AH/AY-AP18DR
AH/AY-AP24DR
22
7.
Current control
This system, in order to prevent overcurrent
during heating operation, controls the outdoor fan
motor and changes the indoor fan motor speed by
detecting total current. When the current exceeds
P2, the outdoor fan motor is automatically turned
off, and when the current falls below P4, the
outdoor fan motor is turned on.
When the current exceeds P3 and the indoor fan
speed shifts down because of cold air (5. Preheat
air flow), the changes in the indoor fan speed
shifts up as follows, from "off" to "HUL", or from
"HUL" to "HL". And when the current falls bellow
P5, the indoor fan speed shift up is canceled.
Figure Y-10
8.
Freeze preventive
When the indoor pipe temperature falls below 0˚C
during cool operation or dry operation, the
compressor is turned off.
9.
Defrost
The defrost timer (integrating the operation time of
compressor) counts time with microcomputer
during heat operation.
Frost of outdoor pipe is estimated by indoor pipe
temperature (TH2), room temperature (TH1),
indoor fan speed and operation state of
compressor.
In the defrost operation, first the compressor is
turned off, the fan speed is set to “HUL” and the
outdoor fan motor is turned off.
30 seconds later the indoor fan motor is turned
off, 60 seconds later the reverse valve is turned
off, and the compressor is turned on. In the end of
defrosting, the compressor is turned off, the
outdoor fan motor is turned on, 60 seconds later
the reverse valve is turned on, and the
compressor is turned on, starting heat operation.
At this time, the indoor fan motor is turned off or
the fan speed is set to “HUL” if preheat air flow
function is effective.
Figure Y-11
Figure Y-12
10.
Delayed operation of the reverse valve
the heat operation is shut down or the operating
mode is switched from heat to cool or dry, or vice
versa, the reverse valve is switched after 3
minutes.
11.
Test run
If the "AUX" button on the unit is pressed for 5
seconds or more during operation, cool test
operation starts. The operation LED (red) flickers
during test run.
To put the system in the heating test run mode,
start the cooling operation and select the heating
mode on the remote control. In cool and heat
mode continuous compressor on operation is
performed. In dry mode the operation is in
dehumidifying zone. In fan only mode the indoor
fan motor runs continusly.
12.
Timer
12-1 ON/OFF TIMER
When the unit operates during one hour after the
OFF-time is set, thermostat setting is
automatically shifted (+1˚C in cool operation and
dry operation, -3˚C in heat operation, 16˚C -
32˚C). When the ON-timer is set in heat operation
and cool operation, operation starts before 0 to 30
minutes(depends on the room temperature) so
that preset temperature is obtaind at set time.
12-2 ONE-HOUR TIMER
When ONE-HOUR timer is set, the unit turns off
automatically after one hour. The one hour timer
operation has priority over other time operation,
such as the TIMER ON and TIMER OFF. If the
ONE-HOUR TIMER button is pressed again
during operation, the unit will operate additionally
for another one hour.
Outdoor
Fan motor
OFF
Indoor
Fan motor
Shift UP
Compressor
OFF
Time
Input current
Current transition
P1 19.0A 22.8A
P2 13.5A 18.1A
P3 12.8A 16.9A
P4 12.4A 16.8A
P5 12.0A 16.0A
AY-AP18DR AY-AP24DR
Switch ON
Heating
Heating
Heating
Min.
40min.
Max.
12min.
Min.
30min.
Max.
12min.
Defrost
Defrost
Defrost start
Compressor
Reverse
Valve
Outdoor
Fan Motor
Indoor
Fan Motor
Preheat Air
Flow Control
30sec.
MAX. 7min.
60sec.
60sec.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
60sec.
HUL
