General Information - Fujitsu ASTH18KNTA Operation Manual

1. Wipe the indoor unit body gently with a soft cloth moisten
with warm water.
2. Wipe the indoor unit body gently with a dry and soft cloth.
Cleaning air fi lter
1. Open the intake grille.
2. Remove the air fi lters.
Lift up the air fi lters' handle, disconnect the two lower tabs, and pull
out.
Air fi lter handle
Hooks (2 places)
3. Remove the dust in either of the following ways.
• Cleaning with vacuum cleaner.
• Washing with mild detergent and warm water. After washing, dry the
air fi lters thoroughly in shade.
4. Replace the air fi lters.
Align the sides of the air fi lter with the panel, and push in fully.
Make sure to the two lower tabs are returned to their holes in the
indoor unit properly.
5. Close the intake grille.
Press 4 places on the intake grille to close it completely.
NOTE: If dirt accumulates on the air fi lter, airfl ow will be reduced,
operating effi ciency will lower, and the noise will increase.
Removing and installing intake grille
■ Removing intake grille
1. Open the intake grille.
2. While pressing the left and right mounting shafts outward
gently, pull the intake grille.
■ Installing intake grille
1. While holding the intake grille horizontal, set the left and
right mounting shafts into the pillow blocks at the top of the
front panel.
Insert the shaft until it snaps to latch each shaft properly.
2. Close the intake grille.
3. Press 4 places on the intake grille to close it completely.
After extended non-use of the unit
If you have shut down the indoor unit for 1 month or more, perform the
Fan mode operation for half a day to dry the internal parts thoroughly
before the normal operation.
Additional inspection
After long period of use, accumulated dust inside the indoor unit may
reduce the performance even if you have maintained the unit properly.
In such a case, a product inspection is recommended.
For more information, consult authorized service personnel.
Filter indicator reset (Special setting)
This function can be used if set correctly during installation. Consult
authorized service personnel in order to use this function.
  Clean the air fi lter when the indicator lamp shows the
following:
Indicator lamp
Blinks 3 times, at intervals of 21 seconds
After cleaning, reset the fi lter indicator by pushing
for 2 seconds or less. (Refer to page 3.)

11. GENERAL INFORMATION

■ Heating performance
This air conditioner operates on the heat-pump principle, absorbing
heat from air outdoors and transferring that heat to the indoor unit. As a
result, the operating performance is reduced as outdoor air temperature
drops.
If you feel that the heating performance is insuffi cient, we recommend
you to use this air conditioner in conjunction with other kinds of heating
appliance.
■ Automatic defrosting operation
When outdoor temperature is very low with high humidity, frost may
form on the outdoor unit during the heating operation, and it could
reduce the operating performance of the product.
For frost protection, an automatic defrost function is equipped in this air
conditioner.
If frost forms, the air conditioner will temporarily stop, and defrost circuit
will operate briefl y (maximum of 15 minutes.)
[ ] indicator on the indoor unit blinks during this operation.
If frost forms on the outdoor unit after the Heating operation, the outdoor
unit will stop automatically after it operates for a few minutes. Then the
Automatic defrosting operation starts.
■ Auto-restart function
In event of power interruption such as a blackout, the air conditioner
stops once. But it restarts automatically and performs previous operation
when the power supply is resumed.
If any power interruption occurs after the timer is set, counting down of
the timer will be reset.
After the power supply is resumed, [
blinks to notify you that there has been a timer fault. In such a case,
reset the clock and timer settings.
En-8
Blinking pattern
on the indoor unit
] indicator on the indoor unit