10
7. Installing the grille
7.1. Checking the contents
• This kit contains the following parts.
Accessory name
Q’ty
Remark
1
Grille
1
2
Screw
6
M5
×
0.8
×
16
3
Screw
1
4
×
16
7.2. Checks before setting in place
• Before installing the front panel, make sure the indoor unit is square with the ceiling
opening (or parallel to the angle between the wall and the ceiling).
• Check that the four points where the front panel will be secured are in contact with
the ceiling surface (see Fig. 7-1).
• Check that the insulation for the refrigerant pipes, drainage pipes, etc. is in place
and that wiring connections and arrangements are complete.
1
2
3
A
Points for securing the grille
B
Points for securing the grille
C
Indoor unit
D
Ceiling surface
E
Drainage pan
F
Places for securing front grille
G
Make sure these surfaces are
flush with each other (0-3 mm).
Fig. 7-1
• On wired remote controller
Check code displayed in the LCD.
• If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.
Symptom
Cause
Wired remote controller
LED 1, 2 (PCB in outdoor unit)
PLEASE WAIT
PLEASE WAIT
→
Error code
Display messages do not appear even
when operation switch is turned ON
(operation lamp does not light up).
For about 2
minutes following
power-on
After about 2
minutes has
expired following
power-on
After LED 1, 2 are lighted, LED 2 is turned off,
then only LED 1 is lighted. (Correct operation)
Only LED 1 is lighted.
→
LED 1, 2 blink.
Only LED 1 is lighted.
→
LED 1 blinks twice,
LED 2 blinks once.
• For about 2 minutes following power-on, operation of the
remote controller is not possible due to system start-up. (Cor-
rect operation)
• Connector for the outdoor unit’s protection device is not con-
nected.
• Reverse or open phase wiring for the outdoor unit’s power
terminal block (L1, L2, L3)
• Incorrect wiring between indoor and outdoor units (incorrect
polarity of S1, S2, S3)
• Remote controller wire short
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED 1, 2, 3) provided on the indoor controller, refer to the following table.
LED 1 (power for microcomputer)
Indicates whether control power is supplied. Make sure that this LED is always lit.
LED 2 (power for remote controller)
Indicates whether power is supplied to the remote controller. This LED lights only in the case of the
indoor unit which is connected to the outdoor unit refrigerant address “0”.
LED 3 (communication between indoor and outdoor units)
Indicates state of communication between the indoor and outdoor units. Make sure that this LED is
always blinking.
[Output pattern B]
Errors detected by unit other than indoor unit (outdoor unit, etc.)
Check code
Symptom
Remark
E9
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP
Compressor overcurrent interruption
U3, U4
Open/short of outdoor unit thermistors
UF
Compressor overcurrent interruption (When compressor locked)
U2
Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1, Ud
Abnormal high pressure (63H worked)/Overheating safeguard operation
U5
Abnormal temperature of heat sink
U8
Outdoor unit fan safeguard stop
U6
Compressor overcurrent interruption/Abnormal of power module
U7
Abnormality of super heat due to low discharge temperature
U9, UH
Abnormality such as overvoltage or voltage shortage and abnormal synchronous
signal to main circuit/Current sensor error
–
–
–
–
Others
Other errors (Refer to the technical manual for the outdoor unit.)
6. Test run
For details, check the LED display
of the outdoor controller board.
A
B
C
F
G
E
D
