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COMPRESSOR BACKUP
Header outdoor unit backup operation setting
(failure of header outdoor unit)
Work Procedure
(1) Turn off the power supply to all the units connected to the system at the source.
[Setup of failed header outdoor unit]
(2) Fully close the discharge gas pipe and suction gas pipe service valve of the failed
outdoor unit.
(3) Leave the service valves of the liquid and balance pipes fully open (to prevent
refrigerant stagnation in the failed
outdoor unit).
However, if there is a leakage from an outdoor PMV (unable to close), fully close the
liquid pipe service valve.
(4) <In case of fault in compressor, electrical part, I/F P.C. board, or IPDU P.C. board>
From this point on, keep the power supply to the failed unit off.
<In case of fault in refrigerating circuit or related part (pressure sensor, temperature
sensor, refrigerating cycle part, or fan system part)>
Disconnect the connector [CN03] for outdoor-outdoor communication (BUS2)
provided on the interface P.C. board.
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