AirStage AO54FJ, Service Manual

Page: 141 / 169

8-1 R410A TOOLS
08-01
Gauge manifold
. . . . . . . . . . . . . . . . . . . . .
(Fig.4-1)
Since the normal pressure is high, the connection pipe size
is also different.
Charge hose
. . . . . . . . . . . . . . . . . . . . . . .
(Fig.4-2)
Refrigerant cylinder
. . . . . . . . . . . . . . . . .
(Fig.4-3)
Confirm the refrigerant type before charging. Always
charge liquid-phase refrigerant.
Electronic balance for refrigerant
charging
. . . . . . . . . . . . . . . . . . . . . . . . . . .
(Fig.4-4)
Electronic balance is recommended as in the case of
R410A.
Vacuum pump with adapter to prevent
reverse flow
. . . . . . . . . . . . . . . . . . . . . . . .
(Fig.4-5)
Conventional pump can be used.
Vacuum holder
. . . . . . . . . . . . . . . . . . . . .
(Fig.4-6)
Conventional pump can be used if adapter for preventing
vacuum pump oil from flowing back is used.
Gas leakage tester
. . . . . . . . . . . . . . . . . .
(Fig.4-7)
Exclusive for HFC
Refrigerant cleaner
. . . . . . . . . . . . . . . . . .
(Fig.4-8)
Brown paint as designated by the ARI, USA
Flare tool
. . . . . . . . . . . . . . . . . . . . . . . . . .
(Fig.4-9)
Torque wrench
. . . . . . . . . . . . . . . . . . . .
(Fig.4-10)
Refrigerant recovering
equipment (Collector)
. . . . . . . . . . . . . .
(Fig.4-11)
The type which can be used for any refrigerant is available
Nitrogen cylinder
. . . . . . . . . . . . . . . . . . .
(Fig.4-12)
This prevents an oxide film from forming in the pipe silver-
alloy brazing work by turning the air out of the pipe and
preventing the inside combustion.
Safety charger
. . . . . . . . . . . . . . . . . . . . .
(Fig.4-13)
It is always compulsory to change the liquid, because
R410A is a mixed refrigerant and there is some fear that a
mixing ratio changes. In order to avoid the refrigerant from
returning to the compressor in a liquid state, the refrigerant
can be charged instead of giving a load to the compressor
with a safety charger.
Control valve
. . . . . . . . . . . . . . . . . . . . . .
(Fig.4-14)
The control valve prevents the refrigerant from spouting
when it is removed, as the charging hose side and the ser-
vice port side are possible to open and close at the same
time.
Thermistor vacuum gauge
. . . . . . . . . . .
(Fig.4-15)
To remove moisture from the refrigerating cycle complete-
ly, it is necessary to perform appropriate vacuum drying.
For that reason, vacuum conditions can be confirmed cer-
tainly.
Vacuum valve
. . . . . . . . . . . . . . . . . . . . .
(Fig.4-16)
This valve builts in a check valve, and it is easily possible
to vacuum a refrigerating cycle or check for degree of vac-
uum with it.
TOOLS AND EQUIPMENT (R410A)
Gauge Manifold
R410A
R22, R407C
High
pressure
gauge
Compond
gauge
Port size
-0.1 5.3
Mpa
-0.1 3.8
Mpa
1/2UNF
5/16"
-0.1 3.5
Mpa
-0.1 1.7
Mpa
7/16UNF
1/4"
*
1
Charge hose
R410A
R22, R407C
Normal
pressure
Port size
5.1 Mpa
27.4 Mpa
1/2UNF
3.4 Mpa
17.2 Mpa
7/16UNF
*
2
Breaking
pressure
This air conditioner used R410A.
For installation and servicing, it is necessary to prepare the
tools and machines that are different from the previous
refrigerant.
Mark shows the exclusive use for R410A.
The specification of the gauge is different due
to higher pressure.
The size of connection pipe is also different to
prevent misuse.
The shape of flare is different for
high pressure condition.
On both 12.7 and 15.88mm flare nut
the size of the nut is made bigger.
Gas charging
Vacuuming
Piping work
Pressure control and
Circuit switching
Charge hose
Fig.4-2
Outdoor unit
Electronic charging
scale Fig.4-4
Vacuum pump Fig.4-5
Thermistor vacuum gauge Fig.4-15
Vacuum
Valve Fig.4-16
Safety charger Fig.4-13
Control Valve
Fig.4-14
Vacuum holder Fig.4-6
Leakage tester Fig.4-7
Cleaner Fig.4-8
Collector Fig.4-11
Nitrogen Cylinder
Fig.4-12
Torque wrench
Fig.4-10
Flare tool
Fig.4-9
Gauge manifold
Fig.4-1
Fig.4-3
Refrigerant cylinder
Vacuum control
Lo
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H
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