Sharp AY-M09AE Service Manual page 15

2-4 Fan only operation
The indoor fan motor always turns on.
3. Fan speed
Fan speeds are given by the indoor fan motor,
"H", "M", "L" and "UL" which are available in the
following operation mode.
Table Y-3
FAN Switch HEAT
HIGH H
LOW M
SOFT L
4. Hot-Keep
This function automatically controls the on-off operation
of the indoor fan motor in accordance with the on-off
operation of the compressor during the heating
operation, thereby preventing the air conditioner from
delivering a cold air when the compressor is off.
When the room temperature exceeds the thermostat
line "H1", the compressor is turned off, and the indoor
fan motor is turned off after rotating at "UL" for 30
seconds.
3 minutes after turning off the compressor, the
compressor is turned on for 3 minutes. (below
thermostat line H01). While over H01, the compressor
is off.
At 10 seconds after turning on the compressor, the
indoor fan motor is turned on.
The next compressor OFF time is for 3, 8 or 15 minutes
according to the room temperature (the time increases
with a rise of room temperature) when 3 minutes
elapse after turning on the compessor (the compressor
is off when compressor OFF time is 15 minutes).
3 min.
Compressor ON
OFF
ON
UL
Indoor
fan motor
OFF
30sec.
Thermo off
Notes: Compressor is off when compressor OFF time is 15 minutes.
Figure Y-7
COOL FAN ONLY
M M
L L
UL UL
3 min. 3 or 8 or 15min.
(Notes)
(Notes)
UL
30sec.
10sec. 10sec.
time
5. Preheat air flow
This function is intended to prevent cold air from being
discharged when the heating operation starts or when
defrosting.
When the indoor pipe temperature is below 29˚C at the
begining of the heat operation or after defrosting, the
indoor fan motor stays.
When the indoor pipe temperature gets higher than
29˚C, the fan motor is turned on at speed "UL" after
compensation of starting.
When the indoor pipe temperature exceeds 35˚C, the
specified fan speed is restored. When the indoor pipe
temperature falls below 30˚C, the fan speed shifts
down to "UL". And, when the indoor pipe temperature
falls below 24˚C, the fan motor turns off. Then, over
29˚C , it turns on again at speed "UL".
35
30
29
24
OFF
UL
6. Overheating protection system
When overloading occurs during the heating operation,
this system controls the outdoor fan motor according to
the indoor pipe temperature to prevent the overloading
of the compressor and restrain the rise in high pressure.
When the indoor pipe temperature exceeds 53˚C, the
outdoor fan motor is turned off, and when the indoor
pipe temperature falls 48˚C, the outdoor fan motor
turns on.
If 3 minutes elapse after turning off outdoor fan motor,
the outdoor fan motor is turned on, when the indoor
pipe falls 53˚C.
OFF
53˚C
48˚C
In the case of turn off
time is within 3 minutes
15
Preset OFF
UL
Fan speed
Figure Y-8
OFF ON
53˚C
ON
48˚C
In the case of turn off
time is over 3 minutes
Figure Y-8
AY-M09AE
AE-M18AE
UL