Haier AW09TE1VHA, Service Manual

Page: 29 / 79

SEQUENCE of OPERATION PAGE 29
ENGLISH
Call to Terminate Heating
Auto Mode
Dry Mode
Overview
Indoor Unit
Temperature Sensors
Communication
Outdoor Unit
The compressor discharge sensor provides the temperature
sensed at the discharge pipe of the compressor.
The system will call to terminate heating when the indoor
ambient temperature sensor is equal to or higher than 2°F
above the room set temperature. The indoor control board
will communicate to the outdoor control board to de-energize
the compressor. The outdoor fan will run for 60 seconds
before stopping. The 4-way valve will de-energize 2 minutes
after the compressor stops.
To stop heat mode, press the power button to turn the system
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With the system turned on, press the AUTO button on the
remote control. The system will change to the auto mode of
operation.
As the room is cooled or heated, the system will automatically
switch between cool mode, fan mode, and heat mode.
There is a minimum 15 minute operating time between mode
changes.
The temperature control range in Dry mode is 60°F - 86°F.
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(Tr = room temperature Ts = set temperature)
When Tr > Ts + 4°F, the compressor will turn on and the indoor
fan will operate at the set speed.
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high dry frequency for 10 minutes, then at the HIGH DRY and
LOW DRY mode for 6 minutes. The indoor fan will operate at
LOW speed. When Tr < Ts, the outdoor unit will stop, and the
indoor fan will stop for 3 minutes, then operate at the LOW
speed option.
Automatic fan speed:
When Tr >= Ts + 9°F, HIGH speed
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When Tr < Ts + 3.6°F, Light speed
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controller.
If the outdoor fan is stopped, the indoor fan will pause for 3
minutes.
If the outdoor fan is stopped for more than 3 minutes, and the
compressor is still operating, the system will change to LOW
speed mode.
the indoor unit and press the power button, then press the
DRY mode button if not already set to dry mode.
The signals received by the infrared receiver are relayed to
the main board of the indoor unit to turn the system on and
set it to dry mode.
The indoor unit main board will illuminate the display,
indicating the room temperature and status.
The indoor unit main board will signal the louver stepper motor
to open the louver to either a stationary position or one
of several oscillating modes.
As the louver opens, the indoor unit main board will power up
the indoor fan motor, operating the fan at the speed last set.
The indoor fan motor has a feedback circuit which provides
the indoor unit main board with information for controlling
the speed of the fan motor.
The indoor unit has two sensors that provide temperature
information to the indoor unit main board.;The sensors: an
indoor ambient temperature sensor and coil temperature
sensor, are used for controlling the system during dry mode.
The resistance values of the sensors will vary with temperature.
The resistance to temperature values can be found
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being checked.
The indoor and outdoor unit main boards communicate via a
digital signal on the wire connected to terminal 3 of each unit.
A splice or break in this wire will cause a communication error.
When a command is received from the remote control, the
indoor unit main board communicates with the outdoor unit
main board via the terminal 3 wire to perform the requested
function.
Upon a request for dry mode, the outdoor unit main board
applies power to the outdoor fan motor
and compressor. Depending on system cycling, there may
be up to a 3 minute wait period before the compressor and
outdoor fan start.)
WARNING: Do not measure compressor voltages, damage to
the meter may result.
The outdoor unit main board also controls the position of the
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refrigerant to the indoor unit evaporator coil.