190
[Setup of header unit]
(8) While monitoring the low-pressure sensor output, adjust the pressure to around 17 psi (0.12 MPa) by slowly
closing the gas pipe service valve.
(9) Compare the manifold gauge pressure of the failed unit with the low-pressure sensor output of the header unit,
and wait until the two pressure readings become almost identical. After letting the system continue operating
for a while longer, fully close the gas pipe service valve of the unit for pressure adjustment.
[Setup of failed outdoor unit]
(10)When the manifold gauge pressure 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 test cooling operation.
(11)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 header unit back to 1/1/1.
Approx. 10 minutes after system startup,
fully close gas pipe service valve.
Select header unit as unit
for pressure adjustment.
Header unit (outdoor
unit selected as such)
Failed outdoor unit
When manifold gauge pressure of failed outdoor unit
falls below 14.5 psi (0.10 MPa), fully close balance
pipe packed valve.
Press SW05 to finish test cooling 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.
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.
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