9
OCH756
2-4. Choosing the outdoor unit installation location
R32 is heavier than air—as well as other refrigerants—
so tends to accumulate at the base (in the vicinity of the
floor). If R32 accumulates around base, it may reach a
flammable concentration in case room is small. To avoid
ignition, maintaining a safe work environment is required
by ensuring appropriate ventilation. If a refrigerant leak is
confirmed in a room or an area where there is insufficient
ventilation, refrain from using of flames until the work
environment can be improved by ensuring appropriate
ventilation.
Install outdoor units in a place where at least one of the
four sides is open, and in a sufficiently large space with-
out depressions.
OK
OK
OK
Not Acceptable
3
Tools for R32 (The following table shows whether conventional tools can be used or not.)
Tools and materials Use
R32 tools
Can R22 tools be
used?
Can R407C tools
be used?
Can R410A tools
be used?
Gauge manifold
Air purge, refrigerant charge
and operation check
Tool exclusive for R32
Charge hose
Tool exclusive for R32
Gas leak detector Gas leak check
Tool for HFC refrigerant
Refrigerant
recovery equipment Refrigerant recovery
Tool exclusive for R32
Refrigerant cylinder Refrigerant charge
Tool exclusive for R32
Safety charger
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Tool exclusive for R32
Charge valve
Prevent gas from blowing out
when detaching charge hose
Tool exclusive for R32
Vacuum pump
Vacuum drying and air
purge
Tools for other refrigerants
can be used if equipped with
adopter for reverse flow check
(Usable if equipped
with adapter for
reverse flow)
(Usable if equipped
with adapter for
reverse flow)
(Usable if equipped
with adapter for
reverse flow)
Flare tool
Flaring work of piping
Tools for other refrigerants can be
used by adjusting flaring dimension
(Usable by
adjusting flaring
dimension)
(Usable by
adjusting flaring
dimension)
(Usable by
adjusting flaring
dimension)
Bender
Bend the pipes
Tools for other refrigerants can be used
Pipe cutter
Cut the pipes
Tools for other refrigerants can be used
Welder and nitrogen gas cylinder Weld the pipes
Tools for other refrigerants can be used
Refrigerant charging scale Refrigerant charge
Tools for other refrigerants can be used
Vacuum gauge or
thermistor vacuum gauge
and vacuum valve
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and
refrigerant to thermistor vacuum gauge)
Tools for other refrigerants
can be used
Charging cylinder
Refrigerant charge
Tool exclusive for R32
─
: Prepare a new tool. (Use the new tool as the tool exclusive for R32.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
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