Service manual

21
MICROPROCESSOR CONTROL
9
● Compressor and
outdoor fan : ON-
OFF
● Operation mode
change :COOL-
HEAT.
1.OUTLINE OF MICROPROCESSOR CONTROL
● OFF-ON switching.
● COOL/DRY-AUTO-HEAT selector switching.
● Thermostat setting.
● TIMER mode selector-switching and Timer
setting.
● HIGH-LOW fan speed switching.
● AUTO Vane selector (AIR DISCHARGE)
switching.
● TEST RUN switching.
● CHECK mode switching.
(Self diagnostic trouble shooting)
● Room temperature thermistor (RT1)
● Indoor coil thermistor (RT2)
● Drain sensor
● Autovane’s angle setting.
● Booster heater ON-OFF Control.
● Drain pump : ON-OFF.
● Emergency stop.
● Compressor protection-
device working
● Defrosting
START-STOP
● Fan speed control.
● Crankcase heater control
ON-OFF.
● Self diagnostic function
Independent Control of
Outdoor Unit
OUTPUT to indoor unit
INPUT from indoor unit
INPUT to remote controller
Remote controller board
● Processes and transmits
orders.
OUTPUT to remote controller
Indoor controller board
● Receives orders from remote controller and
temperature data from indoor unit.
● Processes orders and data.
● Controls indoor and outdoor operation.
● Self diagnostic function.
w System control operation.
w Emergency operation.
w Set by dipswitch on indoor controller board.
● Transmits the power to remote controller.
OUTPUT to outdoor unit
12VDC
Non-polar, two-wire cable
maxinmum length 500 meters
Signal
Remote controller
● LCD indicator
Polar three-wire cable
12VDC
123
1
2
3
Indoor
unit
Outdoor unit
FILTER
CHECK MODE
TEST RUN
240KA