Mitsubishi Electric PUHZ-W50VHA Service Manual page 7

2-3. CAUTIONS FOR REFRIGERANT PIPING WORK
Tools for R410A (The following table shows whether conventional tools can be used or not.)
Tools and materials
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment Refrigerant recovery
Refrigerant cylinder
Safety charger
Charge valve
Vacuum pump
Bender
Pipe cutter
Welder and nitrogen gas
cylinder
Refrigerant charging scale
Vacuum gauge or thermistor
vacuum gauge and vacuum
valve
Charging cylinder
×
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
Δ
: Tools for other refrigerants can be used under certain conditions.
○
: Tools for other refrigerants can be used.
2-4. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL
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.
OCH439M
Use
Tool exclusive for R410A
Air purge, refrigerant charge
and operation check
Tool exclusive for R410A
Gas leak check Tool for HFC refrigerant
Tool exclusive for R410A
Refrigerant charge Tool exclusive for R410A
Prevent compressor malfunction
Tool exclusive for R410A
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
Tool exclusive for R410A
when detaching charge hose
Tools for other refrigerants
Vacuum drying and air purge can be used if equipped with
adapter for reverse flow check
Bend the pipes Tools for other refrigerants can be used
Cut the pipes Tools for other refrigerants can be used
Weld the pipes Tools for other refrigerants can be used
Refrigerant charge Tools for other refrigerants can be used
Check the degree of vacuum. (Vacuum
Tools for other refrigerants can be used
valve prevents back flow of oil and re-
frigerant to thermistor vacuum gauge)
Refrigerant charge Tool exclusive for R410A
R410A tools
Δ(Usable if equipped
with adapter for
reverse flow)
7
Can R22 tools be
Can R407C tools be used?
used?
×
×
×
×
×
×
×
Δ(Usable if equipped with
adapter for reverse flow)
○
○
○
○
○
×
×
×
○
×
×
×
×
○
○
○
○
○
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