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8
MICROPROCESSOR CONTROL
1.OUTLINE OF MICROPROCESSOR CONTROL
INPUT to remote controller
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)
Indoor
unit
INPUT from indoor unit
Room temperature thermistor (RT1)
Indoor coil thermistor (RT2)
OUTPUT to indoor unit
Autovane's angle setting.
Booster heater ON-OFF Control.
Emergency stop.
Independent Control of
Outdoor Unit
Compressor protection-
device working
Defrosting
START-STOP
Fan speed control.
Crankcase heater control
ON-OFF.
Self diagnostic function
30
Remote controller board
Processes and transmits
orders.orders.
Indoor controller board
Receives orders from remote controller and tem-
perature 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.
1 2 3
Polar three-wire cable
Outdoor unit
1
2
3
OUTPUT to remote controller
Remote controller
LCD indicator
-CENTRALLY CONTROLLED-
POWER
ON/OFF
STAND BY
DEFROST
ON
CHECK DRY
HEAT
AUTO
COOL/DRY
HEAT
COOL
CHECK
SET
WARMER
COOLER
SET TEMP
F
TEMPERATURE
TIMER OFF
TIMER
MODE
HOURS
AUTO STOP
AUTO START
HR
FAN SPEED LOW/HIOGH
LOW HIGH
AIR
SWING
UP/DOWN
DISCHARGE
F
AUTO RETURN
CHECK TEST RUN
CHECK
TEST RUN
MITSUBISHI ELECTRIC
Non-polar, two-wire cable
maxinmum length 500 meters
Signal
STOP
Compressor and
outdoor fan : ON-
OFF
Operation mode
change :COOL-
HEAT.
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