AE-XM24CR (serv.man8). Functions - Sharp Air Conditioner Service Manual (repair manual). Page 4

34

(2) Dust detection by using the sensor

The output voltage from the optical allergen sensor is input into the indoor unitÅfs microcomputer to detect the air
contamination (dust). This method inputs the sensor voltage per unit of time and calculates the relative fluctuation
to determine whether the air is contaminated or not.

(3) Operation of the indoor unit's microcomputer

As with the odor sensor, the indoor unitÅfs microcomputer starts constantly detecting the air contamination level
after 1 minute of the operation start.

(4) Switching sensitivity of the optical allergen sensor

The sensitivity can be adjusted. However, both sensors will be adjusted to the same level. The air contamination is
detected in the following seconds at each sensor level.

Clean

Contaminated

Determined 
clean

Determined 
contaminated

Reference 
value

High (2 sec.)
Med (3 sec.)
Low (4 sec.)

15k

Ω

15k

Ω

13k

Ω

13k

Ω

R7

R6