AirStage AO54FJ, Service Manual

Page: 144 / 169

8-3 PRECAUTION FOR SERVICING
08-04
Feature 1 Refrigerant oil is different from before.
Refrigerant oil for
New Refrigerant
Synthetic oil
Ether
Esther
Different point from
previous one
Previously it was
mineral oil.
Absorbent character
is high.
Contamination occurs
when mixed withe other
kind of oil.
Use the gauge manifold and charge hose
for New Refrigerant(HFC), which shall
be segregated from those of R22.
Attach the stop valve on the vacuum pump
and avoid the oil from reverse frow.
It is necessary to use the vacuum pump
which can obtain the high vacuum condition.
Precaution on Tools
Feature 2 New Refrigerant has Approx 1.6 times higher pressure than previous refrigerant.
R410A
High Pressure
Different point from
previous one
Diameter of Service port
has been changed from
1/4 Flare to 5/16 Flare.
It requires the gauge manifold and charge
hose exclusively for R410A.
It requires the flare tool and torque wrench
that satisfies New JIS standard.
Precaution on Tools
R410A R22
1.6 times of R22.
JIS standard of flare
process It became lager
To keep thethickness of
copper tube.
(1/4,3/3=more than 0.8mm)
Previous flare tool + flare adapter can be used as well.