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[Setup of failed outdoor unit]
(12)When the low-pressure sensor output of the failed outdoor unit falls below 14.5 psi (0.10 MPa), fully close the
balance pipe packed valve, and press SW05 on the interface P.C. board to finish the pump-down operation.
(13)Turn off the power supply to all the outdoor units, and recover the residual refrigerant in the outdoor unit using
a refrigerant recovery device. Be sure to measure the amount of recovered refrigerant. (This is necessary to
determine how much additional refrigerant will be needed after the completion of the repair.)
This is the end of the refrigerant recovery operation.
Set SW01/02/03 of the failed outdoor unit and the outdoor unit for pressure adjustment back to 1/1/1.
Select outdoor unit with lowest unit No.
as outdoor unit for pressure adjustment.
Approx. 10 minutes after system startup,
fully close gas pipe service valve.
Set SW01/02/03 to
1/2/2 to have low-
pressure sensor
output displayed.
[Ps] [###]
While monitoring low-pressure
sensor output, adjust pressure to
around 17 psi (0.12 MPa) by slowly
closing gas pipe service valve.
Wait until low-pressure sensor
outputs of failed outdoor unit and
outdoor unit for pressure
adjustment become almost
identical, and, after letting system
continue operating for while longer,
fully close gas pipe service valve.
Press SW04 to have
low-pressure sensor
output displayed
[Ps] [###]
When low-pressure sensor output of failed
outdoor unit falls below 14.5 psi (0.10 MPa), fully
close balance pipe packed valve.
Press SW05 to finish pump-down operation.
Turn off power supply to all outdoor units at
source, and recover residual refrigerant in
outdoor unit using refrigerant recovery device.
Measure amount of recovered refrigerant.
Unit for pressure adjustment
Failed outdoor unit
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