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(6) Turn on the power supply to all the units connected to the system other than the failed follower unit.
Determine what to do with the power supply to the failed follower unit in the following manner.
<In case of fault in compressor, electrical part, I/F P.C. board, or IPDU P.C. board>
Leave the power supply off.
<In case of fault in refrigerating circuit or related part (pressure sensor, temperature sensor, refrigerating cycle
part, or fan system part)>
Turn on the power supply to protect the compressor (by turning on the case heater).
(When the power supply to the unit is turned on, [E19] (error in the number of outdoor header units) will be
displayed on the 7-segment display. However, this will not cause any problems.)
(7) Perform settings needed to gain permission for backup operation from the header unit (error clearance).
1) Set SW01/02/03 on the interface P.C. board to 1/1/1 and confirm that [U1] [E26] (dropping out of an outdoor
unit) is displayed on the 7-segment display.
2) Set SW01/02/03 on the interface P.C. board to 2/16/1. Upon confirming that [Er] [… … …] is displayed on
the 7-segment display, press SW04 and hold for 5 seconds or more.
3) [Er] [… CL] (error clearance completed) will be displayed on the 7-segment display.
4) Set SW01/02/03 back to 1/1/1. (The display should change to [U1] [– – –].)
This is the end of follower outdoor unit backup operation setting. Check the operation.
(7)
Set SW01/02/03 to 1/1/1
[U1] [E26] will be displayed.
↓
Set SW01/02/03 to [2/16/1].
[Er] [… … …] will be displayed.
↓
Press SW04 and hold for 5 seconds or more
[Er] [… CL] will be displayed.
↓
Set SW01/02/03 back to 1/1/1.
[U1] [– – –] will be displayed.
Interface P.C. board of header unit
Push switch
7-segment display
Rotary switches
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