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[Setup of outdoor units other than header unit and failed unit]
(8) Leaving the balance pipes of the unit for pressure adjustment and the failed unit fully open, fully close the
balance pipe packed valves of all other outdoor units.
[Setup of header unit]
(9) While monitoring the low-pressure sensor output, adjust the pressure to around 0.12 MPa by slowly closing the
gas pipe service valve.
(10)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]
(11)When the manifold gauge pressure of the failed outdoor unit falls below 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.
(12)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.)
Approx. 10 minutes after system startup,
fully close gas pipe service valve.
Failed outdoor unit
When manifold gauge pressure of failed outdoor unit
falls below 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.
This is the end of the refrigerant recovery operation.
Set SW01/02/03 of the header unit back to 1/1/1.
(6)
Select header unit as unit
for pressure adjustment.
Header unit (outdoor
unit selected as such)
(11)
While monitoring low-pressure sensor
output, adjust pressure to around 0.12 MPa
by slowly closing gas pipe service valve.
Wait until low-pressure sensor outputs of
(12)
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.
(7)
Fully close balance pipes of all other outdoor units
other than unit for pressure adjustment and failed unit.
(9)
(10)
– 246 –
(8)
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Troubleshooting
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