Sharp AY-XPC18LR Service Manual page 15

9. Peak control
If the current flowing in the air conditioner exceeds the peak control
current (see the table below), the operation frequency is decreased
until the current value drops below the peak control current regardless
of the frequency control demand issued from the indoor unit based on
the room temperature.
Peak control current
Cooling operation
AY-XPC18LR Approx. 9.5 A
AY-XP24LR Approx. 15.0 A
10. Outdoor unit fan delay control
The compressor stops immediately after cooling, dehumidifying or
heating operation is shut down, but the outdoor unit fan continues
operation for 50 seconds before it stops.
11. Defrosting
11.1. Reverse defrosting
The defrost operation starts when the compressor operating time
exceeds 20 minutes during heating operation, as shown below, and
the outside air temperature and the outdoor unit heat exchanger tem-
perature meet certain conditions. When the defrost operation starts,
the indoor unit fan stops. The defrost operation stops when the out-
door unit heat exchanger temperature rises to about 10°C or higher or
the defrosting time exceeds 10 minutes.
20 min or more 20 min or more
Start of
heating
Defrosting
operation
Max. 10 min
12. ON timer
The ON timer can be activated by pressing the ON timer button. When
the ON timer is activated, the operation start time is adjusted based on
fuzzy logic calculations 1 hour before the set time so that the room
temperature reaches the set temperature at the set time.
13. OFF timer
The OFF timer can be activated by pressing the OFF timer button.
When the OFF timer is set, the operation stops after the set time.
When this timer is set, the compressor operating frequency lowers for
quieter operation, and the room temperature is gradually varied after
one hour (reduced 1°C three times (max. 3°C) in heating, or increased
0.3°C three times (max. 1°C) in cooling or dehumidifying operation) so
that the room temperature remains suitable for comfortable sleeping.
Heating operation
Set temperature
Activation of 1 hour
OFF timer later
Cooling/dehumidifying operation
O
0.3 C
Set temperature
1 hour
Activation of
later
OFF timer
Heating operation
Approx. 13.0 A
Approx. 15.0 A
20 min or more
Defrosting
Max. 10 min
O
-1 C
O
-1 C
O
-1 C
Max. Max. Timer setting
1.5 hours 2 hours reached
later later
O
0.3 C
O
0.3 C
Max. Max. Timer setting
1.5 hours 2 hours reached
later later
14. Power ON start
If a jumper cable is inserted in the location marked with HAJP on the
indoor unit control printed circuit board (control PCB), connecting the
power cord to an AC outlet starts the air conditioner in either cooling or
heating mode, which is determined automatically by the room temper-
ature sensor.
When a circuit breaker is used to control the ON/OFF operation,
please insert a jumper as described above.
15. Self-diagnostic malfunction code display
15.1. Indoor unit
1) When a malfunction is confirmed, all relays turn off and a flashing
operation LED.timer LED.Plasamacluter LED is displayed to indi-
cate the type of malfunction.
When the air conditioner is in non-operating condition, holding
down AUX button for more than 5 seconds activates the malfunc-
tion code display function.
The operation continues only in the case of a serial open-circuit,
and the main relay turns off after 30 seconds if the open-circuit con-
dition remains.
In the case of a serial short-circuit, the air conditioner continues
operating without a malfunction code display, and the main relay
turns off after 30 seconds if the short-circuit condition remains.
The malfunction information is stored in memory, and can be
recalled later and shown on display.
2) The self-diagnostic memory can be recalled and shown on the dis-
play by stopping the operation and holding down AUX button for
more than 5 seconds.
(For details, refer to the troubleshooting section.)
15.2. Outdoor unit
If a malfunction occurs, LED1 on the outdoor unit flashes in 0.2-sec-
ond intervals as shown below.
(Example) Compressor high temperature abnormality
ON
OFF
1 sec 1 sec 0.6 sec
16. AUXILIARY MODE
Use this mode when the remote control is not available.
To turn on, lift the open panel of the indoor unit and press the AUX but-
ton.
• The unit start operating the AUTO mode.
• The fan speed and temperature setting are set to AUTO.
To turn off, press the AUX button again.
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AYXPC18LR