8
OCH748
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
×
×
〇
Charge hose
Tool exclusive for R32
×
×
〇
Gas leak detector
Gas leak check
Tool for HFC refrigerant
×
〇
〇
Refrigerant recovery equipment
Refrigerant recovery
Tool exclusive for R32
×
×
〇
Refrigerant cylinder
Refrigerant charge
Tool exclusive for R32
×
×
×
Safety charger
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Tool exclusive for R32
×
×
〇
Charge valve
Prevent gas from blowing out
when detaching charge hose
Tool exclusive for R32
×
×
〇
Vacuum pump
Vacuum drying and air purge
Tools for other refrigerants
can be used if equipped with
adapter 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)
Welder and nitrogen gas cylinder
Weld the pipes
Tools for other refrigerants can be used
〇
〇
〇
Refrigerant charging scale Refrigerant charge
Tools for other refrigerants can be used
〇
〇
〇
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
〇
〇
〇
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.
〇
: Tools for other refrigerants can be used.
2-3. PRECAUTIONS WHEN REUSING EXISTING R22/R410a REFRIGERANT TOOLS
Cautions for refrigerant piping work
Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the
performance of the unit.
1. Avoid installing the unit in a location where it will be exposed directly to seawater or sea breeze.
2. If the cover panel may become covered with salt, be sure to install the unit in a location where the salt will be washed away by
rainwater. (If a sunshade is installed, rainwater may not clean the panel.)
3. To ensure that water does not collect in the base of the outdoor unit, make sure that the base is level, not at angle. Water
collecting in the base of the outdoor unit could cause rust.
4. If the unit is installed in a coastal area, clean the unit with water regularly to remove any salt build-up.
5. If the unit is damaged during installation or maintenance, be sure to repair it.
6. Be sure to check the condition of the unit regularly.
7. Be sure to install the unit in a location with good drainage.
2-4. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL
2-5. 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
NG
