Mitsubishi Electronics PCH42GK, PCH24GK, PCH36GK, PCH30GK Microprocessor Control, OC277-27

9

MICROPROCESSOR CONTROL

1.OUTLINE OF MICROPROCESSOR CONTROL

INPUT to remote controller Remote controller board OUTPUT 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)

●Processes and transmits orders.

Remote controller

●LCD indicator

TIMER OFF TIMER	CLOCK AUTO AUTO	FAN
CHECK SET TEMP.	START STOP	SPEED	FILTER
		AUTO	CHECK MODE
		RETURN

TEST RUN

Indoor
unit	12VDC

Non-polar, two-wire cable maximum length 550 yards

Signal

INPUT from indoor unit

●Room temperature thermistor (RT1)

●Pipe temperature thermistor (RT2)

OUTPUT to indoor unit

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.

wSystem control operation.

wEmergency operation.

wSet by dip switch on indoor controller board. ● Transmits the power to remote controller.

1 2 3

●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

Polar three-wire cable

Outdoor unit

12VDC

1

2

3

OUTPUT to outdoor unit

●Compressor and outdoor fan : ON-

OFF

●Operation mode change :COOL- HEAT.

OC277-27