Microprocessor Control - Mitsubishi Electric PKH18FK1 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.
Swing louver switching.(AIR SWEEP)
TEST RUN switching.
CHECK mode switching.
(Self diagnostic trouble shooting)
Indoor
unit
INPUT from indoor unit
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
OUTPUT to indoor unit
Auto vane's angle setting.
Swing louver control ON-OFF.
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 tem-
perature data from indoor unit.
Processes orders and data.
Controls indoor and outdoor operation.
Self diagnostic function.
System control operation.
Emergency operation.
Set by dip switch on indoor controller board.
Transmits the power to remote controller.
1 2 3
Polar three-wire cable
Outdoor unit
1
2
3
OC193-29
OUTPUT to remote controller
Remote controller
LCD indicator
TIMER OFF TIMER CLOCK AUTO AUTO
FAN
CHECK SET TEMP. START STOP FILTER
SPEED
AUTO
CHECK MODE
RETURN
TEST RUN
Non-polar, two-wire cable
maximum length 550 yards
Signal
Compressor and
outdoor fan : ON-
OFF
Operation mode
change :COOL-
HEAT.