Mitsubishi Electric PURY-P200 Service Handbook page 5

Do not touch the fins on the heat exchanger with
bare hands: they are sharp and dangerous.
In the event of a refrigerant gas leak, provide
adequate ventilation to the room.
• If leaked refrigerant gas is exposed to a heat source,
noxious gases may form.
With All-Fresh type air conditioners, outdoor air
may be directly blown into the room upon thermo
off. Take this into consideration when installing the
unit.
• Direct exposure to outdoor air may present a health
hazard, and it may also cause food items to
deteriorate.
Do not try to defeat the safety features of the
devices, and do not change the settings.
• Defeating the safety features on the unit such as the
pressure switch and temperature switch or using
parts other than those specified by Mitsubishi
Electric may result in fire or explosion.
Precautions for Handling Units for Use with R410A
Do not use the existing refrigerant piping
• The old refrigerant and refrigerator oil in the existing
piping contain a large amount of chlorine, which will
cause the refrigerator oil in the new unit to
deteriorate.
• R410A is a high-pressure refrigerant, and the use of
the existing piping may result in bursting.
Use refrigerant pipes made of C1220 phosphorus
deoxidized copper categorized under H3000
(Copper and Copper Alloy Seamless Pipes and
Tubes), a standard set by JIS. Keep the inner and
outer surfaces of the pipes clean and free of
contaminants such as sulfur, oxides, dust/dirt,
shaving particles, oils, and moisture.
• Contaminants inside the refrigerant piping will cause
the refrigerant oil to deteriorate.
Warning : Carefully read the labels affixed to the main unit.
When installing the unit in a small room, safeguard
against hypoxia that results from leaked refrigerant
reaching the threshold level.
• Consult the dealer for necessary measures to take.
When relocating the air conditioner, consult the
dealer or a specialist.
• Improper installation may result in water leak,
electric shock, or fire.
After completing the service work, check for a
refrigerant gas leak.
• If leaked gas refrigerant is exposed to a heart
source such as fan heater, stove, and electric grill,
noxious gases may form.
Only use specified parts.
• Have the unit professionally installed.
Improper installation may cause water leak, electric
shock, smoke, or fire.
Caution
Use a vacuum pump with a reverse-flow-check
valve.
• If other types of valves are used, the vacuum pump
oil will flow back into the refrigerant cycle and cause
the refrigerator oil to deteriorate.
Do not use the following tools that have been used
with the conventional refrigerants.Prepare tools
that are for exclusive use with R410A.
(Gauge manifold, charging hose, gas leak detector,
reverse-flow check valve, refrigerant charge base,
vacuum gauge, and refrigerant recovery
equipment.)
• If refrigerant and /or refrigerant oil left on these tools
are mixed in with R410A, or if water is mixed with
R410A, it will cause the refrigerant to deteriorate.
• Since R410A does not contain chlorine, gas-leak
detectors for conventional refrigerators will not work.
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