Hitachi Central Station EX Installation Manual page 95

Item Phenomenon
3 Central Station EX
does not establish
connection with
extension adapter.
4 Air conditioning cannot
be controlled by
Central Station EX.
A12124820A
Check
Is LAN line correctly connected to Central
Station EX?
Is the power on HUB turned ON? (When
using,)
Does LAN wiring meet specification
requirement?
Is LAN cable free from disconnection, shortcut
and other problems? (When using,) also
check HUB conditions.
Isn't H-LINK wiring placed along with power
line?
Does the H-LINK LAN LED stay OFF?
Doesn't either ERROR LED, 7-segment LED
indicate as following?
ERROR LED State 7-segment LED Indication
One flashing per 3
seconds
Are all the power on air conditioners turned
ON?
Is the terminal resistance on H-LINK wiring
correctly set?
Is all address for air conditioners configured
correctly?
Isn't H-LINK wiring disconnected?
Isn't H-LINK wiring placed along with power
line?
Does H-LINK wiring meet specification
requirement described in page 9?
Isn't H-LINK LED turned off?
Doesn't H-LINK LED stay lit?
Correctly connect LAN wiring to Central
Station EX.
Also check the fitting for connectors.
Turn the power on HUB ON.
Use LAN cable of category 5 or higher
with length of 100m or shorter.
Replace with new ones.
Provide free space of 150mm or longer for
each wiring.
If none of the above applies to the
circumstances and phenomenon described
on the left remains, Central Station EX may
have internal defect.
Contact your dealer or distributor.
Communication is not properly established.
Check the wiring connection for air
conditioning units and H-LINK.
00E
Turn ON the power on all air conditioners.
Set only 1 terminal resistance on one
H-LINK wiring.
Set the address for air conditioners
according to manuals for units.
Check the wiring connection for H-LINK.
Provide free space of 150mm or longer for
each wiring.
Use the following cable:
- Recommended Size: 0.75~1.25mm
- Total Length: Max. 1,000m
Check the wiring connection for H-LINK.
Central Station EX may have internal
defect. Contact your dealer or distributor.
Action
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