Daikin VAM 500EJ, Service Manual

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Circuit Operations Si-93
28 Circuit Operations
1.2 Circuit Functions
Classification Circuit Function
Input/output Central data transmission interface Used by centralized control equipment for
operation control. Allows control of up to 64
groups of air conditioners and heat reclaim
ventilation units. Use of KRP2A61 allows zone
link operation.
Remote control data transmission interface Use of dedicated LCD remote controller allows
control of up to 16 heat reclaim ventilation
units. Also used for linked operation of air
conditioners of 2 groups.
Air conditioner link operation Connects to remote control line of air
conditioner for linked operation.
Output KRP50-2 interface Can be used to output signals of operating
condition and abnormalities to external
equipment or to connect humidifier via KRP50-
2.
Relay drive circuit Supplies drive voltage to relay coils.
Fan motor, damper motor relay Power supply relay for fan motor and damper
motor.
Input Thermistor interface Uses thermistor (temperature sensor) to detect
inside and outside temperatures.
Airflow rate setting switch interface Used to set airflow rate of main unit when
dedicated remote controller is not used.
External input interface Used to control main unit with external contact
point. (Freshup, external link operation, etc.)
Damper limit switch interface Sends signal of limit switch condition to
microcomputer for damper motor cam
positioning.
Peripheral
Parts Control microcomputer Controls entire equipment by varying output
according to input condition.
EEPROM Stores operating condition and address data.
Microcomputer Microcomputer reset circuit Resets microcomputer when power is turned
on.
Microcomputer oscillation circuit Generates clock frequency for microcomputer
operation.
Power Supply Power transformer Produces power supply of approx. 26 VAC
from 220-240 VAC.
Power supply circuit Supplies direct currents (16 VDC, 5 VDC) to
control circuits.