R410A Tools - Fujitsu AB*A30LBT Service Instruction

6. REFRIGERANT CAUTION -R410A-

6-1. R410A TOOLS

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.
Gauge manifold . . . . . . . . . . . . . . . . . . . . .
The specification of the gauge is different due
to higher pressure.
The size of connection pipe is also different to
prevent mis-use.
Charge hose . . . . . . . . . . . . . . . . . . . . . . .
Since the normal pressure is high, the connection pipe size
is also different.
Refrigerant cylinder
Confirm the refrigerant type before charging. Always
charge liquid-phase refrigerant.
Electronic balance for refrigerant
charging . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic balance is recommended as in the case of
R410A.
Vacuum pump with adapter to prevent
reverse flow . . . . . . . . . . . . . . . . . . . . . . . .
Conventional pump can be used.
Vacuum holder . . . . . . . . . . . . . . . . . . . . .
Conventional pump can be used if adapter for preventing
vacuum pump oil from flowing back is used.
Gas leakage tester . . . . . . . . . . . . . . . . . .
Exclusive for HFC
Refrigerant cleaner . . . . . . . . . . . . . . . . . .
Brown paint as designated by the ARI, USA
Flare tool . . . . . . . . . . . . . . . . . . . . . . . . . .
The shape of flare is different for
high pressure condition.
Torque wrench . . . . . . . . . . . . . . . . . . . .
Refrigerant recovering
equipment (Collector) . . . . . . . . . . . . . .
The type which can be used for any refrigerant is available
Nitrogen cylinder . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . .
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.
(Fig.4-1)
(Fig.4-2)
. . . . . . . . . . . . . . . . .
(Fig.4-3)
(Fig.4-4)
(Fig.4-5)
(Fig.4-6)
(Fig.4-7)
(Fig.4-8)
(Fig.4-9)
(Fig.4-10)
(Fig.4-11)
(Fig.4-12)
(Fig.4-13)
(Fig.4-14)
(Fig.4-15)
(Fig.4-16)
TOOLS AND EQUIPMENT (R410A)
Gas charging
Safety charger Fig.4-13
Electronic charging
scale
Refrigerant cylinder
Fig.4-3
Vacuum control
Vacuum
Valve Fig.4-16
Thermistor vacuum gauge Fig.4-15
Vacuuming
Vacuum pump Fig.4-5 Vacuum holder Fig.4-6
Piping work
Flare tool
Torque wrench
Fig.4-9
Fig.4-10
*
1
Gauge Manifold
High
pressure
gauge
Compond
gauge
Port size
*
2
Charge hose
Normal
pressure
Breaking
pressure
Port size
06-01
Pressure control and
Circuit switching
Gauge manifold
Fig.4-1
Fig.4-4
Charge hose
Fig.4-2
Outdoor unit
Leakage tester Fig.4-7
Cleaner Fig.4-8
Nitrogen Cylinder
Fig.4-12
Collector Fig.4-11
R22, R407C
R410A
-0.1 5.3 -0.1 3.5
Mpa
Mpa
-0.1 1.7
-0.1 3.8
Mpa
Mpa
1/2UNF
7/16UNF
5/16"
1/4"
R22, R407C
R410A
5.1 Mpa
3.4 Mpa
27.4 Mpa
17.2 Mpa
7/16UNF
1/2UNF
Control Valve
Fig.4-14