Mitsubishi Electric PUMY-P112VKM [3/39] Safety precautions

Mitsubishi Electric PUMY-P140VKM [3/39] Safety precautions

1. Safety precautions

1.3. Before electric work

Caution:

• Be sure to install circuit breakers. If not installed, electric shock may result.

• For the power lines, use standard cables of sufﬁcient capacity. Otherwise, a

short circuit, overheating, or ﬁre may result.

• When installing the power lines, do not apply tension to the cables. If the

connections are loosened, the cables can snap or break and overheating or

ﬁre may result.

1.4. Before starting the test run

Caution:

• Turn on the main power switch more than 12 hours before starting operation.

Starting operation just after turning on the power switch can severely damage

the internal parts. Keep the main power switch turned on during the operation

season.

• Before starting operation, check that all panels, guards and other protective

parts are correctly installed. Rotating, hot, or high voltage parts can cause

injuries.

• Do not touch any switch with wet hands. Electric shock may result.

• Be sure to ground the unit. Do not connect the ground wire to gas or water

pipes, lighting rods, or telephone grounding lines. If the unit is not properly

grounded, electric shock may result.

• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse), and

molded case circuit breaker) with the speciﬁed capacity. If the circuit breaker

capacity is larger than the speciﬁed capacity, breakdown or ﬁre may result.

• Do not touch the refrigerant pipes with bare hands during operation. The

refrigerant pipes are hot or cold depending on the condition of the ﬂowing

refrigerant. If you touch the pipes, burns or frostbite may result.

• After stopping operation, be sure to wait at least ﬁve minutes before turning off

the main power switch. Otherwise, water leakage or breakdown may result.

1.5. Using R410A refrigerant air conditioners

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. (Refer to

page 6) Note the following if reusing existing pipes that carried R22 refriger-

ant.

- Replace the existing ﬂare nuts and ﬂare the ﬂared sections again.

- Do not use thin pipes. (Refer to page 6)

• 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 dete-

rioration 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 R410A refrigerant. If another refrigerant is

used, the chlorine will cause the oil to deteriorate.

• Use the following tools speciﬁcally designed for use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant. Contact your

nearest dealer for any questions.

Tools (for R410A)

Gauge manifold Flare tool

Charge hose Size adjustment gauge

Gas leak detector Vacuum pump adapter

Torque wrench Electronic refrigerant charging scale

• Be sure to use the correct tools. If dust, debris, or moisture enters the refriger-

ant lines, refrigeration oil deterioration may result.

• Do not use a charging cylinder. If a charging cylinder is used, the composition

of the refrigerant will change and the efﬁciency will be lowered.

1.2. Before installation (relocation)

Caution:

• Be extremely careful when transporting the units. Two or more persons are

needed to handle the unit, as it weighs 20 kg or more. Do not grasp the pack-

aging bands. Wear protective gloves to remove the unit from the packaging

and to move it, as you can injure your hands on the ﬁns or other parts.

• Be sure to safely dispose of the packaging materials. Packaging materials, such

as nails and other metal or wooden parts may cause stabs or other injuries.

• The base and attachments of the outdoor unit must be periodically checked

for looseness, cracks or other damage. If such defects are left uncorrected,

the unit may fall down and cause damage or injuries.

• Do not clean the air conditioner unit with water. Electric shock may result.

• Tighten all ﬂare nuts to speciﬁcation using a torque wrench. If tightened too

much, the ﬂare nut can break after an extended period and refrigerant can

leak out.

1.1. Before installation

Caution:

• 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.

• Do not install the unit where combustible gases may leak, be produced, ﬂow,

or accumulate. If combustible gas accumulates around the unit, ﬁre or explo-

sion may result.

• 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.

Mitsubishi Electric PUMY-P112VKM [3/39] Safety precautions

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