Microprocessor Control - Mitsubishi Electric PK12FK Technical & Service Manual

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
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
Remote controller board
Processes and transmits
orders.
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.
System control operation.
Emergency operation.
Set by dipswitch on indoor controller board.
Transmits the power to remote controller.
1 2
Polar three-wire cable
Outdoor unit
1
2
OUTPUT to remote controller
Remote controller
LCD indicator
-CENTRALLY CONTROLLED-
POWER ON/OFF
STAND BY
ON
DEFROST
CHECK DRY
HEAT AUTO COOL/DRY
HEAT COOL
CHECK SET
WARMER COOLER
SET TEMP F TEMPERATURE
TIMER OFF
AUTO STOP TIMER MODE HOURS
HR
AUTO START
LOW HIGH FAN SPEED LOW/HIOGH
AIR SWING
UP/DOWN
STOP
DISCHARGE
F
AUTO RETURN
CHECK TEST RUN CHECK TEST RUN
MITSUBISHI ELECTRIC
Non-polar, two-wire cable
maxinmum length 500 meters
Signal
Compressor and
outdoor fan : ON-
OFF
Operation mode
change :COOL-
HEAT.
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