E202 - Samsung MCM-D201N Installation Manual

Trouble shooting
Error on communication between AHU KIT and an outdoor unit after the tracking (During operation)
Outdoor unit display
When the communication between the AHU KIT and an outdoor unit is not available for 2 minutes during operation. (All rooms)
Description
The communication error between AHU KIT and an outdoor unit or the problem with the setting switch for the number of AHU KIT installation.
Reason
1. Checking method
Press the reset key(K3) of outdoor unit PBA and check the
Is there a response from AHU KIT on the display
part during the tracking?
After removing the communication cable which is connected
to AHU KIT from an outdoor unvit, measure the 2 wires on the
outdoor unit with SCOPE.
Is the voltage between 2 wires square wave
that is more than DC±0.7 as shown in the
image below?
− Check the communication cable connection between an
outdoor unit and AHU KIT and between indoor units.
− When there is no problem, check the AHU KIT by
connecting one by one.
− Replace the PBA of AHU KIT with a problem.
• Wired remote controller will display the same error shown in the outdoor unit.
NOTE
+0.7V
-0.7V
36
display part.
No
Yes
Yes
Yes
After 2 minutes, check whether the PBA address setting
is repeated by finding the AHU KIT that displays the
communication error.
− When the AHU KIT address is repeated, communication
error may occur. In this case, the communication error may
occur with all the AHU KITs(more than 2) whose address
setting is incorrectly set.
If there is no problem with the address, check the
communication cable and replace the AHU KIT PBA.
No
After checking the communication cable or the
connector of outdoor unit PBA, replace the PBA.
Good
Bad