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8 MICROPROCESSOR CONTROL
● 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)
● Autovane’s angle setting.
● Booster heater ON-OFF Control.
● 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.orders.
OUTPUT to remote controller
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.
OUTPUT to outdoor unit
12VDC
Non-polar, two-wire cable
maxinmum length 500 meters
Signal
Remote controller
● LCD indicator
Polar three-wire cable
12VDC
1 2 3
1
2
3
Indoor
unit
Outdoor unit
MITSUBISHI ELECTRIC
-CENTRALLY CONTROLLED-
STAND BY
DEFROST
ON
CHECK DRY
COOL
HEAT
CHECK
SET TEMP
TIMER OFF
AUTO STOP
AUTO START
F
HR
F
LOW HIGH
AUTO RETURN
CHECK TEST RUN
POWER
ON/OFF
HEAT
SET
TEMPERATURE
AUTO COOL/DRY
COOLERWARMER
TIMER MODE HOURS
FAN SPEED LOW/HIOGH
AIR
DISCHARGE
UP/DOWN
SWING
STOP
CHECK TEST RUN
OC120--1.qxp 24/6/97 12:22 AM Page 30