Sharp AY-XP08CE Service Manual page 19

1-14 Indoor/outdoor temperature display
Every time the Temperature check button is pressed
on the remote control, the display changes in the
o r d e r o f i n d o o r t e m p e r a t u r e
temperature no display. The temperature is
displayed on the temperature indicator on the main
unit to be referred to for energy saving.
(When the unit is not running, the display changes
between indoor temperature and no display.)Indoor
temperature is the temperature of the suction air
measured by the room thermistor, and outdoor
temperature is that measured by the outdoor
temperature thermistor. When indoor temperature is
displayed, the indoor LED on the main unit is lit, and
when outdoor temperature is displayed, the outdoor
LED is lit. For 90 seconds after the operation starts,
- - is displayed instead of the actual outdoor
temperature since it is still being measured.Because
of the effect of the exchanger, the unit cannot
confirm the exact indoor temperature right after the
operation is terminated. Therefore, for one hour
s i n c e t h e o p e r a t i o n i s s t o p p e d , t h e i n d o o r
temperature immediately before the operation is
stopped is displayed. After over one hour since it is
stopped, the unit displays the actual room
temperature at that point.
1-15 Error diagnostic display
(a) Indoor unit
(1) When an error is detected, all relays are turned
off. At the same time, the details of the error are
displayed by flashing the number corresponding
to the type of the error. The details can also be
displayed by pressing down the emergency
operation switch for 5 seconds or more in the
state of operation stop.However, if the operation
is continued only in the serial open state and the
state remains unchanged after that, the main
relay is turned off in 8 minutes. In the serial short
state, the error is not displayed and the
operation is continued. If the unit stays in the
same state, the main relay is turned off in 8
minutes. Although the error is not displayed, it is
memorized and can be displayed when it is
recalled.
(2) If the operation is stopped and the emergency
operation button is pressed down for 5 seconds
or more, the self-diagnosis memory can be
recalled.
(3) Details of self-diagnosis (error mode) are
informed by the flashing number as well as the
lighting pattern of the operation lamp which
flashes with the timer lamp.(For details, refer to
Error diagnostic method.)
1-16 Compressor relay
(1) It is ON during operation, and when operation is
stopped, goes OFF after a delay of 100 seconds
(not immediately).
Air conditioner
operation
Compressor
relay
o u t d o o r
ON
OFF
ON
OFF
100 sec.
(2) The minimum OFF time of the relay is 80 seconds.
It will not go ON again before 80 seconds elapses.
Air conditioner
operation
Compressor
relay
(3) If air conditioner operation is turned on again
during the 100 second delay before the compressor
relay goes off, the compressor relay will stay on.
Air conditioner
operation
Compressor
relay
2. DESCRIPTION OF ODOR SENSOR
(1) Outline of the odor sensor
The odor sensor is used to cluster display during
operation. This odor sensor sensitively reacts to
the various air contaminations such as a volatile
organic solvent, fragrant materials and tabacco
burning gas. In the figure on the right, RS
indicates a sensor resistance, RL a load
resistance, VRS a sensor output voltage, and
VC a sensor power supply voltage. Their relation
is expressed in the following formula.
When the air contamination level increases, the
value of the sensor resistance RS drops, which
also lowers the value of the sensor output voltage.
Basic circuit
R66
C32
Microcomputer
output
Microcomputer
input
V
RS =
While detecting contamination, the microcomputer
outputs the following pulse to the transistor Q8,
which drives the heater with the built-in odor sensor
using the pulse.
512(µs)
12.8(ms)
19
ON ON
OFF
ON
ON
OFF
100 sec. 80 sec.
ON ON
OFF
ON
100 sec.
5V
Odor sensor
Q8
V
C
3
RL
R65
2
R64
R41
1
R
S
C31
Q7
V
RS
R52
R
S
V
C
R R
L + S
AY-XP08/10/13CE
AE-X08/10BE-C
AE-X13BE