Maintenance - Hitachi PC-ARF Technical Catalogue

7 Gateways for building management systems
HARC-BX E
Check if the transmission cable specified by the
manufacturer has been used to connect to the
air conditioning units.
Check if the transmission cable connected to
the air conditioning is connected to the power
supply cable.
The 7-segment
Check if the termination resistance of the termi-
3 display shows
nal and the number of the transmission cable
"44".
between the air conditioning units is correctly
configured.
Check if the transmission circuit operates nor-
mally with the self-check function.
Check if the air conditioning's power supply is
ON.

7.4.7 Maintenance

The unit should be periodically inspected with the aim of guaranteeing a reliable performance and long-lasting operation.
1 Ambient conditions:
- Make sure that the internal temperature of the housing panel is not too high.
- Make sure that the temperature of the unit housing is not too high.
- Check if there is any dust or fine metal powder and, if so, remove it. Check the lubrication.
2 Displays:
- Check if the run indicator LED of the power supply (PWR) is on.
- Check that the run indicator for the transmission display (H-L, LON) indicates ON/OFF.
- Check if the 7-segment display shows digits other than "00".
3 Assembly and connection parts:
- Check that the screws for the assembly, power supply, transmission cable and all other screws are correctly tight-
ened.
C A U T I O N
Do not use acidic cleaning agents, such as solvents, to clean the units. They could remove the colour from the coating surfaces and melt
the plastic box.
689 689
TCGB0106 rev.0 - 12/2014
Use a shielded cable or twisted and shielded pair cable
(0.75 mm ).
2
Leave a minimum space of 150 mm between cables.
Only one termination resistance should only be config-
ured on one system. (The resistance between cables is
approx. 150 Ω).
The termination resistance should be configured in rela-
tion to the air conditioning transmission cable.
The air conditioning unit should be set to the ON posi-
tion.
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