Precautions For Devices That Use R410A Refrigerant; Before Getting Started - Mitsubishi Electric CITY MULTI PVFY-P08 NAMU-E1 Manuel D'installation

• After completing installation work, make sure that
refrigerant gas is not leaking.
− If the refrigerant gas leaks and is exposed to a fan heater,
stove, oven, or other heat source, it may generate noxious
gases.
• Children should not be allowed around the air
conditioning equipment.
• The installer and system specialist shall ensure there is
no refrigerant leakage according to local regulations and
standards.
• Pay special attention to the location the unit is installed
in. Refrigerant is heavier than air so locations such
as basements or crawlspaces where refrigerant can
accumulate can become dangerous.
• The appliance is intended for use by persons (including
children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction
concerning use of the appliance by a person responsible
for their safety.
• If the supply cord is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
• Do not use refrigerant other than the type indicated in the
manuals provided with the unit and on the nameplate.
− Doing so may cause the unit or pipes to burst, or result in
explosion of fire during use, during repair, or at the time of
disposal of the unit.
− It may also be in violation of applicable laws.
− MITSUBISHI ELECTRIC CORPORATION cannot be held
responsible for malfunctions or accidents resulting for the
use of the wrong type of refrigerant.
3.2. Precautions for devices that use R410A
refrigerant
Caution:
• Do not use the existing refrigerant piping.
−
The old refrigerant and refrigeration oil in the existing piping
contains a large amount of chlorine which may cause the
refrigerator oil of the new unit to deteriorate.
• Use refrigerant piping made of C1220 (Cu-DHP)
phosphorus deoxidized copper as specified in the JIS
H3300 "Copper and copper alloy seamless pipes and
tubes". In addition, be sure that the inner and outer
surfaces of the pipes are clean and free of hazardous
sulphur, oxides, dust/dirt, shaving particles, oils,
moisture, or any other contaminants.
− Contaminants on the inside of the refrigerant piping may
cause the refrigerant residual oil to deteriorate.
• Store the piping to be used during installation indoors
and keep both ends of the piping sealed until just before
brazing. (Store elbows and other joints in a plastic bag.)
− If dust, dirt, or water enters the refrigerant cycle, deterioration
of the oil and compressor trouble may result.
• Use liquid refrigerant to fill the system.
− If gas refrigerant is used to fill the system, the composition of
the refrigerant in the cylinder will change and performance
may drop.
• Do not use a refrigerant other than R410A.
− If another refrigerant is used, the chlorine in the refrigerant
may cause the refrigerant oil to deteriorate.
• Use a vacuum pump with a reverse flow check valve.
− The vacuum pump oil may flow back into the refrigerant
cycle and cause the refrigerator oil to deteriorate.
Specifications are subject to change without notice.
• Do not use the following tools that are used with
conventional refrigerants.
− (Gauge manifold, charge hose, gas leak detector, reverse
flow check valve, refrigerant charge base, vacuum gauge,
refrigerant recovery equipment).
− If the conventional refrigerant and refrigeration oil are
mixed in the R410A, the refrigerant may deteriorate.
− If water is mixed in the R410A, the refrigeration oil may
deteriorate.
− Since R410A does not contain any chlorine, gas leak
detectors for conventional refrigerant will not react to it.
− Do not use a charging cylinder. May cause the refrigerant
to deteriorate.
• Be especially careful when managing the tools.
− If dust, dirt, or water gets in the refrigeration system, the
refrigerant may deteriorate.

3.3. Before getting started

Caution:
• Do not install the unit where combustible gas may leak.
− If the gas leaks and accumulates around the unit, an
explosion may result.
• Do not use the air conditioner in special environments.
− Oil, steam, sulfuric smoke, etc. can significantly reduce the
performance of the air conditioner or damage its parts
• When installing the unit in a hospital, communication
station, or similar place, provide sufficient protection
against noise.
− The inverter equipment, private power generator, high-
frequency medical equipment, or radio communication
equipment may cause the air conditioner to operate
erroneously, or fail to operate. On the other hand, the air
conditioner may affect such equipment by creating noise
that disturbs medical treatment of image broadcasting.
• Do not install the unit on a structure that may cause
leakage.
− When the room humidity exceeds 80% or when the drain
pipe is clogged, condensation may drip from the indoor
unit. Perform collective drainage work together with the
outdoor unit, as required.
• When the ambient dew point temperature exceeds
75 °F (24 °C), dew condensation may occur on the unit
surface. Perform appropriate treatment to avoid dew
condensation.
5
.
© 2022 Mitsubishi Electric US, Inc.