Haier HU062WAMNA Service Manual page 77

Precautions for Handling Units for Use with R32
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.
• R32 is a high-pressure refrigerant, and the use of the
existing piping may result in bursting.
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.
Store the piping to be used during installation indoors,
and keep both ends of the piping sealed until immediately
before brazing.(keep elbows and other joints wrapped in
plastic.)
• If dust, dirt, or water enters the refrigerant cycle, it may
cause the oil in the unit to deteriorate or may cause the
compressor to malfunction.
Use a small amount of ester oil, ether oil, or alkylbenzene
to coat flares and flange connections.
• A large amount of mineral oil will cause the refrigerating
machine oil to deteriorate.
Use liquid refrigerant to charge the system.
• Charge the unit with gas refrigerant will cause the
refrigerant in the cylinder to change its composition and
will lead to a drop in performance
Before Installing the Unit
Do not install the unit in a place where there is a
possibility of flammable gas leak.
• Leaked gas accumulated around the unit may start a
fire or explosion.
Do not use the unit to preserve food, animals, plants,
artifacts, or for other special purposes.
• The unit is not designed to provide adepuate
conditions to preserve the quality of these items.
Do not use the unit in an unusual environment
• The use of the unit in the presence of a large amount
of oil, steam, acid, alkaline solvents or special types of
sprays may lead to a remarkable drop in performance
and/or malfunction and presents a risk of electric
shock, smoke, fire, or explosion.
• The presence of organic solvents, corroded gas (such
as ammonia,sulfur compounds,and acid may cause
gas or water leak.)
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 R32.
(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 R32, or if water is mixed with R32,
it will cause the refrigerant to deteriorate.
• Since R32 does not contain chlorine, gas-leak
detectors for conventional refrigerators will not work.
Do not use a charging cylinder.
• The use of charging cylinder will change the
composition of the refrigerant and lead to power loss.
Exercise special care when handling the tools.
• An introduction of foreign objects such as dust, dirt
or water into the refrigerant cycle will cause the
refrigerating machine oil to deteriorate.
Only use R32 refrigerant.
• The use of refrigerants containing chlorine(i.e. R22)
will cause the refrigerant to deteriorate.
CAUTION
When installing the unit in a hospital, take necessary
measures against noise.
• High-frequency medical equipment may interfere with
the normal operation of the air conditioning unit or
the air conditioning unit may interfere with the normal
operation of the medical equipment
Do not place the unit on or over things that may not get
wet.
• When humidity level exceeds 80% or when the
drainage system is clogged, indoor units may drip
water.
• Installation of a centralized drainage system for
the outdoor unit may also need to be considered to
prevent water drips from the outdoor units.
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