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Microprocessor Control - Mitsubishi Electric PCH-2GKHA Service Manual

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9

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)
Drain sensor
OUTPUT to indoor unit
Autovane's angle setting.
Booster heater ON-OFF Control.
Drain pump : ON-OFF.
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
26
Remote controller board
Processes and transmits
orders.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.
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
4
Non-polar, two-wire cable
maximum length 500 meters
Signal
FILTER
CHECK MODE
TEST RUN
Compressor and
outdoor fan : ON-
OFF
Operation mode
change :COOL-
HEAT.

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