Precautions For Devices That Use R32 Refrigerant; Before Installation - Mitsubishi Electric CITY MULTI PUMY-SM112VKM Installation Manual

1.2. Precautions for devices that use R32
refrigerant
Caution:
• Use C1220 copper phosphorus, for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. Make sure the insides of the
pipes are clean and do not contain any harmful contaminants such
as sulfuric compounds, oxidants, debris, or dust. Use pipes with the
specified thickness. Note the following if reusing existing pipes that
carried R22 refrigerant.
- Replace the existing flare nuts and flare the flared sections again.
- Do not use thin pipes.
• Store the pipes to be used during installation indoors and keep both
ends of the pipes sealed until just before brazing. (Leave elbow
joints, etc. in their packaging.) If dust, debris, or moisture enters the
refrigerant lines, oil deterioration or compressor breakdown may
result.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the
refrigeration oil applied to the flared sections. If mineral oil is mixed in
the refrigeration oil, oil deterioration may result.
• Do not use refrigerant other than R32 refrigerant. If another refrigerant
is used, the chlorine will cause the oil to deteriorate.
• Use the following tools specifically designed for use with R32
refrigerant. The following tools are necessary to use R32 refrigerant.
Contact your nearest dealer for any questions.
Tools (for R32)
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
• B e sure to use the correct tools. If dust, debris, or moisture enters the
refrigerant lines, refrigeration oil deterioration may result.
Flare tool
Size adjustment gauge
Vacuum pump adapter
Electronic refrigerant charging scale
1.3. Before installation
Caution:
• Do not install the unit where combustible gases may leak, be
produced, flow, or accumulate. If combustible gas accumulates around
the unit, fire or explosion may result.
• Do not use the air conditioner where food, pets, plants, precision
instruments, or artwork are kept. The quality of the food, etc. may
deteriorate.
• Do not use the unit in an unusual environment. If the air conditioner is
installed in areas exposed to steam, volatile oil (including machine oil),
or sulfuric gas, areas exposed to high salt content such as the seaside,
or areas where the unit will be covered by snow, the performance can
be significantly reduced and the internal parts can be damaged.
• The outdoor unit produces condensation during the heating operation.
Make sure to provide drainage around the outdoor unit if such
condensation is likely to cause damage.
• When installing the unit in a hospital or communications office,
be prepared for noise and electronic interference. Inverters,
home appliances, high-frequency medical equipment, and radio
communications equipment can cause the air conditioner to
malfunction or breakdown. The air conditioner may also affect medical
equipment, disturbing medical care, and communications equipment,
harming the screen display quality.
• Do not install the unit on or over things that are subject to water
damage. 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.
• Follow the instructions below to prevent abrasive components
contained in sandpaper and cutting tools from entering the refrigerant
circuit because those components can cause failures of the
compressor and valves.
- To deburr pipes, use a reamer or other deburring tools, not sandpaper.
- To cut pipes, use a pipe cutter, not a grinder or other tools that use abrasive
materials.
- When cutting or deburring pipes, do not allow cutting chips or other foreign
matters to enter the pipes.
- If cutting chips or other foreign matters enter pipes, wipe them off the inside
of the pipes.
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