Carrier MMY-MAP0724FT9UL Service Manual page 213

[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 push 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
When manifold gauge pressure of failed outdoor unit
falls below 0.10 MPa, fully close balance pipe packed
valve.
Push 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.
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.
(6)
Approx. 10 minutes after system startup,
fully close suction gas pipe service valve.
Failed outdoor unit
(10)
(11)
(7)
Select header unit as unit
for pressure adjustment.
Header unit (outdoor
unit selected as such)
(8)
While monitoring low-pressure sensor
output, adjust pressure to around 0.12 MPa
by slowly closing suction gas pipe service
valve.
(9)
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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