U-Match Series DC Inverter Service Manual 
28 
4 OPERATION INSTRUCTION OF SPECIAL 
FUNCTIONS 
4.1 Setting of Filter Clean Reminder Function 
When unit is on, press Function button to switch to filter clean reminder function. The    icon 
will blink and then enter setting of filter clean reminder function. Timer zone displays the set pollution 
level and you can press ▲ or ▼ button to adjust the level. Then press Enter/Cancel button to turn on this 
function. 
When filter clean reminder  function is  turned on, press  Function  button to  switch to filter  clean 
reminder function. The    icon will blink and press ▲ or ▼ button to adjust timer zone to display 
“00”. Then press Enter/Cancel button to cancel this function. 
Setting of filter clean reminder function is shown as Figure 2-4-1 below:   
 
 
Figure 2-4-1 Setting of filter clean reminder function