Hitachi airCore 700 Installation & Maintenance Manual page 51

Item Phenomenon
Zone control menu
can display on
the Wired Remote
Controller home
4
screen normally,
but damper does
not work or not
work properly.
Thermostat screen
5 is blank and cannot
be operated.
Check
Whether the Zone Interface Box is
powered or the communication
between Zone Interface Box and Wired
Remote Controller is abnormal?
Any loose of the connection port
between main board and relay board?
Is there proper connection between
the zone damper motor and the Zone
Interface Box?
Is damper motor faulty?
Is the action time (switching time from
fully open to fully closed) of all dampers
motors consistent?
The connected damper motor
specification does not meet the
requirements of the installation manual.
Is the damper interface on the relay
board shorted?
Is the relay input voltage normal?
Is the output voltage of the detection
relay normal under normal transformer
output?
Check if the input and output ports of
the transformer are loose or damaged?
Is the transformer output port detected
24V?
Is the power supply turned ON?
Is power wire correctly connected to
Zone Interface Box?
Is power voltage within the applicable
range?
Is communication wire correctly
connected to Zone Interface Box?
Melted fuse or activation of breaker at
power supply.
Short circuit supplied between wires.
Short circuit of wires to earth.
Melted fuse for control circuit?
Short circuit supplied between wires.
Short circuit of wires to earth.
Disconnected wire to each PCB.
Failure of each PCB.
INSTALLATION & MAINTENANCE MANUAL
Reset power to the system for 30
seconds or longer. After 3 minutes,
check whether the Wired Remote
Controller can display the zone control
window. If not, please refer to item1 for
troubleshooting.
Check the interface and reconnect.
Check wiring connection and reconnect.
Please replace damper motor.
Please replace damper motor.
Please select the correct damper motor.
Relay board failure, please replace Zone
Interface Box.
Main board failure, please replace Zone
Interface Box.
Relay board failure, please replace Zone
Interface Box.
Reconnect the transformer input and
output ports or replace Zone Interface
Box.
If the input voltage is normal, no output
voltage indicates that the transformer is
damaged, replace Zone Interface Box.
Turn ON the power supply.
Ensure the power wire is correctly
connected to Zone Interface Box. Ensure
the power wire is turned off to perform
wiring work.
Check the voltage on the power supply.
Check and rectify if the voltage is out of
"normal range" (AC 230V±10%).
Correctly connect communication wire
to Zone Interface Box.
Rectify cause of short circuit and replace
fuse.
Rectify cause of short circuit and replace
fuse or Zone Interface Box.
Correctly connect wires.
Replace PCB if faulty.
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Action