Samsung MXD-K100XN Installation Manual page 35

Outdoor unit display
Communication is off for 2 minutes between AHU-KIT and the outdoor unit during operation.
Explanation
(Ensure room)
Reason Communication error between AHU-KIT and the outdoor or incorrect AHU-KIT number setting
1) Self check
Press the reset KEY(K3) on the
outdoor unit PBA and check the display.
Is there any response
on the display from the AHU-KIT
when tracking?
Disconnect two communication cables from outdoor
unit to AHU-KIT and check the both cables with
oscilloscope.
Are the voltage between the
cables verified as square wave
over DC±0.7? (as shown in the
below graph)
- Check the communication cables between the AHU-
KIT and outdoor/indoor units.
- When there is no error, connect just one AHU-KIT to
check them individually.
- When the error still occurs, change the AHU-KIT PBA
Yes
Yes
Yes
Good
No
Wait for 2 minutes and find the AHU-KIT with the
communication error. Check if the address on PBA is
same with any others.
- Communication error occurs when the address is
assigned to more than one AHU-KIT.
In this case, all the AHU-KIT sharing one address will
show error message.
If the address is correct,
check the communication cable and change the
AHU-KIT PBA
No
Check the communication cable and
the connector on outdoor unit and
change the PBA.
NOTE
• Wired remote controller will show the same
error shown in the outdoor unit.
Bad
English 35