GE ASYW09CRAWA Service Manual Download

Page: 22 / 80

SEQUENCE of OPERATION

PAGE

ENGLISH

Defrost

Indoor Unit

Temperature Sensors

Communication

Outdoor Unit

Temperature Sensors

When the system initiates a call for defrost, the indoor fan

motor stops. The indoor unit display will not change.

The system will cycle through the defrost operation.Any

indoor unit malfunctions will be ignored until the compressor

restarts and has been operating for 30 seconds.At the

conclusion of the defrost cycle, the indoor fan will enter the

cold air proof operationand heating resumes.

To enter the heat mode, point the infrared remote controller

at the unit and press the power button, then press the HEAT

mode button if not already set.

The louver stepper motor to open the louver to a stationary

position.

The indoor and outdoor units main boards communicate via

the wire connected to terminal 3 of each unit.A splice or break

in this wire will cause a communication error.

Upon a request for heat, the PCB applies power to the 4-way

valve,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.
NOTE: Do not measure compressor voltages , damage to the

meter may result.
If the room temperature is above the set temperature,yet lower

than 2°F above the set temperature, the system will adjust the

running frequency of the compressor automatically.
The PCB also controls the position of the

EEV (Electronic Expansion Valve)

to regulate the flow of refrigerant to the indoor unit evaporator

coil.

Four sensors provide temperature information to the main board

for control of the system during heat mode.
The ambient sensor provides the temperature of the air drawn

into the evaporator coil.
The defrost temperature sensor provides the temperature

sensed at the output of the evaporator coil.
The suction line sensor provides the temperature

sensed at the incoming suction line pipe.

The PCB will illuminate the display, indicating the temperature

and current status.

The louver opens to the lowest downward position, then the

fan motor starts after the coil has warmed to a sufficient

temperature (cold air proof operation). The PCB sends the

motor information to monitor the speed if in the AUTO mode,

or returns the motor to the fixed speed set previously.

The room (ambient) and coil sensors are used to maintain

the system at the temperature desired. The resistance values

of the sensors can be verified using the temperature-to-

resistance charts found in this manual.

Call to Terminate Heating

The compressor discharge sensor provides the temperature
sensed at the discharge pipe of the compressor.

The system will call to terminate heating when the temperature
is equal to or higher than 2°F above the set temperature.
The PCB
will de-energize
the compressor. The outdoor fan will run for 60 seconds
before stopping, and 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

Dry Mode

Overview

(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.

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

When Tr < Ts + 3.6°F, Light speed

controller.
If the outdoor fan is stopped, the indoor fan will pause for 3
minutes.If the outdoor fan is stopped for more than3 minutes,
and the compressor is still operating, the sindoor fan will change
to low speed mode.

Dry mode helps remove excess moisture from the room
during periods of high humidity.