries |
defects | or request for after sale service. |
28