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Indoor Unit Power ON Sequence
• Indoor units that are not supplied with power
are in waiting mode continuously.
→System start resets the waiting mode.
• Rebooted if power is supplied halfway
Power ON
<By power supply unit>
<Auto address judgment>
*
Checking group
configuration
Incorrect
Correct
* Correct group configuration means
A No duplication of indoor unit address
B No invalid indoor unit address
C Individual units and header/follower units
are not mixed
D Only one individual unit
E One header and one or more follower units
in a group
System start
<Initial communication>
O/U model identification (10 seconds) (I/U)
Twin header/follower unit identification (I/U)
Group configuration/flap information (R/C)
R/C operation enabled (50 seconds after power on)
<Periodic communication>
Between indoor units (30-second cycle) (Header/follower)
Within same piping (30-second cycle) (Twin main/sub)
(Communication starts as soon as above status changes.)
(Repeated)
3 minutes
passed
Auto address start
(About one minute to end)
<<Notes on trial operation>>
•
Check for normal connections of power
cable, I/U-O/U serial wiring, and group wiring
•
Power ON all indoor units within 3 minutes
•
R/C operation available time (after power on)
1)
When address is correct: Approx. 50 seconds
2)
When auto address is used: Approx. 4-5 minutes
• The indoor unit powered on after auto address judgment under group control is rebooted (system reset), unless it does not
receive data from the header unit or periodic communication within same piping within 120 seconds after power on.
→The sequence restarts from auto address judgment (checking group configuration).
• If the previous address fixed and the header unit is powered on and is rebooted, the refrigerant line address of indoor units
remains unchanged, but the header unit address may change.
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