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Sharp AY-A079E Service Manual page 11

Split system room air conditioners
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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 more than
8 minutes according to the room temperature (the time
increases with a rise of room temperature) when 3
minutes elapse after turning on the compessor.
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
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
Figure Y-8
3 min.
3 or 8 or 15min.
(Notes)
(Notes)
UL
30sec.
10sec.
10sec.
time
Preset
OFF
UL
UL
Fan speed
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 U1˚C, the
outdoor fan motor is turned off, and when the indoor
pipe temperature falls U2˚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 U1˚C,
OFF
U1
U2
Within 3 minutes
Fan
Speed
MODELS
Line
U1
AY-A079E
U2
U1
AY-A099E
U2
11
OFF
ON
U1
ON
U2
Over 3 minutes
Figure Y-9
Table Y-3
M
L
UL
53˚C
53˚C
53˚C
49˚C
49˚C
49˚C
53˚C
54˚C
54˚C
49˚C
50˚C
50˚C
AY/AE-A079E
AY/AE-A099E

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