–
3
4
–
6-6-4. Final Installation Checks
Existing pipe: NO
∗
Use a new pipes.
Clean the pipes or use the new pipes.
Is it possible to operate the existing air conditioner?
Was largely discolored oil or
a large quantity of remains discharged?
(When the oil deteriorates, the color of the
oil changes to muddy and black color.)
∗
After the existing air conditioner
is
operated in cooling
mode
for approx. 30 minutes or longer*, recover the
refrigerant.
∗
For
cleaning
the pipes and recovering oil
ë Refrigerant recovery: Pump down method
∗
Remove the existing air conditioner from the piping and
carry out flashing (nitrogen pressure 0.5 Mpa) to remove
the remains inside of the pipe.
Connect the indoor/outdoor units to the existing pipe.
Use a flare nut attached to the main unit for the
indoor/outdoor units.
(Do not use the flare nut of the existing pipe.)
Re-machine the flare machining size to size for R
32
.
Nitrogen gas pressure 0.5 Mpa
(If there is discharge of remains,
it is judged that there is a large quantity of remains
.
)
Are
there no scratch or dent on the existing pipes?
NO
YES
NO
YES
SVM-13072.indb 37
SVM-13072.indb 37
11/01/13 1:53 PM
11/01/13 1:53 PM
T
est
run
∗
(Airtight test), Vacuum dry, Refrigerant charge,
Gas leak check
NO
YES
FILE NO. SVM-18042
-1
•
•
